研究了固体绝缘表面电荷对不均匀电场直流电晕起始电压、伏安特性的影响。

The effect of insulator surface charges on DC corona initial voltage and V-I characteristic in non-uniform field is studied.

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恒频脉宽调制细分驱动器比常见的直流电压斩波驱动器具有明显的优越性，不仅能够显著改善低频稳定性和高频矩频特性，而且能够有效地利用能量。

Not only has it improves the stability in low frequency and the torque-speed characteristic in high frequency of the stepping motor, and can utilize energy availably.

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