A motor surge voltage suppression method with surge energy regeneration

A novel motor surge voltage suppression method is proposed in this paper. Features of the proposed method are that (1) no requirement for an inductor-capacitor (LC) filter for suppression of the motor surge voltage on the motor terminal, (2) the energy stored in the main power cable, which causes the motor surge voltage, is regenerated to the inverter dc-bus line, and (3) the motor surge suppression effect is not influenced by the power cable length. Therefore, this method has advantages in volume and efficiency compared with conventional surge suppression methods. The circuit configuration of the system is presented and the operation principle is explained. The method for design of the circuit parameters is shown. Surge suppression effectiveness of this method is confirmed through the experimental results.