Bipolar excitation for double three-phase full bridge converter based three-phase switched reluctance motor drive system

This paper propose a torque performance improving method for the bipolar excitation using the commercial three-phase full bridge converter based Switched Reluctance Motor (SRM) motor drive system. In order to control the current in each phase more flexible without any coupled effect among phases, the 2 units or double standard three-phase full-bridge power modules are used. The concept of current command with superimposed DC offset for the bipolar excitation scheme of those double standard three-phase full-bridge converter bases SRM drive system is proposed for torque performance improvement. The relation between the current and generating torque based on the proposed excitation scheme and power circuit configuration is analyzed, and the condition for the maximum average torque is also determined. The proposed method is verified on 1.5 kW, 3-phase 6/4 pole SRM.