KR20090039482A - Electric motor controller of air conditioner - Google Patents

Abstract

The present invention includes a converter having a plurality of converter switching elements, and receiving a three-phase alternating current power source to perform DC power conversion by a switching operation of the converter switching element, and a plurality of inverter switching elements. And an inverter for converting into an AC power source of a predetermined frequency by a switching operation of an inverter switching element and supplying the same to a three-phase electric motor, a converter micom for controlling a switching operation of the converter, and an inverter micom for controlling a switching operation of the inverter. It relates to an electric motor control apparatus of an air conditioner. As a result, the electric motor control device of the air conditioner can cope with power factor control, DC voltage boosting, and harmonic regulation.

Description

Motor controller of air conditioner {Motor controller of air conditioner}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor control apparatus for an air conditioner, and more particularly, to an electric motor control apparatus for an air conditioner capable of coping with power factor control, direct current voltage boosting, and harmonic regulation.

An air conditioner is a device that is disposed in a room, a living room, an office, or a business store to adjust a temperature, humidity, cleanliness, and airflow of an air to maintain a comfortable indoor environment.

Air conditioners are generally divided into one-piece and separate types. The integrated type and the separate type are functionally the same, but the integrated type integrates the functions of cooling and heat dissipation to install a hole in the wall of the house or hang the device on the window, and the separate type installs an indoor unit that performs cooling / heating on the indoor side and outdoor. On the side, an outdoor unit that performs heat dissipation and compression functions was installed, and two separate devices were connected by refrigerant pipes.

On the other hand, the air conditioner is used for the motor, such as a compressor, the motor control device for driving this is used. Conventionally, the motor control apparatus which converts this into DC power using a single phase AC power, and converts it into AC power of a predetermined frequency has been used.

1 is a circuit diagram showing a motor control apparatus of a conventional air conditioner.

Referring to the drawings, the motor control apparatus 100 of a conventional air conditioner removes harmonic components from a three-phase alternating current power through the reactor 105, and uses a modular three-phase bridge diode 110, alternating current power Is rectified by a DC power supply and the voltage rectified by the smoothing capacitor C1 is smoothed. In this way, the rectified and smoothed DC power is supplied, and the inverter 120 converts into a three-phase AC power source having a predetermined frequency by using switching elements provided and diodes connected in anti-parallel to each switching element. Applied three-phase AC power to the three-phase electric motor 150. In addition, the inverter microcomputer 130 may drive the switching elements of the inverter 120 based on the output current i _o detected by the output current detecting means Z for detecting the output current i _o of the inverter output stage. Outputs a switching control signal Sc.

In general, referring to the motor control apparatus as illustrated in FIG. 1, when the DC power is converted from the three-phase AC power, the boosting may not be performed when the DC power is converted due to the use of the three-phase bridge diode 110, thereby limiting the maximum value of the DC voltage. . In addition, by using the reactor 105 between the three-phase AC power source and the three-phase bridge diode 110, power factor correction control is not properly performed, and it is not easy to limit the harmonics generated in the three-phase AC power source or the motor controller. Will not.

An object of the present invention is to provide a power factor by using a converter and an inverter equipped with a switching element in a motor control apparatus of an air conditioner using a three-phase AC power supply, and by using a converter micom and an inverter micom for controlling the converter and the inverter, respectively. The present invention provides a motor controller of an air conditioner capable of controlling and direct voltage boosting and capable of responding to harmonic regulation.

It is another object of the present invention to provide an air conditioner in which any one of the converter micom and the inverter micom applies emergency data to the other micom to stop the operation of the converter and the inverter when the motor controller of the air conditioner is abnormal. It is to provide a motor control device of.

The motor control apparatus for an air conditioner according to an embodiment of the present invention for solving the above-described problems and other problems, the plurality of converter switching elements, and is supplied with a three-phase AC power switching operation of the switching element for the converter A converter for converting DC power by means of a plurality of inverters, a plurality of inverter switching elements, supplied with DC power, and converted to AC power of a predetermined frequency by a switching operation of the inverter switching element, and supplied to a three-phase electric motor; And a converter micom that controls the switching operation of the converter and an inverter micom that controls the switching operation of the inverter.

On the other hand, in the motor control apparatus of the air conditioner according to an embodiment of the present invention, when one of the converter microcomputer and the inverter microcomputer detects an operation abnormality of the converter stage or an operation abnormality of the inverter stage, the microcomputer applies emergency data to the counterpart microcomputer. , Stop the operation of the converter and inverter.

