WO2017009907A1 - モータ制御装置、圧縮機、及び空気調和機 - Google Patents
モータ制御装置、圧縮機、及び空気調和機 Download PDFInfo
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- WO2017009907A1 WO2017009907A1 PCT/JP2015/069948 JP2015069948W WO2017009907A1 WO 2017009907 A1 WO2017009907 A1 WO 2017009907A1 JP 2015069948 W JP2015069948 W JP 2015069948W WO 2017009907 A1 WO2017009907 A1 WO 2017009907A1
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- motor
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- 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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/28—Arrangements for controlling current
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- 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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/15—Controlling commutation time
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- 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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/26—Power factor control [PFC]
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- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
-
- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
Definitions
- the present invention relates to a motor control device, a compressor, and an air conditioner having a function of controlling driving of various motors.
- an inverter circuit that turns on and off a DC voltage output from a rectifier circuit at a predetermined cycle is provided.
- an air conditioner Since the motor of the compressor constituting the air conditioner is focused on high efficiency, the compressor motor is a motor having a rare earth permanent magnet arranged in a rotor structure (hereinafter referred to as a permanent magnet synchronous motor). ) Is often used.
- step-out the load torque of the motor suddenly fluctuates and exceeds the torque that can be output by the motor, and is out of synchronization (hereinafter referred to as step-out).
- step-out the load torque of the motor suddenly fluctuates and exceeds the torque that can be output by the motor, and is out of synchronization
- the present invention has been made against the background of the above-described problems.
- a motor control device, a compressor, and an air conditioner that can continue operation while avoiding step-out when the load torque of the motor increases. The purpose is to get a chance.
- a motor control device is a motor control device that controls a motor, and includes a load torque detection unit that detects a load torque of the motor, and a current that flows through the motor based on detection information of the load torque detection unit.
- Current correction means for controlling the current, and the current correction means increases the current flowing through the motor as the load torque detected by the load torque detection means increases.
- a compressor according to the present invention includes the motor controlled by the motor control device of the present invention.
- the air conditioner according to the present invention includes the compressor according to the present invention, current detection means for detecting a current of the motor, and the motor control when a current value detected by the current detection means is equal to or greater than a current reference value. And overcurrent protection means for stopping the apparatus.
- the current correction means increases the current flowing through the motor as the load torque detected by the load torque detection means increases. Therefore, the current correction means avoids the step-out when the motor load torque increases. Can continue.
- FIG. 1 is a conceptual diagram showing a circuit configuration and a control block diagram of an air conditioner 100 and a motor control device 200 according to Embodiment 1 of the present invention.
- FIG. 2 is a vector diagram constituting magnetic flux vector control of motor control apparatus 200 according to Embodiment 1 of the present invention.
- an air conditioner 100 includes a smoothing capacitor 10, an inverter circuit 11, a current detection unit 13, a gate drive circuit 14, an overcurrent protection unit 15, and a compressor 29 having a motor 30.
- the air conditioner 100 obtains a DC input voltage to the inverter circuit 11 by AC-DC converting the voltage of the AC power source from AC power to DC power using a diode bridge circuit or the like.
- the smoothing capacitor 10 smoothes the pulsation of the voltage when rectified.
- the inverter circuit 11 converts the DC voltage smoothed by the smoothing capacitor 10 into an AC voltage and drives the motor 30.
- the inverter circuit 11 includes a switching element 12 made of a semiconductor such as an IGBT (Insulated Gate Bipolar Transistor), and a return diode element for flowing a reverse current (reflux current) when the switching element 12 is turned off. , And 6 each.
- the switching element 12 of the inverter circuit 11 is composed of, for example, a silicon carbide element, a gallium nitride-based element, or a diamond element.
- the output wiring of the inverter circuit 11 is connected to the motor 30, and the current detection means 13 is provided on the output wiring of the inverter circuit 11.
- the current detection means 13 detects, for example, all phases of the three-phase current flowing through the motor 30 and outputs a voltage or current signal corresponding to the current flowing through the output wiring of the inverter circuit 11.
