Synchronous Reluctance Machine Torque Performance Optimization With Different Steel Sheet Material Based On Rotor Flux Barriers Geometry

In recent years a considerable attention has drawn to synchronous machines (SyncM) by researchers due to their high capabilities such as high torque density and efficiency. Also various types of SyncMs including Synchronous reluctance machine (SyncRM) have appeared as permanent magnet SyncM (PM-SyncM), enhancing electromagnetic characteristics (torque density, efficiency and power factor) of a conventional SyncM. Synchronous Reluctance Machine made up a bulk of the recent investigations. As other configurations, SyncRM could be investigated as permanent magnet assisted SyncRM (PMASyncRM) [1-5], [7-10], [12], [16], [20]. SyncRMs provide viable features which allows investigators and manufacturers to achieve higher electromagnetic capabilities and enhance a conventional SyncRM by providing wide range of precise research fields. The stator of SyncM, Induction Machine (IM) and SyncRM are the same, however IM and SyncRM are different in rotor structure. In comparison with IM, although the total iron loss of rotor in SyncRM is less than IM, however, due to lower power factor, the copper loss of stator windings in SyncRM is more than IM. SyncRM obtained higher torque density and efficiency than IM and has lower rotorinertia and manufacturing, operation and maintenance cost and higher reliability. Also due to the absence of rotor cage and low inertia, the ratio of torque to inertia is high in SyncRM which makes this machines suitable to operate as servo, while this ratio is lower than its amount for PM or switched reluctance machines in low speed applications. In addition to this, power factor of SyncRM in full-load is less than IM but for lower loads this difference decreases and even for some loads, SyncRM indicates higher power factors.