Collectorless external-rotor motor with semiconductor cooling system

摘要

The invention relates to a collectorless direct-current external-rotor motor (2), which includes a stator (6) with stator windings (12) fastened to a motor flange (4), an external rotor (14) enclosing the stator (6) on its side facing away from the motor flange (4), as well as an electronic circuit arrangement (18) driving the stator windings (12). This circuit arrangement (18) has a conductor plate (24) provided with electronic components (22) arranged adjacent to the flange-side facing the stator (6), as well as several power semiconductors (28) electrically connected to the conductor plate (24), arranged in heat-conducting contact with the motor flange (4). The power semiconductors (28) are joined indirectly by an annular disk-form cooling body (40) to the motor flange (4) to provide a heat-conducting effect. The cooling body (40) forms a preassembled component with the conductor plate (24) and a carrier element (42) which support the conductor plate (24).