- the current detection means 13 is composed of, for example, a current sensor that detects the current of the motor 30.
- the instantaneous current value of the motor 30 detected by the current detection means 13 is digitally converted by a microcomputer or the like and taken in.
- the current detecting means 13 detects the two-phase current flowing through the motor 30 and adds the instantaneous value of the detected two-phase current and adds the sum to ⁇ 1 to calculate the remaining one-phase current. Good. Further, the current detection means 13 may be one that detects a magnetic flux corresponding to a flowing current and converts it into a voltage as long as it generally includes a Hall element or the like.
- the overcurrent protection unit 15 temporarily stops the operation of the air conditioner 100 when the current value detected by the current detection unit 13 exceeds a predetermined current reference value, and protects the inverter circuit 11. It has a function.
- the motor 30 is formed of a permanent magnet synchronous motor, a phenomenon called demagnetization that weakens the permanent magnet magnetic flux of the rotor occurs when a current exceeding a certain level flows in the stator winding.
- the motor 30 is configured by a permanent magnet synchronous motor, the loss of the inverter circuit 11 at the IGBT increases when a current exceeding a certain level flows through the stator winding.
- the current reference value is determined according to the demagnetization level of the motor 30 from the viewpoint of suppressing the phenomenon called demagnetization described above, for example. Moreover, the said current reference value is determined from a viewpoint which suppresses that the loss in IGBT of the inverter circuit 11 becomes large, for example.
- the overcurrent protection unit 15 temporarily stops the operation of the air conditioner 100 when the smaller one of the two current reference values is exceeded.
- the overcurrent protection means 15 is configured by hardware using an electronic circuit or the like, or configured by means for protecting the software by performing a digital conversion process by inputting a current detection signal to a microcomputer or the like.
- the overcurrent protection means 15 is configured by software overcurrent protection means 15, the threshold value can be freely changed and various arithmetic processes can be performed, so that the degree of freedom in design is expanded.
- the compressor 29 is a variable capacity compressor that compresses the sucked refrigerant and discharges it as a high-temperature and high-pressure refrigerant.
- the compressor 29 includes a motor 30.
- the motor 30 is composed of, for example, a motor (permanent magnet synchronous motor) having a structure in which a permanent magnet is used for a rotor with high energy saving performance.
- the condenser 31 is a heat exchanger that condenses and liquefies the refrigerant discharged from the compressor 29.
- the decompression device 32 decompresses and expands the refrigerant condensed and liquefied in the condenser 31.
- the evaporator 33 evaporates the refrigerant flowing out from the decompression device 32.
- the refrigeration cycle apparatus is configured by sequentially connecting the compressor 29, the condenser 31, the decompression device 32, and the evaporator 33 through refrigerant pipes.
- the motor control device 200 includes a coordinate conversion unit 20, a rotation speed command generation unit 21, an integration unit 22, a ⁇ -axis current command table 23, a frequency compensation unit 24, and a voltage command calculation.
- Means 25, load torque detecting means 26, current correcting means 27, and inverse coordinate converting means 28 are provided.
- the motor control device 200 controls the gate drive circuit 14 so as to control the motor 30 at a desired rotational speed based on the current value detected by the current detection means 13.
- a voltage is applied between the gate and emitter terminals of the IGBT based on the signal output from the gate drive circuit 14, the collector and emitter of the IGBT are conducted, and the voltage is applied to the motor 30.
- the motor control device 200 detects the magnetic pole phase of the permanent magnet using a magnetic flux sensor or the like, and controls the current based on the magnetic pole phase.
- the air conditioner 100 can perform position sensorless control without using a position sensor.
- a position sensorless control method for a permanent magnet synchronous motor a magnetic flux vector control method for controlling an output voltage so as to keep a primary magnetic flux generated by a motor constant on a predetermined axis will be described below. To do.
- the coordinate conversion means 20 converts the three-phase alternating current flowing in the motor 30 detected by the current detection means 13 into direct current based on the phase ⁇ synchronized with the motor rotation speed.
