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Control method and device for eliminating system buffeting during sliding mode control of linear motor

A technology of linear motor and control method, which is applied in the direction of control system, AC motor control, electrical components, etc., can solve the problems affecting the tracking accuracy of the control system, etc.

Inactive Publication Date: 2011-09-14
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the forced hard switching characteristic of the sliding mode control switch control causes its own fatal shortcoming - chattering, which seriously affects the tracking accuracy of the control system

Method used

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  • Control method and device for eliminating system buffeting during sliding mode control of linear motor
  • Control method and device for eliminating system buffeting during sliding mode control of linear motor
  • Control method and device for eliminating system buffeting during sliding mode control of linear motor

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Embodiment Construction

[0075] Embodiment of system chattering elimination control method in linear motor sliding mode control

[0076] In this example, the system chattering elimination control method in the linear motor sliding mode control is aimed at the mathematical expression of the permanent magnet synchronous linear motor, that is, the state equation is as follows:

[0077] x ( k + 1 ) = Ax ( k ) + B [ A ‾ x ( k ) + u ( k ) + N ‾ f ( k ) ] - - - i

[0078] In the formula:

[0079] A and B are the two matrix coefficients of the state equation, is the st...

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Abstract

The invention relates to a control method and device for eliminating system buffeting during sliding mode control of a linear motor. In the method, a sign function in the conventional sliding mode control formula is replaced by a diffusion hysteresis function, so that control voltage on a mover coil is evaluated. Due to the soft switching property of the diffusion hysteresis function, buffeting during sliding mode control is eliminated. Parameters in a formula are obtained by second-order approximation and an experiment. The device comprises a linear motor, a displacement sensor, a signal processor, a driving circuit and the like, wherein a control signal of the signal processor is connected to the driving circuit; the signal processor comprises a central processing unit, an A / D (Analog to Digital) circuit, a D / A (Digital to Analog) circuit, an ROM (Read Only Memory) module, an RAM (Random Access Memory) module, a pulse width modulation module and a signal receiving circuit, and is used for storing a formula and parameters of a sliding mode control method; and the central processing unit is used for obtaining a voltage signal of the mover coil according to the mover displacement data of the displacement sensor and regulating the voltage of the mover coil through the pulse width modulation module so as to realize stable linear movement of the mover. By adopting the method and the device, system buffeting is eliminated effectively, and the running reliability is enhanced; and the method and the device are easy to realize.

Description

(1) Technical field [0001] The invention relates to the technical field of linear motor interference control, in particular to a control method and device for eliminating chattering generated in nonlinear interference and strong external interference by linear motor sliding mode control. (2) Background technology [0002] Permanent Magnet Linear Synchronous Motor (PMLSM for short) is a thrust device that directly converts electrical energy into linear motion. The linear motion of the mover is realized through the voltage control on the mover coil. It has the characteristics of high response, high stiffness and high precision, and has attracted attention in more and more applications. The permanent magnet synchronous linear motor is the best choice for the actuator in the servo system. However, the existence of cogging effect, end effect, system parameters (mover mass, viscous friction coefficient, etc.), non-linear change of frictional resistance, and observation noise of t...

Claims

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Application Information

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IPC IPC(8): H02P25/06H02P25/064
Inventor 党选举杨青张月玲
Owner GUILIN UNIV OF ELECTRONIC TECH
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