KR20130043531A - Apparatus and method for controlling motor - Google Patents

Apparatus and method for controlling motor Download PDF

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Publication number
KR20130043531A
KR20130043531A KR1020110107742A KR20110107742A KR20130043531A KR 20130043531 A KR20130043531 A KR 20130043531A KR 1020110107742 A KR1020110107742 A KR 1020110107742A KR 20110107742 A KR20110107742 A KR 20110107742A KR 20130043531 A KR20130043531 A KR 20130043531A
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KR
South Korea
Prior art keywords
voltage
motor
current
inverter
motor driving
Prior art date
Application number
KR1020110107742A
Other languages
Korean (ko)
Inventor
조영호
Original Assignee
엘지전자 주식회사
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Priority to KR1020110107742A priority Critical patent/KR20130043531A/en
Publication of KR20130043531A publication Critical patent/KR20130043531A/en

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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
    • 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
    • H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
    • 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
    • H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
    • 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
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE: A motor controlling device and a controlling method thereof are provided to prevent damage to switching elements by driving an inverter according to the voltage of a DC link capacitor. CONSTITUTION: A converter(200) receives input power(100) which is converted into DC voltage. A DC link capacitor(300) smoothens and stores the converted DC voltage. An inverter(400) applies motor driving voltage to a motor. A control unit(700) outputs a control signal to the inverter. The control unit blocks the output of the control signal based on DC link voltage applied to the DC link capacitor. [Reference numerals] (110) DC input power supply; (200) Converter; (400) Inverter; (700) Control unit;

Description

Motor control device and control method {APPARATUS AND METHOD FOR CONTROLLING MOTOR}

The present invention relates to a motor control apparatus and a control method having a function of protecting switching elements in an inverter for driving a motor.

A refrigerator is a device that lowers the temperature in a closed container below the temperature around it, for example, a vapor compression refrigerator comprises a compressor, a condenser, an evaporator, and an expansion valve. The compressor is operated by a motor to compress a gaseous refrigerant and send it to a condenser, which is cooled by liquefaction with water or air outside the refrigerator. When the liquid refrigerant is injected into the evaporator while the flow rate is adjusted in the expansion valve, it expands and vaporizes rapidly, absorbs heat from the vicinity of the evaporator, and cools the inside of the container. The gaseous refrigerant is then returned to the compressor and compressed to a liquid state. This repeated four-step change of compression, condensation, expansion, and vaporization is called the refrigeration cycle. The application of the freezer is very wide. For example, the refrigerator is used in various fields such as a domestic refrigerator, a food storage freezer, an air conditioner, a chiller, and the like.

In general, an electric motor such as an induction motor (hereinafter, a motor) is used to drive a compressor of a refrigerator. For example, an apparatus for controlling an induction motor measures the speed and the magnetic field of the rotor of the motor to control the speed and torque of the motor to match the required compressor load. In addition, a triac or inverter is mainly used to drive the motor. In particular, the motor control apparatus using the inverter controls the compressor by applying a pulse width modulation (PWM) voltage, which is an inverter output voltage, to the induction motor according to the ratio of the rotation speed and the required voltage.

An embodiment of the present invention is to provide a motor control apparatus and a motor control method for protecting the switching elements in the inverter by driving the inverter in accordance with the voltage of the DC link capacitor.

It is another object of the present invention to provide a motor control apparatus and a motor control method for controlling the driving of switching elements in an inverter based on a voltage of a DC link capacitor or an inverter output current.

According to an embodiment of the present disclosure, a motor control apparatus includes a converter configured to receive input power and convert the input power into a DC voltage, a DC link capacitor to smooth and store the converted DC voltage, and a plurality of switching elements, based on a control signal. Converting the smoothed DC voltage into a motor driving voltage, generating an inverter for applying the motor driving voltage to the motor, the control signal for opening and closing the plurality of switching elements, and outputting the control signal to the inverter. And a control unit, the control unit interrupts the output of the control signal based on the DC link voltage applied to the DC link capacitor.

