Suppression of thrust fluctuation of doubly-fed linear motor

Because the mover and stator of a doubly-fed linear motor are both equipped with three-phase windings, the motor enables contactless energy to be transferred from the stator to the mover. Thus, when a doubly-fed linear motor is used in the linear driving system of trains, neither an overhead line nor a third rail is needed. However, the doubly-fed motor will lead to more severe thrust fluctuation than the unilateral motors. In order to overcome this shortcoming, the thrust fluctuation of the doubly-fed motor should be analyzed. In this paper, an expression for motor thrust is derived. It points out that the slot effect caused by the slotted structure is the main reason for the increase of thrust fluctuation. The method of adopting unequal pole pitch and unequal slot numbers per pole per phase of stator and mover, is proposed to weaken the slot effect when designing the motor slot parameters. Three different motor models are simulated by ANSOFT. The proposed method results in a motor thrust fluctuation coefficient of 8.4%, compared to 49.4% for the conventional method. Therefore, the motor's thrust fluctuation is effectively suppressed by the proposed method.

• Record URL:
  http://jmt.swjtu.edu.cn/EN/abstract/abstract8598.shtml
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/2095087X
• Supplemental Notes:
  • Copyright © 2012 Journal of Modern Transportation
• Authors:
  • Wang, Ying
  • Zhang, Kunlun
  • Zhou, Mi
• Publication Date: 2012

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References;
• Pagination: pp 103-107
• Serial:
  • Journal of Modern Transportation
  • Volume: 20
  • Issue Number: 2
  • Publisher: Springer Verlag
  • ISSN: 2095-087X
  • Serial URL: http://jmt.swjtu.edu.cn/EN/volumn/home.shtml
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Electric trains; Finite element method; Linear motors; Stators; Thrust
• Uncontrolled Terms: Air gap
• Subject Areas: Railroads; Vehicles and Equipment; I90: Vehicles;

Filing Info

• Accession Number: 01486843
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 18 2013 12:13PM