Field weakening control method for permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and field weakening control, which is applied in motor control, motor generator control, AC motor control, etc., and can solve problems such as motor vibration and instability

Active Publication Date: 2020-07-07
SHANGHAI SIGRINER STEP ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In field weakening control (such as no current loop field weakening control and single current loop field weakening control methods), as the field weakening depth deepens (speed increases and load increases), the motor vibration increases and is prone to instability.

Method used

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  • Field weakening control method for permanent magnet synchronous motor
  • Field weakening control method for permanent magnet synchronous motor
  • Field weakening control method for permanent magnet synchronous motor

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] figure 2 A control principle block diagram of a field weakening control method for a permanent magnet synchronous motor according to an embodiment of the present invention is shown. Please refer to figure 2 , according to an embodiment of the present invention, a permanent magnet synchronous motor field weakening control method and figure 1 Compared with the existing permanent magnet synchronous motor field weakening control method shown in , the main difference is that the addition of i q high frequency compensation, that is figure 2 The part shown in the dotted box.

[0016] Specifically, the field weakening control method for a permanent magnet synchronous motor according to an embodiment of the present invention includes the following steps:

[0017] Step a. Obtain the d-axis output voltage U through no-current-loop field-weakening control d0 "and q...

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Abstract

The invention discloses a field-weakening control method for a permanent magnet synchronous motor, and the method comprises the steps: a, obtaining a d-axis output voltage Ud0'' and a q-axis output voltage Uq0'' through no-current-loop field-weakening control or single-current-loop field-weakening control; b, adding a high-frequency q-axis compensation current iq'' to the q-axis output voltage Uq0'', so as to reduce the ripple current in an actual q-axis current iq of the permanent magnet synchronous motor. In the field-weakening operation, the method achieves the compensation for a high-frequency quadrature axis current in the q-axis output voltage, reduces the current ripples of the actual q-axis current iq of the permanent magnet synchronous motor and the motor vibration, and improves the operation stability of the motor.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a field weakening control method for a permanent magnet synchronous motor. Background technique [0002] In the existing vector control method for permanent magnet synchronous motors, as the motor speed increases, the required output voltage of the power converter increases linearly. However, the output voltage of the power converter is limited. When the motor control demand voltage exceeds the voltage of the power converter, field weakening control is required. However, in field weakening control (such as methods such as no current loop field weakening control and single current loop field weakening control), as the depth of field weakening deepens (increase in speed and load), the motor vibration increases and is prone to instability. . [0003] figure 1 It shows a control principle block diagram of an existing motor controller performing non-current loop field weakening cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/05H02P21/22H02P25/024H02P27/08
CPCH02P21/0089H02P21/22H02P25/024H02P25/03H02P27/08H02P2205/01H02P2207/055
Inventor 金辛海陈伟曾彦能
Owner SHANGHAI SIGRINER STEP ELECTRIC
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