- the coordinate conversion means 20 outputs, based on the phase ⁇ , an excitation component current I ⁇ that generates magnetic flux generated by the motor 30 and a torque component current I ⁇ that is orthogonal to the excitation component current I ⁇ and contributes to the torque component of the motor 30.
- the ⁇ - ⁇ axes used in this magnetic flux vector control are changed to the dq axes.
- a control axis is generated at a position shifted by ⁇ .
- Rotational speed command generation means 21 calculates the rotational speed command value of the motor 30 so that the air conditioner 100 obtains a desired refrigeration capacity. Further, the rotation speed command generation means 21 performs calculation so that the rotation speed of the motor 30 is increased in a state where more refrigeration capacity is required, for example, in a cooling operation in a high temperature outside air state.
- the rotation speed command generation means 21 is constituted by, for example, a microcomputer.
- the rotational speed command generation means 21 may control each actuator such as the rotational speed of the fan motor, the throttle opening of the decompression device 32 as well as the rotational speed of the motor 30.
- N represents the number of rotations of the motor per minute, and its unit is [min ⁇ 1 ].
- f is the voltage frequency applied to the motor, that is, the frequency [Hz] of the three-phase AC voltage generated by the inverter circuit 11 in the first embodiment.
- p is the number of magnetic poles of the motor 30 (hereinafter referred to as the number of poles).
- the rotational speed of the motor is proportional to the frequency of the inverter output voltage, and the rotational speed of the motor is inversely proportional to the number of poles. From this, it can be seen that the rotational speed of the motor can be controlled by controlling the frequency of the inverter output voltage.
- the motor control device 200 controls the inverter circuit 11 so as to generate a voltage frequency proportional to the rotation speed command value generated by the rotation speed command generation means 21.
- the phase ⁇ synchronized with the rotational speed of the motor 30 can be obtained by time-integrating the electrical angular velocity calculated from the command value of the rotational speed command generating means 21 described above. Is mentioned.
- the final phase ⁇ can be obtained so that the motor 30 can be rotated more stably by using the frequency compensation means 24 described later.
- the frequency compensation means 24 plays a role of compensating the angular velocity ⁇ so that the phase can be stably followed even when the load torque fluctuates with respect to the above-described rotation speed command value.
- the frequency compensation means 24 performs a negative feedback operation using a value proportional to the torque component current I ⁇ so that the ⁇ - ⁇ axis that is the control axis matches the actual magnetic pole position and becomes a lagging phase, thereby compensating the frequency. To work. Thereby, step-out can be avoided without losing sight of the magnetic pole position, and the motor 30 can be rotated stably.
- the frequency compensation gain K may be held as a table value by a microcomputer or the like so as to be an optimum value for each operation pattern.
- the torque component current I ⁇ is a coordinate-transformed value.
- a filtering process may be performed so that only a predetermined time constant component is effective.
- the magnetic flux command value ⁇ * of the primary magnetic flux generated in the motor 30 and I ⁇ and I ⁇ obtained by the above-described operation, the resistance component, inductance component, induced voltage constant, and angular velocity ⁇ of the motor 30 are used.
- the magnetic flux error ⁇ err which is the difference between the magnetic flux command value ⁇ * and the calculated primary magnetic flux ⁇ is fed back so that the total magnetic flux generated by the motor 30 becomes a predetermined reference value on the ⁇ axis.
- a new term is added to the motor voltage equation to obtain voltage command values V ⁇ * and V ⁇ * to be generated on the ⁇ - ⁇ axes.
- the resistance component, inductance component, induced voltage constant, and the like of the motor 30 are unique values, they are measured in advance and stored in a microcomputer or the like.
- magnetic flux vector control is performed so as to maintain a predetermined constant magnetic flux on the ⁇ -axis.
- the magnetic flux command value ⁇ * can be driven efficiently by measuring in advance a point at which the motor 30 operates most efficiently and holding it as a table.
- the torque component current I ⁇ is adopted as an input value to be tabulated, and an optimum magnetic flux command value ⁇ * is created and held for each torque component current I ⁇ .
- the rotational speed of the motor 30 may be adopted as an input value to be tabulated, and an optimum magnetic flux command value ⁇ * for the motor 30 may be created and held.
