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Semi-centralized open-winding primary permanent magnet linear motor traction system for urban rail transit

A permanent magnet linear motor, urban rail transit technology, applied in the traction of AC induction motors, motor vehicles, electric vehicles, etc., can solve the problem of using a large number of traction converters, reduce maintenance costs and initial investment costs, The effect of broadening the operating speed range and reducing the weight of the equipment

Active Publication Date: 2020-04-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: Aiming at the problem of using too many traction converters in the existing open-winding motor system, the present invention proposes a semi- Centralized open-winding primary permanent magnet linear motor traction system

Method used

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  • Semi-centralized open-winding primary permanent magnet linear motor traction system for urban rail transit
  • Semi-centralized open-winding primary permanent magnet linear motor traction system for urban rail transit

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Embodiment 1

[0017] refer to figure 1 and figure 2 , this embodiment provides a semi-centralized open-winding primary permanent magnet linear motor traction system for urban rail transit, the system includes n+1 traction converters and n three-phase permanent magnet linear motors, and The n+1 traction converters include n independent traction converters and one multiplexing traction converter, wherein the number of independent traction converters is the same as the number of three-phase permanent magnet linear motors. In this embodiment, the traction converter is selected as a three-leg traction converter. At the same time, the mover design parameters of each three-phase permanent magnet linear motor are exactly the same, and they are in the same phase in space.

[0018] Specifically, on the basis of retaining the structural characteristics of the open-winding motor system, the system adopts the phase voltage type bridge arm multiplexing technology to implement semi-centralized control ...

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Abstract

The invention discloses a semi-centralized open-winding primary permanent magnet linear motor traction system for urban rail transit. The system comprises n + 1 traction converters and n three-phase permanent magnet linear motors, wherein the n + 1 traction converters comprise n independent traction converters and a multiplexing traction converter; the number of the independent traction convertersis the same as that of the three-phase permanent magnet linear motors; one side of each three-phase permanent magnet linear motor is connected with one independent traction converter; and the other side of each three-phase permanent magnet linear motor is connected with the multiplexing traction converter. Therefore, according to the semi-centralized open-winding primary permanent magnet linear motor traction system, the operating speed range of the primary permanent magnet linear motor is widened through the open-winding structure, and the number of traction converters is effectively reducedthrough the phase voltage bridge arm multiplexing technology.

Description

technical field [0001] The invention relates to the technical field of motor drive and control, in particular to a semi-centralized open-winding primary permanent magnet linear motor traction system for urban rail transit. Background technique [0002] The urban rail transit system requires the traction system to have wide speed regulation capability. However, due to the existence of permanent magnets, the air-gap magnetic field of permanent magnet linear traction motors is usually difficult to adjust. In order to expand the operating speed range of permanent magnet linear traction motors, field weakening control is usually required. Generally, for the safety of train operation, the air gap of the linear motor should not be set too small, usually 4-6 times of the air gap of the rotary motor. However, the large air gap feature will significantly reduce the inductance of the permanent magnet linear traction motor, which will significantly increase the required field weakening...

Claims

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Application Information

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IPC IPC(8): B60L9/28B60L15/00
CPCB60L9/28B60L15/007B60L2200/26
Inventor 王伟曾昕卢
Owner SOUTHEAST UNIV
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