Patent ID: 9716418
Date: 2017-07-25
CPC Classifications: H02K

Claim:
1. A brushless DC motor comprising: a stator, which has a core that has a plurality of teeth, an electrically insulating member fitted on the core, and drive coils wound on the teeth with the electrically insulating member therebetween; a rotor, which has a rotary shaft and a magnet that has a plurality of poles fitted on the rotary shaft, and which is arranged inside the stator with a gap therebetween; a plurality of magnetic sensors, which detect the positions of the poles of the magnet; and a sensor board, on which a plurality of magnetic sensors are fixed in place, wherein the electrically insulating member has a plurality of engagement claws, which extend in the axial direction of the rotary shaft, and a plurality of positioning projections, at positions in the circumferential direction differing from those of the engagement claws, which extend further than the engagement claws in the axial direction of the rotary shaft, and wherein the sensor board has a plurality of engagement parts, which engage with the plurality of engagement claws, and a plurality of positioning recesses, into which the plurality of positioning projections are inserted; and wherein the plurality of positioning projections extend in the axial direction of the rotary shaft further than the plurality of engagement claws by no less than half of the thickness of the sensor board.