| 摘要 |
Provided is a compact, vibration- and noise-reducing motor drive device used in, for example, an electric power steering device for a vehicle. A motor drive control device (30) comprises: a heat sink (50) and a housing (40). The heat sink is arranged on a front or rear side of a motor (10), a switching element (73) for performing a drive control for the motor being mounted in the heat sink. The housing is joined to the heat sink, and either couples the heat sink to a frame or covers the switching element mounted in the heat sink. The surface (110) of contact of the heat sink with the housing is in a single plane intersecting the direction of the axis of rotation of the motor; and threaded holes (42, 52) for joining the frame, the heat sink, and the housing together are provided so as to be in positional alignment in the circumferential direction. |
