KR20110132939A - Apparatus for controlling motor and operation of compressor including the motor - Google Patents

Apparatus for controlling motor and operation of compressor including the motor Download PDF

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Publication number
KR20110132939A
KR20110132939A KR1020100052553A KR20100052553A KR20110132939A KR 20110132939 A KR20110132939 A KR 20110132939A KR 1020100052553 A KR1020100052553 A KR 1020100052553A KR 20100052553 A KR20100052553 A KR 20100052553A KR 20110132939 A KR20110132939 A KR 20110132939A
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KR
South Korea
Prior art keywords
motor
smoothing capacitor
inverter
voltage
overload protector
Prior art date
Application number
KR1020100052553A
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Korean (ko)
Inventor
박찬갑
Original Assignee
엘지전자 주식회사
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Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020100052553A priority Critical patent/KR20110132939A/en
Publication of KR20110132939A publication Critical patent/KR20110132939A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • 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
    • 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

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

Abstract

PURPOSE: A motor and the drive controller of a compressor including the same are provided to enhance the safety of a system by including a overload protector capable of blocking a power source when generating overload. CONSTITUTION: A converter(20) changes an alternating current of common electricity(10) into direct current voltage. A smoothing capacitor(30) smooths the direct current voltage and outputs. A inverter(40) changes the direct current voltage which is smoothed into driving voltage of a motor and outputs. A overload protector(71) is included between a plus terminal of the smoothing capacitor and an input terminal of the inverter. The overload protector is included between an output terminal and a minus terminal of the smoothing capacitor. The overload protector secludes connection between inverter and the smoothing capacitor when generating overload.

Description

A motor and a driving control device for a compressor having the same {APPARATUS FOR CONTROLLING MOTOR AND OPERATION OF COMPRESSOR INCLUDING THE MOTOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor and a compressor having the same, and more particularly, to a motor control device which protects a compressor by shutting off power when the temperature of the compressor is high or excessive current flows, and an operation control device of a compressor having a motor. .

In general, a motor control device and an operation control device of a compressor having a motor include an AC-DC converter connected to an input power source, a smoothing capacitor, and an inverter connected to the smoothing capacitor to supply power for driving the motor. The operation control device of the compressor including the motor control device and the motor is attached to the compressor or connected to an input power source to cut off the power applied to the motor when an overload occurs such as a high temperature of the compressor or excessive current flow. It may further include an overload protector.

The motor control apparatus according to the prior art and the operation control apparatus of a compressor equipped with a motor, in particular, in the case of using three phases, connect a fuse or the like to the input power to cut off the load current of the three phases, and load the current of the load in the event of overload. Block all In this case, since the current and the temperature must be installed to apply both of the overload protector, the overload protector is attached to the compressor, and only the energized phase of the overload protector is installed at the input power stage. However, in this case, the input current and the load current are not the same, which makes it difficult to select an overload protector.

As another example, in the case of a three-phase motor and a compressor having the same, two or more overload protectors are provided to block the load current to block the three-phase load current. In the state that the motor is driven, the motor does not stop when only one phase is cut off, and since the motor continuously rotates, two powers must be cut off at the same time, and it is not driven at the same time due to the scattering of the operating point of the overload protector. There is a problem.

The present invention is to solve the above problems, the operation of the compressor having a motor control device and a motor having a single overload protector to easily cut off the power in the event of an overload of the three-phase motor and the compressor having the same. The object is to provide a control device.

Motor control apparatus according to the present invention for achieving the above object, a converter for converting the AC voltage of the commercial power supply to a direct current voltage, a smoothing capacitor connected in parallel to the converter, and smoothing the output DC voltage, and the smoothing An inverter for converting the output DC voltage into a driving voltage of a motor provided in the compressor and outputting the inverter; and an overload protector provided between the smoothing capacitor and the inverter, and blocking the connection between the smoothing capacitor and the inverter in case of overload. It is configured to include.

In the motor control apparatus according to the present invention, the overload protector is provided between the positive terminal of the smoothing capacitor and the input terminal of the inverter, or is provided between the output terminal of the inverter and the negative terminal of the smoothing capacitor. .

