它控制主轴马达转动和磁头运动。

It controls spindle motor rotation and heads movements.

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通过对硬盘主轴马达的反电动势与马达转速之间关系的分析，提出一种利用马达的反电动势信号跟踪马达转动速度变化，产生系统伺服写入时钟信号的方法。

By analyzing relation between BEMF of the hard disk spindle motor and the rotate speed. This paper presents a new method of following the motor rotate speed by PLL to lock BEMF.

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相对于其他卧式自行车，另一项微调是，斯托达德设计的踏板驱动的是前轮，而不是后轮；不过，有一个马达可以转动后轮。

In another tweak to the recumbent, Stoddard designed the pedals to power the front wheel instead of the rear; however, there is a motor that turns the back tire.

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