KR20120011824A - Electric motor system - Google Patents

Electric motor system Download PDF

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Publication number
KR20120011824A
KR20120011824A KR1020110075102A KR20110075102A KR20120011824A KR 20120011824 A KR20120011824 A KR 20120011824A KR 1020110075102 A KR1020110075102 A KR 1020110075102A KR 20110075102 A KR20110075102 A KR 20110075102A KR 20120011824 A KR20120011824 A KR 20120011824A
Authority
KR
South Korea
Prior art keywords
motor
control circuit
electric motor
voltage
inverter
Prior art date
Application number
KR1020110075102A
Other languages
Korean (ko)
Inventor
치 핑 선
지오 바오 왕
하이 보 장
Original Assignee
존슨 일렉트릭 에스.에이.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 존슨 일렉트릭 에스.에이. filed Critical 존슨 일렉트릭 에스.에이.
Publication of KR20120011824A publication Critical patent/KR20120011824A/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
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/04—Arrangements for controlling or regulating the speed or torque of more than one motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/08—Arrangements for controlling the speed or torque of a single motor
    • H02P6/085—Arrangements for controlling the speed or torque of a single motor in a bridge configuration
    • 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
    • H02P2209/00—Indexing scheme relating to controlling arrangements characterised by the waveform of the supplied voltage or current
    • H02P2209/09—PWM with fixed limited number of pulses per period
    • 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
    • H02P2209/00—Indexing scheme relating to controlling arrangements characterised by the waveform of the supplied voltage or current
    • H02P2209/11—Sinusoidal waveform
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S388/00—Electricity: motor control systems
    • Y10S388/907—Specific control circuit element or device
    • Y10S388/9072—Bridge circuit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S388/00—Electricity: motor control systems
    • Y10S388/907—Specific control circuit element or device
    • Y10S388/912—Pulse or frequency counter

Abstract

PURPOSE: An electric motor system is provided to control driving voltage supplied to a motor according to motor load change, thereby guaranteeing high efficiency. CONSTITUTION: An electric motor system comprises a first electric motor(10), a second electric motor(20), and a control circuit(30). The control circuit is shared by the first electric motor and the second electric motor. A permanent magnet rotor and a stator coil which generates a magnetic field while being charged are included in the first electric motor and the second electric motor. The control circuit controls a synchronous mode of a brushless motor in order to rotate the rotor. The control circuit alternatively controls the first electric motor and the second electric motor. A switching unit(40) includes a switching unit which is connected between the first and second electric motors and the control circuit.

Description

Electric motor system {ELECTRIC MOTOR SYSTEM}

The present invention relates to a control circuit for a permanent magnet brushless motor, and more particularly to a household appliance having at least two pumps.

US2010 / 0186787 discloses a dishwasher having at least one conveying unit for conveying the washing liquid. The transfer unit has a first pump and a second pump each having a permanent magnet brushless motor. Shared control circuit electronics are provided for the first and second pumps of the transfer unit. The control circuit electronics are configured to detect the position of the motor rotor to match the commutation timing and to detect the rotational speed of the rotor to change the direction of rotation of the rotor when the detected speed deviates from the preset speed. In this application, the motor is characterized by increasing the rotor speed while increasing the torque of the motor. In addition, when the frequency of the voltage output by the inverter of the control circuit electronic device and the motor speed have a constant proportional relationship, the motor is also characterized in that the motor speed changes with the change of frequency. When detection of the position and speed of the rotor becomes necessary, the control circuit electronics become complicated and expensive.

The present invention provides a simpler and lower cost control method.

Thus, in a first configuration, the present invention includes a first electric motor, a second electric motor, and a control circuit shared by the first motor and the second motor, wherein at least one of the first motor and the second motor, A permanent magnet brushless motor comprising a permanent magnet rotor and a stator having a stator winding that generates a rotating magnetic field during charging; The control circuit provides an electric motor system, configured to control the brushless motor to operate in a synchronous mode such that the rotor rotates in synchronization with the magnetic field of the stator.

Preferably, the control circuit is configured to alternately control the first motor and the second motor.

Preferably, the system further comprises a switching unit connected between the control circuit and the two motors.

Preferably, the control circuit comprises an inverter for driving the first motor and the second motor and a logic control unit configured to output a PWM signal to the inverter to output the sine wave type drive voltage having a fixed frequency. do.

Preferably, the control circuit further comprises a detection unit for detecting a load change of the brushless motor and a voltage adjusting unit for adjusting the power supplied to the brushless motor when the load changes.

Preferably, the voltage adjusting unit is configured to increase the driving voltage when the load on the brushless motor increases and to decrease the driving voltage when the load on the brushless motor decreases.

Preferably, the detection unit is configured to detect the load variation by detecting the current passing through the brushless motor.

Preferably, the voltage adjusting unit is configured to adjust the driving voltage by adjusting the duty cycle of the PWM signal.

