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WO2019145993A1 - Dispositif de commande de moteurs électriques et unité d'échangeur de chaleur - Google Patents

Dispositif de commande de moteurs électriques et unité d'échangeur de chaleur Download PDF

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Publication number
WO2019145993A1
WO2019145993A1 PCT/JP2018/001933 JP2018001933W WO2019145993A1 WO 2019145993 A1 WO2019145993 A1 WO 2019145993A1 JP 2018001933 W JP2018001933 W JP 2018001933W WO 2019145993 A1 WO2019145993 A1 WO 2019145993A1
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WO
WIPO (PCT)
Prior art keywords
motor
control unit
motors
switch device
control device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/001933
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English (en)
Japanese (ja)
Inventor
俊紀 浅井
真作 楠部
和憲 坂廼邉
康彦 和田
貴彦 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2019567424A priority Critical patent/JP6887529B2/ja
Priority to PCT/JP2018/001933 priority patent/WO2019145993A1/fr
Publication of WO2019145993A1 publication Critical patent/WO2019145993A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another

Definitions

  • the present invention relates to a motor control device and a heat exchanger unit that control the rotation of a motor using a power conversion device including an inverter.
  • an air conditioner has a refrigerant circuit in which a compressor, a heat source side heat exchanger, a pressure reducing device, a load side heat exchanger, and the like are connected by refrigerant piping, and the enclosed refrigerant circulates.
  • the compressor and the heat source side heat exchanger are provided in the outdoor unit, and the load side heat exchanger is provided in the indoor unit.
  • the air conditioner air-conditions the room in which the indoor unit is disposed by circulating the refrigerant in the refrigerant circuit.
  • the outdoor unit and the indoor unit each function as a heat exchanger unit including a heat exchanger.
  • the outdoor unit of the air conditioning apparatus as described above includes a fan for blowing air to the heat source side heat exchanger and a motor control device for driving the fan.
  • the motor control device drives the motor serving as a power source of the fan and rotates the fan to perform heat exchange between the refrigerant and the outside air in the heat source side heat exchanger.
  • the motor control device controls the number of rotations of the fan and adjusts the air volume sucked by the fan.
  • Some air conditioners have an outdoor unit equipped with a plurality of fans in order to increase the amount of air drawn.
  • the outdoor unit on which a plurality of fans are mounted requires a plurality of inverters.
  • a technology for driving a plurality of motors by one power conversion device for example, see Patent Document 1.
  • three motors are connected in parallel to one power conversion device via a switch device.
  • the number of operating fans when controlling the amount of air drawn, the number of operating fans may be switched. For example, the heat exchanger unit reduces the number of operating fans when reducing the amount of air drawn. In addition, the heat exchanger unit becomes unstable in control when the plurality of motors are operated in the low rotation range. Therefore, in the low rotation region, the heat exchanger unit switches to a single-unit operation in which only one electric motor operates so that the plurality of electric motors do not operate.
  • Patent Document 1 when the switch device is turned off in order to switch from a state where a plurality of electric motors are in operation to one operation, a surge voltage is generated in the switch device. When a surge voltage is applied to the switch device, there is a problem that the switch device may be damaged and the life thereof may be reduced.
  • the present invention has been made to solve the above-described problems, and provides a motor control device and a heat exchanger unit that suppress a surge voltage applied to a switch device and suppress damage and life reduction of the switch device.
  • the purpose is
  • the motor control device comprises a power conversion device for supplying electric power and supplying three-phase voltage to a plurality of motors connected in parallel with each other, at least between the power conversion device and the motor excluding one unit.
  • Switch unit that electrically connects or disconnects by on / off operation, and a control unit that controls the operation of the power conversion device and the switch device, and the control unit is in a state where two or more motors are operating. Therefore, when switching to single-unit operation where only the set motor, which is one set motor, operates, the number of rotations of two or more motors being operated is reduced and then the switch device is turned off. is there.
  • the heat exchanger unit when a plurality of motors, a plurality of fans connected to each of the plurality of motors, the above-described motor control device, and two or more motors are operating. And a host control device that transmits a unit switching command to the motor control device when the number of rotations of each of the motors being operated decreases to the reference number of rotations, and the reference number of rotations is two or more motors.
  • the intake air volume by multiple fans at the same time is equal to the maximum value of the intake air volume by multiple fans when only one motor is operating, for each rotational speed of two or more motors
  • the control unit sets the number of rotations of two or more motors being operated when the number switching instruction is transmitted from the host control device, and then turns off the switch device.
  • the rotational speed of the plurality of motors is reduced to reduce the current flowing to the switch device and then the switch device is turned off, the surge voltage applied to the switch device is suppressed to damage the switch device. And it is possible to suppress the decrease in life.
  • Embodiment 1 of this invention It is the schematic which illustrated the structure of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a control block diagram which illustrated the composition of the motor control device in Embodiment 1 of the present invention. It is a figure which shows an example of a structure of the power converter device shown in FIG. It is a flowchart which shows the process by the high-order control apparatus of FIG. It is a flowchart which shows the one part process by the control part of FIG. It is a time chart which shows the one part process by the control part of FIG. It is a flowchart which shows the one part process by the control part of the motor control apparatus which concerns on Embodiment 2 of this invention.
  • FIG. 1 is a schematic view illustrating the configuration of the air conditioning apparatus according to Embodiment 1 of the present invention.
  • the air conditioner 100 has an outdoor unit 40 and an indoor unit 50.
  • the outdoor unit 40 includes a compressor 41, a four-way valve 42, a heat source side heat exchanger 43, a heat source side expansion device 44, and an accumulator 45.
  • the indoor unit 50 has a load side heat exchanger 51. That is, in the air conditioner 100, the compressor 41, the four-way valve 42, the heat source side heat exchanger 43, the heat source side expansion device 44, the load side heat exchanger 51, and the accumulator 45 are connected via the refrigerant pipe 61. Has a circulating refrigerant circuit 60.
  • the outdoor unit 40 is provided with a host control device 46, a motor control device 10, a first motor 21, a second motor 22, a first fan 31, and a second fan 32.
  • the indoor unit 50 is provided with a load-side fan 52, a fan motor 52a, a load-side upper controller 53, and a load-side motor controller 54.
  • the compressor 41 includes, for example, a compressor motor (not shown) driven by an inverter, and sucks and compresses the refrigerant.
  • the four-way valve 42 is connected to the compressor 41 and is controlled by the host controller 46 to switch the refrigerant flow path.
  • the four-way valve 42 becomes a flow path of a solid line in FIG. 1 during the cooling operation in which the heat source side heat exchanger 43 functions as a condenser and the load side heat exchanger 51 functions as an evaporator.
  • the load-side heat exchanger 51 functions as a condenser
  • the heat source-side heat exchanger 43 functions as an evaporator.
  • the heat source side heat exchanger 43 is, for example, a fin and tube type heat exchanger, and exchanges heat between the refrigerant flowing in the refrigerant circuit 60 and the outside air.
  • the heat source side throttling device 44 includes, for example, an electronic expansion valve, and decompresses and expands the refrigerant.
  • the accumulator 45 stores excess refrigerant and suppresses the inflow of liquid refrigerant to the compressor 41.
  • the motor control device 10 controls the heat exchange capacity of the outdoor unit 40 by controlling the rotational speed of each of the first motor 21 and the second motor 22 and the number of operated motors.
  • the first fan 31 and the second fan 32 are attached to the heat source side heat exchanger 43 and blow air to the heat source side heat exchanger 43.
