Abstract
Common-mode voltage (CMV) exists at the terminal of motor windings when fed by voltage source inverters under pulse width modulation (PWM). For a long time, researchers devoted much effort to suppress or eliminate the CMV. From the perspective of energy utilization, this article proposed a method of powering the load by collecting the energy of CMV. This paper derived the common-mode equivalent circuit, discussed the factors that affect the CMV power capacity, and quantitatively analyzed the maximum power transmission of CMV. Moreover, a compensation method with a resonant capacitor was proposed, which can increase the power capacity of CMV to more than 2 times of the original power output in the experiments. In practical applications, the method provided an auxiliary source inside the motor to power a 2W motor encoder or even a monitoring system, which replaced the original power supply cable connected to the inverter. Furthermore, the influence brought by the proposed method on conducted EMI and stability issues of the motor drive system was evaluated. Experimental results validate the accuracy of quantitative analysis and effectiveness of the proposed method.
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