In DC motor, the locality of axis of armature MMF was determined by the brush position, here the brush possessed a function of clamping.
直流电动机中电枢磁动势的轴线位置是由电刷位置决定的，电刷具有箝位的功能。
By getting the direction function from the output AC current, the applied time of voltage vectors in one PWM period was chosen, the direction of central current was controlled for DC voltage balance.
该方法通过实时检测三相交流输出电流方向得到方向函数，利用该函数选择一个PWM周期内不同电压矢量作用时间来控制中点电流的方向，实现电压平衡。
In order to achieve power steering function in fuel cell bus, an electrohydraulic system is proposed, where the pump is directly driven by a DC motor through an axis coupler.
为了实现燃料电池电动客车的动力转向功能，提出了直流电机通过联轴机构直接驱动油泵的电动液压式动力转向系统。
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