A Tail Structure Driving System for Switched Reluctance Motor Using Full-Bridge Power Converter

To use modular full-bridge power converter to drive switched reluctance motors (SRMs) while maintaining the SRM operation principle, this article proposes a tail structure driving system and a corresponding trapezoidal current control method. The three-phase windings of an SRM are connected in a star configuration, and an additional power switch leg controls the neutral point current, ensuring that the windings are excited within the working area. This allows the SRM to be driven by a full-bridge power converter. The trapezoidal current control method is used to analyze the winding currents and tail current in the SRM, calculating the reference value of the tail current that minimizes the winding copper losses while enabling SRM operation. Simulation tool is employed to validate the proposed driving system and its control method. The results are compared with those of an SRM driven by an asymmetric half-bridge power converter using the pulse current control method. The findings indicate that the proposed driving system structure and control method can effectively drive the SRM, reducing torque and speed ripples.