according to one embodiment , four vvvf main circuit inverters for supplying electric power to drive a permanent - magnet synchronous motor are packaged into one unit . the four vvvf main circuit inverters are configured as a 4 - in - 1 inverter unit which shares a cooling mechanism for radiating heat generated due to power supply operation for the permanent - magnet synchronous motors to outside . a 2 - in - 1 semiconductor device package in which two semiconductor elements to convert electric power are packaged into one unit to be able to drive a permanent - magnet synchronous motor is contained in the 4 - in - 1 inverter unit . thereby , individual control of inverters and reducing the size of the entire apparatus can be achieved for the electric - vehicle control apparatus .