MOTOR

摘要

A motor includes a shaft, a rotor magnet, an armature, an upper bracket, a lower bracket, and a fixing member. An insulator includes magnetic pole tooth insulating portions, each of which covers a separate one of magnetic pole teeth, and a core back insulating portion configured to cover at least portions of upper and lower end surfaces of a core back. A stator core includes a fixing member arranging portion. The core back insulating portion includes a core back insulating projecting portion configured to project in an axial direction away from a surface covering the core back, and including a radially inner surface located radially inward of a radially inner end of the fixing member arranging portion. The core back insulating projecting portion includes a cut portion at a position radially opposed to the fixing member.

主权项

1. A motor comprising:
a bearing portion including an upper bearing and a lower bearing; a shaft, including a central axis extending in a vertical direction as a center thereof, rotatably supported by the bearing portion; a rotor magnet configured to rotate together with the shaft; an armature arranged radially outside the rotor magnet; an upper bracket arranged axially above the armature, and configured to hold the upper bearing at a radial center thereof, the upper bearing being configured to rotatably support the shaft; a lower bracket arranged axially below the armature, and configured to hold the lower bearing at a radial center thereof, the lower bearing being configured to rotatably support the shaft; and a fixing member configured to extend in the vertical direction, and configured to fix the armature to each of the upper and lower brackets; wherein the armature includes:
a stator core including an annular core back and a plurality of magnetic pole teeth configured to project radially inward from the core back;an insulator configured to cover at least an upper surface and a lower surface of each of the plurality of magnetic pole teeth of the stator core; andcoils each of which is defined by a conducting wire wound around a separate one of the plurality of magnetic pole teeth with the insulator intervening therebetween; the insulator includes:
magnetic pole tooth insulating portions each of which is configured to cover a separate one of the plurality of magnetic pole teeth; anda core back insulating portion integrally provided with each of the magnetic pole tooth insulating portions as a single monolithic member, and configured to cover at least portions of upper and lower end surfaces of the core back; the stator core further includes a fixing member arranging portion configured to have the fixing member inserted therethrough in an axial direction, located radially outside one of the plurality of magnetic pole teeth, and defined by a through hole or a cut recessed radially inward from a radially outer circumference of the stator core; the core back insulating portion includes a core back insulating projecting portion configured to project in the axial direction away from a surface covering the core back, and including a radially inner surface located radially inward of a radially inner end of the fixing member arranging portion; and the core back insulating projecting portion includes a cut portion at a position radially opposed to the fixing member.