Patent ID: 7849584

Claim:
A method of manufacturing a permanent-magnet synchronous motor having a stator core fixed in a frame, the method comprising: measuring the cogging torque of the stator core before fixing the stator core to the frame, after measuring the cogging torque, making a specific region of the frame and a specific region of the stator core, respective reference positions of the frame and the stator core, and fixing the stator core and the frame together, after positioning the specific regions of the frame and the stator core in a specific positional relationship with respect to each other, wherein the specific positional relationship positions N locations, where N is a natural number, of pressurization of the frame, and the reference positions of the stator core and of the frame, to reduce cogging torque of the stator core, after fixing the stator core in the frame, relative to the cogging torque of the stator core, that has been measured before fixing the stator core in the frame.