Permanent magnet synchronous motor system and its field weakening control method and device

A permanent magnet synchronous motor and field weakening control technology, applied in the direction of motor generator control, AC motor control, control of electromechanical transmission devices, etc. Instability, performance improvement effect

Active Publication Date: 2019-09-27
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing problem is that the limitation of the D-axis voltage results in poor tracking of the field-weakening current (D-axis current), which affects the field-weakening control performance.

Method used

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  • Permanent magnet synchronous motor system and its field weakening control method and device
  • Permanent magnet synchronous motor system and its field weakening control method and device
  • Permanent magnet synchronous motor system and its field weakening control method and device

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Embodiment Construction

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0038] The field weakening control method of the permanent magnet synchronous motor system, the field weakening control device of the permanent magnet synchronous motor system and the permanent magnet synchronous motor system according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0039] figure 1 It is a flowchart of a field weakening control method for a permanent magnet synchronous motor system according to an embodiment of the present invention. Such as fig...

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Abstract

The present invention discloses a permanent magnet synchronous motor system, a field weakening control method and device thereof. The method comprises the following steps that: the D-axis output voltage ud and Q-axis output voltage uq of the permanent magnet synchronous motor system under a rotating coordinate system are acquired; an output voltage limit threshold value is acquired, and a Q-axis voltage limit threshold value is acquired according to the D-axis output voltage and the output voltage limit threshold value; and field weakening current is generated according to the Q-axis output voltage uq and the Q-axis voltage limit threshold value, and the field weakening current is superimposed onto the D-axis current closed loop of the permanent magnet synchronous motor system, so that field weakening control can be performed on the permanent magnet synchronous motor. Since field weakening control fed-back by the closed-loop is performed through using Q-axis voltage error, and the full tracking of the D-axis current is maintained, the instability of the D-axis current under a condition of input alternating-current voltage periodic fluctuation and load fluctuation can be avoided, and field weakening control performance can be improved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a field-weakening control method for a permanent magnet synchronous motor system, a field-weakening control device for a permanent magnet synchronous motor system, and a permanent magnet synchronous motor system. Background technique [0002] Permanent magnet synchronous motors have been widely used in various industries due to their good control performance, high power density, and energy saving. Among them, in many applications, permanent magnet synchronous motors are required to operate in the high frequency range, and then run in the field weakening range, such as variable frequency compressors based on permanent magnet synchronous motors, fans based on permanent magnet synchronous motors, etc. [0003] Most of the field-weakening control methods in the related art adopt the closed-loop feedback of the output voltage amplitude to adjust the field-weakening current. How...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/22H02P21/28H02P27/12
Inventor 黄招彬
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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