The motor control apparatus according to an embodiment further includes a DC link voltage detection unit detecting the DC link voltage, and a comparison unit comparing the DC link voltage and a predetermined reference voltage, wherein the control unit includes the DC link. If the voltage is below the reference voltage, the output of the control signal is cut off.

The motor control apparatus according to another embodiment further includes a current detection unit detecting a motor driving current output from the inverter, wherein the control unit compares the motor driving current with a predetermined reference current and based on a comparison result. Determine if there is overcurrent.

A refrigerator according to an embodiment includes a compressor provided in a main body and compressing a refrigerant at high temperature and high pressure, a motor provided in or connected to the compressor and driving the compressor, and a motor control device.

According to an embodiment, a motor control method includes a converter for converting an input power into a DC voltage, a DC link capacitor for smoothing and storing the converted DC voltage, and a plurality of switching elements and smoothing the signal based on a control signal. A motor control apparatus comprising an inverter converting a predetermined DC voltage into a motor driving voltage and applying the same to a motor, the motor control apparatus comprising: detecting the smoothed DC voltage stored in the DC link capacitor, the smoothed DC voltage and a predetermined reference voltage; And comparing the control signal with the output signal and blocking the output of the control signal when the smoothed DC voltage is less than or equal to the reference voltage.

Embodiments of the present invention protect the switching elements in the inverter by driving the inverter according to the voltage of the DC link capacitor, and improve the stability of the inverter and the motor.

Embodiments of the present invention prevent the burnout of switching elements in the inverter and improve the stability of the inverter and the motor by controlling the driving of the switching elements in the inverter based on the voltage of the DC link capacitor or the inverter output current.

1 is a schematic view of a motor control apparatus according to an embodiment;
2 is a schematic view of a motor control apparatus according to another embodiment;
3 is a view illustrating an operation of controlling a control signal output to an inverter according to embodiments of the present invention;
4 is a view illustrating an operation of generating a control signal for an inverter according to embodiments of the present invention;
5 is a schematic view of a motor control apparatus according to another embodiment;
6 is a view illustrating a configuration of an air conditioner as an example of a refrigerator having a motor control apparatus according to embodiments of the present disclosure; And
7 and 8 are flowcharts schematically illustrating a motor control method according to embodiments of the present disclosure.

Referring to FIG. 1, a motor control apparatus according to an exemplary embodiment includes a converter 200 that receives an input power source 100 and converts the input power source into a DC voltage, and a DC link capacitor 300 that smoothes and stores the converted DC voltage. And an inverter 400 including a plurality of switching elements, converting the smoothed DC voltage into a motor driving voltage based on a control signal, and applying the motor driving voltage to the motor 500. And a control unit 700 which generates the control signal for opening and closing switching elements and outputs the control signal to the inverter. Here, the control unit 700 blocks the output of the control signal based on the DC link voltage applied to the DC link capacitor.

The input power source 100 may be a commercial AC power source, as shown in FIG. 1. In addition, the input power supply 100 may be single phase or three phase. For example, in the case of using an induction motor as a motor for a refrigerator compressor, the input power source 100 uses a 380V three-phase power source.

The converter 200 may have a form of one or a plurality of diodes or a diode bridge. In addition, when the input power source 100 is three-phase, the converter 200 may have a form in which diodes are connected to three-phase power lines, respectively. In addition, the converter 200 may further include a switching element. That is, the converter 200 may include a switching element driven according to a converter control signal output from the control unit 700, for example, an insulated gate bipolar transistor (IGBT). . The converter 200 further includes a reactor as needed to convert an AC voltage of an input power source into a DC voltage. The DC voltage converted through the converter 200 is actually in the form of a pulse.

As shown in FIG. 5, the input power source may be a DC input power source 110 such as a battery or a solar cell. In this case, the converter 200 may be a DC-DC converter, not an AC-DC converter, and may include a boost function.

The DC link capacitor 300 is connected between the converter 200 and the inverter 400 to smooth and store the output DC voltage of the converter 200.

