High carrier-frequency Pulse Width Modulation (PWM) is a popular and widely used method for driving the induction motors in Electric Vehicles (EVs) using voltage source inverters. However, it often generates high-frequency Common Mode (CM) voltages, resulting in shaft voltages. This, in turn, leads to a flow of leakage current to the earth, known as CM current, which can cause serious problems, including premature failure of the ball bearings in the motor. This paper introduces an Active Cancellation Circuit (ACC) method aimed at extensively reducing the CM current and, consequently, the CM voltage in three-phase induction motor drives. In this technique, Y-configured capacitors are employed for detecting CM voltage. After amplification, this voltage is applied to the motor frame to eliminate both the CM current and the CM voltage. Unlike conventional voltage compensating techniques, the proposed approach eliminates the need for a CM transformer between the inverter and the motor. As a result, there is no need for a high-power-rated CM transformer or any of its associated losses. To assess the effectiveness of the proposed method, experiments were conducted using an induction motor (3-phase, 1.1 kW, 415 V/60 Hz) connected to a two-level three-phase voltage source inverter.

高载波频率脉宽调制 (PWM) 是一种流行且广泛使用的方法，用于使用电压源逆变器驱动电动汽车 (EV) 中的感应电机。然而，它经常产生高频共模（CM）电压，从而产生轴电压。这反过来会导致漏电流流向大地，称为 CM 电流，这可能会导致严重问题，包括电机中的滚珠轴承过早失效。本文介绍了一种主动消除电路 (ACC) 方法，旨在大幅降低三相感应电机驱动器中的 CM 电流，从而降低 CM 电压。在该技术中，采用 Y 配置的电容器来检测 CM 电压。放大后，该电压施加到电机框架以消除 CM 电流和 CM 电压。与传统的电压补偿技术不同，所提出的方法不需要逆变器和电机之间的共模变压器。因此，不需要高额定功率 CM 变压器或任何相关损耗。为了评估所提出方法的有效性，使用连接到两级三相电压源逆变器的感应电机（三相，1.1 kW，415 V/60 Hz）进行了实验。