There is a growing tendency to boost the capacity of traction motors for rolling stock. At the same time the motors are subject to rigid restrictions in weight and dimensions. To raise motor capacity it is therefore necessary to improve the insulation system. The IEC provides that the insulation system of the Class H traction motor must continuously endure temperatures up to 180 degree C. For the purpose of improving reliability, a Class C insulation system capable of withstanding 220 degree C continuously has been developed. The Class C insulation system mainly consists of mica and a Class C solventless type varnish, isocyanurate oxazolidone (IO) resin. The liquid IO resin can be vacuum-impregnated at room temperate and has an extremely long pot life. Furthermore the cured IO resin maintains room-temperature characteristics at temperatures up to 220 degree C. By combining the resin with principally inorganic materials the 220 degree C performance is achieved.

  • Availability:
  • Corporate Authors:

    Hitachi Limited, Publications Department

    Nippon Bldg, #6-2, 2-chome Ohtemachi, Chiyoda-ku
    Tokyo 100,   Japan 
  • Authors:
    • Hakamada, T
    • Miya, H
    • Narahara, T
  • Publication Date: 1978-12

Media Info

  • Pagination: p. 385-390
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00196461
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Aug 15 1979 12:00AM