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Interpole-coil-based air-gap-free sensor electromagnetic attraction suspension control method

A technology of additional coils and suspension control, applied in electric traction, electric vehicles, transportation and packaging, etc., can solve the problems of safety and reliability, and achieve the effect of low cost, high reliability and reduced requirements

Inactive Publication Date: 2012-02-22
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The disadvantage of this method is that the safety, reliability and stability of the system largely depend on the detection value of the air gap sensor

Method used

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  • Interpole-coil-based air-gap-free sensor electromagnetic attraction suspension control method
  • Interpole-coil-based air-gap-free sensor electromagnetic attraction suspension control method
  • Interpole-coil-based air-gap-free sensor electromagnetic attraction suspension control method

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Embodiment Construction

[0013] Apparently, the method of the present invention has many specific implementation modes under the peripheral conditions of the prior art.

[0014] image 3 One of the specific implementation methods is expressed: an additional coil with a certain number of turns is wound on the suspension electromagnet, and the additional coil is wound together with the suspension electromagnet coil, and an AC voltage of a certain frequency is added to the additional coil during operation, and the coil The AC current is monitored online; according to the voltage and current values, the resistance and inductance parameters of the current electromagnet system are calculated in real time through an online identification algorithm. According to the inductance, look up the inductance-air gap comparison table made in advance through experiments to obtain the current air gap value; use the air gap value for closed-loop control to ensure that the suspended matter can be suspended stably near the...

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Abstract

The invention discloses an interpole-coil-based air-gap-free sensor electromagnetic attraction suspension control method. In the method, an interpole coil is added on a suspension coil; voltage with a certain feature is applied to the interpole coil; inductance of the interpole coil is identified according to input voltage and output current of the interpole coil; a suspension air gap value is acquired according to the inductance of the interpole coil; and closed loop control is realized by using the air gap value. The method is applicable to electromagnetic attraction suspension control; as an air gap sensor is avoided, a system is simplified greatly, a precision requirement on a system track of a maglev train is reduced, instability of control over the system caused by inaccurate measurement of the sensor can be avoided, and problems that the maglev train passes through a track gap and the like can be solved; furthermore, the method has the advantages of high dependability, low cost, safety, reliability and the like.

Description

technical field [0001] The invention relates to a method for controlling electromagnetic attraction levitation without an air gap sensor, in particular to a levitation control and system identification for a maglev vehicle. Background technique [0002] The electromagnetic suction levitation system is an unstable system, and usually requires air gap feedback control to achieve system stability. For electromagnetic suction suspension, because the electromagnetic force and the air gap value are in an approximate inverse square relationship, when the electromagnet current remains unchanged, the electromagnetic force increases for a small air gap, which will further reduce the air gap, and the electromagnetic force for a large air gap decreases. would further increase the air gap, so the system would not be stable. If it is necessary to realize the stable suspension of the object, it is necessary to adjust the electromagnet current. For example, when the air gap becomes smaller...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L13/04
Inventor 董金文张昆仑王滢刘国清靖永志王莉蒋启龙郭育华郭小舟
Owner SOUTHWEST JIAOTONG UNIV
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