AC-DC radial-axial mixed magnetic bearing having three degrees of freedom and method for controlling the same

An axial hybrid, AC and DC technology, applied in the direction of shafts and bearings, bearings, magnetic attraction or thrust holding devices, etc., can solve the problems of no patents and literature, etc., and achieve the effects of simplified control, cost reduction, and length reduction

Inactive Publication Date: 2008-11-12
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There are no relevant patents and documents at home and abroad

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  • AC-DC radial-axial mixed magnetic bearing having three degrees of freedom and method for controlling the same
  • AC-DC radial-axial mixed magnetic bearing having three degrees of freedom and method for controlling the same
  • AC-DC radial-axial mixed magnetic bearing having three degrees of freedom and method for controlling the same

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Embodiment Construction

[0025] The concrete implementation of the present invention divides following 5 steps:

[0026] 1. Mechanical structure. The three-degree-of-freedom AC-DC radial-axial hybrid magnetic bearing magnetic route provides axial and radial bias fluxes at the same time with a permanent magnet. The permanent magnet material is made of high-performance rare earth material NdFeB, which is divided into 6 pieces, which is convenient for permanent magnets. processing, and then spliced ​​into a full circular ring-shaped permanent magnet; the axial control magnetic flux is generated by the axial control coil passing through the axial control direct current, and the number of ampere turns of the coil should be determined according to the actual load capacity required; The control magnetic flux is generated by passing three-phase alternating current through the radial three-phase coil. According to the requirements of the magnetic circuit, construct the overall mechanical structure and parts s...

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Abstract

This invention relates to a three freedom degree AC-DC radial-axial mixing magnetic bearing, which is fit for the electrical main shaft and rotary main shaft needs suspending support. The permanent magnet will provide radial-axial static bias magnetic flux to generate static bearing ability; the radial controlling coil and the axial controlling coil will provide magnetic flux to generate dynamic suspending force, making the rotor suspending on the balance place in radial-axial three freedom degree. The power enlarging circuit comprises axial liner power amplifier and radial CRPWM current tracking inverter, and the displacement sensor will test the shift of the rotor and then feedback to DSP controller; the DSP will operate PID compute and process, provide controlling signal to power enlarging circuit; the controlling signal will generate controlling current in magnetic bearing coil, and the controlling current will generate magnetic force in operation magnet, by which it can realize the stable suspending and real-time monitoring of the rotor in radial and axial.

Description

technical field [0001] The invention belongs to the technical field of electric transmission (mechanical transmission) equipment, and particularly refers to a new three-degree-of-freedom AC-DC radial-axial hybrid magnetic bearing and its control method, which are suitable for three-degree-of-freedom suspension supports of various rotating machines . Background technique [0002] Since the rapid development of magnetic bearing technology in the 1970s, the research direction has mainly focused on active magnetic bearings that use DC signals to provide static bias flux and control flux at the same time, and focus on axial single-degree-of-freedom and radial Research on two-degree-of-freedom magnetic bearings. Any stable rotating system needs to impose constraints on its five degrees of freedom. Therefore, two two-degree-of-freedom radial magnetic bearings and one axial single-degree-of-freedom magnetic bearing are usually used to form a five-degree-of-freedom suspension suppo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C32/04H02N15/00
CPCF16C32/0465F16C32/0485
Inventor 朱熀秋谢志意
Owner JIANGSU UNIV
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