KR20120011824A - Electric motor system - Google Patents
Electric motor system Download PDFInfo
- 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
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Classifications
-
- 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
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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
- H02P6/08—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
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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
- 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
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
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
Each of the
The
The
Inverter 32
The
In this embodiment, the fixed frequency is a preset value. After the motor starts, the
The
The
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)
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.
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.
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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201010239681.9 | 2010-07-28 | ||
CN201020039681 | 2010-07-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20120011824A true KR20120011824A (en) | 2012-02-08 |
Family
ID=45835940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020110075102A KR20120011824A (en) | 2010-07-28 | 2011-07-28 | Electric motor system |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR20120011824A (en) |
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2011
- 2011-07-28 KR KR1020110075102A patent/KR20120011824A/en not_active Application Discontinuation
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