- the calculation based on the magnetic flux command value ⁇ * may be approximated, and the magnetic flux vector control may be configured using I ⁇ as the command value.
- the inverse coordinate conversion unit 28 Based on the voltage command value on the ⁇ - ⁇ axis obtained by the voltage command calculation unit 25, the inverse coordinate conversion unit 28 converts the two-axis DC amount into a three-phase AC amount and converts the three-phase AC voltage command value Vu. *, Vv *, Vw * are obtained.
- the phase ⁇ used in the inverse coordinate conversion means 28 is the same phase ⁇ as that of the coordinate conversion means 20. Since the voltage command values Vu *, Vv *, Vw * are three-phase sine wave voltage signals, they become PWM (Pulse Width Modulation) signals for turning on and off the IGBT elements of the inverter circuit 11.
- the gate drive circuit 14 In order to drive the gate of the IGBT element of the inverter circuit 11, the gate drive circuit 14 amplifies the PWM signal generated from Vu *, Vv *, and Vw * to about ⁇ 15 V and generates a voltage between the gate and emitter of the IGBT. Apply.
- the compressor is rotated at a rotational speed for obtaining a desired refrigeration capacity. 29 can be driven, and the rotational speed of the motor 30 can be controlled without using the magnetic pole position sensor of the permanent magnet synchronous motor.
- the load torque detection means 26 since the torque component current I ⁇ increases as the load torque increases, it can be said that the state of the load torque can be detected by I ⁇ .
- the motor 30 is configured to add a current value to the command value determined by the ⁇ -axis current command table 23, that is, by increasing I ⁇ . Control not to step out.
- the threshold value of I ⁇ is determined so that the current correction means 27 does not operate within the normal operation range of the compressor 29 and the current correction means 27 operates when the load torque increases outside the operation range of the compressor 29. Is done.
- the command value in the ⁇ -axis current command table 23 is not corrected within the normal operating range of the compressor 29. Therefore, it is possible to ensure high-efficiency operation within the normal operation range of the compressor 29 and to continue the operation of the air conditioner 100 so as not to step out only under high load torque conditions such as when the refrigerant is backed up. it can.
- the normal operation range of the compressor 29 indicates, for example, an overload operation in which the load torque of the motor 30 is maximized. Further, the condition outside the operating range of the compressor 29 indicates, for example, a case where the refrigerant is liquid-backed and sucked into the compressor 29.
- the threshold value of I ⁇ may be determined from the amount of change of I ⁇ instead of a constant value. In this way, it is possible to detect the tendency of increase in load torque at an early stage, to detect noise and the like in advance, and to operate the compressor 29 within the normal operation range.
- FIG. 3 is a conceptual diagram showing an example of a threshold setting method for the load torque detecting means 26 of the motor control device 200 according to Embodiment 1 of the present invention.
- the horizontal axis in FIG. 3 defines time, and the vertical axis in FIG. 3 defines torque component current I ⁇ .
- the threshold A is set to a maximum value of I ⁇ in the normal operation range of the compressor 29 or a value exceeding the maximum value.
- the threshold value B is set to a maximum change amount or a value exceeding the maximum change amount of the torque component current I ⁇ generated by the torque ripple of the motor 30 within the normal operation range.
- the values of the threshold A and the threshold B are set, for example, by measuring each value by conducting an actual machine test in advance.
- the difference between the detection values per sampling time detected by the microcomputer or the like is used. Since it is generally known that the torque component current I ⁇ increases as the load torque of the motor 30 increases, the threshold B is set to a value whose change amount is on the + side.
- the current correction means 27 increases the current flowing through the motor 30 as the load torque detected by the load torque detection means 26 increases.
- the current correction unit 27 increases the current command value further from the current command value by the ⁇ -axis current command table 23 when the load torque state outside the normal operation range of the compressor 29 detected by the load torque detection unit 26 is detected. Operate.
- the means for increasing the current command value is performed, for example, by adding a constant current command value determined in advance for each control cycle.
- the current correction unit 27 adds the added current command value. Is controlled to return to the I ⁇ current command value obtained from the original ⁇ -axis current command table 23.
