A Motor Surge Voltage Suppression Method with Surge Energy Regeneration

Abstract

A method for motor surge voltage suppression is proposed in this paper. The proposed method has following advantages: (1) an LC filter is not required for suppressing the surge voltage at the motor terminal, (2) the energy stored in the main power cable, which cause the motor surge voltage, is regenerated to the inverter dc bus line, and (3) effective surge suppression is achieved stably regardless of the power cable length and power rating of the system. Consequently, the proposed method has advantage in volume and efficiency compared to conventional surge suppression methods. In this paper, the circuit configuration of the system is shown and the operation principle of the proposed method is explained. Effectiveness of this method is confirmed through the experimental results.