Considerations of Direct Torque Control for Switched Reluctance Motors

Switched reluctance motors (SR motors) have attracted so much attention because its desirable features, including simple construction, high reliability and low cost. In addition, the useful technique called direct torque control (DTC), that has been confirmed at induction motors (IMs) and blushless DC motors (BLDCMs), has been proposed applied to SR motors. But basic principle of SR motors is different from IMs and BLDCMs, the recognition of DTC for SR motors similar to IMs and BLDCMs are incorrect mistake. In the paper, we study the DTC technique applied in SR motors, and give a physical expression about the DTC technique used in SR motors. Some considerations about difference from conventional motors have been invested and some important inherent characteristics of DTC technique used in SR motors have been cleared