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Displacement sensor fault-tolerant control system and method of active electromagnetic bearing

A technology of active electromagnetic bearings and displacement sensors, which is applied in the direction of electrical program control, bearings, shafts and bearings, and can solve the problems of increased size design and increased system cost

Active Publication Date: 2019-07-19
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem brought by the former is a substantial increase in system cost, and the installation of redundant sensors also adds new requirements to the size design of the electromagnetic bearing; the latter usually requires a special design of the electromagnetic bearing body

Method used

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  • Displacement sensor fault-tolerant control system and method of active electromagnetic bearing
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  • Displacement sensor fault-tolerant control system and method of active electromagnetic bearing

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Embodiment 1

[0071] The inventive idea of ​​the present invention is: for the problems such as the increase in cost and the limited space size caused by the fault-tolerant control method of the displacement sensor 3 such as redundant sensors, the frequency spectrum mutation of the output signal of the sensor is detected by a specially designed wavelet filter, and the position of the displacement sensor 3 is judged. At the same time, the self-sensing technology of the active electromagnetic bearing 2 is used to provide the rotor displacement estimation signal after the sensor failure, so that the system can continue to operate stably according to the rotor displacement estimation signal after the sensor failure.

[0072] The displacement sensor fault-tolerant control system of the active electromagnetic bearing of the present invention includes a switching power amplifier 1, an active electromagnetic bearing 2, a displacement sensor 3, a displacement estimator 4, a fault detector 5, a switch ...

Embodiment 2

[0077] In the present invention, the active electromagnetic bearing 2 is taken as an example of a four-degree-of-freedom radial electromagnetic bearing. The present invention will be further described with specific examples below in conjunction with the accompanying drawings.

[0078] exist figure 1 In the example shown, the displacement sensor fault-tolerant control system of the active electromagnetic bearing of the present invention includes a switching power amplifier 1 , an active electromagnetic bearing 2 , a displacement sensor 3 , a displacement estimator 4 , a fault detector 5 , a switch 6 and a controller 7 .

[0079] To generate bi-directional force, the electromagnets are configured differentially. The force produced by a differentially configured electromagnet is typically linearized around a reference rotor air gap using a Taylor series:

[0080]

[0081] In the formula: μ 0 is the magnetic permeability of free space, N is the number of turns of the pole-pa...

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Abstract

The invention relates to a displacement sensor fault-tolerant control system and method of an active electromagnetic bearing, and belong to the technical field of magnetic bearing sensor control. Thedisplacement sensor fault-tolerant control system comprises a displacement estimator, a fault detector and a switcher; the displacement estimator estimates rotor displacement in real time; the fault detector detects a sudden fault of a displacement sensor; and the switcher selects one-way signal in a rotor displacement signal from the displacement sensor and a rotor displacement estimation signalfrom the displacement estimator to be sent to a controller. The sudden fault of the displacement sensor is quickly detected through specially-designed wavelet filter, the rotor displacement signal isprovided after the sensor fault through a self-sensing technology of the active electromagnetic bearing, thus under the premise of not increasing the number of the displacement sensor and changing anelectromagnetic bearing body structure, the situation that the electromagnetic bearing loses efficacy due to the fault of the displacement sensor is avoided, and stable operation of the electromagnetic bearing is guaranteed. According to the method, the using efficiency of system hardware is greatly improved, and the cost is lowered.

Description

technical field [0001] The invention relates to a displacement sensor fault-tolerant control system and method of an active electromagnetic bearing, belonging to the technical field of magnetic bearing sensor control. Background technique [0002] Active electromagnetic bearings have the advantages of no friction, no lubrication, no pollution, and high speed. In recent years, they have developed rapidly in the fields of aerospace, flywheel energy storage, turbomachinery, and high-speed machine tools. In a general active electromagnetic bearing system, in order to realize the closed-loop feedback control of the system, at least one displacement sensor must be installed on each degree of freedom of the electromagnetic bearing to detect the rotor displacement signal in real time. In order to avoid the failure of the electromagnetic bearing caused by the failure of the displacement sensor and improve the stability of the system, the existing methods mainly include configuring re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C32/04G05B19/04G01B21/02
CPCF16C32/0446F16C32/0448F16C32/0487G01B21/02G05B19/04
Inventor 于洁李建坤吴新振
Owner QINGDAO UNIV
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