KR20020046314A - Method for driving PMSM of refrigerator compressor - Google Patents

Method for driving PMSM of refrigerator compressor Download PDF

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Publication number
KR20020046314A
KR20020046314A KR1020000075634A KR20000075634A KR20020046314A KR 20020046314 A KR20020046314 A KR 20020046314A KR 1020000075634 A KR1020000075634 A KR 1020000075634A KR 20000075634 A KR20000075634 A KR 20000075634A KR 20020046314 A KR20020046314 A KR 20020046314A
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KR
South Korea
Prior art keywords
motor
driving
permanent magnet
magnet synchronous
speed
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KR1020000075634A
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Korean (ko)
Inventor
김용태
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구자홍
엘지전자주식회사
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Priority to KR1020000075634A priority Critical patent/KR20020046314A/en
Publication of KR20020046314A publication Critical patent/KR20020046314A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • 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
    • H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
    • H02P2205/07—Speed loop, i.e. comparison of the motor speed with a speed reference
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/045—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value

Abstract

PURPOSE: A method for driving permanent magnet synchronous motor is provided to minimize a noise and maximize driving efficiency of a motor by driving the motor with a square wave or a sine wave according to a high/low rate of driving band. CONSTITUTION: A first process(S10) judges if a current driving rate of a motor is higher than an established rate in rpm. A second process(S20) drives the motor with a square wave if the current driving rate of the motor is higher than the established rate. A third process(S30) drives the motor with a sine wave if the current driving rate of the motor is lower than the established rate. The established rate is a value in the range from 1800 to 3600 rpm.

Description

냉장고 압축기의 영구자석 동기 전동기 구동방법 {Method for driving PMSM of refrigerator compressor}Method for driving permanent magnet synchronous motor of refrigerator compressor {Method for driving PMSM of refrigerator compressor}

본 발명은 냉장고의 압축기에 설치된 영구자석 동기 전동기에 관한 것으로, 특히 냉장고 압축기의 영구자석 동기 전동기 구동방법에 관한 것이다.The present invention relates to a permanent magnet synchronous motor installed in a compressor of a refrigerator, and more particularly, to a method of driving a permanent magnet synchronous motor of a refrigerator compressor.

일반적으로 냉장고는 식품을 신선하게 장기간 보관할 수 있도록 하는 기기로서, 일반적인 구성은 본체와, 냉동실, 냉장실 및 냉동 싸이클로 구성되어 있다. 냉동 싸이클은 냉동실 및 냉장실에 냉기를 공급시키는 역할을 하는 것으로서, 그의 개략적인 구성은 압축기, 응축기, 모세관, 증발기 및 팬모터로 구성되어 있다.In general, a refrigerator is a device for keeping food fresh for a long time, and a general configuration includes a main body, a freezer compartment, a refrigerating compartment, and a freezing cycle. The refrigeration cycle serves to supply cold air to the freezer compartment and the refrigerating compartment, and its schematic configuration includes a compressor, a condenser, a capillary tube, an evaporator, and a fan motor.

압축기는 저온, 저압의 기체냉매를 고온, 고압의 기체냉매로 압축시키며, 응축기는 고온, 고압의 기체냉매의 열을 발산시켜 고온, 고압의 액체냉매로 변환시킨다.The compressor compresses low-temperature, low-pressure gas refrigerant into high-temperature, high-pressure gas refrigerant, and the condenser dissipates heat of the high-temperature, high-pressure gas refrigerant to convert it into a high-temperature, high-pressure liquid refrigerant.

그리고 고온, 고압의 액체냉매는 모세관을 통해 흐르면서 저온, 저압의 액체냉매로 바뀌어지며, 증발기는 저온, 저압의 액체냉매를 다시 저온, 저압의 기체냉매로 기화시키면서 냉기를 발생시킨다. 또한, 팬모터는 증발기에서 발생된 냉기를 냉장실 또는 냉동실로 송풍시킨다.The high-temperature and high-pressure liquid refrigerant flows through the capillary tube and is converted into a low-temperature and low-pressure liquid refrigerant. The evaporator generates cold air while vaporizing the low-temperature and low-pressure liquid refrigerant into a low-temperature and low-pressure gas refrigerant. In addition, the fan motor blows cold air generated in the evaporator to the refrigerating chamber or the freezing chamber.

