Patent ID: 6566782
Filing Date: 2003-05-20
Classification: H02K,Y10T

Abstract:
An electric motor having an armature with a coil winding pattern for reducing brush arcing and electromagnetic interference, comprising:a lamination stack having a plurality of radially extending posts, said posts forming a plurality of slots therebetween, said slots being arranged in a circumferential pattern; a plurality of coils wound around said slots, said coils being arranged in pairs about said lamination stack; each said coil being divided into first and second subcoil portions, with said first subcoil portion having a first plurality of winding turns and said second subcoil portion having a second plurality of winding turns, and wherein said first and second subcoil portions are wound in different, circumferentially offset pairs of said slots and coupled to designated pairs of commutator segments of a commutator; wherein a first pair of said coils are wound in an overlapping fashion such that the first subcoil portion of a second one of said first pair of coils is wound in the same slots as said second subcoil portion of a first one of said first pair of coils, and said second subcoil portion of said second one of said first pair of coils is wound in a pair of slots offset by one slot position from said slots that said second subcoil portion of said first one of said first pair of coils is wound in; and wherein a second pair of coils circumferentially adjacent said first pair of coils is further wound such that a first subcoil portion of a first one of said second pair of coils is wound in the same slots as said first subcoil portion of said second coil of said first pair of coils, and said second subcoil portion of said first one of said second pair of coils is wound in the same slots as said second subcoil portion of said second coil of said first pair of coils.