| 摘要 |
An electric motor that includes a first rotor, a second rotor, a first permanent magnet, a second permanent magnet, a stator, an electromagnet, a shaft, a shaft rotation position sensor and an electric switch, the first rotor being mounted on the shaft, the second rotor being mounted on the shaft and separated from the first rotor by the stator, the first permanent magnet being located in the first rotor, the second permanent magnet being located in the second rotor, the north south orientation of the first permanent magnet being the same as the north south orientation of the second permanent magnet, the north south axis of the first and second permanent magnets each being spaced radially from the longitudinal axis of the shaft, the north south axis of the first and second permanent magnets each being about parallel with the longitudinal axis of the shaft, the north south axis of the first permanent magnet being spaced rotationally from the north south axis of the second permanent magnet, the electromagnet being located in the stator so that when the electromagnet is energized the north south axis of the electromagnet is about parallel with the longitudinal axis of the shaft and spaced radially from the longitudinal axis of the shaft, the shaft rotation position sensor being positioned to sense the rotation position of the shaft so that the electromagnet can be energized by way the electric switch at a rotation position of the shaft when the first, the second or both the first and second permanent magnets are near the electromagnet to cause the shaft to rotate.
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