- the motor control device 200 has a ⁇ -axis even in a state where a liquid back state in which liquid refrigerant is sucked into the compressor 29 in a low outside air state or the like occurs and the load torque rapidly increases.
- the current command value By increasing the current command value, the current flowing through the motor 30 is increased, the motor 30 is heated, and the liquid refrigerant in the compressor 29 can be vaporized.
- the motor control device 200 controls the motor 30, based on the load torque detection means 26 that detects the load torque of the motor 30 and the detection information of the load torque detection means 26.
- Current correction means 27 for controlling the current flowing through the motor 30.
- the current correction means 27 increases the current flowing through the motor 30 as the load torque detected by the load torque detection means 26 increases. For this reason, even if the motor lock failure state in the low rotation speed region of the compressor 29 is detected, the load torque detection unit 26 detects the lock state at an early stage and the current correction unit 27 operates to generate a current flowing through the motor 30.
- the ⁇ -axis current is increased, the overcurrent protection means 15 can be operated, and the air conditioner 100 can be safely stopped before the temperature rise of the stator winding exceeds the allowable winding temperature. . Therefore, it is possible to continue the operation while avoiding the step-out when the load torque of the motor 30 increases.
- the magnetic flux vector control has been described as an example of the position sensorless control method of the permanent magnet synchronous motor.
- another position sensorless control method is adopted, and the compressor 29 is operated by the load torque detecting means 26.
- the command value of each current may be corrected. Even in this case, the operation can be continued while avoiding the step-out of the motor 30.
- Embodiment 2 unlike the first embodiment, the load torque detecting means 26 uses not the coordinate-converted I ⁇ but the effective value calculating means 26a, the unbalance calculating means 26b, and the power factor calculating means 26c. It is what I did.
- the air conditioner 100 according to the second embodiment will be described with respect to the configuration and operation different from those of the first embodiment, and the same reference numerals will be used for the same constituent members as the air conditioner 100 of the first embodiment. Shall.
- FIG. 4 is a conceptual diagram showing a circuit configuration and a control block diagram of the air conditioner 100 and the motor control device 200 according to Embodiment 2 of the present invention.
- FIG. 5 is a vector diagram constituting magnetic flux vector control of the motor control device 200 according to Embodiment 2 of the present invention.
- the motor control device 200 includes an effective value calculation unit 26a, an unbalance calculation unit 26b, and a power factor calculation unit 26c.
- the effective value calculation means 26a calculates the effective value (RMS) of each phase current of the motor 30.
- the calculation formula of the effective value is obtained from the result of calculating the square root with respect to the mean square value in one cycle of the alternating current as is well known.
- the average value per cycle of alternating current it may be calculated by approximation from sampling by the control cycle of the microcomputer. If the alternating current is a sine wave, the effective value is the maximum of the instantaneous value. It is known that the value can be calculated by dividing the value by ⁇ square root over (2) ⁇ .
- the peak hold process may be performed on the instantaneous value per cycle, and the current effective value may be obtained from the above formula.
- the unbalance calculating means 26b calculates the unbalance amount by calculating the difference between the effective values of the respective phase currents with respect to the effective current values of the respective phases flowing through the motor 30 calculated by the effective value calculating means 26a. is there.
- An example of the calculation method is shown below.
- ⁇ U ⁇ V Iu (effective value)
- ⁇ V-W Iv (effective value)-Iw (effective value)
- ⁇ W-U Iw (RMS)-Iu (RMS)
- the power factor calculation means 26c calculates the power factor of the motor 30. Based on the instantaneous current value of the motor 30, the unbalance amount of the current effective value of each phase, and the phase difference between the voltage phase and the current, that is, the power factor of the motor 30, the load torque increase of the motor 30 and the state when the motor 30 is locked are determined. To detect.
