| 摘要 |
An electric fan includes a motor driving circuit, a controller, and a stepless speed-change device; the motor driving circuit is electrically connected to a blades-driving motor of an electric fan as well as a power circuit; the controller is electrically connected to the motor driving circuit while the stepless speed-change device is electrically connected to the controller therefore the rotational speed of the blades-driving motor of the electric fan can be adjusted in a stepless manner.
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