dynamos

He has a bicycle with lights powered by a dynamo.

他自行车上的灯由提供能源。

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.

摘要介绍了自行车上使用的花鼓式的演变程，分析了所用磁石，即铁氧体或钕铁硼的性能优劣，并进行了景展望。