The inverter 400 includes a plurality of switching elements, and uses a control signal generated from the control unit 700, for example, a pulse width modulation (PWM) driving signal to drive the motor driving voltage according to a voltage command to the motor 500. And a current is applied.

The motor control apparatus may further include a reactor disposed between the input power source 100 and the converter 200 to smooth the AC power, improve the power factor, or remove the harmonic components, or a circuit including the reactor. have.

Referring to FIG. 3, a motor control apparatus according to an embodiment may include a DC link voltage detection unit 610 for detecting the DC link voltage, and a comparison unit 630 for comparing the DC link voltage with a predetermined reference voltage. It is configured to include more. Here, the control unit 700 blocks the output of the control signal when the DC link voltage is less than or equal to the reference voltage. The motor control apparatus may further include a DC link current detection unit connected to the DC link capacitor 300 to detect a current i DC output from the DC link capacitor. The DC link voltage detection unit 610 and the comparison unit 630 may be configured as separate circuits, respectively.

The comparison unit 630 is composed of Vref (+), Vin (−), and Vout. Vref is a reference voltage value for the DC link voltage, and Vin is a voltage value detected by the DC link voltage detection unit 610. The comparison unit 630 compares the reference value with the detection value, and when Vin is less than or equal to Vref, Vout is output. The output value Vout is applied to the Itrip terminal of the control unit 700 via the RC filter. That is, when the voltage stored in the DC link capacitor falls below the reference voltage, the control unit 700 blocks the output of the control signal for driving the switching elements of the inverter.

Referring to FIG. 2, the motor control apparatus according to another embodiment may further include a current detection unit 620 that detects a motor driving current output from the inverter.

As illustrated in FIG. 1, the current detection unit 620 may be a current transducer connected between the inverter 400 and the motor 500 to continuously detect a motor driving current. . The current transducer detects the motor driving current, converts it into a voltage signal, and outputs it to the control unit 700. In addition, the current transducer detects the motor drive current in the entire section of the pulse width modulation. For example, in the case of a three-phase brushless DC (BLDC) motor, the current detection unit detects two phases (iu, iv) of currents applied to the three phases and outputs the control unit 700, and the control unit 700. Generates an interrupt signal to sample the voltage signal according to the detected motor drive current.

Referring to FIG. 2, the current detection unit 620 is a shunt resistor in series with a switching element in the inverter 400. Here, the control unit 700 compares the motor driving current with a predetermined reference current, and determines whether there is an overcurrent based on a comparison result. An overcurrent detection circuit may be separately configured in the motor control device.

The DC link voltage detection unit 610 detects a DC voltage stored in the DC link capacitor 300. The comparison unit 630 is composed of Vref (+), Vin (−), and Vout. Vref is a reference voltage value for the DC link voltage, and Vin is a voltage value detected by the DC link voltage detection unit 610. The comparison unit 630 compares the reference value with the detection value, and when Vin is less than or equal to Vref, Vout is output. The output value Vout is applied to the Itrip terminal of the control unit 700 via the RC filter. Here, the RC filter 640 blocks the noise flowing into the Itrip terminal.

The current detection unit 620 detects, for example, inverter output currents iu, iv, iw, i.e., motor applied currents, which are output from switching elements in the inverter flowing to the shunt resistor. The inverter output current is converted into voltage through a shunt resistor. The motor applied current converted into voltage is applied to the Itrip terminal via the RC filter 640. At this time, when a current of a predetermined reference current or more flows through the shunt resistor, a predetermined voltage value (for example, 0.5 V) or more is applied to the Itrip terminal of the control unit 700, and the control unit 700 determines that an overcurrent has occurred. . The control unit 700 blocks the PWM driving signal output to the inverter when it is determined that the overcurrent.

The control unit 700 generates a control signal by sampling a motor driving current, that is, an inverter output current, and outputs the control signal to the inverter 400. Referring to FIG. 4, the control unit 700 receives a motor driving current, calculates a rotor speed of the motor and a position of the rotor included in the motor, and calculates a speed command and a calculation speed. A speed controller 720 that receives an input and outputs a current command, a current controller 730 that receives a current command and a detected current and outputs a voltage command, compares a triangular carrier and a voltage command, and controls according to the comparison result. And a pulse width modulation control unit 740 for generating a signal.

