Permanent magnet synchronous motor system, field weakening control method and device thereof

A permanent magnet synchronous motor and field-weakening control technology, which is applied in the direction of motor generator control, AC motor control, and electromechanical transmission control. Unstable, performance-improving effects

Active Publication Date: 2017-05-24
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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Problems solved by technology

However, the existing problem is that the limitation of the D-axis voltage results in poor tracking o

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

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[0037] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0038] The following describes 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 with reference to the accompanying drawings.

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

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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...

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Application Information

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IPC IPC(8): H02P21/22H02P21/28H02P27/12
Inventor 黄招彬
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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