Modeling of Electromagnetic Torque Including Ripple Harmonics in Synchronous Reluctance Machines.

In this article, an analytical model to predict the instantaneous torque profile in a synchronous reluctance (SyncRel) machine is developed, which can predict the machine's torque performance based on either inductance or flux-linkage harmonics. High-performance torque-ripple-sensitive applications have stringent torque ripple and noise and vibration requirements to satisfy the overall system requirements. The prediction of the torque ripple is critical in these applications to identify the root cause and then mitigate the torque ripple through design alternations under different loading (current) conditions of the machine. The developed analytical model provides a simpler, intuitive, and significantly less time consuming yet reasonably accurate alternative approach compared to multiple finite-element runs on the same baseline design. The developed analytical model provides design support through fast iterations with design variations or for motor electronic controller implementation. A 2-D finite-element model has been developed to validate the proposed analytical model. The analytical model is also validated with experimental data of a 30-slot four-pole SyncRel machine. [ABSTRACT FROM AUTHOR]