Efficiency-optimized control of variable speed reluctance machines

Synchronous reluctance machines (SynRM) characterize a sinusoidal magnetic air gap field. They are deployed in a variety of applications and operated by a frequency inverter. When implementing an optimized control method, its efficiency meets the requirements of the IE4 class and higher. Therefore, the SynRM are alternatives to induction machines due to its robust structure and its low costs when employed as variable speed drive in powertrains. The paper compares two different efficiency-optimized methods for the field-oriented control of a SynRM.