Brushless motor

摘要

An outer rotor brushless motor comprising a housing; an electric parts protecting casing on which the housing is mounted; a drive circuit installed in the casing for energizing the coils of the stator, the drive circuit including a plurality of switching elements each changing the direction of electric current flowing in the corresponding coil of the stator; a control circuit installed in the casing for controlling operation of the switching elements to adjust a rotation speed of the drive shaft; electric connectors for connecting the drive and control circuits; and a heat sink held by the casing, the heat sink including a hidden portion exposed to an interior of the casing and a plurality of heat radiation fins exposed to the outside of the casing, the hidden portion having the switching elements attached thereto. The drive circuit and control circuit are arranged on respective substrates which are arranged at different positions in the electric parts protecting casing. The drive and control circuits are connected through electric connectors.