Axial magnetic bearing control system

An axial magnetic bearing and control system technology, applied in the control field, can solve the problems of difficult to meet the precise control of the system, poor robustness, etc., to ensure system stability, reduce power consumption and production costs, and achieve good robustness. Effect

Active Publication Date: 2013-04-10
JIANGSU UNIV
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Problems solved by technology

At present, PID controllers are often used in engineering to control magnetic bearings, but this method relies too much on the model parameters of the control object, and its robustness is poor. Using PID controller, it is difficult to meet the requirements of precise control of the system

Method used

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  • Axial magnetic bearing control system

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Embodiment Construction

[0014] Such as figure 1 , the control system of axial magnetic bearing of the present invention is by fuzzy controller a , power amplifier module b , prototype body c (axial magnetic bearing) and displacement detection module d A closed-loop control system formed by sequential connection. Among them, the fuzzy controller a based on fuzzy positive definite rules a 1 PID fractional order controller under online adjustment a 2 and force / current conversion module a 3 connections, displacement detection module d eddy current displacement sensor d 1 and displacement interface circuit d 2 connection composition. The axial position of the axial magnetic bearing adopts the eddy current displacement sensor d 1 for detection, the detected displacement signal passes through the displacement interface circuit d 2 processing, output the modulated displacement output signal z , compared with the given reference position signal z* to get the deviation e and its rate of change ...

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Abstract

The invention discloses an axial magnetic bearing control system which is a closed-loop system formed by a fuzzy controller, a power amplification module, a model machine body and a displacement detection module in a sequentially-connecting mode. The fuzzy controller is formed by connecting of a force / current transformation module and a proportion integration differentiation (PID) fractional order controller based on fuzzy positive definite rule on-line adjustment. An axial displacement signal detected by the displacement detection module is compared with a given reference position signal, a deviation and a change rate of the deviation are acquired, the deviation and the change rate of the deviation are both regarded as input variables of the fuzzy controller, the input variables are subjected to processing of the PID fractional order controller based on fuzzy positive definite rule on-line adjustment, a proportion coefficient, an integration coefficient, a differentiation coefficient, a differentiation order coefficient and integration order coefficient are regarded as control variables to output a force signal, an control current is output through the power amplification module to drive an axial control coil of an axial magnetic bearing model machine body to achieve closed-loop control, the axial magnetic bearing control system can well guarantee stability, adapt to change of a controlled object and is good in robustness.

Description

technical field [0001] The invention belongs to the technical field of control, and in particular relates to a control system of a non-mechanical contact magnetic suspension bearing (magnetic bearing). Background technique [0002] Magnetic bearing is a new type of support bearing that uses magnetic field force to suspend the rotor in space so that it has no mechanical contact with the stator. It has the advantages of no friction, no wear, no lubrication and sealing, high speed, high precision and long life. The magnetic bearing system is mainly composed of two parts: the magnetic bearing mechanical structure and the control system. The mechanical structure affects the working performance of the entire magnetic bearing system, and its corresponding control system determines the dynamic performance, stiffness, damping and stability of the magnetic bearing system. Therefore, The mechanical structure and control system restrict whether a complete magnetic bearing system can ach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 张维煜朱熀秋
Owner JIANGSU UNIV
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