  • the first fan 31 is connected to the first electric motor 21 and rotates using the first electric motor 21 as a power source.
  • the second fan 32 is connected to the second motor 22 and rotates using the second motor 22 as a power source.
  • the rotational speed of the first motor 21 and f 1, the rotational speed of the second electric motor 22 to f 2.
  • the rotational speeds of the respective motors become equal. That is, when the conventional two simultaneous operation, is equal to the rotational speed f 1 of the first electric motor 21 and the rotational speed f 2 of the second electric motor 22. Therefore, let f be the number of rotations of the first electric motor 21 and the second electric motor 22 in the normal two-unit simultaneous operation in which each process of the first embodiment is not performed.
  • the load-side heat exchanger 51 is, for example, a fin-and-tube type heat exchanger, and exchanges heat between the refrigerant flowing through the refrigerant circuit 60 and the indoor air.
  • the first motor 21 and the second motor 22 are driven by an inverter (not shown) provided in the load-side upper controller 53.
  • the load side fan 52 rotates with the fan motor 52 a as a power source, and blows air to the load side heat exchanger 51.
  • the load-side upper control apparatus 53 controls the operation of the load-side fan 52 via the load-side motor control apparatus 54.
  • the load-side motor control device 54 controls the heat exchange capacity of the indoor unit 50 by controlling the number of rotations of the fan motor 52 a.
  • FIG. 2 is a control block diagram illustrating the configuration of the motor control device according to the first embodiment of the present invention.
  • the motor control device 10 drives a plurality of motors connected in parallel to one another.
  • the motor control device 10 includes a control unit 1, a DC power supply 2, a power conversion device 3 for converting a DC voltage into a three-phase voltage, and between the power conversion device 3 and the second motor 22.
  • a switch device 7 which electrically connects or disconnects the on / off operation.
  • the switch device 7 is, for example, a relay, and the first contact portion 7 x connected to one of the three phases of the power conversion device 3 and the other one of the three phases of the power conversion device 3 And a second contact portion 7y connected.
  • first contact portion 7 x is connected to the U phase of the three phases of power conversion device 3 and electrically connects or disconnects the U 2 phase power line of three phase power line 9.
  • the second contact portion 7y is connected to the W phase of the three phases of the power conversion device 3, and electrically connects or disconnects the W2 phase power line of the three phase power line 9.
  • the power conversion device 3 is, for example, an inverter, converts power and supplies three-phase voltages to a plurality of motors connected in parallel to each other.
  • the first electric motor 21 and the second electric motor 22 to be controlled by the motor control device 10 are connected in parallel.
  • the motor control device 10, the first motor 21, the second motor 22, the first fan 31 and the second fan 32 are included in the heat exchanger unit 30.
  • the heat exchanger unit 30 may be the outdoor unit 40 or may be a part of the outdoor unit 40.
  • the first motor 21 and the second motor 22 are, for example, brushless DC motors, and are driven by the power converter 3.
  • a first fan 31 serving as a load is attached to the first motor 21, and a second fan 32 serving as a load is attached to the second motor 22.
  • the first motor 21 is connected to the power converter 3 via the three-phase power line 8.
  • the first electric motor 21 directly connected to the power conversion device 3 is set to an electric motor to be operated. That is, the first motor 21 corresponds to the "setting motor" of the present invention.
  • the second motor 22 is connected to the power conversion device 3 via a three-phase power line 9 branched from the middle of the three-phase power line 8.
  • a switch device 7 is provided between a branch of the three-phase power line 9 with the three-phase power line 8 and the second motor 22.
  • Each of the first motor 21 and the second motor 22 has a rotor (not shown) and a stator (not shown) that generates a rotating magnetic field around the rotor according to the applied three-phase voltage.
  • the brushless DC motor applies a three-phase AC voltage of appropriate phase and frequency to a stator (not shown) according to the position of the rotor to generate a rotating magnetic field around the rotor, and The rotor is rotated at a desired number of rotations using suction and repulsion with the rotor. At that time, it is necessary to detect the position of the rotor.
  • a method of detecting the position of the rotor it is possible to use, for example, a method of detecting by a hall sensor installed in the motor, or a method of calculating by calculation from three-phase current flowing in a known motor.
  • the first embodiment exemplifies a case where the motor control device 10 estimates the position of the rotor by the latter method.
  • the DC power supply 2 is, for example, a rectifier circuit that converts an AC voltage supplied from a single-phase power supply or a three-phase power supply external to the motor control device 10 into a DC voltage and outputs the DC voltage.
  • the power conversion device 3 drives the first electric motor 21 and the second electric motor 22 based on the three-phase voltage command value Vuvw_ref from the control unit 1. That is, the power conversion device 3 performs PWM control by comparing the three-phase voltage command value Vuvw_ref output from the control unit 1 with a carrier wave which is a reference signal not subjected to modulation.
  • the control unit 1 acquires the number of revolutions f 1 of the first motor 21 and the number of revolutions f 2 of the second motor 22 over time.
  • the control unit 1 performs known vector control based on the rotation speed command value ⁇ _ref input from the upper control device 46 and the detected three-phase current Iuvw, and the power conversion device 3 receives the three-phase voltage command value Vuvw_ref. Output. Further, the control unit 1 outputs the switching instruction signal SW to the switch device 7.
  • the switching instruction signal SW instructs, for example, the switching device 7 to switch from the off state to the on state or from the on state to the off state.
  • the switch device 7 receives the switching instruction signal SW from the control unit 1, the second motor 22 is connected to the three-phase power line 8 connecting the power conversion device 3 and the first motor 21 according to the switching instruction signal SW. It connects or disconnects the second motor 22 from the three-phase power line 8. That is, the switch device 7 connects the second motor 22 to the three-phase power line 8 when the first contact portion 7x and the second contact portion 7y are on, and the first contact portion 7x and the second contact The second motor 22 is disconnected from the three-phase power line 8 when the unit 7y is off.
  • the first fan 31 and the second fan 32 are individually connected to the first motor 21 and the second motor 22, respectively. Then, when the switch device 7 is in the off state, the second motor 22 is electrically disconnected from the power conversion device 3. Therefore, even if the second motor 22 is rotated by disturbance torque such as external wind, if the switch device 7 is in the OFF state, the second motor 22 is not connected to the first motor 21. The influence on the first motor 21 of the regenerative current generated by the rotation can be cut off. That is, the second fan 32 in the free running state does not become a load of the first fan 31.
  • control unit 1 When control unit 1 receives the switch command from host controller 46, all the switching element off processes are performed to output an element off signal to each of the six switching elements 4a to 4f constituting power conversion device 3. Run. Each of the six switching elements 4a to 4f is turned off by the element off signal. Then, while keeping the six switching elements 4a to 4f in the off state, the control unit 1 performs the switch device off process of outputting the contact point off signal to the switch device 7. The switch device 7 is turned off by the contact off signal. That is, each of the first contact 7x and the second contact 7y is turned off by the contact OFF signal.
  • the control unit 1 performs a braking process to stop the rotation of the first electric motor 21 by applying a brake to the first electric motor 21 to shift to the subsequent activation process.
  • the first electric motor 21 and the second electric motor 22 can quickly decelerate by quickly consuming the electrical energy generated by the rotation of the first electric motor 21 and the second electric motor 22. That is, the control unit 1 short-circuits the lines of the first electric motor 21 as part of the braking process in order to quickly consume the electric energy of the first electric motor 21.
  • the short circuit between the lines of the first motor 21 is realized, for example, by turning on the switching elements 4a to 4c simultaneously or turning on the switching elements 4d to 4f simultaneously.
