| 摘要 |
The invention provides a motor-assisted drive unit for a motor-assisted vehicle, which is made as small in size as possible. A first control board (136) on which control devices of a drive motor (21) are mounted is disposed in a casing (94). In this case, the first control board (136) extends in the direction nearly perpendicular to the motor shaft of a motor (21); and at least part of the first control board (136) extends, as seen along the axial direction (A) of the motor (21), to a position at which it is overlapped to the motor (21). The second control board (135) is overlapped to part of the first control board (136). As a result, it is possible to dispose a CPU (20) having a relatively large mounting area on a portion, overlapped to the motor (21), of the first control board (136), and hence to effectively use the inner space of the casing. Further, since the second control board (135) is configured as an aluminum board and is directly mounted on the inner wall of the casing (94), it is possible to effectively transfer the heat generated from a FET and the like mounted on the second control board (135). <IMAGE>
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