As described above, the motor control apparatus for an air conditioner according to an embodiment of the present invention includes a converter having a switching element to convert three-phase AC power into a DC power source, and an inverter having a switching element to convert a DC power to AC power. And a converter micom for controlling the converter and an inverter micom for controlling the inverter, the power factor control and the DC voltage boosting are possible, and the harmonic regulation can be coped with.

In addition, when an abnormal operation in the motor control device occurs, the circuit element can be protected by sharing emergency data that allows the converter micom and the inverter micom to communicate with each other to stop the operation of the converter and the operation of the inverter.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic diagram of an air conditioner according to the present invention.

Referring to the drawings, the air conditioner 50 is largely divided into an indoor unit (I) and an outdoor unit (O).

The outdoor unit O includes a compressor 2 serving to compress the refrigerant, an electric motor 2b for driving the compressor, an outdoor side heat exchanger 4 serving to radiate the compressed refrigerant, and an outdoor unit. An outdoor blower (5) disposed on one side of the heat exchanger (5) for promoting heat dissipation of the refrigerant, and an outdoor blower (5) for rotating the outdoor fan (5a), and an expansion for expanding the condensed refrigerant. The mechanism 6, the cooling / heating switching valve 10 for changing the flow path of the compressed refrigerant, and the accumulator 3 for temporarily storing the gasified refrigerant to remove moisture and foreign matter and then supplying a refrigerant of a constant pressure to the compressor. And the like.

The indoor unit (I) is disposed inside the indoor heat exchanger (8) performing cooling / heating functions, and the indoor fan (9a) and the indoor disposed at one side of the indoor heat exchanger (8) to promote heat dissipation of the refrigerant. And an indoor blower 9 made of an electric motor 9b for rotating the fan 9a.

At least one indoor side heat exchanger (8) may be installed. The compressor 2 may be at least one of an inverter compressor and a constant speed compressor.

In addition, the air conditioner 50 may be configured as a cooler for cooling the room, or may be configured as a heat pump for cooling or heating the room.

On the other hand, the electric motor in the motor control apparatus of the air conditioner according to an embodiment of the present invention may be each electric motor (2b, 5b, 9b) to operate the outdoor fan, compressor or indoor fan shown in the figure.

3 is a circuit diagram illustrating a motor control apparatus of an air conditioner according to an embodiment of the present invention.

Referring to the drawings, the motor control apparatus 200 of the air conditioner according to an embodiment of the present invention, the reactor 205, converter 210, smoothing capacitor (C11), inverter 220, converter microcomputer 240, the inverter microcomputer 230, and the like. In addition, the motor control apparatus 200 of the air conditioner includes an input current detecting means (A), an input voltage detecting means (B), a dc end voltage detecting means (D), a dc end current detecting means (C), and an output current. Detection means (E) or the like.

The reactor 205 boosts the three-phase AC power and supplies it to the converter 210. Specifically, the AC power is stored in the reactor 205 and supplied to the converter 210 by the on / off operation of the plurality of converter switches provided in the converter 210, thereby performing a boosting operation. On the other hand, the reactor 205 is used for power factor correction of the AC power, and serves to protect the system or converter element by removing harmonics between the three-phase AC power supply and the converter 210.

The converter 210 includes a plurality of converter switching elements, and converts three-phase AC power passed through the reactor 205 into a DC power source by an on / off operation of the switching element. Specifically, the upper arm switching element and the lower arm switching element connected to each other in a pair, a total of three pairs of upper and lower arm switching elements are connected in parallel to each other. Each switching device has a diode in anti-parallel connection. When the switching control signal Scc from the converter micom 240 is input to the gate terminal of each switching element, each switching element performs a switching operation. Thereby, the power factor is controlled, and the three-phase AC power is converted into a DC power and output.

The smoothing capacitor C11 is connected to the output terminal of the converter 210. The converted DC power output from the converter 210 is smoothed. Hereinafter, the output terminal of the converter 210 is referred to as a dc terminal or a dc link terminal. The DC voltage smoothed at the dc stage is applied to the inverter 220.

The inverter 220 includes a plurality of inverter switching elements, and converts the DC power smoothed by the on / off operation of the switching element into a three-phase AC power source having a predetermined frequency and outputs the same. Specifically, the upper arm switching element and the lower arm switching element connected to each other in a pair, a total of three pairs of upper and lower arm switching elements are connected in parallel to each other. Each switching device has a diode in anti-parallel connection. When the switching control signal Sic from the inverter micom 230 is input to the gate terminal of each switching element, each switching element performs a switching operation. As a result, a three-phase AC power supply having a predetermined frequency is output.