  • control unit 1 starts counting when shifting to the brake processing, that is, when the lines of the first electric motor 21 are short-circuited. And control part 1 starts start processing, when count time which is an integrated value of count reaches predetermined brake processing time. The control unit 1 resets the count time when the start process is started.
  • the brake processing time corresponds to the number of rotations f immediately before shifting to all switching element off processing, that is, the initial number of rotations f 0 which is the number of rotations f immediately before turning off all the plurality of switching elements 4a to 4f. It becomes settled. That is, in the first embodiment, all switching element off processing, switch device off processing, and brake processing are performed in advance for each of a plurality of rotation speeds f assuming the initial rotation speed f 0 . At that time, the time data from the start of the braking process until the rotation speed f 1 of the first electric motor 21 becomes 0 [r / min], to obtain a brake processing time.
  • a processing time table in which the plurality of rotational speeds f are associated with the plurality of brake processing times is created and stored in the storage unit 1 a of the control unit 1.
  • a plurality of rotational speeds f and a plurality of brake processing times are associated such that the braking time increases as the rotational speed f increases. Therefore, the control unit 1 can obtain the brake processing time by checking the rotation speed f on the processing time table.
  • the control unit 1 outputs the three-phase voltage command value Vuvw_ref necessary for driving the first electric motor 21 in the forward rotation to the power conversion device 3 as the start-up process.
  • Control unit 1 generates three-phase voltage command value Vuvw_ref based on rotation speed command value ⁇ _ref input from upper controller 46. That is, the first electric motor 21 accelerates according to the rotation speed command value ⁇ _ref. Since the first electric motor 21 of the first embodiment is a brushless DC motor, the control unit 1 synchronizes the magnetic pole positions of the stator and the rotor before outputting the three-phase voltage command value Vuvw_ref. carry out.
  • the control unit 1 can be configured, for example, by an arithmetic device such as a microcomputer and software that cooperates with such an arithmetic device to realize the above-described functions.
  • the control unit 1 may include hardware such as a circuit device that implements part or all of the functions described above.
  • the host control device 46 outputs, to the control unit 1, a rotation number command value ⁇ _ref indicating the rotation number of each of the first electric motor 21 and the second electric motor 22.
  • the host control device 46 includes a storage unit 46 a that stores various types of information.
  • the storage unit 46a stores the number of revolutions serving as a determination reference when switching the number of motors, and stores a reference number of revolutions X1 preset by an actual machine test or the like.
  • the reference rotational speed X1 is a rotational speed serving as a reference when switching from the simultaneous operation of the first motor 21 and the second motor 22 to the single operation of the first motor 21.
  • reference rotational speed X1 is set to rotational speed f when the suction air volume at the time of two-unit simultaneous operation becomes equal to the maximum value of the suction air volume at the time of one-unit operation.
  • the suction air volume is the air volume sucked into the heat exchanger unit 30 by the first fan 31 and the second fan 32.
  • the switching rotation speed is set to, for example, 80% of the maximum value of the rotation speed f of one motor, and can be changed as appropriate.
  • the host control device 46 is configured to obtain the rotational speed f of the first motor 21 and the second motor 22 from the control unit 1. Further, the upper control device 46 reads the reference rotational speed X1 from the storage unit 46a, and determines whether the rotational speed f is equal to or lower than the reference rotational speed X1. Then, if the number of revolutions f is equal to or less than the reference number of revolutions X1, the upper control device 46 transmits a switch command to the control unit 1.
  • the host control device 46 can be configured by an arithmetic device such as a microcomputer and software that cooperates with such an arithmetic device to realize the above functions. Also, the upper control device 46 may include hardware such as a circuit device that implements part or all of the above-described functions.
  • FIG. 3 is a diagram showing an example of the configuration of the power conversion device shown in FIG.
  • the power conversion device 3 includes six switching elements 4 a to 4 f, backflow prevention elements 5 a to 5 f provided in parallel to the switching elements 4 a to 4 f, and three-phase current Iuvw.
  • the current detection unit 6 of Power conversion device 3 performs PWM control of the DC voltage of DC power supply 2 corresponding to the three-phase voltage command value Vuvw_ref received from control unit 1 to convert the DC voltage into a three-phase voltage, to thereby generate first motor 21 and second motor 21.
  • the motor 22 is supplied.
  • the switching elements 4a to 4f are, for example, IGBTs (Insulated Gate Bipolar Transistors).
  • Each of the backflow prevention elements 5a to 5f is, for example, a diode.
  • FIG. 3 shows a configuration including shunt resistors 6 u to 6 w as an example of the current detection unit 6.
  • the shunt resistor 6 u is provided in the U phase of the power conversion device 3
  • the shunt resistor 6 v is provided in the V phase of the power conversion device 3
  • the shunt resistor 6 w is provided in the W phase of the power conversion device 3. That is, in the first embodiment, control unit 1 detects three-phase current Iuvw by the current detection method using shunt resistors 6u to 6w.
  • a three-phase voltage drop dVuvw occurs according to the current value of each phase.
  • the three-phase voltage drop dVuvw includes the voltage drop dVu of the shunt resistor 6u, the voltage drop dVv of the shunt resistor 6v, and the voltage drop dVw of the shunt resistor 6w, and is input to the control unit 1.
  • the control unit 1 AD-converts the three-phase voltage drop dVuvw and multiplies it by an appropriate gain to detect the three-phase current Iuvw flowing in the shunt resistors 6u to 6w.
  • a known current sensor such as ACCT or DCCT is adopted as the current detection unit 6, and the current detection unit 6 directly measures the three-phase current Iuvw to the control unit 1. You may output it.
  • FIG. 4 is a flowchart showing processing by the upper control apparatus of FIG.
  • FIG. 5 is a flowchart showing part of processing by the control unit of FIG.
  • FIG. 6 is a time chart showing a part of processing by the control unit of FIG.
  • the host control device 46 receives the number of revolutions f from the control unit 1 (step S101). Next, the host control device 46 compares the rotation speed f received from the control unit 1 with the reference rotation speed X1 and determines whether the rotation speed f is less than or equal to the reference rotation speed X1 (step S102).
  • step S102 If the number of revolutions f is less than or equal to the reference number of revolutions X1 (step S102 / YES), the host control device 46 transmits a switch instruction of the number to the control unit 1 (step S103). On the other hand, if the number of revolutions f is larger than the reference number of revolutions X1 (step S102 / NO), the host control device 46 returns to the process of step S101.
  • control unit 1 stands by until receiving a number switching instruction from the host control device 46 (step S201 / NO). That is, when the control unit 1 does not receive the number switching instruction from the host control device 46, the control unit 1 does not perform the process related to the number switching of the motor.
  • control unit 1 When the control unit 1 receives a number switching instruction from the host control device 46 (step S201 / YES), the control unit 1 outputs an element off signal to each of the switching elements 4a to 4f. Thus, the switching elements 4a to 4f are turned off (step S202). Next, the control unit 1 outputs a contact point off signal to the switch device 7. As a result, the switch device 7 is turned off (step S203).
  • control unit 1 shorts the lines of the first electric motor 21 to brake the rotation of the first electric motor 21. At that time, the control unit 1 starts counting (step S204). Next, the control unit 1 stands by until the count time becomes equal to or greater than the brake processing time (step S205 / NO). Then, when the count time becomes equal to or longer than the brake processing time, the control unit 1 ends the brake processing, and sends the three-phase voltage command value Vuvw_ref necessary for driving the first electric motor 21 forward to the power converter 3. Output. Thereby, the first electric motor 21 starts driving (step S206).
