Patent ID: 7224092

Claim:
A brushless motor comprising a rotor assembly and a stator assembly, wherein the rotor assembly includes: a shaft; a rotor frame having the shaft; and a rotor magnet disposed on inner wall of the rotor frame, wherein the stator assembly includes: a bearing for supporting the shaft; a bearing housing for holding the bearing; a bracket having the bearing housing and having a cylindrical protrusion with a first through hole formed in the cylindrical protrusion; a stator core having a plurality of salient poles confronting to the rotor magnet and disposed outside the bearing housing; a stator coil wound via an insulator on each one of the salient poles of the stator core; and a circuit board having: a hall element for detecting a magnet pole of the rotor magnet mounted on the circuit board, a second through hole formed in the circuit board, and an end of the stator coil is electrically coupled to the circuit board, wherein the circuit board is rigidly mounted to the bracket such that the cylindrical protrusion of the bracket is situated in the second through hole of the circuit board and the protrusion and the through hole are situated between adjacent two salient poles among the plurality of the salient poles and corresponding to tips of the two adjacent salient poles.