Patent ID: 6580194
Filing Date: 2003-06-17
Classification: H02K

Abstract:
A motor comprising:an electrically conductive yoke housing configured in an oblate cylindrical cup form having two opposed flat side walls and two opposed arcuate side walls, each of which joins corresponding opposed lateral edges of said flat side walls together, wherein said yoke housing has an open end at one end and receives a plurality of brushes and a commutator, and each one of said plurality of brushes is arranged in such a manner that a longitudinal axis of said each one of said plurality of brushes extends perpendicular to said central axis of said yoke housing and generally coincides with a straight line extending through a center of each one of said arcuate side walls; and a noise limiter circuit arranged at said open end of said yoke housing and smoothing electric power to be supplied to said plurality of brushes to restrain generation of electromagnetic noise between said plurality of brushes and said commutator, said noise limiter circuit including at least one of the following: a plurality of helically wound cylindrical choke coils, each said choke coil being arranged adjacent to a corresponding corner of said yoke housing located between a corresponding one of said flat side walls and a corresponding one of said arcuate side walls in such a manner that said each choke coil extends substantially parallel to a central axis of said yoke housing; and a plurality of capacitors, which are arranged adjacent to a center of one of said flat side walls and are arranged side by side along an internal surface of said one of said flat side walls.