ELECTRIC MOTOR AND METHOD FOR FIXING STATOR OF THE ELECTRIC MOTOR

PROBLEM TO BE SOLVED: To provide a method for fixing the stator of an electric motor, having little loss and deterioration of materials by minimizing a range where a compression stress applied to an iron core, in particular, a yoke portion which the stator influences, and to provide a high-efficiency electric motor. SOLUTION: The stator of the electric motor has a segment-shape convex portion on the outer circumference of a yoke, and a case of the electric motor has a segment-shape concave portion on the inner circumference. Furthermore, a coupling portion is provided to couple the stator of the electric motor and the case of the electric motor by mating the convex portion to the concave portion, and a gap is provided between the outer circumference of the yoke of the stator of the electric motor and the inner circumference of the case of the electric motor, excluding the coupling portion between the stator of the electric motor and the case of the electric motor. In addition, to obtain higher motor efficiency, the cross-sectional shape of the end of the convex portion is preferably formed in a spiral, in the direction of the rotating shaft of the electric motor. COPYRIGHT: (C)2009,JPO&INPIT