This paper describes a topology with a parallel operation of PWM inverters for high speed motor drive systems. High speed motors have been widely used in industries to reduce system size and improve power conversion efficiency. However, the high speed motors sometimes suffer from core losses caused by PWM current ripples; noting that the phase inductance, Ls, of a high speed motor is smaller than that of ordinary motors, it is significant that the current ripple generated by a Pulse Width modulation(PWM) inverter becomes noticeable in the high speed motor. In the proposed topology, three PWM inverters are connected in parallel through nine coupled inductors. Compared to the PWM current ripple of the conventional single inverter system, that of the proposed scheme can be conspicuously reduced without the voltage drop at the inductors. In this paper, a theoretical analysis of the output voltage of the proposed topology is presented, and then the validity of the proposed method is verified by experimental results.
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机译：本文介绍了一种用于高速电机驱动系统的具有PWM逆变器并联运行的拓扑。高速电动机已广泛用于工业中，以减小系统尺寸并提高功率转换效率。但是，高速电机有时会遭受由PWM电流纹波引起的铁芯损耗。注意到高速电动机的相电感L s 小于普通电动机的相电感，重要的是，由脉宽调制（PWM）逆变器产生的电流纹波在电动机中变得明显。高速马达。在提出的拓扑中，三个PWM逆变器通过九个耦合电感器并联连接。与传统单逆变器系统的PWM电流纹波相比，可以显着降低所提出方案的纹波，而不会在电感器上产生电压降。本文对所提出的拓扑结构的输出电压进行了理论分析，然后通过实验结果验证了所提出方法的有效性。
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