Abstract: A pump device includes a pump housing including a fluid chamber for inhaling a fluid flowing through the fluid chamber via an intake port and discharging the fluid to an outside via a discharge port, a motor housing including a stator, and a shaft whose one end projects into the pump housing and to which an impeller is assembled and whose the other end is rotatably supported by a first bearing portion within the motor housing. The pump device also includes a rotor assembled to the shaft and facing the stator, and a bearing plate disposed between the pump housing and the motor housing and including a second bearing portion rotatably supporting the shaft. The bearing plate is formed by a first fluid passage for leading the fluid to the bearing plate.

Abstract: A partition partitions off a motor chamber and a pump chamber, through which a cooling water flows, a substantially cylindrical-cup shaped rotor is arranged in the pump chamber, a circuit board is disposed in the motor chamber to be in parallel to an annular-shaped end surface of the rotor, a magnetism detecting element is mounted on that portion of the circuit board, which faces a magnet portion of the rotor, and exothermic electronic parts are mounted on the remaining portion of the circuit board.

Abstract: A partition partitions off a motor chamber and a pump chamber, through which a cooling water flows, a substantially cylindrical-cup shaped rotor is arranged in the pump chamber, a circuit board is disposed in the motor chamber to be in parallel to an annular-shaped end surface of the rotor, a magnetism detecting element is mounted on that portion of the circuit board, which faces a magnet portion of the rotor, and exothermic electronic parts are mounted on the remaining portion of the circuit board.