direct current supply meaning in English

直俩电
直流供电

The rectifier scheme that direct current supplying with power electronic equipment is obtained by alternating current being rectified is widely applied in power electronics field . however , the rectifying circuits result in input current distortion , input power factor greatly decrease
从电网获取交流电经整流后为设备提供直流电是电力电子技术中应用极为广泛的一种整流方案，然而由这种整流方案设计的电路使输入电流产生严重的畸变，其谐波电流严重污染了电网，输入端功率因数大大下降。
Abstract in this paper the phase commutation and current curves of brushless motor variable - speed system are studied . according to the results that the pulsating torque is influenced greatly by the ratio of the direct current supply voltage and the electromotive force of the motor , an approach to reduce the pulsating torque is presented
本文通过对无换向器电动机模型的换相过程和电流波形的研究，得到换相转矩波动受直流电源电压和电动机电动势幅值的比（ u / e ）的影响较大的结论并获取了最佳u / e ，同时通过仿真研究了电流波形，提出了减小转矩脉动的控制策略。