Three-phase AC power output from the inverter 220 is applied to each phase of the three-phase electric motor 250. Here, the three-phase electric motor 250 is provided with a stator and a rotor. Each phase AC power of a predetermined frequency is applied to a coil of each stator so that the rotor rotates. The three-phase motor 250 may be a variety of forms, such as BLDC motor, synRM motor. On the other hand, if the three-phase electric motor 250 is classified by function, it may be a compressor electric motor (2b) used in the compressor of the air conditioner, it may be a fan motor (5b, 9b) for driving the fan.

On the other hand, the converter microcomputer 240 outputs the converter switching control signal Scc to the converter 210 in order to control the switching operation of the converter. The switching control signal Scc is a PWM switching control signal and is generated based on the detected dc terminal voltage and output to the converter 210.

On the other hand, the inverter microcomputer 230 outputs the inverter switching control signal (Sic) to the inverter 220 in order to control the switching operation of the inverter. The switching control signal Sic is a PWM switching control signal and is generated based on the detected output current and output to the inverter 230.

As in the embodiment of the present invention, according to the motor control apparatus of the air conditioner for operating the converter and the inverter by using a three-phase AC power source, the converter 210 and the reactor 205 including the switching element for the converter are mutually In conjunction, AC power up, power factor control and harmonic limiting are performed. On the other hand, for the operation of the converter 210, in one embodiment of the present invention, a converter microcomputer 240 for controlling the converter 210 is provided separately.

In addition, the converter microcomputer 240 transmits emergency data id to the inverter microcomputer 230 when the converter abnormality is detected. As a result, the converter microcomputer 240 and the inverter microcomputer 230 share emergency data Ed. The converter stage may be defined as not only the converter 210 but also a three-phase AC power supply to a dc link stage which is an output terminal of the converter 210.

The motor control apparatus 200 of the air conditioner according to the embodiment of the present invention, the input current detecting means (A) for detecting the input current (i _i ) from the commercial AC power supply for detecting the abnormal operation of the converter stage. Include. The input current detecting means A may be located between the three-phase AC power supply and the reactor 205, and a current sensor, a current trnasformer (CT), a shunt resistor, or the like may be used to detect the current. On the other hand, it is possible to detect the input current i _i of two-phase among three-phase alternating current power supplies. Considering three-phase equilibrium, after detecting the current in two phases, the current in the other phase can be predicted.

Input current detection means (A) is the instantaneous, and can detect the input current (i _i), the detected input current (i _i) is applied to the converter microcomputer (240). The converter microcomputer 240 compares the detected input current i _i with a predetermined reference value, and generates emergency data Ed if the detected input current i _i is determined to be overcurrent or low current. This is transmitted to the inverter microcomputer 230. By the emergency data Ed, the converter micom 240 and the inverter micom 230 stop the output of the respective switching control signals Scc and Sic, whereby the converter 210 and the inverter 220 operate. Will stop. In this way, by directly transmitting the abnormal operation of the converter stage to the inverter microcomputer 230, it is possible to protect the circuit elements of the entire motor control device 200 of the air conditioner.

In addition, the motor control apparatus 200 of an air conditioner according to an embodiment of the present invention includes an input voltage detecting means (B) for detecting the input voltage (v _i) from the commercial AC power source. The input voltage detecting means B may be located between the three-phase AC power supply and the reactor 205, and a resistor or the like may be used for detecting the voltage. On the other hand, it is possible to detect the input voltage v _i of two phases among three-phase AC power supplies. Considering three-phase equilibrium, after detecting the voltage of two phases, the voltage of the other one phase can be predicted.

Input voltage detection means (B) are able to detect the instantaneous input voltage (v _i), the detected input voltage (v _i) is applied to the converter microcomputer (240). The converter micom 240 compares the detected input voltage v _i with a predetermined reference value, and generates emergency data Ed if the detected input voltage v _i is determined to be an overvoltage or a low voltage. The inverter transmits to the microcomputer 230. By the emergency data 230, the converter micom 240 and the inverter micom 230 stop the output of the respective switching control signals Scc and Sic, whereby the converter 220 and the inverter 230 operate. Will stop. In this way, by directly transmitting the abnormal operation of the converter stage to the inverter microcomputer 230, it is possible to protect the circuit elements of the entire motor control device 200.

