Patent ID: 8350420

Claim:
A winding method of an electric motor, comprising: assembling a frame having a magnet on an inner circumference, a shaft rotatably supported by said frame, a rotor core fixed to said shaft, one coil wire wound around said rotor core, and a commutator fixed to said shaft and connected to said coil wire, wherein said rotor core has n pieces of teeth arranged in a circumferential direction around which said coil wire is wound, wherein said commutator has n pieces of segments, wherein said coil wire has a connecting wire portion that connects said teeth and said segments and a crossover portion that interconnects said segments at opposite pole positions of said commutator around said shaft, wherein said crossover portion that connects an i-th segment of said segments and an (i+n/2)th segment of said segments is wound prior to said connecting wire portion that connects the teeth connected with the i-th segment and the (i+1)th segment, respectively, and wherein i ranges from 1 to n.