Patent ID: 8093852

Claim:
A motor control device comprising: a plurality of drive circuits that are respectively provided on arms of an inverter circuit that supplies current to an AC motor, the plurality of drive circuits driving respectively a plurality of switching elements included on the arms; a power source control circuit that performs a control of a plurality of power supply circuits that supply power respectively to the plurality of drive circuits; a low-voltage circuit area that includes the power source control circuit; a plurality of high-voltage circuit areas, each high-voltage circuit area including a drive circuit from the plurality of drive circuits; and a plurality of transformers that serve as the plurality of power supply circuits and respectively join the low-voltage circuit area and the plurality of high-voltage circuit areas in an insulated state, wherein the plurality of the high-voltage circuit areas are disposed aligned on both sides of the low-voltage circuit area such that the low-voltage circuit area is provided between the plurality of high-voltage areas and oriented with a predetermined insulation distance provided between the plurality of high-voltage circuit areas and the low-voltage circuit area.