TRACTIVE PROPERTIES OF DC LINEAR MOTORS UNDER CONSTANT CURRENT DRIVE

In operating the dc linear motor by a constant current source, the voltage to be applied at current switching must not exceed the maximum allowable voltage and therefore, the current waveform must have certain rise and fall times. In this paper, it is assumed that a trapezoidal current flows in the coil. The dc linear motor with the maximum allowable voltage 20 V and the maximum allowable emf 40 kAT which do not cause a saturation of the onboard magnetic poles (the pole gap a/m, and the field flux density 0.5 Wb/sq m) can produce the 500 km/h propulsion force. However, no levitation force is generated because this force is limited when the coil current exceeds the maximum allowable current. The power factor and efficiency increase as the feeding length decreases. The power factor is about 40% when the feeding length is 2 km. This value is not practical. This paper has dealt with an ideal case. In practice, the efficiency and power factor must be lowered further.

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  • Corporate Authors:

    Scripta Publishing Corporation

    Investment Building
    Washington, DC  USA  20005
  • Authors:
    • Aiba, S
    • Amemiya, Y
  • Publication Date: 1976-3

Media Info

  • Features: References;
  • Pagination: p. 23-29
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00168002
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jan 13 1978 12:00AM