A Space Vector Strategy for Smooth Torque Control of Switched Reluctance Machines

Abstract

A new space vector torque control strategy is developed for switched reluctance machines. The method is based on an existing space vector control strategy, which yields an explicit expression for the phase currents realizing a desired torque at a given rotor position. With the improved strategy, a higher torque-current ratio is achieved. A new approach based on space vector trajectories is given to determine the commutation between phases. For a constant reference torque, the improved method guarantees continuous reference currents. Therefore, smooth torque control is possible for a wide speed range and servo-grade performance can be achieved.