The calculation unit 710 receives the motor driving current detected by the current detection unit 620, calculates and estimates the speed ω of the motor and the position of the rotor provided in the motor using a sensorless algorithm. Of course, when the motor control device is provided with a hall sensor for detecting the rotor position, the control unit 700 may not include the calculator 710.

The speed control unit 720 is a speed command desired by the user (

Figure pat00001
), A comparator (not shown) for comparing the estimated speed calculated by the calculator 710, and a first proportional integral controller (PI) (not shown). The speed controller 720 receives the speed command and the calculation speed, and proportionally integrates the difference between the speed command and the calculation speed, that is, the speed error, to obtain the q-axis current command (
Figure pat00002
) Is output to the current controller 730.

The current controller 730 is a q-axis current command and a d-axis current command (generated by the speed controller 720)

Figure pat00003
) Is input to generate and output a voltage command. The current controller 730 sends the q-axis current command to the q-axis voltage command through the second proportional integral controller and the filter.
Figure pat00004
) Is output to the pulse width modulation control unit 740. That is, the current control unit 730 is a q-axis operation current (axis conversion of the motor drive current detected through the q-axis current command and the current detection unit 620 (
Figure pat00005
). The current controller 730 passes the current error through a second proportional integral controller and a filter, and then the q-axis voltage command (
Figure pat00006
) Is output to the pulse width modulation control unit 740. Meanwhile, the current controller 730 sends the d-axis current command to the d-axis voltage command through a third proportional integration controller and a filter (
Figure pat00007
) Is output to the pulse width modulation control unit 740. That is, the current control unit 730 is the d-axis operation current (axis conversion of the motor drive current detected by the d-axis current command and the current detection unit 620 (
Figure pat00008
). The current controller 730 passes the current error through the third proportional integration controller and the filter to the d-axis voltage command (
Figure pat00009
) Is output to the pulse width modulation control unit 740. Here, (d, q) represents a synchronous coordinate system.

The pulse width modulation control unit 740 first converts the voltage command of the synchronous coordinate system into the voltage command of the stationary coordinate systems α and β. That is, the pulse width modulation control unit 740 is (

Figure pat00010
) (
Figure pat00011
). In addition, the pulse width modulation control unit 740 converts and outputs the voltage command of the stationary coordinate system according to the type of motor to be driven. For example, in the case of a three-phase BLDC motor, the pulse width modulation control unit 740 converts the voltage command of the stationary coordinate system into a three-phase voltage command (
Figure pat00012
) And outputs the same to the inverter 400.

Figure 5 is a refrigerator having a motor control apparatus according to the embodiments, an example showing an air conditioner. The air conditioner includes a compressor provided in the main body and compressing the refrigerant at high temperature and high pressure, a motor provided in or connected to the compressor and driving the compressor, and a motor control device.

Referring to FIG. 5, an air conditioner according to an embodiment includes a compressor 12, a first heat exchanger 13, an expansion valve 14, and a second heat exchanger 15 in a case 11. A refrigeration cycle is installed, and a plurality of intake fans 16 are installed on the upper or side surfaces of the case 11 to suck heat from outside to exchange heat with the first heat exchanger 13. 15, the medium circulation pipe 30 for supplying cold water or hot water to the indoor units 20 is connected. At the outlet of the compressor 12, a refrigerant switching valve 17 for converting the refrigerant compressed by the compressor 12 into the first heat exchanger direction or the second heat exchanger direction according to the operating condition is installed. The refrigerant switching valve 17 is usually composed of a four-way valve.

