Abstract
The rotor of transversally laminated synchronous reluctance motor is constructed with multi-flux barriers by stamping the laminated steel sheets and the machine is short for TLR-SynRM. It has obvious advantages of smooth rotor surface, and the lower copper loss, et al. [1]. Nevertheless, TLR-SynRM has the drawback of high torque ripple, and one of the main reasons is the non-sinusoidal distribution of the air-gap flux density caused by the spatial harmonics of stator magnetic potential and flux-barrier rotor configuration. In [2], it has been carried out the genetic algorithm (GA) optimizations to improve the angles of the flux-barrier ends to reduce the torque ripple. In this paper, it proposes the step-shaped gradient flux barriers in TLR-SynRM for torque ripple reduction.A method is presented to compute the reluctances of each layer of flux barriers through conformal mapping method. Based on this calculation, it is shown how the air-gap flux density distribution of TLR-SynRM can be analytically computed through magnetic equivalent circuit (MEC) method. Combining with the two methods, the flux-barrier parameters for torque ripple reduction can be improved and the final improved flux-barrier parameters are obtained.
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