A Simple Analytical Method for Rotor Design of Synchronous Reluctance Machines

The rotor structure of synchronous reluctance machine (SynRM) involves some design complexities. These complexities make it impossible to employ a generalized design method valid for all machine topologies with the various number of rotor and stator slots till now. High amount of ripple in developed torque is a serious problem of SynRM that can be reduced by employing an effective design method. This paper presents a new SynRM rotor analytical design method with the target of reducing torque ripple while maintaining average torque. To this end, the proposed method is applied to a SynRM with 24 stator slots and 2, 3, and 4 rotor flux barriers. In order to evaluate the proposed method effectiveness, three rotors designed SynRMs electromagnetic performance is simulated using finite elements methods (FEM). It has been shown that the design parameters resulted by proposed analytical method is close to the optimal state obtained by preceding time consuming and complicated methods such as trial and error and optimization algorithms, etc.