Patent ID: 7105969

Claim:
A permanent magnet D.C. electric motor comprising: a stator housing, permanent magnet structure carried by the stator housing for creating a fixed magnetic flux field therein, an armature assembly installed in the stator housing, the armature assembly comprising a shaft rotatably mounted in the stator housing, lamination structure, first and second coil windings associated with the lamination structure, a first commutator electrically connected with the first coil winding, and a second commutator electrically connected with the second coil winding, each of the first and second commutators being generally cylindrical and having a plurality of commutator segments, commutator segments of the first commutator that are disposed 720/N degrees apart being electrically interconnected and commutator segments of the second commutator that are disposed 720/N degrees apart being electrically interconnected, wherein N is the number of magnetic poles of the motor and is an even integer greater than 2, and a brush card assembly including a single brush card including a high speed side having first brush structure including first brushes operatively associated with the first commutator, and a low speed side opposite the high speed side, the low speed side having a second brush structure including second brushes operatively associated with the second commutator, wherein the number of first brushes is two and the number of second brushes is two, regardless of the valve of N.