  • FIG. 6 shows a flow of operation from the transmission of the unit switching command to the execution of the start processing by the first electric motor 21 when two units are simultaneously operated.
  • the abscissa represents the elapsed time
  • the first stage of the ordinate represents the rotational speed of the motor
  • the second stage of the ordinate represents the driving state of the switch device 7. That is, in the first stage, the rotational speed of the first electric motor 21 is represented by a solid line, and the rotational speed of the second electric motor 22 is represented by a broken line.
  • the second stage shows the on / off state of the switch device 7.
  • the period T1 corresponds to the all switching element off process in step S202 in FIG. 5, and the period T2 corresponds to the switch device off process in step S203 in FIG. Further, a period T3 corresponds to the braking process of steps S204 and S205 of FIG. 5, and a period T4 corresponds to the activation process of step S206 of FIG.
  • the operation of the first motor 21 and the second motor 22 and the operation of the switch device 7 will be described for each period corresponding to each process of FIG. 5 with reference to FIG.
  • switch device off process (T2) In the period T2, the first motor 21 and the second motor 22 are in the free run state.
  • the switch device 7 When the contact point off signal is output from the control unit 1 to the switch device 7, the switch device 7 is turned off, and the second motor 22 is electrically disconnected from the power conversion device 3. At this time, the current flowing through the switch device 7 is interrupted by the all switching element off process.
  • the motor control device 10 changes the power conversion device 3 to the second motor 22 by turning off the six switching elements 4 a to 4 f before the switch device 7 is turned off. It is possible to interrupt the flowing current. Then, the current flowing from the power conversion device 3 to the switch device 7 is cut off, so the amount of current change when the switch device 7 is turned off becomes small, and the surge voltage proportional to the current change when the switch device 7 is turned off is also It becomes smaller.
  • the switch device 7 is turned off. Therefore, according to the motor control device 10, when the switch device 7 is turned off, the current flowing through the switch device 7 can be reduced, so that the surge voltage proportional to the amount of change in current can be suppressed low. Therefore, while being able to suppress the failure
  • the motor control device 10 turns off the switch device 7 and electrically disconnects the second motor 22 from the power conversion device 3, and then performs the brake processing. Therefore, it is possible to reduce the current generated at the time of braking as compared with the case where the two motors are simultaneously braked.
  • the number of rotations f 1 of the first electric motor 21 can be swiftly 0 [r / min] in a shorter time than in the case of simultaneously applying braking to two electric motors. Can be. Therefore, the time until the restart can be shortened, and the decrease in heat exchange capacity of the heat exchanger unit 30 due to the first fan 31 not rotating can be alleviated.
  • the control unit 1 may use a graph or the like in which the initial rotation speed f 0 is associated with the brake processing time.
  • the motor control device 10 executes the all switching element off process, the switch device off process, and the brake process in this order. Therefore, since the second electric motor 22 is not braked and can maintain the free run state, the reduction of the heat exchange capacity of the heat exchanger unit 30 can be alleviated.
  • the motor control device 10 of the first embodiment since the surge voltage applied to the switch device 7 can be suppressed to a low level, the damage and the life reduction of the switch device 7 can be suppressed. As a result, the reliability of the motor control device 10 can be improved. In addition, while suppressing the influence on the heat exchange capacity of the heat exchanger unit 30, it is possible to carry out the switching process of the number of operated motors.
  • the reference rotation speed X1 is set to the rotation speed f when the suction air volume in the two-unit simultaneous operation becomes equal to the maximum value of the suction air volume in the one-unit operation. That is, since the reference rotation speed X1 is based on the air volume that can be sucked by one fan, the suction air volume can be maintained at the time of switching to one-unit operation, and heat exchange of the heat exchanger unit 30 is performed. Ability to keep.
  • control unit 1 of the second embodiment receives the number switching instruction from the host control device 46, the control unit 1 executes the all switching element off process, the switch apparatus off process, the estimation process, and the activation process in this order. . That is, the control unit 1 performs estimation processing instead of the brake processing in the first embodiment.
  • control unit 1 estimates the number of rotations f 1 of the first electric motor 21 in the free run state and the position of the rotor of the first electric motor 21, and based on each estimated value. Execute startup processing.
  • the position of the rotor corresponds to the phase of the rotor.
  • storage unit 1a of control unit 1 includes characteristic information indicating characteristics such as inertia of first motor 21, second motor 22, first fan 31, and second fan 32, which will be described later.
  • the rotation speed reduction information is stored.
  • the control unit 1 estimates the number of revolutions f 1 of the first motor 21 and estimates the magnetic pole position of the rotor of the first motor 21 as an initial number of revolutions f 0 , initial position information, and an elapsed time after turning off. It carries out using characteristic information.
  • the initial number of revolutions f 0 is the number of revolutions f immediately before shifting to all switching element off processing.
  • the initial position information is information of the magnetic pole position of the rotor of the first electric motor 21 immediately before shifting to the all switching element off process. That is, the initial position information is information on the magnetic pole position of the rotor of the setting motor immediately before all the switching elements 4a to 4f are turned off.
  • the post-off elapsed time is an elapsed time after all the plurality of switching elements 4a to 4f are turned off, and the control unit 1 counts time.
  • the characteristic information is information indicating characteristics such as inertia of the first motor 21 and the first fan 31.
  • the rotation speed f and the rotation speed f 1 are equal to each other immediately before shifting to the all switching element off processing.
  • the free run rotational speed is the rotational speed of the motor in the free run state
  • the rotational speed f 1 of the first electric motor 21 after the switching elements 4a to 4f are turned off.
  • the rotation speed reduction information is information in which the elapsed time after off is associated with the estimated rotation speed which is an estimated value of the free run rotation speed, and the estimated rotation speed is configured to decrease when the elapsed time after off increases.
  • the rotation speed reduction information it is possible to adopt a reduction information table in which the elapsed time after OFF and the estimated rotation speed are associated, or a graph in which the elapsed time after OFF and the estimated rotation speed are associated.
  • control unit 1 can be estimated by using the initial rotational speed f 0 and off after time, the rotational speed f 1 of the first electric motor 21 that is a free-run state. That is, the control unit 1 can obtain the estimated rotation speed by illuminating the rotation time decrease information corresponding to the initial rotation speed f 0 with the elapsed time after the turn-off.
  • the magnetic pole position of the rotor can be calculated by time integration of the rotational angular velocity of the rotor. That is, the control unit 1 is in the free run state based on the information indicating the relationship between the post-off elapsed time and the free-run rotational speed previously confirmed in the experiment, the post-off elapsed time, and the initial position information
  • the magnetic pole position of the rotor of the first motor 21 can be estimated. That is, the control unit 1 obtains the estimated value of the magnetic pole position of the rotor of the first motor 21 in the free run state as the estimated position information.
  • the control unit 1 uses the estimated rotation number obtained from the rotation number decrease information as the information indicating the relationship between the post-off elapsed time and the free run rotation number.
  • the control unit 1 generates a three-phase voltage command value Vuvw_ref by using the estimated rotation number and estimated position information estimated in the immediately preceding estimation process as the start-up process, and outputs the three-phase voltage command value Vuvw_ref to the power conversion device 3.
  • the power conversion device 3 outputs, to the first electric motor 21, a voltage having a magnitude, frequency, and phase synchronized with the rotor.
  • the first electric motor 21 follows the target rotational speed after the stator and the rotor are synchronized.