According to a second configuration, the present invention also relates to a first pump, a second pump, a first motor for driving the first pump, a second motor for driving the second pump, and a first motor and a second motor. A control circuit shared by: at least one of the first motor and the second motor is a permanent magnet brushless motor comprising a permanent magnet rotor and a stator having a stator winding that generates a rotating magnetic field during charging; The control circuit provides a household appliance configured to control the brushless motor to operate in a synchronous mode such that the rotor rotates in synchronization with the stator's magnetic field.

Preferably, the control circuit comprises an inverter for driving the first motor and the second motor and a logic control unit configured to output a PWM signal to the inverter to output the sine wave type drive voltage having a fixed frequency. do.

Preferably, the control circuit is configured to increase the drive voltage when the load of the brushless motor and the detection unit for detecting the load variation of the brushless motor increases, and to reduce the drive voltage when the load of the brushless motor decreases. It further comprises a voltage adjusting unit configured to.

According to a third configuration, the present invention also provides an electric motor system comprising: a permanent magnet brushless motor comprising a permanent magnet rotor and a stator having a stator winding that generates a rotating magnetic field during charging; And a control circuit for driving the brushless motor, wherein the control circuit is configured to control the brushless motor to operate in the synchronous mode such that the rotor rotates in synchronization with the magnetic field of the stator.

Preferably, the control circuit comprises a logic control unit configured to output an inverter and a PWM signal to the inverter so that the inverter outputs a sinusoidal type drive voltage having a fixed frequency.

Preferably, the control circuit is configured to increase the driving voltage when the load on the brushless motor and the detection unit for detecting the load variation of the brushless motor increases, and to reduce the driving voltage when the load on the brushless motor decreases. It further comprises a voltage adjusting unit configured to.

In embodiments of the present invention, since the first motor and the second motor share a control circuit, the circuit cost is low. Secondly, since the permanent magnet brushless motor is controlled to operate in synchronous mode and no detection of the position and speed of the rotor is required, the control circuit is simpler and less expensive. Third, high efficiency is ensured by adjusting the drive voltage supplied to the motor in accordance with the load variation of the motor.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the invention will now be described with reference to the accompanying drawings by way of example only. In the drawings, the same structures, elements, or parts shown in more than one figure are generally denoted by the same reference numerals in all the figures in which they are shown. Dimensions of components and features shown in the figures are generally selected for convenience and clarity of presentation and are not necessarily drawn to actual scale. The drawings are as follows.

1 is a block diagram of a dish washing machine according to a preferred embodiment of the present invention.
2 is a block diagram of the electric motor system of the dish washing machine of FIG.

The dishwasher 50 according to the preferred embodiment of the present invention includes a tub, a plurality of wash arms in the tub, a plurality of spray outlets of the washing arm, and a water supply for supplying water to the tub. A system and a sump that collects water from the tub, which components are known to those skilled in the art and are not shown in the drawings. The dishwasher is a washing pump 52 for supplying water from the sump to the washing arm, a drainage system having a drain pump 54 for discharging waste water, and an electric motor system, the first electric motor driving the washing pump 52. 10, a second electric motor 20 for driving the drain pump 54, a control circuit 30 and a control circuit 30 shared by the first motor 10 and the second motor 20, It further comprises an electric motor system comprising a switching unit 40 connected between the motors 10, 20.

Each of the motors 10 and 20 is a three-phase permanent magnet brushless motor having a stator with a permanent magnet rotor and stator windings.

The control circuit 30 includes an inverter 32, a voltage regulation unit 33, a logic control unit 34 and a detection unit 35.

The switching unit 40 is connected between the inverter 32 and the two motors 10 and 20, and the first motor 10 or the second motor 20 is connected to the inverter 32 so that the washing pump 52 or It is controlled to operate the drain pump 54.

Inverter 32 drives motors 10 and 20 and is powered by power source 31, which may be a stable DC voltage generated from an AC voltage. Inverter 32 may be a bridge circuit with multiple switches. The inverter 32 converts the DC voltage into an AC voltage of a fixed frequency, which is supplied to the stator windings to generate a rotating magnetic field at a constant speed in the stator.

The logic control unit 34 outputs the PWM signal to the inverter 32 to control the switch of the inverter 32 so that the inverter 32 outputs an alternating voltage.

In this embodiment, the fixed frequency is a preset value. After the motor starts, the inverter 32 outputs a fixed frequency three-phase sine wave type driving voltage to drive the motor to operate in a synchronous mode. In the present invention, the fact that it operates in the synchronous mode means that the rotor of the motor rotates synchronously with the rotating magnetic field of the stator and rotates at a constant speed. In this mode, the rotor follows the rotation of the stator magnetic field, and the speed of the rotor does not change even if the load of the motor changes, i.e., the motor has the characteristic that the speed remains constant with torque fluctuations. That is, since the frequency of the drive voltage provided by the inverter 32 to the stator winding is fixed, the rotational speed of the stator magnetic field is fixed and the rotor speed is also fixed.

The detection unit 35 detects a load change of the motor by detecting a current passing through the stator winding.

The voltage adjusting unit 33 adjusts the power cycle supplied to the motor by adjusting the duty cycle of the PWM signal output by the logic control unit 34 when the motor load changes, thereby preventing the motor from being out of synchronization and improving motor efficiency. Keep it at a relatively high level. In particular, the voltage adjusting unit 33 is configured to cause the driving voltage supplied to the motor to increase when the load of the motor increases, and to reduce this driving voltage when the load of the motor decreases.

