事实上液压节气门减慢了驱动器的速度以防止损坏。

There is in fact so much speed in the actuator that hydraulic restrictors are used to slow it down and prevent damage.

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而当HDD的容量指数级增加时，这些驱动器的速度并没有实现显著增长。

And while the capacity of HDDs has grown exponentially, the speed of these devices has not significantly increased.

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采用伺服驱动器的速度控制和位置控制相结合的方法实现天车定位和吊臂运动的精确控制。

The combination of speed control and location control of servo driver realized the accurate control of crane's location and steeve's movement.

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