- the current correction means 27 is a first reference that is predetermined in any one of the differences ⁇ U ⁇ V, ⁇ V ⁇ W, and ⁇ W ⁇ U of the current effective values of the phases calculated by the unbalance calculation means 26b. If the value is larger than the value, it is determined that the load torque of the motor 30 is increased and the motor 30 is in an abnormal state, and the motor 30 is controlled so as to add the ⁇ -axis current command value, thereby causing the motor 30 to step out. To avoid. Generally, the effective current value does not balance in each of the three phases due to the degree of noise and current distortion, and ⁇ U ⁇ V, ⁇ V ⁇ W, and ⁇ W ⁇ U do not become zero even though the motor 30 is normal.
- the first reference value is set to be larger than the difference between the effective values of the respective phase currents in the normal operation range of the motor 30 measured in advance by an actual machine test or the like.
- the threshold value is set so that the abnormality can be detected more reliably by measuring the unbalance amount of the effective current value when the motor 30 is actually locked.
- the current correction unit 27 determines that the load torque of the motor 30 increases and the motor 30 is in an abnormal state.
- the motor 30 is controlled so as to add the ⁇ -axis current command value to avoid the step-out of the motor 30.
- the second reference value is, for example, a value equal to or lower than the minimum value of the power factor value in the normal operation range of the motor 30 measured in advance by an actual machine test or the like.
- the power factor deteriorates when the motor 30 has a lock failure or the like.
- the sudden change in the load torque of the compressor 29 or the motor 30 is more reliably performed. It is possible to detect the failure state.
- the power factor can be obtained from the phase difference between the voltage and current applied to the motor 30.
- the voltage applied to the motor 30 is the vector sum of V ⁇ and V ⁇
- the voltage vector sum and the phase difference ⁇ v from the ⁇ - ⁇ axis may be obtained by a microcomputer or the like.
- the ⁇ -axis and the ⁇ -axis are orthogonal to each other. Therefore, the vector sum of V ⁇ and V ⁇ can be obtained using the three-square theorem, and the phase difference of the voltage vector Can be obtained by equation (6) (FIG. 5).
- the power factor can be obtained as COS ( ⁇ v ⁇ i).
- the current flowing through the motor 30 is controlled based on the unbalance calculation means 26b for calculating the unbalance of the effective current value in each phase of the compressor 29 and the power factor calculation means 26c for calculating the power factor of the motor 30. May be.
- the current correction means 27 is used when the unbalance amount of the current effective value of each phase calculated by the unbalance calculation means 26b is larger than a predetermined first reference value, or by the power factor calculation means 26c.
- the calculated power factor is less than or equal to the second reference value, it is determined that the motor 30 is in an abnormal state, and the motor 30 is controlled so as to add the ⁇ -axis current command value, thereby causing the motor 30 to step out. May be avoided.
- the motor control device 200 determines that the motor 30 has returned to normal rotation when, for example, the start condition of the current correction unit 27 is not satisfied. In the case of more reliably detecting that the motor 30 has returned to normal rotation, for example, the motor control device 200 determines that the motor 30 is operating normally when the calculated value of the effective value calculating means 26a is less than or equal to a predetermined value. Judge that rotation has returned. When the motor 30 returns to normal rotation, the current correction means 27 subtracts the added ⁇ -axis current command value and returns it to the normal current command value.
- the load torque detecting unit 26 includes the effective value calculating unit 26a that calculates the current effective value of the motor 30, and the current between the three phases calculated by the effective value calculating unit 26a. And an unbalance calculating unit 26b for calculating an unbalanced amount of the effective value, and the current correcting unit 27 has a load torque when the unbalanced amount calculated by the unbalanced calculating unit 26b is larger than the first reference value. As the increase, the current flowing through the motor 30 is increased.
- the step-out of the motor 30 is avoided when the load torque of the motor 30 changes suddenly, and even if the motor 30 is in any failure state, the overcurrent protection means 15 is operated quickly by increasing the ⁇ -axis current, The air conditioner 100 can be safely stopped, and the reliability of the device can be ensured.
- the load torque detecting unit 26 further includes the power factor calculating unit 26c that calculates the power factor of the motor 30, and the current correcting unit 27 is calculated by the power factor calculating unit 26c.