An operation control apparatus for a compressor according to the present invention for achieving the above object, the apparatus for controlling the operation of the compressor having a three-phase brushless DC motor, a converter for converting a commercial AC power source to a DC power source, and the direct current And a smoothing capacitor for smoothing and outputting the DC voltage of the power supply, and an overload protector for blocking the current output from the smoothing capacitor based on the current applied to the three-phase brushless DC motor or the temperature of the compressor.

In the operation control apparatus of the compressor according to the present invention, the overload protector is provided between the positive terminal of the smoothing capacitor and the input terminal of the inverter, or between the output terminal of the inverter and the negative terminal of the smoothing capacitor. It is provided.

In accordance with the present invention, a single overload protector is provided to easily cut off the power applied to the motor when an overload occurs such as a high temperature of the compressor or excessive current flow, thereby increasing the stability of the system and improving user convenience. Reduce production costs

1 is a block diagram schematically showing the configuration of a motor control apparatus according to the present invention;
2 is a view schematically showing a configuration of an operation control apparatus of a compressor according to an embodiment of the present invention;
3 is a diagram schematically illustrating a configuration of an operation control apparatus of a compressor according to another example of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the operation control apparatus of the motor control apparatus and the compressor provided with the motor according to the present invention.

Referring to FIG. 1, a motor control apparatus according to the present invention includes a converter 20 for converting an AC voltage of a commercial power supply 10 into a direct current voltage, connected in parallel with the converter, and smoothing and outputting the direct current voltage. It is provided between the smoothing capacitor 30, the inverter 40 which converts the smoothed DC voltage into the drive voltage of the motor 50 provided in the compressor, and outputs it, and between the smoothing capacitor and the inverter, And an overload protector 70 for blocking the connection between the smoothing capacitor and the inverter.

The converter 20 is an AC-DC converter, which is composed of a combination of diode rectifiers, and converts an AC voltage of an input power source, that is, a commercial power source 10 into a DC voltage. At this time, the DC voltage is actually a pulse flow.

The smoothing capacitor 30, also referred to as a DC link capacitor, smoothes the DC voltage in the form of a pulse current output from the converter 20 and outputs the same to the inverter 40 stage. When the power input to the commercial power supply 10 is AC 220V, the voltage applied to the smoothing capacitor 30 is about 310V DC.

The inverter 40 converts the DC voltage output from the smoothing capacitor 30 into a motor driving voltage according to a control signal and outputs the same to the motor 50. The inverter 40 has a plurality of switching elements, for example transistors.

The overload protector 70 is provided between the smoothing capacitor 30 and the switching element of the inverter 40 so that the smoothing capacitor 30 when the current applied to the motor 50 is overloaded by a predetermined value or more. And the connection of the inverter 40 are short-circuited. The overload protector 70 includes a current detector for sensing a current applied to the motor 50.

The motor 40 may be a brushless direct current motor (BLDC). The brushless DC motor (hereinafter referred to as BLDC) is a motor that removes brushes and commutators from a DC motor and installs an electronic commutator. The brushless DC motor has a low mechanical and electrical noise. The BLDC motor has a rotating magnet at its center and a drive coil around its periphery. In addition, since the BLDC motor has no rectifier, the BLDC motor further includes an electronic rectifier circuit. The electronic rectifier circuit senses the position of the magnet rotor using a stimulus sensor such as a hall element. Alternatively, the BLDC motor is controlled by a sensorless algorithm described later. The BLDC motor is used in fields requiring high rotational performance and long life, such as a cylinder of a VTR, a capstan of a cassette deck, an FDD, a CD player, and the like, and recently used in home appliances such as washing machines and dryers.

When using a three-phase BLDC motor, the overload protector (OLP) 70 must be installed on each phase. However, the motor control apparatus according to the present invention uses only one overload protector between the smoothing capacitor and the inverter.

The motor control device further includes a control unit 60 for outputting a control signal to the inverter 40 to drive the motor 50. The control unit 60 calculates a voltage command based on the motor driving current and the speed command, generates the control signal based on the voltage command and the triangular carrier wave, and outputs the control signal to the inverter 40. The control unit 60 detects the state of the motor 50 and supplies a control signal for driving the inverter based on the motor driving state to the inverter 40 to drive a DC voltage through the inverter 40. Change to voltage. Here, the control signal is generally a PWM signal for controlling the pulse width modulation (PWM) voltage duty of the inverter 40.

