Field weakening control system and method for PMSM, refrigerator controller and refrigerator

A permanent magnet synchronous motor, field weakening control technology, applied in the control system, vector control system, motor generator control and other directions, to reduce fluctuations, speed up, reduce speed fluctuations

Active Publication Date: 2017-02-22
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the deficiencies in the field weakening control of permanent magnet synchronous motors in the prior art, there is no effective solution to this problem in the art

Method used

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  • Field weakening control system and method for PMSM, refrigerator controller and refrigerator
  • Field weakening control system and method for PMSM, refrigerator controller and refrigerator
  • Field weakening control system and method for PMSM, refrigerator controller and refrigerator

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Embodiment Construction

[0048] The first aspect of the present invention provides a field-weakening control system for a permanent magnet synchronous motor, which is used for vector control of the permanent magnet synchronous motor to reduce the speed fluctuation of the motor near the frequency point where the field weakening is enabled. Such as figure 1 As shown, the control system includes a speed loop and a current loop, where the output of the speed loop is the given input of the current loop, and the output of the current loop is the d-axis voltage given value V dref and q-axis voltage given value V qref .

[0049] The control system also includes PMSM (i.e. permanent magnet synchronous motor) 1, inverter circuit 2, SVPWM (i.e. space vector pulse width modulator) 3, Park inverter 4, Clarke converter 5, Park converter 6, And the rotation speed angle acquisition module 7. Among them, the three-phase current I of the permanent magnet synchronous motor 1 in the three-phase stationary coordinate s...

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Abstract

The invention provides a field weakening control system and method for a PMSM (Permanent Magnet Synchronous Motor). The field weakening control system and method for a PMSM are used for performing vector control on the PMSM. The field weakening control system includes a rotating speed loop and an electric current loop, wherein output of the rotating speed loop is the given input of the electric current loop; and output of the electric current loop is a d shaft voltage given value Vdref and a q shaft voltage given value Vqref. The field weakening control system also includes a filed weakening angle loop, wherein the field weakening angle loop calculates a field weakening angle Beta according to the output of the electric current loop and a field weakening gain K, and determines the angle of a motor d shaft current given value I*dref and the angle of a q shaft current given value I*qref according to the field weakening angle Beta. The field weakening control system and method for a PMSM can reduce the fluctuation of rotating speed of the PMSM at frequency points opening field weakening. The invention also provides a refrigerator controller and a refrigerator.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a field weakening control system and method for a permanent magnet synchronous motor. The invention also relates to a refrigerator controller and a refrigerator. Background technique [0002] In the refrigerator system where the compressor uses a permanent magnet synchronous motor, there is a common problem of large speed fluctuations near the frequency point of field weakening. Limited by the deficiencies in the field weakening control of permanent magnet synchronous motors in the prior art, there is no effective solution to this problem in the art. [0003] For the refrigerator system, under different working conditions, the frequency points of magnetic field weakening are different, and because of the variety of refrigerator systems, the operating frequency of its power consumption (i.e. The frequency point with the least power consumption under a certain working condi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/22H02P21/08H02P21/18
CPCH02P21/0003H02P21/08
Inventor 韩利利王长恺苏勇雪
Owner GREE ELECTRIC APPLIANCES INC
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