Torque characterization of a synchronous reluctance machine using an analytical model

The unique features of the synchronous reluctance machines such as fast dynamic response, simple rotor structure, and low cost have gained attention in recent years for many applications such as electric vehicles. In this paper the torque-angle curves of a synchronous reluctance machine which is designed and prototyped for traction applications are estimated using an analytical model. These curves which are obtained for various currents at different load angles, provide the required information that can lead to an optimized operation of the machine and a better performance of the electric vehicle. The analytical model proposed in this paper is based on the electromagnetic equations and calculates the electromagnetic torque using the coenergy method. This model provides preliminary information about the machine's characteristic, and can also be used as a tool to obtain initial design parameters. The results of the analytical model are then compared to finite element and experimental results. The comparison shows an acceptable agreement, which allows the model to be used as a design tool.