  • control unit 1 obtains the estimated rotation speed by referring to the rotation speed decrease information for the elapsed time after the turn-off. Further, the control unit 1 obtains the estimated position information using the calculated estimated number of rotations, the initial position information, and the elapsed time after the OFF. Then, the control unit 1 synchronizes the magnetic pole positions of the rotor and the stator of the setting motor using the estimated position information thus obtained, and restarts the setting motor.
  • FIG. 7 is a flowchart showing a part of processing by the control unit of the motor control device according to Embodiment 2 of the present invention.
  • FIG. 8 is a time chart showing a part of processing by the control unit of the motor control device according to Embodiment 2 of the present invention.
  • control unit 1 executes the processing of steps S201 to S203 as in the case of FIG.
  • control unit 1 the elapsed time after off in timing, by illuminating the rotational speed reducing information corresponding to the initial rotational speed f 0, determine an estimated rotational speed of the first electric motor 21 (step S301). Then, using the relationship between the post-off elapsed time and the free-run rotational speed, the post-off elapsed time, and the initial position information, the control unit 1 estimates the estimated position of the magnetic pole position of the rotor of the first electric motor 21. Information is obtained (step S302).
  • control unit 1 by using the estimated rotational speed and estimated position information, to follow the stator and the rotor of the first electric motor 21 is synchronized, and the rotational speed f 1 of the first electric motor 21 to the target rotational speed Three-phase voltage command value Vuvw_ref is generated. Then, the control unit 1 outputs the generated three-phase voltage command value Vuvw_ref to the power conversion device 3 (step S303).
  • FIG. 8 shows a flow of operation from the transmission of the unit switching command to the execution of the start processing by the first electric motor 21 when two units are simultaneously operated.
  • the basic configuration of the time chart of FIG. 8 is the same as that of the time chart of FIG.
  • a period T1 corresponds to the all switching element off process in step S202 in FIG. 7, and a period T2 corresponds to the switch device off process in step S203 in FIG.
  • a period T5 corresponds to the estimation process of steps S301 and S302 of FIG. 7, and a period T4 corresponds to the activation process of step S303 of FIG.
  • the operations of the first motor 21 and the second motor 22 and the operation of the switch device 7 will be described with reference to FIG. 8, centering on the estimation process.
  • the first motor 21 and the second motor 22 enter a free run state, and their rotational speeds gradually decrease.
  • the switch device 7 is turned off in the period T2
  • the period T5 the estimated rotation number and the estimated position information are obtained.
  • the first motor 21 and the second motor 22 are in the free run state.
  • the first motor 21 is restarted using the estimated rotational speed and the estimated position information obtained by the estimation process of the period T5. Thereafter, the first electric motor 21 accelerates to the target rotational speed.
  • the rotation speed period in the middle of f 1 is decreased T5 and the period T4 of the first electric motor 21, for carrying out the estimation process and startup process, the rotational speed f 1 of the first electric motor 21 It does not decrease to 0 [r / min].
  • the rotational speed f 2 is 0 [r / min in the free running state. ] To decrease.
  • the motor control device 10 performs the rotation speed estimation process and the start process while the rotation speed f 1 of the first motor 21 is decreasing, so that the first fan in the free running state is performed.
  • the first electric motor 21 can be restarted without stopping the rotation of 31. Therefore, the reduction in heat exchange capacity of the heat exchanger unit 30 can be further mitigated.
  • the motor control device 10 since the motor control device 10 does not perform the braking process, the time required for the braking process becomes unnecessary. In addition, since the motor control device 10 does not reduce the number of revolutions f 1 of the first motor 21 to 0 [r / min], the operation of accelerating the first motor 21 from 0 [r / min] becomes unnecessary. . Therefore, the time required for the switching process of the number of operating motors can be shortened.
  • control unit 1 receives the number switching instruction from the host control device 46, the control unit 1 executes the deceleration processing, the current zero cross detection processing, the switch device off processing, and the acceleration processing in this order. That is, the control unit 1 performs deceleration processing and current zero cross detection processing instead of the brake processing in the first embodiment.
  • the deceleration processing is processing in which the control unit 1 decelerates the first electric motor 21 and the second electric motor 22 to the minimum operable rotational speed. That is, the control unit 1 outputs the three-phase voltage command value Vuvw_ref for operating the first motor 21 and the second motor 22 at the lowest operable rotational speed to the power conversion device 3 as the deceleration command.
  • the current flowing through the switch device 7 is an alternating current in which the positive and negative of the current value, which is its value, change periodically. That is, the current zero cross detection process is a process in which the control unit 1 detects the timing at which the current value switches from positive to negative or from negative to positive, that is, the zero cross.
  • the current of each phase detected using the shunt resistors 6u to 6w is in phase with the current flowing to each phase of the switch device 7, respectively. That is, the zero cross of the three-phase current Iuvw detected by the controller 1 using the shunt resistors 6u to 6w matches the zero cross of the current flowing through the switch device 7. Therefore, the control unit 1 of the third embodiment detects the current zero cross which is the zero cross of the three-phase current Iuvw as the current zero cross detection process.
  • the control unit 1 outputs a contact point off signal to the switch device 7 so that the switch device 7 can be turned off at the current zero cross as the switch device off processing.
  • a time lag occurs between when the control unit 1 detects the current zero cross and the switch device 7 is turned off. This is because there is a series of operations in which the control unit 1 outputs an off signal to the switch device 7 and the switch device 7 is turned off after detecting the current zero cross. That is, the control unit 1 can not immediately turn off the switch device 7 when detecting the current zero cross.
  • the control unit 1 in order to more precisely turn off the switch device 7 at the current zero cross, applies a predetermined offset to the timing of the current zero cross to make the switch device 7 contact off signal. Is supposed to be output.
  • the control unit 1 calculates a predetermined offset based on the frequency of the current and the delay time until the switch device 7 is turned off.
  • contact portions are connected to two phases of the U2 phase and the W2 phase. That is, the first contact portion 7x is connected to the U2 phase, and the second contact portion 7y is connected to the W2 phase.
  • the switching instruction signal SW transmitted by the control unit 1 to the switch device 7 is not divided into each phase, and a plurality of phases are collectively managed by the same instruction. Therefore, at the timing when the U2-phase current and the W2-phase current cross the zero, the contact OFF signal as the switching instruction signal SW is transmitted independently to each of the first contact portion 7x and the second contact portion 7y. I can not do it.
  • the control unit 1 alternately switches the trigger for outputting the contact point off signal at the timing at which the U2 phase current crosses zero and the timing at which the W2 phase current crosses zero. ing. That is, the control unit 1 alternately uses the zero cross of the current flowing in the U phase of the power conversion device 3 and the zero cross of the current flowing in the W phase of the power conversion device 3 as the zero cross of the three phase current Iuvw There is. More specifically, when the switch device 7 is turned off at the timing when the current flowing in the U2 phase crosses zero, the control unit 1 switches the switch device at the timing when the current flowing in the W2 phase crosses zero at the time of the next switch device off processing. Turn 7 off.
  • the phase which detects a zero crossing may be replaced, for example, every fixed number of times instead of being replaced every time the switch device is turned off. That is, the control unit 1 may periodically switch the timing of outputting the contact point off signal between the timing at which the U2 phase current crosses zero and the timing at which the W2 phase current crosses zero. In this way, the burden can be distributed between the first contact portion 7 x and the second contact portion 7 y in the switch device 7.
  • the acceleration process is a process of accelerating the first electric motor 21 operating at the lowest operable rotational speed to a target rotational speed. That is, the control unit 1, as an acceleration process to generate a three-phase voltage values Vuvw_ref made to follow the rotational speed f 1 of the first electric motor 21 to the target speed, and outputs to the power converter 3.
