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

A permanent magnet synchronous motor and field-weakening control technology, which is applied in the direction of motor generator control, electromechanical transmission control, electronic commutation motor control, etc., can solve the problems of poor field-weakening current tracking and affecting the performance of field-weakening control. Achieve the effect of improving the field weakening control performance and avoiding instability

Active Publication Date: 2019-01-22
GD MIDEA AIR CONDITIONING EQUIP CO LTD
View PDF5 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] 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.

[0030] 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.

[0031] 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a permanent magnet synchronous motor system and a field-weakening control method and device thereof. The method comprises the following steps of obtaining D-axis output voltage ud and Q-axis output voltage uq under a rotating coordinate system of the permanent magnet synchronous motor system; obtaining DC bus voltage of the permanent magnet synchronous motor system and obtaining a Q-axis voltage limit threshold according to the D-axis output voltage ud, the Q-axis output voltage uq and the DC bus voltage; and generating field-weakening current according to the Q-axis output voltage uq and the Q-axis voltage limit threshold and superimposing the field-weakening current to a D-axis current closed loop of the permanent magnet synchronous motor system to carry out field-weakening control on a permanent magnet synchronous motor. Therefore, closed-loop feedback field-weakening control is carried out by adopting a Q-axis voltage error, complete tracking of D-axis current is kept, the condition that the D-axis current is unstable under the conditions of periodic fluctuation characteristics of input AC voltage and load fluctuation can be avoided and the field-weakening control performance is 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P21/22
CPCH02P21/14
Inventor 黄招彬
Owner GD MIDEA AIR CONDITIONING EQUIP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap