Five-degree-of-freedom magnetic levitation electric spindle rotor displacement self-detection system and method

Abstract

The invention discloses a five-degree-of-freedom magnetic levitation electric spindle rotor displacement self-detection system and method. The system is composed of a fuzzy support vector machine displacement prediction module, two linear closed-loop controllers and two force / current converters. The fuzzy support vector machine displacement prediction module is composed of four fuzzy support vector machine radial displacement prediction modules and a fuzzy support vector machine axial displacement prediction module. Each of the radial displacement prediction module and the axial displacement prediction module is composed of a training sample set module, a data preprocessing module, a fuzzy data module, an optimal performance parameter determination module and a fuzzy support vector machinetraining module. The fuzzification data module fuzzifies the training sample set by using a fuzzy membership function; the optimal performance parameter determination module optimizes a penalty parameter and a kernel width by using a simplified particle swarm optimization algorithm, and obtains a group of penalty parameter and kernel width with the best performance index; and the system structureis simplified, and the control performance of the magnetic bearing is improved.

Description

technical field [0001] The invention relates to a detection technology for the rotor displacement of a five-degree-of-freedom magnetic levitation electric spindle, which is widely used in high-speed cutting fields such as aerospace, vacuum technology, machinery industry, and energy transportation. Background technique [0002] With the development of high-speed cutting technology, electric spindles require higher speed and high precision. Due to the existence of friction, traditional mechanical bearings are increasingly unable to meet the requirements of high-speed operation, while electric spindles supported by magnetic suspension bearings can greatly improve the performance of electric spindles. . Magnetic suspension bearing (abbreviated as magnetic bearing) is a new type of high-performance bearing that uses the current in the coil or the permanent magnet to generate electromagnetic force to suspend the rotor in space without any mechanical contact between the rotor and t...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a five-degree-of-freedom magnetic levitation electric spindle rotor displacement self-detection system and method based on the simplified particle swarm optimization algorithm to optimize the fuzzy support vector machine, aiming at the inherent nonlinearity and parameter instability of the magnetic bearing, it is difficult to establish the rotor displacement Accurately calculate the problem of the model, overcome the shortcomings of several existing magnetic bearing self-testing methods, reduce the cost of the magnetic bearing system, reduce the axial size of the magnetic bearing, and improve the dynamic performance of the system

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