In this embodiment, the permanent magnet brushless motor can be controlled to operate at a constant speed without detecting the position or speed of the rotor, making the control circuit simpler and cheaper.

In the description and claims of this application, the verbs, “comprise, include, contain” and “have” and their derivatives, specify the presence of the items mentioned, but the presence of additional items. It is used in a comprehensive sense so as not to exclude it.

Although the present invention has been described with reference to one or more preferred embodiments, it should be understood by those skilled in the art that various modifications are possible. Therefore, the scope of the invention should be determined with reference to the following claims.

For example, an electric motor system may have two or more different motors, where some of these motors are permanent magnet brushless motors. In addition, the control circuit can control two or more permanent magnet brushless motors to operate in the synchronous mode, respectively, at the same frequency or at different frequencies.

Claims (14)

A first electric motor 10, a second electric motor 20, and a control circuit 30 shared by the first motor 10 and the second motor 20, the first motor 10. At least one of the second motor (20) is a permanent magnet brushless motor comprising a permanent magnet rotor and a stator having a stator winding that generates a rotating magnetic field during charging;
The control circuit (30) is configured to control the brushless motor to operate in a synchronous mode such that the rotor rotates in synchronization with the magnetic field of the stator. 2. The electric motor system of claim 1, wherein the control circuit (30) is configured to alternately control the first motor (10) and the second motor (20). 3. The electric motor system of claim 2, further comprising a switching unit (40) connected between the control circuit (30) and the two motors (10, 20). 2. The inverter of claim 1, wherein the control circuit 30 outputs an inverter 32 and a PWM signal for driving the first motor 10 and the second motor 20 to the inverter 32. And a logic control unit (34) configured to output a sinusoidal type driving voltage having a fixed frequency. 5. The control circuit 30 according to claim 4, wherein the control circuit 30 includes a detection unit 35 for detecting a load change of the brushless motor and a voltage adjustment for adjusting the power supplied to the brushless motor when the load changes. An electric motor system, further comprising a unit (33). The voltage regulating unit (33) according to claim 5, wherein the voltage adjusting unit (33) is configured to increase the driving voltage when the load on the brushless motor increases, and decrease the driving voltage when the load on the brushless motor decreases. Electric motor system. 6. The electric motor system of claim 5, wherein the detection unit is configured to detect a load change by detecting a current passing through the brushless motor. 6. The electric motor system according to claim 5, wherein the voltage adjustment unit (33) is configured to adjust the drive voltage by adjusting the duty cycle of the PWM signal. A first pump 52, a second pump 54, a first motor 10 for driving the first pump 52, a second motor 20 for driving the second pump 54, And a control circuit 30 shared by the first motor 10 and the second motor 20.
At least one of the first motor 10 and the second motor 20 is a permanent magnet brushless motor including a permanent magnet rotor and a stator having a stator winding that generates a rotating magnetic field during charging,
The control circuit (30) is configured to control the brushless motor to operate in a synchronous mode such that the rotor rotates in synchronization with the magnetic field of the stator. The inverter circuit of claim 9, wherein the control circuit 30 outputs an inverter 32 and a PWM signal for driving the first motor 10 and the second motor 20 to the inverter 32. And a logic control unit (34) configured to output a sinusoidal type driving voltage having a fixed frequency. The control circuit 30 according to claim 10, wherein the control circuit 30 increases the driving voltage when the load on the detection unit 35 and the brushless motor for detecting the load variation of the brushless motor increases, and the brushless. Further comprising a voltage adjusting unit (33) configured to reduce the drive voltage when the load on the motor is reduced. Electric motor system,
A permanent magnet brushless motor (10, 20) comprising a permanent magnet rotor and a stator having a stator winding that generates a rotating magnetic field during charging; And
A control circuit 30 for driving the brushless motor,
The control circuit (30) is configured to control the brushless motor to operate in a synchronous mode such that the rotor rotates in synchronization with the magnetic field of the stator. 13. The control circuit of claim 12, wherein the control circuit 30 is configured to output an inverter 32 and a PWM signal to the inverter 32 so that the inverter 32 outputs a sine wave type drive voltage having a fixed frequency. An electric motor system comprising a logic control unit (34). The control circuit 30 according to claim 13, wherein the control circuit 30 increases the driving voltage when the load on the detection unit 35 and the brushless motor for detecting the load variation of the brushless motor increases, and the brushless And a voltage adjusting unit (33) configured to reduce the drive voltage when the load on the motor decreases.
KR1020110075102A 2010-07-28 2011-07-28 Electric motor system KR20120011824A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201020039681 2010-07-28
CN201010239681.9 2010-07-28

Publications (1)

Publication Number Publication Date
KR20120011824A true KR20120011824A (en) 2012-02-08

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Application Number Title Priority Date Filing Date
KR1020110075102A KR20120011824A (en) 2010-07-28 2011-07-28 Electric motor system

Country Status (1)

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KR (1) KR20120011824A (en)

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