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Permanent magnet synchronous motor control method based on robust fractional order PI strategy

A technology of permanent magnet synchronous motor and control method, which is applied in electric controllers, controllers with specific characteristics, etc., and can solve the problems of small overshoot, inability to effectively determine gain crossover frequency and phase margin, etc.

Inactive Publication Date: 2019-05-24
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the technical defects that the existing methods cannot effectively determine the gain crossover frequency and phase margin, a small overshoot and stable fractional order controller is designed for the permanent magnet synchronous motor system

Method used

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  • Permanent magnet synchronous motor control method based on robust fractional order PI strategy
  • Permanent magnet synchronous motor control method based on robust fractional order PI strategy
  • Permanent magnet synchronous motor control method based on robust fractional order PI strategy

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the accompanying drawings.

[0049] The concrete realization steps of the present invention are as follows:

[0050] Step 1: The voltage characteristic equation and mechanical characteristic equation of the permanent magnet synchronous motor are given as:

[0051]

[0052]

[0053] Among them, u q ,i q is the stator voltage and current of the motor, R, L are the stator resistance and inductance, E is the induced electromotive force, C e is the induced electromotive force coefficient, n is the motor speed, T e is the electromagnetic torque, T L is the load torque, C m is the torque coefficient, i L is the equivalent load current, GD 2 is the flywheel inertia converted to the motor shaft, B m is the friction factor. The two characteristic equations can be attached figure 1 characterization.

[0054]Merge with figure 1 In each module, the transfer function of the permanent magnet sy...

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Abstract

The invention provides a permanent magnet synchronous motor control method based on a robust fractional order PI strategy. According to real root boundary value constraint and sigma stability boundaryvalue constraint of closed-loop poles, the parameter variation range of a fractional order PI controller is acquired when a permanent magnet synchronous motor control system keeps bounded input-bounded output stable; various specific performance indexes can be realized by system output response on the basis of further constraining the parameter variation range according to gain cross-over frequency criteria and phase margin criteria in a frequency domain; finally, system output response overshoot and adjusting time can be kept constant according to phase smoothing criteria, so that robustnessof the permanent magnet synchronous motor control system is ensured.

Description

technical field [0001] The invention relates to a control method of a permanent magnet synchronous motor, in particular to a control method of a permanent magnet synchronous motor based on a robust fractional order PI strategy, and belongs to the category of motion control technology and optimization method. Background technique [0002] For a given stable single-input-single-output control system, the conclusion that fractional-order controllers have better characteristics than integer-order controllers has been demonstrated by a large number of literature studies. In addition, considering the complex characteristics of the permanent magnet synchronous motor system such as multivariable and strong coupling, it can be described more accurately by using the fractional calculus theory. How to design a fractional-order controller to make the system achieve a specific desired performance index has recently received more and more attention as an important topic. [0003] In the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42
Inventor 陈思溢牛旭黄辉先
Owner XIANGTAN UNIV