Stepping motor has certain step distance, have no cumulative error precision.

步进电机有一定的步距精度，没有累积误差。

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Step motor control, by pulse by changing the order of electricity can change the motor rotation direction, change the pulse frequency can change the motor rotation speed.

步进电机受脉冲的控制，通过改变通电的顺序可改变电机的旋转方向，改变脉冲的频率可改变电机的旋转速度。

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This current-decay control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.

此电流衰减控制方案成果在减少声响马达的噪声，提高一步的准确性，并降低功耗。

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One new device, the iWalk prosthetic foot and ankle, uses a chip-controlled motor to propel amputees forward in the latest step toward robotic legs.

WSJ: Boston Marathon Amputees Face New Reality

Ford Motor surprised investors this morning who had long been expecting current CEO Alan Mulally to step aside, announcing that he would remain in the top job until at least 2014.

FORBES: Ford Shares Should Pop On Word Alan Mulally Will Remain CEO Through 2014

Ahead of the meeting, Mosley had insisted that he would not step down as part of any potential agreement and might even seek re-election as head of world motor sport.

BBC: F1 deal ends threat of breakaway