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Multi-pole rotor particularly for small and miniature electric generators and motors

  • US 4,513,216 A
  • Filed: 11/09/1977
  • Issued: 04/23/1985
  • Est. Priority Date: 06/15/1977
  • Status: Expired due to Term
First Claim
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1. Multi-pole rotor for small and minature electric motors and generators for use in tachometers, stepping motors, synchronized clocks, and the like wherein a series of oppositely directed contiguous radially oriented magnetic poles are arranged segmentally about the periphery of the rotor extending parallel with each other and generally in the direction of the axial length of the rotor, said poles defining a continuous outer circumferential surface having alternating N-S-N-S . . . magnetic poles and a corresponding continuous inner circumferential surface having respective alternating S-N-S-N . . . magnetic poles, the respective end surfaces of all of said poles lying in only two axially spaced common planes and carrier means to mount said poles on a rotor shaft, said poles and carrier means being integrally fabricated from particulate highly coercive magnetic material with a binder, said carrier means comprising a pair of complementary disks with the integrally fabricated poles projecting generally axially from one side at the periphery of each disk, the poles of each disk being circumferentially spaced, whereby the poles of one disk will closely interfit with the poles of the other disk when the pair of disks are in axially facing abutting engagement.

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