| 摘要 |
PROBLEM TO BE SOLVED: To effectively cool a motor drive portion without the need for a special flow path and therefore without the need for the increase in outside dimension.SOLUTION: A pump device includes a pump chamber A whose pump casing 50 houses a rotor 20 which has an impeller 30 and a plurality of magnets 21 and is rotatably attached to a shaft 10 and from which a fluid sucked is discharged, a motor chamber B whose motor casing 80 houses a stator 60 including a plurality of stator cores 61 and coils 63 which is annularly arranged in a position axially opposite to the magnets 21 of the rotor 20 and a motor drive portion 70 axially opposing to the stator 60 and having a circuit substrate 71 mounted with a semiconductor device 72 for switching and controlling a current supplied to the coils 63, and a water-proof partition plate 90 between the pump chamber and the motor chamber. The semiconductor device 72 is disposed opposite to the axial other side surface of the stator core 61 to be heat-transferably connected to the axial other side surface of the stator core 61. |