  • FIG. 9 is a flowchart showing a part of processing by the control unit of the motor control device according to Embodiment 3 of the present invention.
  • FIG. 10 is a time chart showing a part of processing by the control unit of the motor control device according to Embodiment 3 of the present invention.
  • Control unit 1 decelerates power conversion device 3 so that first motor 21 and second motor 22 can be operated at the minimum number of rotations that can be operated, when the number switching instruction is received from host controller 46 (step S201 / YES).
  • the command is output (step S401).
  • the control unit 1 stands by until the number of revolutions f decreases to the minimum number of revolutions (step S402 / NO).
  • Control part 1 will detect the current zero crossing in three-phase current Iuvw, if number of rotations f falls to the minimum number of rotations (Step S402 / YES) (Step S403). Then, the control unit 1 applies a predetermined offset to the current zero crossing timing, and outputs a contact point off signal to the switch device 7 (step S404). Then, the control unit 1, the rotation speed f 1 of the first electric motor 21 generates the three-phase voltage values Vuvw_ref such that the target rotation speed, and outputs to the power converter 3 (step S405).
  • FIG. 10 shows a flow of operation from the transmission of the unit switching command to the execution of the start processing by the first electric motor 21 when two units are simultaneously operated.
  • the basic configuration of the time chart of FIG. 10 is the same as that of the time charts of FIGS.
  • a period T6 corresponds to the deceleration processing in steps S401 and S402 in FIG. 9, and a period T7 corresponds to the current zero cross detection processing in step S403 in FIG.
  • a period T2 corresponds to the switch device off process in step S404 in FIG. 9, and a period T8 corresponds to the acceleration process in step S405 in FIG.
  • the operation of the first motor 21 and the second motor 22 and the operation of the switch device 7 will be described with reference to FIG.
  • the control unit 1 that has received the number switching instruction from the host controller 46 controls the three-phase voltage of the power conversion device 3 so that the first electric motor 21 and the second electric motor 22 can operate at the lowest rotation speed.
  • the command value Vuvw_ref is output. Therefore, the first electric motor 21 and the second electric motor 22 decelerate to the minimum number of revolutions at the decelerating speed determined as the control constant.
  • the current zero cross detection process in period T7 is performed, and then transition is made to period T2, and the switch device 7 is transitioned to the off state.
  • the switch device 7 is turned off, the second motor 22 is electrically disconnected from the power conversion device 3 and enters a free run state. Therefore, it decelerated as shown in FIG. 10, the rotational speed f 2 of the second electric motor 22 is reduced to 0 [r / min].
  • the first electric motor 21 remains electrically connected to the power conversion device 3, and the operation state up to that point is continued. That is, the first electric motor 21 continues the operation at the lowest rotational speed. And if it transfers to period T8, the 1st electric motor 21 will accelerate to target number of rotations.
  • the timing at which the switch device 7 is turned off is such that the phase used for the determination of the zero crossing is alternated as the next time adopting the current zero crossing of the U2 phase adopts the current zero crossing of the W2 phase. It has become. That is, the control unit 1 switches the phase of the current used as the condition for turning off the switch device 7 every time the switch device 7 is turned off. Therefore, stress can be prevented from continuing to be applied to only the contact portion of the switch device 7 connected to one phase, so that the failure of the switch device 7 can be suppressed and the life can be extended.
  • the surge voltage applied to the switch device 7 can be suppressed to a low level as in the first embodiment, and the damage and the life reduction of the switch device 7 can be suppressed. . Therefore, the highly reliable motor control device 10 can be provided.
  • the highly reliable motor control device 10 can be provided.
  • the motor control device 10 When the motor control device 10 turns off the switch device 7, the motor control device 10 restarts the driving of the first motor 21 without stopping the driving of the first motor 21, and therefore does not stop the rotation of the first fan 31. Therefore, as in the second embodiment, the decrease in heat exchange capacity of the heat exchanger unit 30 can be mitigated.
  • the time required for the braking process is unnecessary, and the acceleration from 0 [r / min] of the first motor 21 is unnecessary, so the process for switching the number of operating motors is required. Time can be shortened.
  • the process of synchronizing the magnetic poles of the rotor and the magnetic poles of the stator in the free run state with the magnetic poles of the stator is unnecessary, the control content can be simplified.
  • the configurations of the air conditioner and the motor control device according to the fourth embodiment are the same as those shown in FIG. 1. Therefore, the same components as those in the first to third embodiments are denoted by the same reference numerals and the description thereof is omitted.
  • the fourth embodiment is characterized in that the control unit 1 performs a current peak detection process instead of the current zero cross detection process in the third embodiment described above.
  • the other control configuration is the same as that of the third embodiment.
  • FIG. 11 is a graph showing waveforms of three-phase alternating current flowing in the motor of the air conditioning apparatus according to Embodiment 4 of the present invention.
  • FIG. 11 illustrates changes over time of the U2-phase current, the V2-phase current, and the W2-phase current.
  • the U2-phase current is indicated by a solid line
  • the V2-phase current is indicated by a broken line
  • the W2-phase current is indicated by an alternate long and short dash line.
  • the current of the V2 phase is the maximum value or the minimum value at the time when the point A is located. Therefore, in the fourth embodiment, a configuration is employed in which the point indicated by point A in FIG. 11 is detected by detecting the peak of the V2 phase current using the above-mentioned current-related relationships of each phase. Have taken
  • control unit 1 is configured to detect a peak or a valley of a sine wave of a V2-phase current not provided with the contact portion, that is, a current peak as the current peak detection process. Then, the control unit 1 outputs a contact point off signal to the switch device 7 so that the switch device 7 can be turned off by the current peak of the V2 phase detected in the current peak detection process as the switch device off process.
  • a time lag occurs from when the control unit 1 detects the current peak of the V2 phase until the switch device 7 is turned off. Therefore, in the fourth embodiment, in order to turn off the switch device 7 more strictly at the current peak of the V2 phase, the control unit 1 applies a predetermined offset to the timing of the current peak of the V2 phase, A contact off signal is output to the switch device 7. The control unit 1 calculates a predetermined offset based on the frequency of the current and the delay time until the switch device 7 is turned off.
  • FIG. 12 is a flowchart showing a part of processing by the control unit of the motor control device according to Embodiment 4 of the present invention.
  • the operation in the case of switching the operating state of the motor from two simultaneous driving to one single driving will be described.
  • the same processes as in FIG. 9 will be assigned the same reference numerals and descriptions thereof will be omitted.
  • the time chart in the fourth embodiment is the same as that in FIG. 10 in the third embodiment, and is thus omitted.
  • the operation of the host control device 46 is the same as that in the case of FIG.
  • the control unit 1 executes the processes of steps S201, S401, and S402 in the same manner as in the case of FIG. Then, when the rotation speed f is reduced to the minimum rotation speed (step S402 / YES), the control unit 1 detects the current peak of the V2 phase in which the contact portion is not provided (step S501). Then, the control unit 1 applies a predetermined offset to the timing of the current peak of the V2 phase, and outputs a contact point off signal to the switch device 7 (step S502). Next, the control unit 1 executes the process of step S405 as in the case of FIG.
  • the motor control device 10 of the fourth embodiment reduces the rotational speed f of the first motor 21 and the second motor 22 to the minimum rotational speed by deceleration processing. Furthermore, the motor control device 10 causes the switch device 7 to be turned off at a timing at which the magnitudes of the U2 phase current and the W2 phase current are not uneven and become as small as possible. Therefore, the surge voltage applied to the switch device 7 can be suppressed low.
