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介紹電動自行車原理和維修技術。電機型號繁多，行業對電機命名標準舉例如下：
命名舉例：160SXPX03C，表示外徑160mm，稀土永磁線繞盤式直流電機，廠家03C類產品。什麼是有刷低速電機?其結構怎樣? 有刷低速電機轉動時，線圈電流方向的變化依靠換向器和電刷來完成。該有刷電機的線圈和換向器高速轉動而磁鋼和電刷則不轉動。低速有刷電機指低速、轉矩大、無齒的有刷電機，其轉子和車輪轉速一致。一般情況下，轉子電樞槽數為39～57個，定子上的磁鋼為5～7對。有刷高速電機有何特點?
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