The motor control device further includes a current sensor for detecting a current applied to the motor, that is, a motor driving current. For example, the current sensor is a current transducer connected between the inverter 40 and the motor 50 to continuously detect the motor driving current. The current transducer detects the motor driving current, converts it into a voltage signal, and outputs it to the control unit 60. For example, in the case of a three-phase brushless direct current motor (BLDC), the current sensor detects two phases (iu, iv) of currents applied to three phases and outputs them to the control unit 60. do. The control unit 60 generates an interrupt signal to sample the voltage signal according to the detected motor driving current. As illustrated in FIG. 2 or 3, the current sensor may be a resistor 42 connected to an output terminal of the plurality of switching elements 41 in the inverter 40, that is, a shunt resistor.

The motor control device generally uses a sensorless algorithm. That is, the control unit 60 calculates the speed of the motor and the position of the rotor provided in the motor, receives the speed command and the calculated speed, outputs a current command, receives the current command and the detected current, and receives a voltage. Output the command. In addition, the control unit compares the triangular carrier wave and the voltage command, and generates a control signal according to the comparison result. In addition, the control unit receives the detected motor driving current, calculates and estimates the speed of the motor and the position of the rotor provided in the motor using a sensorless algorithm.

The control unit compares the speed command desired by the user with the estimated calculated speed, receives the speed command and the calculated speed, and proportionally integrates the difference between the speed command and the calculated speed, that is, the speed error, to generate a q-axis current command. Create The control unit then generates a voltage command using the q-axis current command and the d-axis current command. The control unit generates a q-axis voltage command using a proportional integral controller and a filter, and converts the current error compared to the q-axis operational current by axially converting the q-axis current command and the motor driving current. Generate the q-axis voltage command using the controller and filter. The control unit may generate a d-axis voltage command using a proportional integral controller and a filter, and convert the d-axis current command and the motor driving current into axial conversion to compare the d-axis current with the d-axis operational current. Generate the d-axis voltage command using the proportional integral controller and the filter.

The control unit converts the voltage command of the synchronous coordinate system into the voltage command of the stationary coordinate system, and then 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 control unit 60 converts the voltage command of the stationary coordinate system into a three-phase voltage command and outputs it to the inverter 40.

The motor control apparatus converts a voltage output from the smoothing capacitor to the control unit 60 into a DC voltage having a constant value, for example, 5V and outputs the DC-DC converter, that is, a regulator ( Regulator may be further included.

The overload protector 70 is provided between the (+) end of the smoothing capacitor and the input end of the inverter, or is provided between the output end of the inverter and the (-) end of the smoothing capacitor.

Referring to Figure 2, the operation control apparatus of the compressor according to the present invention, in the apparatus for controlling the operation of the compressor having a three-phase brushless DC motor, a converter for converting a commercial AC power supply 10 into a DC power supply ( 20), a smoothing capacitor 30 for smoothing and outputting the DC voltage of the DC power supply, and a current output from the smoothing capacitor based on the current applied to the three-phase brushless DC motor or the temperature of the compressor. It is configured to include an overload protector (71). The overload protector 71 is provided between the plus end of the smoothing capacitor and the input end of the inverter.

The converter 20, as an AC-DC converter, is composed of a combination of diode rectifiers and converts an input power source, that is, a commercial power source 10 into a DC power source. At this time, the DC power supply is actually a pulse current.

The smoothing capacitor 30, also referred to as a DC link capacitor, smoothes the pulsed DC power output from the converter 20, stores it, and outputs the same to the inverter 40. When the power input to the commercial power supply 10 is AC 220V, the voltage applied to the smoothing capacitor 30 is about 310V DC.

The inverter 40 converts the DC voltage output from the smoothing capacitor 30 into a motor driving voltage according to a control signal and outputs the same to the motor 50. The inverter 40 includes a plurality of switching elements 41, for example, transistors such as an IGBT and a MOSFET. In addition, the inverter 40 further includes a shunt resistor 42 for sensing a current applied to the three-phase brushless DC motor. Instead of the shunt resistor, a current transducer that is connected between the inverter 40 and the motor 50 and continuously senses the current sensor may sense a current applied to the motor.