The air conditioner operates as a cooler in the summer, while switching to a heater in the winter. For example, in the summer season, the refrigerant switching valves, which are compressed at high temperature and high pressure, in the compressor 12 are guided to the first heat exchanger 13 to heat-exchange with air in the first heat exchanger 13. After the low temperature and low pressure are made at (14), heat is exchanged with water in the second heat exchanger (15), and the heat exchanged water is supplied to the indoor units (20) using the cooling heat source. Meanwhile, in winter, the refrigerant switching valve 17 guides the refrigerant in the direction of the second heat exchanger so that the high temperature and high pressure refrigerant exchanges heat with water in the second heat exchanger 15 to use the heat exchanged water as a heating heat source. The indoor unit 20 is supplied.

Referring to FIG. 7, the method for controlling a motor according to an embodiment includes detecting a smoothed DC voltage stored in a DC link capacitor (S110), and comparing the smoothed DC voltage with a predetermined reference voltage (S120). And blocking the output of the control signal when the smoothed DC voltage is less than or equal to the reference voltage (S130). Hereinafter, the configuration of the apparatus will be described with reference to FIGS. 1 to 5.

The motor control apparatus detects the DC voltage Vin stored in the DC link capacitor through the converter (S110). The motor control apparatus may preset a reference voltage value Vref for the DC link voltage, and compare the reference value Vref with the detection value Vin (S120). As a result of the comparison, the motor control apparatus outputs the output value Vout when the detection value Vin is equal to or less than the reference value Vref. When the output value Vout is output, the motor controller blocks the control signal applied to the inverter (S130).

Referring to FIG. 7, the motor control method includes detecting a motor driving current output from the inverter (S140), comparing the motor driving current with a predetermined reference current (S150), and the motor driving current. If is equal to or more than the reference current, the step of blocking the output of the control signal (S130) is configured to further comprise.

The motor control apparatus detects an inverter output current (iu, iv, iw) output from switching elements in the inverter, that is, a motor applied current flowing to the shunt resistor (S140). The inverter output current is converted into voltage through a shunt resistor. When a current equal to or greater than a predetermined reference current flows through the shunt resistor, a predetermined voltage value (for example, 0.5 V) or more occurs, and the motor controller determines that an overcurrent flows through the shunt resistor. When the overcurrent is detected, the motor controller blocks the PWM driving signal output to the inverter (S130).

Referring to FIG. 8, the motor control method according to another embodiment may include converting an input power source into a direct current voltage (S211), smoothing the converted direct current voltage (S212), and And converting the smoothed DC voltage into a motor driving voltage (S261) and applying the motor driving voltage to the motor (S262). The motor control method may include calculating a rotor speed of the motor using the motor driving current (S291), and generating the control signal based on a speed command and the rotor speed (S292). It is configured to further include.

The motor controller receives the input power and converts the input power into DC voltage (S211), and smoothes and stores the converted DC voltage (S212). The motor control apparatus detects a DC voltage stored in the DC link capacitor (S220), and compares the detected voltage Vin with a preset reference voltage Vref (S230). If the detected voltage is greater than the reference voltage, a PWM drive signal is generated and the DC voltage smoothed according to the control signal is converted into a motor drive voltage (S261), and the motor drive voltage is applied to the motor. The motor control apparatus detects a motor driving current output from the inverter, and determines whether the motor driving current is an overcurrent (S280). If it is determined that the motor driving current is an overcurrent, the motor controller blocks the PWM driving signal output to the inverter (S240). Meanwhile, when the detection voltage Vin is less than or equal to the reference voltage Vref, that is, when the DC link voltage falls below or equal to the reference voltage, the motor controller blocks the PWM driving signal output to the inverter (S240).

On the other hand, in the motor control apparatus, if the DC link voltage is higher than the reference voltage and the motor drive current is not overcurrent, the motor speed is based on the motor drive current and the sensorless algorithm is used to determine the rotor speed of the motor and the position of the rotor in the motor. The position of the rotor can be detected by using or by using a Hall sensor or the like (S291). The motor control apparatus compares the speed command with the rotor speed and generates a control signal for driving the switching elements in the inverter according to the speed difference (S292). The motor controller applies the generated control signal to the inverter to drive the inverter. The motor control apparatus may continuously detect the DC link voltage stored in the DC link capacitor to determine whether the DC link voltage falls below a predetermined voltage.

