ABSTRACT
Many industrial automation applications need variable-speed operation for improving energy efficiency or product quality. Electric drives are preferred in variable-speed applications for their ease of control, clean operating environment, and easy access of electricity at the point of use. DC motors are easiest to control and are commonly used in such applications. This chapter shows the use of iterative learning control to improve the torque control performance of Switched reluctance motors. With improved torque control, SR drives can be used for high-performance motion control applications. SRM works on reluctance torque principle. It is equivalent to an electromagnet pulling a piece of soft iron toward it, so that the reluctance of the associated magnetic circuit is minimized. Assuming SRM to operate in linear magnetic region and that magnetic flux crosses the air gap only at 90°, phase inductance can be idealized to be directly proportional to the overlap angle between stator and rotor poles.
