Device and method for permanent magnet synchronous motor back electromotive force balance adjusting
A permanent magnet synchronous motor, back electromotive force technology, applied in the direction of electronic commutation motor control, electrical components, control systems, etc., can solve problems such as stator winding neutral point imbalance, avoid neutral point imbalance, avoid interference , The effect of eliminating back EMF deviation
Active Publication Date: 2018-11-23
ZHEJIANG DONGFANG ELECTROMECHANICAL
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[0005] Another object of the present invention is to provide a permanent magnet synchronous motor counter electromotive force balancing device and method, the present invention effectively solves the neutral point imbalance problem of the stator winding caused by the three-phase opposite electromotive force deviation of the permanent magnet synchronous motor
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[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.
[0035] It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.
[0036] Such as Figure 1-3 As shown, the present invention provides a permanent magnet synchronous motor back electromotive force balancing device, including: an inverter circuit, an absorbing circuit and a controller.
[0037] The inverter circuit is composed of three pairs of upper and lower bridge arms. The inverter circuit is a three-phase full-bridge inverter. Each bridge arm is provided with a reverse diode D. The output end of the inverter circuit is connected to the permanent magnet synchronous The three-phase stator winding of the motor;
[0038] The first end of the a...
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The invention discloses a device and method for a permanent magnet synchronous motor back electromotive force balance adjusting, comprising the following steps: calculating the size of the back electromotive force of each phase; judging deviations and deviation directions of a three back electromotive force; judging the phase where the back electromotive force is larger than the back electromotiveforce according to the deviation direction; calculating a deviation amount of back electromotive force on the phase according to the back electromotive force deviation amount; starting from the period when the phase stator are wound on the next exchange period; and decreasing the switching frequency of the seventh switch Tq according to the deviation amount of the back electromotive force on thephase stator; the following operations are carried out on the phase exchange process of the phase where the back electromotive force is large: when the phase winding of the phase is in the next phaseexchange period, if the corresponding upper arm was turned on and the lower arm was turned off, the delay time of the lower arm is turned off by 0.01T; and if the corresponding upper arm was turned off and the lower arm was turned on, the timing of the closing of the upper arm is delayed by 0.01T. The device and the method in the invention solves the problem of neutral point imbalance problem in stator windings which caused by the permanent magnet synchronous motor three-phase back electromotive force deviation effectively.
Description
technical field [0001] The present invention relates to the technical field of control of permanent magnet synchronous motors, and more specifically, the present invention relates to a device and method for adjusting and balancing counter electromotive force of permanent magnet synchronous motors. Background technique [0002] In recent years, with the rapid development of power electronics technology, microelectronics technology, new motor control theory and rare earth permanent magnet materials, permanent magnet synchronous motors have been rapidly popularized and applied. Compared with the traditional electric excitation synchronous motor, the permanent magnet synchronous motor, especially the rare earth permanent magnet synchronous motor has the advantages of less loss, high efficiency and obvious power saving effect. The permanent magnet synchronous motor provides excitation with permanent magnets, which makes the structure of the motor relatively simple, reduces the co...
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IPC IPC(8): H02P6/182
CPCH02P6/182
Inventor 郑秋吴金富
Owner ZHEJIANG DONGFANG ELECTROMECHANICAL
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