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机的演变过程，析了所用磁石，体或钕硼的性能优劣，并进行了市场前景展望。