Patents Examined by Patrick H. Salce
  • Patent number: 4755698
    Abstract: Operating noise of a dynamo electric machine, and particularly a three-phase vehicular-type alternator, can be reduced by changing the reluctance or permeability of the magnetic path between rotor and stator of adjacent stator teeth by splitting the stator teeth to introduce additional radially extending gaps in the stator teeth or by distributing, non-uniformly or uniformly, ferromagnetic slot closers about the circumference of the stator slots while leaving, adjacent a stator slot with a magnetic closer, open stator slots or slots covered only with non-magnetic slot cover elements, such as treated paper, cardboard, or the like.
    Type: Grant
    Filed: February 25, 1987
    Date of Patent: July 5, 1988
    Assignee: Robert Bosch GmbH
    Inventors: Manfred Frister, Istvan Ragaly