| 摘要 |
A pump motor includes a stator, a rotor and a housing accommodating the stator and the rotor. The stator has a plurality of teeth, each of the teeth being provided with a cap portion at its tip end. The rotor is arranged inside the stator in an opposing relationship with the cap portion of each of the teeth. The housing includes a fluid path defined therein. The fluid path includes a substantially annular gap axially extending between the stator and the rotor. The cap portion includes a first opposing surface and a second opposing surface provided in an opposing relationship with the rotor to define a portion of the fluid path, the distance between the first opposing surface and an outer circumferential surface of the rotor being greater than the distance between the second opposing surface and the outer circumferential surface of the rotor.
|
