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Method for controlling electromagnetic attractive force suspension without adopting gas gap sensor on basis of additional alternating voltage

A technology of suspension control and electromagnetic attraction, applied in the direction of magnetic attraction or thrust holding device, electrical components, etc., can solve the problems of safety and reliability, etc., and achieve the effect of low cost, solving rail gaps, and high reliability

Inactive Publication Date: 2011-11-23
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for controlling electromagnetic attractive force suspension without adopting gas gap sensor on basis of additional alternating voltage
  • Method for controlling electromagnetic attractive force suspension without adopting gas gap sensor on basis of additional alternating voltage
  • Method for controlling electromagnetic attractive force suspension without adopting gas gap sensor on basis of additional alternating voltage

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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: the closed-loop control output control voltage is doped with a harmonic voltage of a certain fixed frequency, the output current of the electromagnet system is detected, and the fundamental wave component of the frequency in the output current is analyzed. The voltage component and current component of the current electromagnet system can be identified online in real time to obtain the resistance and inductance parameters of the current electromagnet system; according to the inductance, search the inductance-air gap comparison table made in advance through experiments to obtain the current air gap value, and use the air gap value to perform Closed-loop control ensures that suspended solids can be stably suspended around a pre-selected air gap length.

[0015] T...

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Abstract

The invention discloses a method for controlling the electromagnetic attractive force suspension without adopting a gas gap sensor on the basis of an additional alternating voltage. The alternating voltage with certain features is doped in a closed-loop control voltage of a suspension electromagnet coil; the obtained voltage is applied to the suspension electromagnet coil; a current of a component with the same features is obtained in the coil; according to the input and doped feature alternating voltage and the current component with the same features in the current of the coil, the inductance of the suspension electromagnet coil is identified; a suspension electromagnet gas gap is obtained by the inductance; and the gas gap value is used for carrying out closed-loop control. Due to no adoption of the gas gap sensor, a system can be greatly simplified and the real suspension gas gap can be reflected by the inductance obtained by the additional coil. Due to the adoption of the method,the requirement on the rail accuracy of a maglev vehicle system can be lowered, the control instability of the system cannot be caused by inaccurate measurement of the gas gap sensor, and the problems of rail gap passing, cogging and the like of a maglev vehicle can be well solved. The method for controlling the electromagnetic attractive force suspension without adopting the gas gap sensor on the basis of the additional alternating voltage has the advantages of high reliability, low cost, safety 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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IPC IPC(8): H02N15/00
Inventor 董金文张昆仑靖永志王滢刘国清王莉蒋启龙郭育华郭小舟
Owner SOUTHWEST JIAOTONG UNIV
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