Abstract
In this paper, the stator/rotor pole combinations in variable flux reluctance machines (VFRMs) are investigated from the prospect of magnetic gearing effect. Firstly, the magnetic gearing effect in the torque production of VFRMs is revealed from an analytical model. Based on this, the principles of feasible stator/rotor pole selection and corresponding winding configuration are analyzed. Then, the influence of stator/rotor pole combination on average torque and torque ripple production is investigated. It is found that the synchronous torque is proportional to the 1st rotor radial permeance component and has the dominant contribution in average torque production. Meanwhile, the 6-stator-slot/(6i±2)-rotor-pole (6s/(6i±2)r) and their multiples are large torque ripple origins for VFRMs due to their significant large ripple in reluctance torque component. Moreover, a lower stator slot number is preferable choice to obtain higher torque/copper loss ratio under low current density while a higher stator slot number is more suitable for high current density and large frame scale design. Finally, the analyses and conclusions are verified by finite element analysis (FEA) on the 6 and 12-stator-slot VFRMs and by experimental tests on a 6s/7r VFRM.
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