| 摘要 |
<p>A motor unit of which the size is reduced by reducing the space of a control circuit section. In the motor unit integrating a motor and a drive control section (4), the drive control section (4) has a stack structure where two circuit component containing sections (33, 34) are arranged three-dimensionally with a bus bar (37) being arranged between both containing sections (33, 34). A printed wiring board (38) mounting signal system circuit components, e.g. a rotation sensor (40) and a position sensor (41), is arranged in the circuit component containing section (33). Power system circuit components, e.g. an FET (44) and a relay (45), are arranged in the circuit component containing section (34). The power system circuit components are mounted directly on the bus bar (37) and arranged substantially in parallel with the printed wiring board (38) across the bus bar (37). The circuit component containing section (34) is arranged on the outer surface side of the unit with respect to the circuit component containing section (33) and a heat sink (32) is fixed to the outside thereof.</p> |
