A Motor Surge Voltage Suppression Method With Surge Energy Regeneration

A novel motor surge voltage suppression method is proposed herein. The features of the proposed method are that: 1) there is no requirement for an 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 voltage suppression effect is not influenced by the power cable length. Therefore, the proposed method offers advantages in terms of volume and efficiency compared with conventional surge suppression methods. The circuit configuration of the proposed system is presented and the operation principle is explained. The method used to design the circuit parameters is also presented. The effectiveness of the surge voltage suppression of the proposed method is confirmed experimentally.