When running, the motor drives the spindle and the power wheel to rotate speed.

运转时，电机带动主轴及动力盘高速旋转。

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They can provide power to the wheel motors or help recharge the batteries.

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But GM says the next-generation technology could power rear-wheel-drive cars as well, such as the Cadillac XTS concept car, which was on display at the recent Detroit auto show.

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Controlling steering using electric motors also helps to reduce fuel consumption and hence carbon-dioxide emissions. (Electric motors require power only when the steering wheel is turned, whereas a hydraulic pump drains power from the engine all the time.) Ford reckons 90% of its cars will have electronic steering within three years.

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