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Linear motor traction system cogging force reduction method

A traction system, linear motor technology, applied in control systems, AC motor control, motor speed or torque control, etc., to achieve the effects of easy production, improved thrust fluctuation performance, and improved train running quality

Active Publication Date: 2017-11-24
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The biggest limitation of permanent magnet linear motors is thrust fluctuation

Method used

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  • Linear motor traction system cogging force reduction method
  • Linear motor traction system cogging force reduction method
  • Linear motor traction system cogging force reduction method

Examples

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Embodiment Construction

[0022] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing;

[0023] as attached figure 1 As shown, a method for reducing positioning force of a linear motor traction system disclosed in an embodiment of the present invention, the traction system includes four identical three-phase primary permanent magnet linear motors; the first primary permanent magnet linear motor 1 and the second primary permanent magnet linear motor The spatial distance of the linear motor 2 (the distance between the two starting ends) is d 12 , the space distance between the first primary permanent magnet linear motor 1 and the third primary permanent magnet linear motor 3 is d 13 , the spatial distance between the third primary permanent magnet linear motor 3 and the fourth primary permanent magnet linear motor 4 is d 34 . as attached figure 2 As shown, each primary permanent magnet linear motor includes three-phase modules, each phas...

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Abstract

The present invention discloses a linear motor traction system cogging force reduction method. The traction system comprises four three-phase primary permanent magnet linear motors, the cogging forces of the linear motors are subjected to Fourier decomposition to obtain the harmonic number m with maximum amplitude; a space distance between a first primary permanent magnet linear motor and a second primary permanent magnet linear motor is (k1+1 / 2(2*m)) [Tau]s, and the whole thereof is a first combination body; a space distance between a third primary permanent magnet linear motor and a fourth primary permanent magnet linear motor is (k2+1 / 2(2*m)) [Tau]s, and the whole itself is a second combination body; the cogging force of the first combination body is subjected to Fourier decomposition to obtain the harmonic number n with maximum amplitude; and a space distance between two combination bodies is (k3+1 / 2(2*m)) [Tau]s, wherein k1, k2 and k3 are positive integers, and the [Tau]s is a stator polar distance. The linear motor traction system cogging force reduction method can substantially weaken the cogging force, can improve the thrust fluctuation performance and keep the static state average thrust of a single motor invariant so as to maintain the original passenger-carrying capability of a train.

Description

technical field [0001] The invention relates to a method for reducing the positioning force of a linear motor traction system, which belongs to the technical field of motor drive and control. Background technique [0002] Urban rail transit traction system is a multi-motor drive system. Due to fast response speed, high power density, permanent magnets and armature windings are installed on the primary, simple secondary structure, and low engineering cost, primary permanent magnet linear motors are playing an increasingly important role in urban rail transit. [0003] The biggest limitation of permanent magnet linear motors is thrust fluctuation. The positioning force is the main component of the thrust fluctuation, and it is also an important symbol to evaluate the performance of the permanent magnet linear motor. The existing research methods are all based on a permanent magnet linear motor, and reduce the positioning force by improving the structure of the permanent magn...

Claims

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Application Information

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IPC IPC(8): H02P25/06H02P5/00
CPCH02P5/00H02P25/06
Inventor 王伟冯亚南程明花为
Owner SOUTHEAST UNIV
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