×

Electric motor arrangement

  • US 3,878,414 A
  • Filed: 11/21/1973
  • Issued: 04/15/1975
  • Est. Priority Date: 11/22/1972
  • Status: Expired due to Term
First Claim
Patent Images

1. An electric motor arrangement comprising:

  • a rotor being formed as a single rotatable disc made of soft magnetic material, said disc having a plurality of radially projecting rotor poles disposed equi-distantly on its periphery, each of said rotor poles having a turned-up axial projection;

    a concentric disc-shaped permanent magnet being mounted fixedly to the lower surface of said disc;

    a rotor shaft, said disc and said permanent magnet being mounteD fixedly on said rotor shaft;

    a stator plate consisting of a pair of parallel arms which form stator elements and are disposed in a 180* - offset manner, said arms having a plurality of diametrically opposite stator poles disposed concentrically to the disc, said stator poles being disposed across a pre-determined air gap from said rotor poles and arranged at equal pitches with said rotor poles; and

    an energizing coil being wound on one of said arms of said stator plate, said permanent magnet magnetizing said rotor poles to a pre-determined magnetic polarity and said stator poles to the opposite magnetic polarity thereby preventing the fluxes flowing through said rotor poles and said stator poles from causing axial forces in said rotor shaft and thus providing a large torque to said rotor shaft at a small input power.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×