目前国内外电动车直流驱动功率变换器使储能电源输出电流从零到电机电枢电流高频脉动，不利于延长动力电池的使用寿命。

At present power converters of DC driving system make power supply outputs a high-frequency pulsating current, which is from zero to the armature current. This large ripple damages batteries.

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在电动机里电流是由外电源供给的感生电动势的方向和电枢电流i方向相反。

Years in the motor current is outside the power supply from the induced electromotive force and the direction of armature current I in opposite directions.

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