As described above, the motor control apparatus and the control method according to the embodiments of the present invention protects the switching elements in the inverter by driving the inverter in accordance with the voltage of the DC link capacitor. Embodiments of the present invention detect the voltage of the DC link capacitor or the output current of the inverter and accordingly cut off the driving of the switching elements in the inverter to prevent the burning of the switching elements in the inverter, and improve the stability of the inverter and the motor.

100: input power 200: converter
300: DC link capacitor 400: inverter
500: motor 610: DC link voltage detection unit
620: current detection unit 700: control unit
10: outdoor unit 20: indoor unit

Claims (10)

A converter which receives an input power and converts it into a DC voltage;
A DC link capacitor for smoothing and storing the converted DC voltage;
An inverter having a plurality of switching elements, converting the smoothed DC voltage into a motor driving voltage based on a control signal, and applying the motor driving voltage to a motor; And
And a control unit generating the control signal to open and close the plurality of switching elements, and outputting the control signal to the inverter.
Wherein the control unit comprises:
And cut off the output of the control signal based on the DC link voltage applied to the DC link capacitor. The method according to claim 1,
A direct current link voltage detection unit detecting the direct current link voltage; And
And a comparing unit comparing the DC link voltage with a predetermined reference voltage.
And the control unit cuts off the output of the control signal when the DC link voltage is equal to or less than the reference voltage. 3. The method according to claim 1 or 2,
And a current detecting unit detecting a motor driving current output from the inverter. The method of claim 3, wherein the control unit,
And comparing the motor driving current with a predetermined reference current and determining whether there is an overcurrent based on a comparison result. The method of claim 4, wherein the current detection unit,
And a shunt resistor converting the motor driving current into a voltage to output the motor. The method of claim 1, wherein the control unit,
A calculator configured to receive the motor driving current and calculate a rotor speed of the motor;
A speed controller which receives the speed command and the rotor speed and calculates and outputs a current command;
A current controller which receives the current command and the motor driving current and calculates and outputs a voltage command; And
And a pulse width modulation controller configured to generate the control signal based on the voltage command. A compressor provided in the main body and compressing the refrigerant to a high temperature and a high pressure;
A motor provided in or connected to the compressor and driving the compressor; And
Refrigerator comprising a; the motor control device according to any one of claims 1 to 6. A converter for converting an input power into a DC voltage, a DC link capacitor for smoothing and storing the converted DC voltage, a plurality of switching elements, and converting the smoothed DC voltage into a motor driving voltage based on a control signal. In the motor control device comprising an inverter applied to the motor,
Detecting the smoothed DC voltage stored in the DC link capacitor;
Comparing the smoothed DC voltage with a predetermined reference voltage; And
Blocking the output of the control signal when the smoothed DC voltage is less than or equal to the reference voltage. The method of claim 8,
Detecting a motor driving current output from the inverter;
Comparing the motor driving current with a constant reference current; And
Blocking the output of the control signal when the motor driving current is equal to or greater than the reference current. 10. The method of claim 9,
Converting an input power source into a DC voltage;
Smoothing the converted DC voltage;
Converting the smoothed DC voltage into a motor driving voltage;
Applying the motor driving voltage to a motor;
Calculating a rotor speed of the motor by using the motor driving current; And
Generating the control signal based on a speed command and the rotor speed.
KR1020110107742A 2011-10-20 2011-10-20 Apparatus and method for controlling motor KR20130043531A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160070548A (en) * 2014-12-10 2016-06-20 엘지전자 주식회사 Control apparatus of a compressor, method for controlling a compressor and refrigerator
KR101887864B1 (en) 2017-03-30 2018-09-06 태영토탈시스템주식회사 A control device for controlling a plurality of motors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160070548A (en) * 2014-12-10 2016-06-20 엘지전자 주식회사 Control apparatus of a compressor, method for controlling a compressor and refrigerator
KR101887864B1 (en) 2017-03-30 2018-09-06 태영토탈시스템주식회사 A control device for controlling a plurality of motors

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