| 摘要 |
Disclosed in a motor-generator, which is both a motor and a generator, wherein a permanent magnet is provided around a shaft such that the permanent magnet can rotate together with the shaft, an electromagnet is provided, a coil is provided around the permanent magnet, a device for activating/inactivating the electromagnet is provided, a secondary battery is used to activate the electromagnet, the electromagnet rotates the permanent magnet, and the rotating permanent magnet generates electricity at the coil. |
