Patent ID: 6011333
Filing Date: 2000-01-04
Classification: H02K

Abstract:
A vibrator motor, comprising:(a) a housing;(b) a shaft supported by said housing, said shaft having a longitudinal center axis;(c) a toroidal permanent field magnet fixedly disposed inside said housing coaxially with said center axis, said field magnet having alternate north and south magnetic poles arranged at an even angular pitch about said center axis;(d) an eccentric armature rotor disposed in said housing and mounted on said shaft, said rotor having an eccentric nonmagnetic body, a plurality of armature coils arranged at an even pitch angle about said center axis, and a commutator disposed coaxially with said center axis, said body comprising a first part and a second part that is partially embedded in said first part, said first part integrally having a first coil retaining part and said second part integrally having a second coil retaining part, said second coil retaining part being disposed radially inside said first coil retaining part and radially outside said field magnet in a manner that said second coil retaining part opposes said field magnet leaving an airgap therebetween, said second coil retaining part integrally having core parts corresponding individually to said armature coils, said core parts being disposed at an even pitch angle within a 180.degree. angular range about said center axis, said armature coils being arranged in a manner that said coils are individually wound around said core parts and sandwiched between said first coil retaining part and said second coil retaining part; and(e) a pair of resilient commutator brushes of opposite polarities disposed in said housing in contact with said commutator.