Abstract
A proper design of the rotor geometry is imperative to achieve optimal performance in synchronous reluctance machines. In particular, high average torque and low torque ripple are desirable features. In literature it has been demonstrated that the rotor flux-barrier shape and ends have a strong impact on the torque ripple. This paper deals with a multi flux-barrier reluctance machine, in particular on the design of the rotor flux-barrier geometry. The focus is on the design of an asymmetric rotor, which is characterized by flux-barriers in adjacent poles with different geometry. The purpose is to compensate the torque harmonics caused between poles. The design of such a configuration is based on an analytical model so as to achieve general design rules, allowing an easy implementation for other motor sizes. Rotors with one and two flux-barriers per rotor pole are taken into account. However, the advantageous analytical model can be extended to any number of flux-barriers per pole. A practical approach is preferred. Thanks to proper assumptions, the analytical model is simplified highlighting the main causes of torque ripple. Some examples referring to 4-pole synchronous reluctance machines are investigated and illustrated. The results are compared with a full-featured analytical model. Experimental measurements confirm the predictions.
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