Integrated inverter unit for a motor-generator

The invention relates to an inverter device (50) which is mounted on the rotating electric machine body (1). The inverter device (50) includes a module unit (52) having a converter circuit (53) and a control unit (51) that controls the operation of the converter circuit (55). The converter circuit (55) is configured by connecting a plurality of the following series circuits in parallel, each of the series circuits includes a P-channel MOS semiconductor device disposed at a higher potential side and an N-channel MOS semiconductor device disposed at a lower potential side which are electrically connected in series. An electric power that is supplied from a battery (150) or an electric power that is supplied to the battery (150) is controlled.