High-performance torque control of switched reluctance motor

Motor torque ripples may cause speed ripples at low speed operation. Switched Reluctance Motor (SRM) produces excessive torque ripples due to discrete excitation of phase windings and its non-linear magnetization characteristics. A new polynomial model in phase current and rotor position is developed for representing SRM flux-linage and torque, which is both accurate and computationally simple for real-time controller implementation. Both indirect torque control (IDTC) and direct torque control (DTC) approaches have been explored for phase torque tracking control. Advanced model-free and model-based nonlinear control techniques have been investigated. Iterative learning control (ILC) is used for constant torque reference where phase torque references are periodic in rotor position. In ILC based control scheme, a learning gain is the only design parameter that is obtained from simplified phase inductances profile. ILC has been tested in both IDTC and DTC schemes for SR drive. A novel nonlinear robust tracking control (NLRTC) method is proposed for DTC of SRM and can be used for varying motor torque references. Detailed experimental results of the proposed schemes for a prototype SRM are provided.

Author dc:creator

• SAHOO SANJIB KUMAR

• switched reluctance motor, SRM torque control, SRM torque ripples, SRM modelling, Direct Torque Control of SRM