Patent ID: 9325215
Filing Date: 2016-04-26
CPC Classification: H02K

Claim Text:
1. An inner-rotor-type motor, comprising: a stator including a stator core and a coil, the stator core including a ring-shaped core-back portion and a plurality of main poles protruding radially inward from the core-back portion, the coil being wound around each of the plurality of main poles through an insulator; a rotor rotatably arranged inside the stator to face tip ends of the plurality of main poles and provided with a rotor shaft extending along a center axis; and cover members arranged to cover axial opposite sides of the stator and configured to hold bearings which support the rotor shaft; wherein the core-back portion of the stator core has a square or substantially square shape; the core-back portion includes side surfaces corresponding to four sides of a square; the side surfaces of the core-back portion are configured to define motor outer surfaces; the insulator includes two insulating members mounted to the stator core at the axial opposite sides thereof; each of the two insulating members includes a plurality of slot insulating portions which covers the main poles and an octagonal or substantially octagonal frame portion which interconnects the plurality of slot insulating portions at an axial end surface side of the stator core; each of the frame portions includes four outer surface portions flush or substantially flush with the motor outer surfaces of four sides of the core-back portion; each of the cover members includes an end plate portion configured to define an end surface of the motor and provided with a bearing holding portion in a central region thereof, and four leg portions arranged in four corners of the end plate portion and configured to contact axial end surfaces of four corner portions of the stator core; each of the outer surface portions of the frame portion of each of the insulating members is inserted between the leg portions of each of the cover members; and each of the frame portions includes a base-side ring-shaped frame having a diameter slightly smaller than an outer diameter of the stator core, a tip-end-side ring-shaped frame having a diameter equal or substantially equal to the outer diameter of the stator core, and a ring-shaped thin portion which interconnects the base-side ring-shaped frame and the tip-end-side ring-shaped frame.