Flux weakening control method for permanent magnet synchronous motor based on table lookup mode

A permanent magnet synchronous motor and field-weakening control technology, applied in motor control, AC motor control, current controller, etc., can solve the problems of bus voltage dependence, inaccurate current command, and poor torque control accuracy, etc., to achieve The effect of comprehensive control, less storage space, and less table data

Active Publication Date: 2018-08-10
江西精骏电控技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 1. The current command is inaccurate, and the torque control accuracy is poor; 2. It takes up too much memory; 3. It is dependent on the bus voltage

Method used

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  • Flux weakening control method for permanent magnet synchronous motor based on table lookup mode
  • Flux weakening control method for permanent magnet synchronous motor based on table lookup mode
  • Flux weakening control method for permanent magnet synchronous motor based on table lookup mode

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Embodiment Construction

[0067]The specific implementation of the present invention will be described in further detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions of the present invention.

[0068] The invention is a field-weakening control method of a permanent magnet synchronous motor based on a look-up table. In order to solve the problems existing in the prior art and overcome its defects, realize the purpose of improving the accuracy of the given direct-axis current and quadrature-axis current, and realize the precise control of the torque of the permanent magnet synchronous machine, such as Figure 1 to Figure 3 Shown, the design idea of ​​the present invention is as follows:

[0069] (1), table design ideas and the use of a table to complete the interpolation method of different voltages;

[0070] (2), the way o...

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Abstract

The invention discloses a flux weakening control method for a permanent magnet synchronous motor based on a table lookup mode, a current instruction table design method, an interpolation method for completing different voltages by using one table, a mode adopted by table lookup for improving the precision and a regional processing mode for different operation intervals. By adopting the technical scheme, the table data is less, and the occupied storage space is less; the table lookup mode can more accurate interpolate a value which does not exist in the table data; and separated processing is performed on operation regions of the motor, so that the control is enabled to be more comprehensive and more accurate.

Description

technical field [0001] The invention belongs to the technical field of motor drive control. More specifically, the present invention relates to a field-weakening control method of a permanent magnet synchronous motor based on a look-up table. Background technique [0002] At present, the field weakening problem of permanent magnet synchronous motor (PMSM) is mainly studied from the perspective of motor design and control strategy. [0003] From the perspective of the motor body structure, some scholars have improved the magnetic field weakening performance of the motor by changing the excitation circuit, bypassing the permanent magnet excitation flux, and adjusting the air gap flux with mixed excitation. Other scholars improve the field-weakening performance of permanent magnet synchronous motors from the perspective of control strategy. [0004] Field weakening control is mostly based on field-oriented control (field-oriented control, FOC) and maximum torque current ratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/00H02P25/022H02P6/28
CPCH02P6/28H02P21/0089H02P21/22H02P25/024H02P2207/05
Inventor 王长江覃云张修武房伟
Owner 江西精骏电控技术有限公司
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