- the power factor of the motor 30 is less than or equal to the second reference value, the current flowing through the motor 30 is increased assuming that the load torque has increased. For this reason, the step-out of the motor 30 is avoided when the load torque of the motor 30 changes suddenly, and even if the motor 30 is in any failure state, the overcurrent protection means 15 is operated quickly by increasing the ⁇ -axis current, The air conditioner 100 can be safely stopped, and the reliability of the device can be ensured.
- the load torque detection means 26 is an effective value calculation means 26a for calculating the effective current value of the motor 30, and an effective current value between the three phases calculated by the effective value calculation means 26a.
- An unbalance calculating means 26b for calculating the unbalance amount and a power factor calculating means 26c for calculating the power factor of the motor 30 are further provided, and the current correcting means 27 has a first unbalance amount calculated by the unbalance calculating means 26b.
- the step-out of the motor 30 is avoided when the load torque of the motor 30 changes suddenly, and even if the motor 30 is in any failure state, the overcurrent protection means 15 is operated quickly by increasing the ⁇ -axis current, The air conditioner can be safely stopped, and the reliability of the device can be ensured.
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Abstract
Description
図1は本発明の実施の形態1に係る空気調和機100及びモータ制御装置200の回路構成及び制御ブロック図を示す概念図である。図2は本発明の実施の形態1に係るモータ制御装置200の磁束ベクトル制御を構成するベクトル図である。
[数1]
N[min-1] = 120×f/p ・・・(1)
[数2]
ω = 2×π×f - K×Iδ ・・・(2)
ここで角速度ωは周波数補償手段24によって補償された最終の角速度である。fは圧縮機回転数指令により得られるインバータ出力周波数である。Kはトルク成分電流Iδに対する周波数補償量の比例ゲインである。
[数3]
Iδ変化量= 現在Iδ検出値 - 前回値 ・・・(3)
[数4]
現在Iδ検出値 > 閾値A ・・・(4)
[数5]
Iδ変化量 > 閾値B ・・・(5)
本実施の形態2においては、実施の形態1とは異なり、負荷トルク検知手段26として、座標変換されたIδではなく、実効値算出手段26a、不平衡算出手段26b、力率算出手段26cを用いるようにしたものである。なお、本実施の形態2に係る空気調和機100は、実施の形態1とは異なる構成及び動作について説明し、実施の形態1の空気調和機100と同一の構成部材については同一の符号を用いるものとする。
ΔU-V = Iu(実効値)-Iv(実効値)
ΔV-W = Iv(実効値)-Iw(実効値)
ΔW-U = Iw(実効値)-Iu(実効値)
通常の圧縮機29の運転中であれば図6のように3相の電流実効値はバランスしているため、ΔU-V、ΔV-W、ΔW-Uはほぼ0Aとなる。モータ30がロックした状態等では、各相インダクタンスが不平衡になることでモータ30の三相交流電流が不平衡となる(図7)。また、モータ30とインバータ回路11とを接続する配線、又は固定子巻線等が断線した欠相運転状態においては、各相電流実効値の不平衡量より一層が大きくなる(図8)。
[数6]
θv = Tan-1(Vδ/Vγ) ・・・(6)
[数7]
θi = Tan-1(Iδ/Iγ) ・・・(7)
Claims (11)
- モータを制御するモータ制御装置であって、
前記モータの負荷トルクを検知する負荷トルク検知手段と、
前記負荷トルク検知手段の検知情報に基づいて前記モータに流れる電流を制御する電流補正手段と、を有し、
前記電流補正手段は、
