| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump device capable of enhancing driving torque of an impeller while reducing the number of part items and the size more than a magnet coupling system. SOLUTION: In a pump device 1 having a DC brushless motor 12 having a rotor having a permanent magnet 11 and a stator 10 having plural iron cores 41 wound with a coil 13a as a rotary driving source of an impeller 15 rotatably arranged in a pump chamber 27 for circulating fluid, the permanent magnet 11 is embedded in the impeller 15, this is formed as a rotor, the iron cores 41 are composed of plural thin plate-like members laminated in the direction (the arrow A direction) orthogonal to a rotary shaft 16 of the impeller 15, and are separated by a partition wall 35 to the impeller 15 in the pump chamber 27 to be oppositely arranged, and the opposite side of a position opposed to the impeller 15 of these iron cores 41 is fitted/fixed by a back yoke 42.
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