Technical Reports

Comparisons Between Designs for Single-sided Linear Electric Motors: Homopolar Synchronous and Induction

  • 01
  • Sep
  • 1980
AUTHOR: Thomas A. Nondahl, Eike Richter
SUBJECT: Evaluation
KEYWORDS: High Speed Ground Transportation, Linear Induction Motors, Linear Synchronous Motors, Linear Electric Motors
ABSTRACT: A design study of two types of single-sided (with a passive rail) linear electric machine designs, namely homopolar linear synchronous machines (LSM's) and linear induction machines (LIM's), is described. It is assumed the machines provide tractive effort for several types of light rail vehicles and locomotives. These vehicles are wheel supported and require tractive powers ranging from 200 kW to 3735 kW and top speeds ranging from 112 km/hr to 400 km/hr. All designs are made according to specified magnetic and thermal criteria. The LSM advantages are a higher power factor, much greater restoring forces for track misalignments, and less track heating. The LIM advantages are no need to synchronize the excitation frequency precisely to vehicle speed, simpler machine construction, and a more easily anchored track structure. The relative weights of the two machine types vary with excitation frequency and speed; low frequencies and low speeds favor the LSM. The effect of variations in several LSM design parameters are shown to illustrate trends in machine dimensions, track weight, and commutating reactance. The details of the LSM design programs are described and a FORTRAN IV listing of the programs is provided.
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