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High speed induction motor with squirrel cage rotor

  • US 4,644,210 A
  • Filed: 12/12/1985
  • Issued: 02/17/1987
  • Est. Priority Date: 12/12/1985
  • Status: Expired due to Fees
First Claim
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1. In an induction motor comprising a stator including a laminated iron core, and a multiphase winding on said core;

  • and a rotor including a one piece rotor core and shaft coaxially mounted within the stator;

    the improvement wherein said rotor comprisesa plurality of elongated slots in the periphery of the rotor core, said slots having a reduced outer radial end portion adjacent to the core periphery and partially enclosing said slots,a plurality of elongated conductor bars received in said slots and having reduced outer radial end portions received in the reduced outer radial end portions of said slots, and providing outer radial restraint of said conductor bars in the rotor core, said conductor bars having end portions extending outwardly beyond the ends of said rotor core,conductor end rings at opposite axial ends of the rotor core, said end rings having a plurality of slots in the periphery thereof, said end portions of said conductor bars received in said last mentioned slots, andnon-magnetic metal spacers mounted between the ends of the rotor core and the conductor end rings for reducing the self-induced magnetic field around the end rings thereby reducing the electrical reactance of the end rings.

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