압축기는 영구자석 동기 전동기의 회전력을 이용하여 냉매를 압축시키는데, 해당 영구자석 동기 전동기는 구동방식에 따라 BLDCM(Brushless DC Motor)와 PMSM(Permanent Magnet Synchronous Motor)으로 분류된다.The compressor compresses the refrigerant by using the rotational force of the permanent magnet synchronous motor. The permanent magnet synchronous motor is classified into a brushless DC motor (BLDCM) and a permanent magnet synchronous motor (PMSM) according to a driving method.

여기서 일반적으로 상기 영구자석 동기 전동기를 구형파로 구동할 때 BLDCM 라고 하고, 정현파로 구동할 때 PMSM 이라고 한다.Generally, the permanent magnet synchronous motor is referred to as a BLDCM when driven by a square wave, and referred to as a PMSM when driven by a sine wave.

상기 2 가지 경우 모두 구동하는 파형에 맞는 전동기의 구조가 될 때 최대의 효율점을 가지는데, BLDCM의 경우 영구자석에 착자 형상이 구형파(또는 사다리꼴)를 가지고 스테이터(stator)의 권선도 집중권이 될 때 최고의 효율과 최소의 토크 리플(Torque Ripple)을 가지게 된다.In both cases, the maximum efficiency point is obtained when the motor is configured to fit the driving waveform. In the case of BLDCM, the magnetization shape of the permanent magnet has a square wave (or trapezoid) and the winding of the stator also has a concentrated zone. The highest efficiency and the smallest torque ripple will be achieved.

즉, 토크 변화를 최소로하여 일정 수준의 토크를 유지시킬 수 있다.That is, it is possible to maintain a certain level of torque by minimizing the torque change.

그리고 상기 PMSM의 경우는 영구자석이 정현파 형태로 착자되어 있고 스테이터의 권선도 분포권으로 정현파 구동에 맞게 되어야 최고의 효율을 갖게 된다.In the case of the PMSM, the permanent magnet is magnetized in the form of a sinusoidal wave, and the winding of the stator is also distributed to the sinusoidal wave in the distribution range to have the best efficiency.

이상에서 설명한 종래 기술에 따른 냉장고 압축기의 영구자석 동기 전동기 구동방법은 다음과 같은 문제점이 있다.The permanent magnet synchronous motor driving method of the refrigerator compressor according to the related art described above has the following problems.

첫째, 영구자석 동기 전동기를 BLDCM 방식으로 구동할 경우 정밀한 권선 및 영구자석 제작이 어려우며 또한, 영구자석 동기 전동기를 PMSM 방식으로 구동할 경우에도 스테이터(stator)의 권선 분포권으로 인한 비용이 상승하는 문제점이 있다.First, when the permanent magnet synchronous motor is driven by the BLDCM method, it is difficult to produce precise windings and permanent magnets. Also, when the permanent magnet synchronous motor is driven by the PMSM method, the cost of the stator winding distribution range increases. have.

둘째, 영구자석 동기 전동기를 속도(rpm)에 관계없이 동일한 정현파 또는 구형파 만으로 구동시킴으로써 해당 전동기의 효율을 저하시킨다.Second, by driving the permanent magnet synchronous motor with only the same sinusoidal or square wave regardless of the speed (rpm), the efficiency of the motor is reduced.

따라서 본 발명은 상기와 같은 문제점을 해결하기 위해 안출한 것으로서, 소정 구동 대역별에 따라 정현파 및 구형파로 영구자석 동기 전동기의 모터를 구동시키기 위한 냉장고 압축기의 영구자석 동기 전동기 구동방법을 제공하는데 그 목적이 있다.Accordingly, an object of the present invention is to provide a permanent magnet synchronous motor driving method of a refrigerator compressor for driving a motor of a permanent magnet synchronous motor with a sine wave and a square wave according to a predetermined driving band. There is this.

