Patent ID: 7453175

Claim:
A brushless motor comprising: a shaft; a bottomed cylindrical housing disposed coaxially with the shaft, whose bottom is disposed on an axially lower side and whose opening is disposed on an axially upper side; a bracket having a first bracket part fixed to the opening in the housing and including an opening hole in a center which is disposed coaxially with the shaft, and a second bracket part having a cylindrical part inserted in the opening hole in the first bracket part and an expanded part formed on the axially upper side of the cylindrical part and having an axial top face protruding from an axial top face of the first bracket part; a first bearing part held on the bottom of the housing and fixed to the shaft; a second bearing part held by the cylindrical part of the second bracket part and fixed to the shaft; a resolver having a resolver stator held by the cylindrical part of the second bracket part and disposed on the axially lower side of the second bearing part, and a resolver rotor fixed to the shaft so as to face the resolver stator via a gap; a rotor magnet installed to the shaft, the magnet surrounding the shaft and being rotatable together with the shaft as rigid one assembly; and a stator disposed so as to face the rotor magnet via a gap and fixed to an inner peripheral surface of the cylindrical part of the housing, wherein a plurality of through holes each having an approximately circular arc shape are circumferentially formed in the expanded part of the second bracket part, a fixing hole is formed in an almost radially same position as that of the through hole, in the first bracket part, a fixing member is inserted in the through hole in the second bracket part and is screwed in the fixing hole in the first bracket part, and the second bracket part is circumferentially movable with respect to the first bracket part.