Phase To Phase Interleaved Method To Reduce The Common Mode Voltage For Seven Phase Bldcm Drive

This paper describes a method for reducing the common mode voltage in seven phase brushless DC motor(BLDCM) application. The conventional interleaved method used in the three phase inverter system has been extended and applied. The proposed phase-phase interleaved method is studied to apply the six-phase excitation method for controlling seven-phase BLDCM. The six-phase switching functions related with modulation index(MI) and interleaved angle are obtained. And the average of common mode voltage is derived by mathematically. The proposed control method reduces the common mode voltage generation by applying the optimal interleaved angle according to MI. The proposed method is verified by experimental results.