  • the current value of the U2 phase and the current value of the W2 phase become equal and relatively small. Therefore, the stress applied to the U2-phase first contact portion 7x and the W2-phase second contact portion 7y can be reduced, and the load can be dispersed between the first contact portion 7x and the second contact portion 7y. Therefore, the failure of the switch device 7 can be suppressed and the life can be extended.
  • the other effects and advantages are the same as in the third embodiment.
  • Embodiment 5 The air conditioning apparatus according to the fifth embodiment differs from the first to fourth embodiments in the configuration of the motor control device. Also, the control content by the host control device is different from the flowchart of FIG. 4. However, since the configuration of the air conditioner is the same as that shown in FIG. 1, the same components as those in the first to fourth embodiments described above will be assigned the same reference numerals and descriptions thereof will be omitted.
  • FIG. 13 is a control block diagram illustrating the configuration of a motor control device according to a fifth embodiment of the present invention.
  • the motor control device 110 of the fifth embodiment is additionally provided with a current detection device 13.
  • the current detection device 13 is, for example, a current sensor, and detects a current flowing through the three-phase power line 8 connecting the first motor 21 and the power conversion device 3.
  • the motor control device 110 has a control unit 101 instead of the control unit 1.
  • the control unit 101 reduces the number of rotations of the two motors being operated below the current number of rotations. And the switch device 7 is turned off.
  • the current difference value Id which is the difference between the current Iuvw1 flowing to the first motor 21 and the current Iuvw2 flowing to the second motor 22.
  • the reference current value X2 Judge from what has become. Then, when the current difference value Id becomes equal to or greater than the reference current value X2, the parallel operation of the first motor 21 and the second motor 22 is switched to the sole operation of only the first motor 21.
  • the current Iuvw1 flowing through the first motor 21 is detected by the current detection device 13.
  • the currents detected by the shunt resistors 6u to 6w shown in FIG. 3 are the sum of the current Iuvw1 flowing to the first motor 21 and the current Iuvw2 flowing to the second motor 22. Therefore, the current Iuvw2 flowing through the second motor 22 can be obtained by subtracting the current Iuvw1 detected by the current detection device 13 from the three-phase current Iuvw detected by the shunt resistors 6u to 6w.
  • control unit 101 acquires the number of revolutions f of the first electric motor 21 and the second electric motor 22, and outputs the rotational speed f to the upper control device 46.
  • the control unit 101 acquires the current Iuvw1 flowing from the current detection device 13 to the first electric motor 21 over time.
  • the control unit 101 also obtains the current Iuvw2 flowing through the second motor 22 by subtracting the current Iuvw1 from the three-phase current Iuvw. Then, the control unit 101 obtains a current difference value Id which is a difference between the current Iuvw1 and the current Iuvw2, and outputs the obtained current difference value Id to the upper control device 46.
  • the other configuration of the control unit 101 is the same as that of the control unit 1 of the first to fourth embodiments.
  • the upper control device 46 compares the rotational speed f received from the control unit 101 with the reference rotational speed X1 as in the above embodiments, and determines the control unit 1 when the rotational speed f is less than or equal to the reference rotational speed X1. In response to this, it sends a unit switching command. Further, the host control device 46 according to the fifth embodiment compares the current difference value Id output from the control unit 101 with the reference current value X2, and also when the current difference value Id is equal to or greater than the reference current value X2. And sends a switch command to the control unit 1.
  • FIG. 14 is a flowchart showing processing by the upper control apparatus of the air conditioning apparatus according to Embodiment 5 of the present invention. Referring to FIG. 14, a control procedure performed by the host control device 46 in connection with the switching of the number of motors will be described. In FIG. 14, the determination condition at the time of transmitting the unit switching instruction is different from that in FIG. 4. The same processes as in FIG. 4 will be assigned the same reference numerals and descriptions thereof will be omitted.
  • the host control device 46 receives the number of revolutions f and the current difference value Id from the control unit 1 (step S601). Next, the host control device 46 determines whether the number of revolutions f is equal to or less than the reference number of revolutions X1. Further, the host controller 46 compares the current difference value Id with the reference current value X2, and determines whether the current difference value Id is equal to or greater than the reference current value X2 (step S602).
  • step S602 / YES If the host controller 46 satisfies the determination condition that the number of revolutions f is equal to or less than the reference number of revolutions X1 or the current difference value Id is equal to or more than the reference current value X2 (step S602 / YES). The command is transmitted (step S103). On the other hand, if the above-described determination condition is not satisfied (step S602 / NO), the host control device 46 returns to the process of step S601.
  • the comparison and determination between the rotational speed f and the reference rotational number X1 and the comparison and determination between the current difference value Id and the reference current value X2 are performed at the same timing.
  • the control device 46 may perform each comparison determination at different timings. Therefore, the timing of receiving the rotation speed f from the control unit 1 and the timing of receiving the current difference value Id from the control unit 1 may be different.
  • control part 101 may output the current Iuvw1 and the current Iuvw2, or the current Iuvw1 and the current Iuvw1 to the higher-level control device 46.
  • the host controller 46 obtains the current difference value Id and then compares it with the reference current value X2.
  • the motor control device 110 can suppress the surge voltage applied to the switch device 7 to a low level, and can suppress the damage and the life reduction of the switch device 7. .
  • the reliability of the motor control device 110 can be improved.
  • the number switching instruction is transmitted from the host control device 46 even when the current difference value Id which is the difference between the current Iuvw1 and the current Iuvw2 is equal to or greater than the reference current value X2. Be done. Therefore, it is possible to switch from parallel operation of the first electric motor 21 and the second electric motor 22 to sole operation of only the first electric motor 21 before the current diverges due to the disturbance phenomenon and the operation continuation of the electric motor becomes difficult. Therefore, the abnormal stop of the 1st electric motor 21 and the 2nd electric motor 22 can be avoided, and rotation of the 1st fan 31 can be continued.
  • control for suppressing the disturbance also exists, but it may be difficult to suppress the disturbance in the low rotation region of the motor, and such control for suppressing the disturbance is effective. May not work.
  • abnormal stop of the motor can be avoided and operation can be continued even in the low rotation region of the motor.
  • the configuration of the fifth embodiment can be applied to each of the first to fourth embodiments.
  • the switch device 7 is provided only between the power conversion device 3 and the second motor 22 is illustrated in FIGS. 1 and 13, the present invention is not limited thereto. It may be provided between the branch of the power line 8 and the three-phase power line 9 and the first electric motor 21. That is, the switch device 7 is provided at least between the power conversion device 3 and the motor except one.
  • the control units 1 and 101 may make the operating time of the first electric motor 21 equal to the operating time of the second electric motor 22.
  • the structure in which two motors were connected to the motor control apparatus 10 or 110 was illustrated in FIG.1, FIG.2, and FIG.13, three units are not limited to this but the motor control apparatus 10 or 110.
  • the above electric motors may be connected.
  • the control units 1 and 101 switch from one in which two or more motors are in operation to one in which only the setting motor is operated, the rotational speeds of the two or more motors being operated are Lower than the number of revolutions of the switch, and then the switch device is turned off.
  • the switch device 7 may be provided between the power conversion device 3 and the motor excluding one, or may be provided in association with each of all the motors. That is, the switch device 7 may be provided between at least the power conversion device 3 and the motor excluding one.
  • the control units 1 and 101 When the switch device 7 is provided in association with each of all the motors, the control units 1 and 101 periodically set, for example, one motor so as to equalize the operating time of all the motors. Change it. That is, the control units 1 and 101 may appropriately change the setting motor based on the load balance of all the motors.
