dynamos

He has a bicycle with lights powered by a dynamo.

他自行车的灯由发电机提供能源。

Evolving process of hub dynamo which used in bicycle is presented. The performance of magnetite viz. ferrimagnetism or NdFeB is analyzed. The prospect of marketing is viewed.

摘要介绍了自行车的花鼓式发电机的演变程，分析了所磁石，即铁钕铁硼的性能优劣，并进行了市场前景展望。