Effect of rotor geometry on Peak and Average Torque of direct drive External-Rotor Synchronous Reluctance Motor (Ex-R SynRM) in comparison with Switched Reluctance Motor for low speed domestic application

This paper deals with the feasibility of developing an External-Rotor Synchronous Reluctance Motor for a low speed direct drive domestic application. Here, an attempt is made to identify the rotor geometry which provides high peak, average torque and saliency ratio in comparison with the equivalent External-Rotor Switched Reluctance Motor which is developed and tested already for the same application. In this context, 6 different rotor geometries are considered for the feasibility study and performance characteristics are predicted using finite element analysis. These results are compared with equivalent size Ex-R SRM and finally, a feasible rotor geometry is proposed for further investigation and prototype.