Patent ID: 7728476

Claim:
An inner rotor brushless motor where a rotor is disposed in a space surrounded by a ring-shaped stator, wherein the rotor and the stator are enclosed inside a sealed case assembled by covering an attachment base with a cup-shaped bracket, the rotor includes a cup-shaped rotor yoke and magnets that are provided on an outer circumferential surface of the rotor yoke, and is coupled to a motor shaft at a center of an opening of the rotor yoke, the motor shaft is supported on a bearing portion provided in a center of the bracket opening, the rotor is rotatably assembled on the bracket with the opening of the rotor yoke facing the base portion inside the bracket opening, and a motor substrate on which a motor driving circuit is formed is provided in a gap formed in an axial direction between (i) the rotor and the stator and (ii) a base portion inside a bracket opening of the bracket.