In addition, the motor control apparatus 200 of the air conditioner according to an embodiment of the present invention includes a dc stage voltage detection means (D) for detecting a dc stage voltage (Vdc). As the dc stage voltage detecting means D, a resistor or the like may be used between both ends of the dc stage.

The dc stage voltage detecting unit D may detect a dc stage voltage Vdc on an average, and the detected dc stage voltage Vdc may be applied to the converter microcomputer 240. The converter micom 240 compares the detected dc terminal voltage Vdc with a predetermined reference value, and generates emergency data Ed when the detected dc terminal voltage Vdc is overvoltage or low voltage. The inverter transmits to the microcomputer 230. By the emergency data Ed, the converter micom 240 and the inverter micom 230 stop the output of the respective switching control signals Scc and Sic, whereby the converter 210 and the inverter 220 operate. Will stop. In this way, by directly transmitting the abnormal operation of the converter stage to the inverter microcomputer 230, it is possible to protect the circuit elements of the entire motor control device 200.

In addition, the motor control apparatus 200 of the air conditioner according to the embodiment of the present invention includes a dc stage current detecting means C for detecting the dc stage current I _dc . When defining the dc stage between the first bus and the second bus, the dc stage current detecting means (C) may be located in the second bus and, for current detection, a current sensor, a current transformer (CT), a shunt resistor, or the like. This can be used.

The detected dc terminal current I _dc is a DC current and may be applied to the converter microcomputer 240. The converter micom compares the detected dc terminal current (I _dc ) with a predetermined reference value. When the detected dc terminal current is determined to be overcurrent or low current, the converter micom generates emergency data Ed, and the inverter micom 230 Send to). By the emergency data Ed, the converter micom 240 and the inverter micom 230 stop the output of the respective switching control signals Scc and Sic, whereby the converter 210 and the inverter 220 operate. Will stop. In this way, by directly transmitting the abnormal operation of the converter stage to the inverter microcomputer 230, it is possible to protect the circuit elements of the entire motor control device 200.

On the other hand, the inverter microcomputer 230 transmits emergency data Ed to the converter microcomputer 240 upon detecting an abnormal operation of the inverter stage. As a result, the converter microcomputer 240 and the inverter microcomputer 230 share emergency data Ed. The inverter stage may be defined as the inverter 220 as well as the inverter 220 to the electric motor 250.

The motor control apparatus 200 of the air conditioner according to the embodiment of the present invention detects an output current i _o of the inverter output stage, that is, an output current that detects a current applied to the motor for detecting an abnormal operation of the inverter stage. Means E or F. The output current detecting means E may be located between the inverter 220 and the motor 250, and a current sensor, a current trnasformer (CT), a shunt resistor, or the like may be used to detect the current. In addition, the output current detecting means F may be a current sensor located inside the motor 250. In addition, the output current detecting means E may be a shunt resistor having one end connected to each of the three lower arm switching elements of the inverter. On the other hand, it is possible to detect the output current of two-phase among three-phase AC power supplies. Considering three-phase equilibrium, after detecting the current in two phases, the current in the other phase can be unexpected.

Output current detection means (E or F) can be detected by the instantaneous output current (i _o), the detected output current (i _o) may be applied to the inverter microcomputer (230). The inverter microcomputer 230 compares the detected output current i _o with a predetermined reference value, and generates emergency data Ed if the detected output current i _o is determined to be overcurrent or low current. This is transmitted to the converter microcomputer 240. By this emergency data i _o , the converter micom 240 and the inverter micom 230 stop the output of the respective switching control signals Scc and Sic, whereby the converter 210 and the inverter 220 stop the output. The operation stops. In this way, by directly transmitting the abnormal operation of the inverter stage to the converter microcomputer 240, it is possible to protect the circuit elements of the entire motor control apparatus 200.

4 is a simplified block diagram of a converter microcomputer.

Referring to the drawings, the converter micom 240 calculates d and q-axis current command values i ^* _d and i ^* _q based on the detected dc terminal voltage Vdc and the dc voltage command value V ^* dc. D, q-axis voltage command value (v ^* _d , v) based on the generated current command generation unit 410, d, q-axis current command value (i ^* _d , i ^* _q ) and the detected input current (i _i ) switching to output a switching control signal Scc to drive the switching element for the converter based on the voltage command generation unit 420 for generating ^* _q ) and d, q-axis voltage command values v ^* _d , v ^* _q . The control signal output unit 430 is included.