前記負荷トルク検知手段が検知した負荷トルクが増加するほど前記モータに流れる電流を増加させる
モータ制御装置。 - 前記負荷トルク検知手段は、
トルク成分電流の大きさ及びトルク成分電流の変化量の少なくとも何れかに基づいて前記負荷トルクを検知する
請求項1に記載のモータ制御装置。 - 前記モータの総磁束を基準値に保つように制御を行う位置センサレス制御手段を備える
請求項1又は請求項2に記載のモータ制御装置。 - 前記負荷トルク検知手段は、
前記モータの電流実効値を算出する実効値算出手段と、
前記実効値算出手段によって算出される三相間の電流実効値の不平衡量を算出する不平衡算出手段と、をさらに備え、
前記電流補正手段は、
前記不平衡算出手段によって算出される前記不平衡量が第1基準値よりも大きい場合に、前記負荷トルクが増加したものとして前記モータに流れる電流を増加させる
請求項1~3の何れか一項に記載のモータ制御装置。 - 前記負荷トルク検知手段は、
前記モータの力率を算出する力率算出手段をさらに備え、
前記電流補正手段は、
前記力率算出手段によって算出される前記モータの力率が第2基準値以下である場合に、前記負荷トルクが増加したものとして前記モータに流れる電流を増加させる
請求項1~3の何れか一項に記載のモータ制御装置。 - 前記負荷トルク検知手段は、
前記モータの電流実効値を算出する実効値算出手段と、
前記実効値算出手段によって算出される三相間の電流実効値の不平衡量を算出する不平衡算出手段と、
前記モータの力率を算出する力率算出手段と、をさらに備え、
前記電流補正手段は、
前記不平衡算出手段によって算出される前記不平衡量が第1基準値よりも大きい場合又は前記力率算出手段によって算出される前記モータの力率が第2基準値以下である場合に、前記負荷トルクが増加したものとして前記モータに流れる電流を増加させる
請求項1~3の何れか一項に記載のモータ制御装置。 - 請求項1~6の何れか一項に記載のモータ制御装置によって制御される前記モータを備えた
圧縮機。 - 請求項7に記載の圧縮機と、
前記モータの電流を検出する電流検出手段と、
前記電流検出手段によって検出される電流値が電流基準値以上である場合に前記モータ制御装置を停止させる過電流保護手段と、を備えた
空気調和機。 - 請求項7に記載の圧縮機と、
三相交流電源の整流された直流電圧を平滑する平滑コンデンサと、
前記平滑コンデンサにより平滑された直流電圧を交流電圧に変換するインバータ回路と、を備えた
空気調和機。 - 前記インバータ回路のスイッチング素子は、
炭化珪素素子、窒化ガリウム系の素子、又はダイヤモンド素子によって構成される
請求項9に記載の空気調和機。 - 請求項7に記載の圧縮機と、凝縮器と、減圧装置と、蒸発器と、が冷媒配管によって接続されて構成された冷凍サイクル回路を有する
空気調和機。
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| EP15898223.1A EP3322087B1 (en) | 2015-07-10 | 2015-07-10 | Motor control device, compressor, and air conditioner |
| JP2017528018A JP6410939B2 (ja) | 2015-07-10 | 2015-07-10 | モータ制御装置、圧縮機、及び空気調和機 |
| PCT/JP2015/069948 WO2017009907A1 (ja) | 2015-07-10 | 2015-07-10 | モータ制御装置、圧縮機、及び空気調和機 |
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| WO2020031526A1 (ja) * | 2018-08-07 | 2020-02-13 | 日本電産株式会社 | 駆動制御装置、駆動装置およびパワーステアリング装置 |
| CN114977904A (zh) * | 2022-04-29 | 2022-08-30 | 江苏金彭集团有限公司 | 基于负载估计和动态调速的pmsm无传感启动方法 |
| CN115095968A (zh) * | 2022-07-08 | 2022-09-23 | 北京小米移动软件有限公司 | 转矩补偿控制方法、装置和存储介质 |
| CN118920958A (zh) * | 2024-10-10 | 2024-11-08 | 中联重科股份有限公司 | 电缸控制方法、装置、电动作业机械及机器可读存储介质 |
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| WO2024106339A1 (ja) * | 2022-11-15 | 2024-05-23 | 株式会社日立製作所 | 電力変換装置、電力変換回路の制御方法 |
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Also Published As
| Publication number | Publication date |
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| EP3322087A1 (en) | 2018-05-16 |
| EP3322087B1 (en) | 2025-05-21 |
| JPWO2017009907A1 (ja) | 2018-02-22 |
| EP3322087A4 (en) | 2018-07-11 |
| JP6410939B2 (ja) | 2018-10-24 |
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