The overload protector 71 is provided between the (+) end of the smoothing capacitor 30 and the input end of the switching element of the inverter 40 to provide a current applied to the three-phase brushless DC motor or the temperature of the compressor. Based on this, the current output from the smoothing capacitor is cut off. The overload protector 70 includes a current detector for sensing a current applied to the motor. In addition, the overload protector 70 may further include a temperature sensor for sensing the temperature of the compressor. Here, the brushless DC motor (hereinafter referred to as BLDC) is a motor that removes brushes and commutators from a DC motor and installs an electronic commutator. The brushless DC motor includes a magnet that rotates in the center and a driving coil around the periphery thereof. Equipped. In addition, since the BLDC motor has no rectifier, the BLDC motor further includes an electronic rectifier circuit.

Referring to Figure 3, the operation control apparatus of the compressor according to the present invention, in the apparatus for controlling the operation of the compressor having a three-phase brushless DC motor, a converter for converting a commercial AC power supply 10 into a DC power supply ( 20), a smoothing capacitor 30 for smoothing and outputting the DC voltage of the DC power supply, and a current output from the smoothing capacitor based on the current applied to the three-phase brushless DC motor or the temperature of the compressor. And an overload protector 72, which is provided between the output terminal of the inverter and the minus terminal of the smoothing capacitor. Hereinafter, descriptions of other components will be omitted in place of the description of FIG. 1 or FIG. 2.

Unlike the overload protector 71 in FIG. 2, the overload protector 72 in FIG. 3 is connected to the negative terminal of the smoothing capacitor. The overload protector 71 in FIG. 2 is attached to an output terminal of the smoothing capacitor 30, that is, a positive terminal and a circuit connection connected to an input terminal of the inverter 40, while directly supplying a load current to the overload protector. It is formed to cut off all three-phase load current with only overload protector of. On the other hand, the overload protector 72 in FIG. 3 is attached to a position for detecting a current returning from the inverter 40 to the input power supply terminal and is formed to block all three-phase load currents using one overload protector. .

As described above, the motor control apparatus according to the present invention and the operation control apparatus of the compressor including the motor include one overload protector between the smoothing capacitor and the inverter so that the compressor temperature is high or excessive current flows. If an overload occurs, the power applied to the motor can be easily cut off.

10: commercial power 20: converter
30: smoothing capacitor 40: inverter
50: motor 60: control unit
70, 71, 72: overload protector 80: compressor

Claims (7)

A converter for converting an AC voltage of a commercial power source into a DC voltage;
A smoothing capacitor connected in parallel with the converter and outputting the smoothed DC voltage;
An inverter converting the smoothed DC voltage into a driving voltage of a motor provided in the compressor and outputting the converted voltage; And
And an overload protector provided between the smoothing capacitor and the inverter to block a connection between the smoothing capacitor and the inverter during an overload. The method of claim 1, wherein the overload protector,
The motor control device, characterized in that provided between the positive terminal of the smoothing capacitor and the input terminal of the inverter. The method of claim 1, wherein the overload protector,
And an output terminal of the inverter and a minus terminal of the smoothing capacitor. The method of claim 1, wherein the motor,
A motor control device comprising a three-phase brushless DC motor. In the apparatus for controlling the operation of the compressor having a three-phase brushless DC motor,
A converter for converting commercial AC power into DC power;
A smoothing capacitor that smoothes and outputs the DC voltage of the DC power supply; And
And an overload protector for blocking the current output from the smoothing capacitor based on the current applied to the three-phase brushless DC motor or the temperature of the compressor. The method of claim 5, wherein the overload protector,
And a positive stage of the smoothing capacitor and an input terminal of the inverter. The method of claim 5, wherein the overload protector,
And an output terminal of the inverter and a negative terminal of the smoothing capacitor.
KR1020100052553A 2010-06-03 2010-06-03 Apparatus for controlling motor and operation of compressor including the motor KR20110132939A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100052553A KR20110132939A (en) 2010-06-03 2010-06-03 Apparatus for controlling motor and operation of compressor including the motor

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Application Number Priority Date Filing Date Title
KR1020100052553A KR20110132939A (en) 2010-06-03 2010-06-03 Apparatus for controlling motor and operation of compressor including the motor

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020096385A1 (en) * 2018-11-07 2020-05-14 주식회사 현대케피코 Device and method for controlling bldc motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020096385A1 (en) * 2018-11-07 2020-05-14 주식회사 현대케피코 Device and method for controlling bldc motor
KR20200052665A (en) * 2018-11-07 2020-05-15 주식회사 현대케피코 BLDC motor control device and method

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