On the other hand, the current command generation unit 410 generates a PI for generating d, q-axis current command values (i ^* _d , i ^* _q ) based on the detected dc terminal voltage (Vdc) and the dc voltage command value (V ^* dc). The controller (not shown) and the d, q-axis current command value (i ^* _d , i ^* _q ) may each include a d, q-axis current command limiting unit 415 for limiting the level so as not to exceed a predetermined value. .

On the other hand, the voltage command generation unit 420, based on the d, q-axis current command value (i ^* _d , i ^* _q ) and the detected input current (i _i ), the d, q-axis voltage command value (v ^* _d , v ^* _q) PI controller (not shown) and the d, q-axis voltage command value (v to generate a ^* _d, v ^* _q) is d, q-axis voltage command limit, which restricts the level so as not to each greater than a predetermined value unit ( Not shown).

Meanwhile, the converter micom 240 receives each of the detected input current i _i , dc stage current i _dc , input voltage v _i , and dc stage voltage v _dc , and compares them with the respective reference values. The apparatus further includes an abnormality determining unit 440 which determines whether there is an abnormality and outputs emergency data Ed when determining the abnormality. The emergency data Ed is input to the switching control signal output unit 430 in the converter micom 240 and the switching control signal output unit 530 in the inverter micom 230, respectively. Due to the emergency data Ed, the switching control signal output units 430 and 530 in the respective microcomputers no longer output the switching control signals Scc and Sic, so that the converter 210 and the inverter 220 stop the operation. Will stop.

5 is a simplified block diagram of an inverter microcomputer.

Referring to the drawings, the inverter microcomputer 230 includes a speed estimating unit 505 for estimating the rotor speed v of the motor based on the detected output current i _o , an estimated speed v and a command. The current command generator 510 generates a current command value i ^* _d , i ^* _q based on the speed v *, and a current command value i ^* _d , i ^* _q and a detection current i _o . the voltage command values (v ^* _d, v ^* _q) and the voltage command generation section 520 for generating a generated voltage command value (v ^* _d, v ^* _q) switching control signal to the switching element for the inverter on the basis of the basis of And a switching control signal output unit 530 for outputting (Sic).

Meanwhile, the inverter microcomputer 230 further includes an abnormality determining unit 540 which receives the detected output current i _o and compares it with a reference value to determine whether there is an abnormality and outputs emergency data Ed when the abnormality is determined. do. The emergency data Ed is input to the switching control signal output unit 530 in the inverter micom 230 and the switching control signal output unit 430 in the converter micom 240, respectively. Due to the emergency data Ed, the switching control signal output units 430 and 530 in the respective microcomputers no longer output the switching control signals Scc and Sic, so that the converter 210 and the inverter 220 stop the operation. Will stop.

6 is a circuit diagram illustrating a motor control apparatus of an air conditioner according to an embodiment of the present invention.

Referring to the drawings, the motor control apparatus 600 of the air conditioner of Figure 6 is the same as the motor control apparatus 200 of the air conditioner of Figure 3 converter 610, inverter 620, converter micom 640 And an inverter micom 630. Further, the apparatus further includes an input current detecting means A, an input voltage detecting means B, a dc terminal voltage detecting means D, a dc terminal current detecting means C, and an output current detecting means E, F. . However, instead of the reactor 205 of FIG. 3, a common mode LCL filter 605 for removing harmonics is disposed between the commercial AC power supply and the converter 210. The LCL filter 605 includes first inductors La, Lb and Lc connected to respective phases of a commercial AC power supply, second inductors Laa, Lbb and Lcc connected to the converter 610, and one end thereof. The capacitors Ca, Cb, and Cc connected between the first inductor and the second inductor and the other end thereof are connected to the common contact N. The capacitors Ca, Cb, and Cc are connected in parallel with each other. According to this structure, the harmonics are stored in the capacitors Ca, Cb, and Cc, so that harmonics are not applied to the grid or the converter 610, and the low frequency is transmitted through the first inductors and the second inductors. 610 is delivered smoothly. These inductors boost the AC power and boost the dc terminal voltage.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

1 is a circuit diagram showing a motor control apparatus of a conventional air conditioner.

2 is a schematic diagram of an air conditioner according to the present invention.

3 is a circuit diagram illustrating a motor control apparatus of an air conditioner according to an embodiment of the present invention.

4 is a simplified block diagram of a converter microcomputer.

