Frequency power head, adjusting speed arbitrary, wide speed range.

变频动力头，转速任意调节，作用范围广。

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This speed range was chosen because it is when most collisions take place, especially rear-end shunts in slow-moving traffic.

之所以选择这样的速度范围，是因为大多数的碰撞都在此范围内发生，尤其是低速行驶时的追尾事故。

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But the step motor efficiency is low, the ability is not big, load drag pulse equivalent cannot too big, speed range is not big.

但步进电机的效率低，拖动负载的能力不大，脉冲当量不能太大，调速范围不大。

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For example: Key to the Ford hybrid's system big numbers is its all-electric speed range of up to 62 mph.

WSJ: 2013 Ford C-Max Hybrid Review: A Fine Car Falls Way Short on MPG | Rumble Seat by Dan Neil

To find America's fastest roads, Inrix first looked for stretches of roadway where motorists routinely drive fast, then it found the speed range at which each roadway's fastest 5% of drivers travel.

FORBES

When asked, some study participants expressed strong interest in having a vehicle that could drive itself, particularly for long trips when lane centering and full-speed range adaptive cruise control could help lighten the driver's workload.

ENGADGET: Cadillac road tests self-driving Super Cruise tech, could hit highways by mid-decade