On-line identification method and system for inductance parameters of levitation electromagnet of normally-conductive maglev train

A technology of levitating electromagnets and inductance parameters, which is applied in the direction of motor vehicles, electric vehicles, railway vehicles, etc., can solve problems such as errors and achieve easy-to-achieve effects

Active Publication Date: 2019-12-27
ZHUZHOU ELECTRIC LOCOMOTIVE CO
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0014] However, although the finite element analysis has considered factors such as magnetic flux leakage and magnetic saturation to a certain extent, there is still a gap

Method used

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  • On-line identification method and system for inductance parameters of levitation electromagnet of normally-conductive maglev train
  • On-line identification method and system for inductance parameters of levitation electromagnet of normally-conductive maglev train
  • On-line identification method and system for inductance parameters of levitation electromagnet of normally-conductive maglev train

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Embodiment Construction

[0028] The analysis process and basic steps of the present invention are introduced below.

[0029] Since magnetic flux leakage and magnetic saturation are neglected, the derivation process of the second step in formula (1) ~ formula (3) will cause calculation errors. In order to ensure accuracy, the derivation of the first step in formula (2) ~ formula (3) is retained have to:

[0030]

[0031] The relationship between levitation force and air gap flux density is:

[0032]

[0033] Put formula (5) into formula (4) to get:

[0034]

[0035] It is inconvenient to directly measure the inductance parameter of the suspension electromagnet, but the electromagnetic attraction force between the suspension electromagnet and the guide rail (that is, the suspension force) can be obtained through a special test device. During the working process of the suspension system, the relationship data table of the suspension gap, current and suspension force is stored in the controller. A

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Abstract

The invention discloses an on-line identification method and system for the inductance parameters of a levitation electromagnet of a normally-conductive maglev train. The inductance parameters of thelevitation electromagnet are calculated through the following formula, wherein N is the number of turns of a levitation electromagnet coil, i is the current of the suspension electromagnet, s is the magnetic pole area of the suspension electromagnet, f is the suspension force, and mu0 is vacuum permeability. According to the inductance parameter identification method, the influences of the magnetic flux leakage, the iron core magnetic resistance and the magnetic saturation are fully considered, and the accurate inductance parameters can be obtained. Moreover the table look-up is achieved through the internal software of a controller during the working process of a suspension system, the online obtaining can be achieved through the interpolation calculation, and the method and the system are easy to achieve.

Description

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Claims

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Application Information

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Owner ZHUZHOU ELECTRIC LOCOMOTIVE CO
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