5 is a simplified block diagram of an inverter microcomputer.

6 is a circuit diagram illustrating a motor control apparatus of an air conditioner according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

205: reactor 210,610: converter

220,620: Inverter 230,630: Inverter microcomputer

240,640: Converter microcomputer 430,530: Switching control signal output unit

440,540: Abnormality determination unit 605: LCL filter

Claims (17)

In the motor control device of the air conditioner, A converter having a plurality of converter switching elements, receiving a three-phase AC power and performing direct current power conversion by a switching operation of the converter switching element; An inverter having a plurality of inverter switching elements, receiving the DC power and converting the AC power into a AC power having a predetermined frequency by a switching operation of the switching element for the inverter to supply the three-phase electric motor; A converter micom for controlling a switching operation of the converter; And Inverter microcomputer for controlling the switching operation of the inverter; Motor control apparatus of an air conditioner comprising a. The method of claim 1, When one of the converter micom and the inverter micom detects an abnormal operation of the converter stage or an abnormal operation of the inverter, the microcomputer applies emergency data to another micom to stop the operation of the converter and the inverter. Motor control device of the machine. The method of claim 2, The converter micom, A switching control signal output unit for outputting a switching control signal for driving the switching element in the converter; And And determining whether there is an abnormality in the converter stage, and determining whether there is an abnormality outputting the emergency data to the switching control signal output unit and the inverter micom when the abnormality is determined. And the switching control signal output unit does not output the switching control signal when the emergency data is received. The method of claim 3, Input current detecting means for detecting an input current from the three-phase AC power source, The abnormality determining unit determines whether there is an abnormality based on the detected input current, and when determining the abnormality, outputs the emergency data to the switching control signal output unit and the inverter microcomputer. Control unit. The method of claim 4, wherein And the input current detecting means detects at least two phases of the three-phase input currents. The method of claim 3, Input voltage detecting means for detecting an input voltage from the three-phase AC power source, The abnormality determining unit determines whether there is an abnormality based on the detected input voltage, and when determining the abnormality, outputs the emergency data to the switching control signal output unit and the inverter microcomputer. Control unit. The method of claim 6, And the input voltage detecting means detects at least two phase input voltages of the three phase input voltages. The method of claim 3, And a dc terminal voltage detecting means for detecting a dc terminal voltage which is the converter output terminal. The abnormality determining unit determines whether there is an abnormality based on the detected dc terminal voltage, and when determining the abnormality, outputs the emergency data to the switching control signal output unit and the inverter micom. Motor controller. The method of claim 3, And further comprising a dc stage current detecting means for detecting a dc stage current which is the converter output stage. The abnormality determining unit determines whether there is an abnormality based on the detected dc terminal current, and outputs the emergency data to the switching control signal output unit and the inverter micom when abnormality is determined. Motor controller. The method of claim 1, The converter micom, A current command generation unit for generating a d, q-axis current command value based on a command value of a dc link stage voltage and a dc link stage voltage which are output terminals of the converter; And And a voltage command generation unit for generating a d, q-axis voltage command value based on the d, q-axis current command value and the input current from the commercial AC power supply. The method of claim 10, And the current command generation unit includes a d, q-axis current command limiting unit for limiting the level of the d, q-axis current command value. The method of claim 2, The inverter microcomputer, A switching control signal output unit configured to output a switching control signal for driving the switching element in the inverter; And determining whether there is an abnormality in the inverter stage, and determining whether there is an abnormality outputting the emergency data to the switching control signal output unit and the converter micom when the abnormality is determined. And the switching control signal output unit does not output the switching control signal when the emergency data is received. The method of claim 12, Output current detection means for detecting an output current which is the inverter output stage current, The abnormality determining unit determines whether there is an abnormality based on the detected output current, and when determining the abnormality, outputs the emergency data to the switching control signal output unit and the converter microcomputer. Control unit. The method of claim 13, And the output current detecting means detects at least two phases of the three-phase output currents. The method of claim 1, The inverter microcomputer, A speed estimating unit estimating a speed of the motor based on an output current detected from an output of the inverter; A current command generation unit that generates a current command value based on the estimated speed and the command speed; And And a voltage command generation unit for generating a voltage command value based on the current command value and the detected output current. The method of claim 1, And a reactor connected between the commercial AC power source and the converter, the reactor boosting the commercial AC power source. The method of claim 1, And a common mode LCL filter connected between the commercial AC power supply and the converter to limit harmonics from or from the commercial AC power supply.

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