도 1은 본 발명에 따른 냉장고 압축기의 영구자석 동기 전동기 구동방법을 나타낸 플로우 차트1 is a flowchart illustrating a method of driving a permanent magnet synchronous motor of a refrigerator compressor according to the present invention.

도 2는 본 발명에 따른 냉장고 압축기의 영구자석 동기 전동기 구동방법에서 고속/저속에 따른 구동 파형을 나타낸 도면2 is a view showing a driving waveform according to the high speed / low speed in the permanent magnet synchronous motor driving method of the refrigerator compressor according to the present invention

상기와 같은 목적을 달성하기 위한 본 발명에 따른 냉장고 압축기의 영구자석 동기 전동기 구동방법은 냉장고용 압축기에서 사용되는 영구자석 동기 전동기의 모터 구동방법에서, 현재 모터의 구동속도가 설정속도(rpm) 이상인지 여부를 판단하는 단계와, 모터의 구동속도가 설정속도(rpm) 이상이 되면 구형파로 모터를 구동하는 단계와, 모터의 구동속도가 설정속도 미만이면 정현파로 모터를 구동하는 단계를 포함하여 이루어지는데 그 특징이 있다.Permanent magnet synchronous motor driving method of the refrigerator compressor according to the present invention for achieving the above object, in the motor driving method of the permanent magnet synchronous motor used in the refrigerator compressor, the current drive speed of the motor is higher than the set speed (rpm) And determining whether the driving speed is greater than or equal to the set speed (rpm), and if the driving speed of the motor is less than the set speed, driving the motor with a sine wave. It is characterized by building.

이하, 첨부된 도면을 참조하여 본 발명에 따른 냉장고 압축기의 영구자석 동기 전동기 구동방법을 설명하면 다음과 같다.Hereinafter, a permanent magnet synchronous motor driving method of a refrigerator compressor according to the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명에 따른 냉장고 압축기의 영구자석 동기 전동기 구동방법을 나타낸 플로우 차트이고, 도 2는 본 발명에 따른 냉장고 압축기의 영구자석 동기전동기 구동방법에서 고속/저속에 따른 구동 파형을 나타낸 도면이다.1 is a flowchart illustrating a method of driving a permanent magnet synchronous motor of a refrigerator compressor according to the present invention, and FIG. 2 is a view illustrating a drive waveform according to high speed / low speed in a method of driving a permanent magnet synchronous motor of a refrigerator compressor according to the present invention. .

도 1 에 도시된 바와 같이, 본 발명에 따른 냉장고 압축기의 영구자석 동기 전동기 구동방법은 먼저, 현재 상기 영구자석 동기 전동기(도시생략)의 모터(도시생략) 구동속도가 설정속도(1800 ~ 3600 rpm 중 하나, 예를 들어 2700 rpm) 이상인지 여부를 판단한다(S10).As shown in Figure 1, the permanent magnet synchronous motor driving method of the refrigerator compressor according to the present invention, first, the motor (not shown) driving speed of the permanent magnet synchronous motor (not shown) is set speed (1800 ~ 3600 rpm) It is determined whether or not, for example, 2700 rpm or more (S10).

여기서 상기 모터의 구동속도 즉, 고속/저속은 해당 모터를 구비한 냉장고의 고내온도와 설정온도 차에 따라 결정된다.Here, the driving speed of the motor, that is, high speed / low speed, is determined according to the difference between the internal temperature of the refrigerator equipped with the motor and the set temperature.

즉, 상기 고내온도와 설정온도 차가 소정 레벨 이상으로 크면, 상기 냉장고의 고내온도를 설정온도로 유지시키기 위해 급속한 냉각이 이루어지도록 해당 냉장고의 모터를 고속으로 구동시킨다.That is, when the difference between the inside temperature and the set temperature is greater than a predetermined level, the motor of the refrigerator is driven at a high speed so that rapid cooling is performed to maintain the inside temperature of the refrigerator at the set temperature.

