LS-SVM-based sensorless control system of bearingless induction motor

A technology of radial displacement and asynchronous motors, applied in control systems, AC motor control, electrical components, etc., can solve problems such as strong dependence on mathematical models, high-frequency signal injection, and poor robustness

Inactive Publication Date: 2019-01-11
HENAN UNIV OF SCI & TECH
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Problems solved by technology

Among the currently researched displacement self-sensing detection methods, the observer method is highly dependent on the mathematical model of the bearingless motor and has poor robustness; the high-frequency injection method requires high-frequency signal injection and compl

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  • LS-SVM-based sensorless control system of bearingless induction motor
  • LS-SVM-based sensorless control system of bearingless induction motor
  • LS-SVM-based sensorless control system of bearingless induction motor

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Embodiment Construction

[0030] The implementation method of the control system of bearingless asynchronous motor without radial displacement sensor based on LS-SVM is as follows: firstly, according to the working principle of bearingless asynchronous motor, a novel nonlinear estimation model of rotor radial displacement variable is deduced; then, according to the estimation model The non-linear relationship between the relevant variables, the torque winding stator current, stator flux linkage, suspension winding stator current and rotor radial displacement when the bearingless asynchronous motor control system is running with the rotor radial displacement sensor are used as fitting factors , obtain a high-precision rotor radial displacement estimator based on the least squares vector machine (LS-SVM) through offline training; on the basis of the dynamic decoupling control of the inverse system of a bearingless asynchronous motor, the LS-SVM radial displacement estimator is used instead The mechanical ...

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Abstract

The invention provides an LS-SVM-based sensorless control system of a bearingless induction motor. According to the non-linear estimation model of radial displacement variable, formulas (4) and (5) are given. The generalization ability of SVM is used to approximate the nonlinear relationship between radial displacement and related physical variables, so that the real-time estimation of the radialdisplacement of the rotor can be realized, the estimation accuracy of the radial displacement does not depend on the accurate mathematical model of the motor, the radial displacement estimation errorcaused by the inaccurate motor parameters can be effectively overcome, and the complicated signal extraction algorithm is not needed, and the LS-SVM rotor radial displacement estimator is constructed,thereby getting rid of that mechanical radial displacement sensor, getting rid of the mechanical radial displacement sensor, overcoming the influence of modeling error of nonlinear radial displacement estimation model, and avoiding the radial displacement estimation error caused by inaccurate motor parameters. A new control system is constructed based on LS-SVM rotor radial displacement estimator, which can effectively reduce the cost of bearingless induction motor control system.

Description

technical field [0001] The invention relates to the technical field of parameter detection of novel special AC motors, in particular to a bearingless asynchronous motor without radial displacement sensor control system based on LS-SVM. Background technique [0002] Bearingless motor is based on the similarity between magnetic bearing and AC motor stator structure. It is a new type of motor suitable for high-speed operation developed in recent years. It has broad application prospects in aerospace, material sealing transmission, advanced manufacturing and other fields. In order to realize the stable magnetic levitation control of the rotor, it is necessary to detect and control the radial displacement of the rotor in real time; the eddy current displacement sensor is extremely expensive, and the self-sensor detection of the radial displacement of the rotor is to reduce the cost of its control system and promote its practical application The essential. [0003] A search of ex...

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Application Information

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IPC IPC(8): H02P23/14H02P25/02
CPCH02P23/14H02P25/02
Inventor 卜文绍李劲伟袁澜陈有鹏李自愿乔岩茹
Owner HENAN UNIV OF SCI & TECH
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