| 摘要 |
A power drive assistant system includes a wheel mover detachably fastened to the seat tube of a bicycle and holding an external rotor motor in friction contact with the rear wheel of the bicycle and controllable to rotate the rear wheel of the bicycle by means of a friction force, a rechargeable battery pack mounted on the seat pillar of the saddle of the bicycle to provide the external rotor motor of the wheel mover with the necessary working voltage, and a speed controller mounted on the handlebars of the bicycle for regulating the speed of the external rotor motor.
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