이때, 상기 모터의 구동속도가 설정속도(2700 rpm) 이상이 되면, 해당 모터는 고속 구동되므로 도 2에 도시된 바와 같이, 구형파로 상기 모터를 구동시킨다(S20).At this time, when the driving speed of the motor is more than the set speed (2700 rpm), the motor is driven at high speed, as shown in Figure 2, to drive the motor with a square wave (S20).

이어서 상기 모터를 고속 구동하여 해당 고내온도가 설정온도로 유지되어 상기 고내온도와 설정온도 차가 소정 레벨 이하로 작아지면 상기 모터를 저속 구동시킨다.Subsequently, the motor is driven at high speed so that the inside temperature is maintained at the set temperature, and the motor is driven at a low speed when the difference between the inside temperature and the set temperature becomes smaller than a predetermined level.

이때, 상기 모터의 구동속도가 설정속도(2700 rpm) 이하가 되면, 해당 모터에 정현파를 인가하여 구동시킨다(S30).At this time, when the driving speed of the motor is less than the set speed (2700 rpm), by applying a sine wave to the motor to drive (S30).

이상에서 설명한 바와 같은 본 발명에 따른 냉장고 압축기의 영구자석 동기전동기 구동방법은 소정 구동 대역 즉, 고속/저속 구동대역에 따라 구형파 및 정현파로 전동기의 모터를 구동시키므로 소음을 최소화시키고, 모터의 구동 효율을 극대화시킬 수 있다.As described above, the permanent magnet synchronous motor driving method of the refrigerator compressor according to the present invention drives the motor of the motor with a square wave and a sine wave according to a predetermined driving band, that is, a high speed / low speed driving band, thereby minimizing noise and driving efficiency of the motor. Can be maximized.

Claims (2)

냉장고용 압축기에서 사용되는 영구자석 동기 전동기의 모터 구동방법에서,In the motor driving method of a permanent magnet synchronous motor used in a refrigerator compressor, 현재 상기 모터의 구동속도가 설정속도(rpm) 이상인지 여부를 판단하는 단계,Determining whether a driving speed of the motor is equal to or greater than a set speed (rpm); 상기 모터의 구동속도가 설정속도(rpm) 이상이 되면, 구형파로 상기 모터를 구동하는 단계,Driving the motor with a square wave when the driving speed of the motor is equal to or greater than a set speed (rpm), 상기 모터의 구동속도가 설정속도 미만이면, 정현파로 상기 모터를 구동하는 단계를 포함하여 이루어짐을 특징으로 하는 냉장고 압축기의 영구자석 동기 전동기 구동방법.If the drive speed of the motor is less than the set speed, the permanent magnet synchronous motor driving method of the refrigerator compressor characterized in that it comprises a step of driving the motor in a sine wave. 제 1 항에 있어서,The method of claim 1, 상기 설정속도(rpm)는 1800 rpm 내지 3600 rpm 범위 중 하나의 rpm 값임을 특징으로 하는 냉장고 압축기의 영구자석 동기 전동기 구동방법.The set speed (rpm) is a permanent magnet synchronous motor driving method of the refrigerator compressor, characterized in that one of the rpm value of 1800 rpm to 3600 rpm range.
KR1020000075634A 2000-12-12 2000-12-12 Method for driving PMSM of refrigerator compressor KR20020046314A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190076495A (en) * 2017-12-22 2019-07-02 (주)모토닉 Fuel pump motor control apparatus and method
KR20210003484A (en) * 2019-07-02 2021-01-12 엘지전자 주식회사 Motor driving apparatus and method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190076495A (en) * 2017-12-22 2019-07-02 (주)모토닉 Fuel pump motor control apparatus and method
KR20210003484A (en) * 2019-07-02 2021-01-12 엘지전자 주식회사 Motor driving apparatus and method thereof

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