Abstract
This paper presents a novel design concept for Synchronous Reluctance (SynRel) machines aimed at reducing the torque ripple. Two general sizing approaches based on the homothetic scaling principle are defined and compared. An in depth analysis on the torque ripple, for a wide range of scaled geometries, evaluated by finite element, has been carried out at different operating conditions. A further analysis is performed on 4 scaled geometries that have been optimized starting from 4 random rotor geometries. It is shown that the main rotor geometrical variables converge to similar values for all scaled machines. The accuracy of the proposed model is then validated by comparing the FE simulated torque ripple waveforms with the experimental data carried out, for a range of operating conditions, on a machine prototype. The outcome of this work is a fast and accurate scaling technique for the preliminary design of SynRel machines with reduced torque ripple.
Highlights
Synchronous reluctance (SynRel) machines and their associated permanent magnet assisted variants are rapidly gaining market shares over the traditional electrical machine topologies in a wide range of applications
This paper assesses the effect on the torque ripple of two homothetic scaling principles of synchronous reluctance machines
The correlations between the torque ripple of a reference machine with respect to a scaled machine is analysed in depth
Summary
Synchronous reluctance (SynRel) machines and their associated permanent magnet assisted variants are rapidly gaining market shares over the traditional electrical machine topologies in a wide range of applications This increased interest results from the reduced use of rare earth materials, improved efficiency and field weakening capability. The proposed design guidelines originate from considerations based on analytical models, which often rely on a set of hypotheses introduced to simplify the analysis, and to make it feasible Such analytical models most of the time neglect the effect of the non-linearities and geometrical complexities on the predicted performance. They are useful only during the preliminary design stage. It is a general conclusion that adopting a flux barrier profile described by the Joukowski equation and a flux barrier parametrization
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