| 摘要 |
A pump comprises a rotor and a stator which generates the magnetic field which rotates the rotor. The rotor has an impeller and a permanent magnet. The rotor has an axial direction, a circumferential direction, and a radial direction. The rotor has a through hole extending in the axial direction. The permanent magnet is made of bond magnet, whereby the permanent magnet is formed to have a weld line extending from an inside of the radial direction to the outside of the radial direction. The permanent magnet further comprises the magnetic poles arranged in the circumferential direction. The magnetic poles are arranged to form the boundary therebetween. The through hole is displaced from the weld line in the circumferential direction. The through hole is displaced from the boundary in the circumferential direction.
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