  • the reference rotational speed X1 is equal to the maximum value of the suction air volume when only one motor is operating, with the suction air volumes by the plurality of fans when two or more motors are operating. The number of revolutions of the motor is set.
  • control unit 1 of the third and fourth embodiments performs the zero-crossing of the three-phase current flowing in the electric motors.
  • the switch device 7 is turned off by outputting an off signal to the switch device 7.
  • the example which provided the motor control apparatus 10 or 110 in the outdoor unit 40 was shown in said each embodiment, it is not limited to this.
  • the load side motor control device 54 may have the same function as the motor control device 10 or 110.
  • the motor which drives a fan was illustrated as an electric motor in each said embodiment, the motor in not only this but the embodiment may be a compressor motor etc. which drives a compressor. .
  • the upper control device 46 exemplifies the case where the determination of whether or not the number of revolutions f is equal to or less than the reference number of revolutions X1.
  • the control units 1 and 101 may perform the determination of whether or not X1 or less.
  • the reference rotational speed X1 may be stored in the storage unit 1a. Then, when the rotational speed f of two or more electric motors becomes equal to or less than the reference rotational speed X1, the control units 1 and 101 may switch to one-operation of the setting electric motor.
  • the present invention is not limited thereto.
  • the control unit 101 may determine whether or not the reference current value X2 or more.
  • the reference current value X2 may be stored in the storage unit 1a. Then, when the current difference value Id becomes equal to or greater than the reference current value X2, the control unit 1 may switch to one-unit operation of the setting motor.
  • the host control device 46 or the control units 1 and 101 may control to switch to one set motor operation when the state in which the rotation speed f is less than or equal to the reference rotation speed X1 continues for a fixed time.
  • the host control device 46 or the control unit 101 may perform control to switch to one set motor operation when the state in which the current difference value Id is the reference current value X2 or more continues for a predetermined time.
  • the contact part of the switch apparatus 7 was connected to the U-phase and W phase of the power converter device 3 was illustrated, not only this but the contact part of the switch apparatus 7 is
  • the power converter 3 may be connected to any two of the three phases. That is, the control unit 1 according to the third embodiment causes the zero cross of the current flowing in one of the three phases of the power conversion device 3 as the zero cross of the three phase current Iuvw and the three phases of the power conversion device 3. The zero-crossing of the current flowing to one other phase is periodically replaced and used. Furthermore, when the control unit 1 of the fourth embodiment detects the peak of the current flowing in the remaining one phase to which each contact portion of the three phases of the power conversion device 3 is not connected, the switch device 7 is used. Output an off signal.
  • the configuration of the air conditioning apparatus 100 is not limited to the configuration shown in FIG. 1 in which the outdoor unit and the indoor unit are connected by refrigerant piping, and the air conditioning apparatus 100 includes an outdoor unit such as a chiller and an indoor unit. It may be a combination. Furthermore, even if some of the embodiments are excluded, the above effects may be obtained. In addition, a part of each configuration of each embodiment may be incorporated into another embodiment to configure the motor control device.

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Abstract

L'invention concerne un dispositif de commande de moteurs électriques et une unité d'échangeur de chaleur équipée du dispositif de commande de moteurs électriques. Le dispositif de commande de moteurs électriques comprend : un dispositif de conversion de puissance qui fournit une tension triphasée à une pluralité de moteurs électriques ; un dispositif de commutation qui branche ou débranche électriquement au moins le dispositif de conversion de puissance et tous les moteurs électriques sauf un ; et une unité de commande qui commande les fonctionnements du dispositif de conversion de puissance et du dispositif de commutation. Lors d'une commutation depuis un état dans lequel au moins deux moteurs électriques fonctionnent dans un état à fonctionnement unique dans lequel fonctionne un seul moteur électrique réglé, autrement dit dans lequel un seul moteur a été réglé, l'unité de commande réduit les vitesses de rotation desdits au moins deux moteurs électriques en fonctionnement puis place le dispositif de commutation dans un état d'arrêt.
PCT/JP2018/001933 2018-01-23 2018-01-23 Dispositif de commande de moteurs électriques et unité d'échangeur de chaleur Ceased WO2019145993A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2019567424A JP6887529B2 (ja) 2018-01-23 2018-01-23 電動機制御装置及び熱交換器ユニット
PCT/JP2018/001933 WO2019145993A1 (fr) 2018-01-23 2018-01-23 Dispositif de commande de moteurs électriques et unité d'échangeur de chaleur

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JP2022146992A (ja) * 2021-03-23 2022-10-06 株式会社明電舎 インバータの制御装置および制御方法
WO2024004442A1 (fr) * 2022-06-27 2024-01-04 株式会社デンソー Dispositif d'entraînement et dispositif de commande d'entraînement
JP2024003758A (ja) * 2022-06-27 2024-01-15 株式会社デンソー 駆動装置及び駆動制御装置
WO2024105720A1 (fr) * 2022-11-14 2024-05-23 三菱電機株式会社 Dispositif d'entraînement de moteur, soufflante, dispositif de climatisation et procédé d'entraînement de moteur
WO2024214240A1 (fr) * 2023-04-13 2024-10-17 三菱電機株式会社 Dispositif d'entraînement de moteur, procédé d'entraînement de moteur, et dispositif à cycle de réfrigération

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JPH1172087A (ja) * 1997-07-03 1999-03-16 Kensetsusho Kanto Chiho Kensetsu Kyokucho モータ駆動による回転機械の運転装置およびその運転制御方法
JP2001286175A (ja) * 2000-04-04 2001-10-12 Matsushita Electric Ind Co Ltd モータ駆動装置
JP2007259554A (ja) * 2006-03-22 2007-10-04 Mitsuba Corp ブラシレスモータの駆動装置

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JPH06189596A (ja) * 1992-12-16 1994-07-08 Toshiba Corp 発電電動機の電動冷却ファン制御方法およびその装置
JPH1172087A (ja) * 1997-07-03 1999-03-16 Kensetsusho Kanto Chiho Kensetsu Kyokucho モータ駆動による回転機械の運転装置およびその運転制御方法
JP2001286175A (ja) * 2000-04-04 2001-10-12 Matsushita Electric Ind Co Ltd モータ駆動装置
JP2007259554A (ja) * 2006-03-22 2007-10-04 Mitsuba Corp ブラシレスモータの駆動装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022146992A (ja) * 2021-03-23 2022-10-06 株式会社明電舎 インバータの制御装置および制御方法
JP7631951B2 (ja) 2021-03-23 2025-02-19 株式会社明電舎 インバータの制御装置および制御方法
WO2024004442A1 (fr) * 2022-06-27 2024-01-04 株式会社デンソー Dispositif d'entraînement et dispositif de commande d'entraînement
JP2024003758A (ja) * 2022-06-27 2024-01-15 株式会社デンソー 駆動装置及び駆動制御装置
JP7619389B2 (ja) 2022-06-27 2025-01-22 株式会社デンソー 駆動装置、駆動制御装置及び駆動制御プログラム
WO2024105720A1 (fr) * 2022-11-14 2024-05-23 三菱電機株式会社 Dispositif d'entraînement de moteur, soufflante, dispositif de climatisation et procédé d'entraînement de moteur
WO2024214240A1 (fr) * 2023-04-13 2024-10-17 三菱電機株式会社 Dispositif d'entraînement de moteur, procédé d'entraînement de moteur, et dispositif à cycle de réfrigération

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