Abstract
In this paper, the influence of stator/rotor pole combinations on electromagnetic performance in partitioned stator (PS) doubly salient (DS) permanent magnet (PM) (DSPM) (PS-DSPM) machines is investigated, in terms of open-circuit flux-linkage, back-EMF, cogging torque, on-load torque characteristics. Analytical deduction shows that by modifying the all poles wound winding to alternate poles wound winding in the 12/11- and 12/13 stator/rotor pole PS-DSPM machines, the fundamental distribution factor and hence the fundamental winding factor can be enhanced, resulting higher torque density. Consequently, among the 12-stator-pole all and alternate poles wound PS-DSPM machines, the 10- and 11-rotor-pole machines exhibit the highest torque density, respectively. However, the 12/10- and 12/14-pole alternate poles wound PS-DSPM machines suffer from higher phase back-EMF even harmonics, resulting larger torque ripple. The 12/10- and 12/11-pole all and alternate poles wound prototypes are built and tested to verify the FE analysis.
Highlights
Stator-permanent magnet (PM) machines have drawn wide attention in the last decades, due to the robust and simple rotor as well as better thermal dissipation capability than the rotor-PM machines [1]-[3]
Different from rotor-PM machines in which PMs are placed in the rotor [4]-[7], in stator-PM machines both armature windings and PMs are accommodated in the stator, leaving the roSyntax Error: Embedded font file may be invalid
As Ns is always an even number for pPM-pole-pair PMs, Nr will be an odd number if the combination of Ns and Nr is selected based on (4) and the rotor will suffer from the unbalanced magnetic force (UMF)
Summary
Stator-permanent magnet (PM) (stator-PM) machines have drawn wide attention in the last decades, due to the robust and simple rotor as well as better thermal dissipation capability than the rotor-PM machines [1]-[3]. Different from rotor-PM machines in which PMs are placed in the rotor [4]-[7], in stator-PM machines both armature windings and PMs are accommodated in the stator, leaving the roSyntax Error: Embedded font file may be invalid. The conventional DSPM-I machine analyzed in [8]-[14] suffers from unbalanced magnetic circuit for three-phase armature windings and larger torque ripple, which can be relieved in the recently proposed DSPM-II machine [15]. In the DSPM-II machine, PM pole number is equal to the stator pole number This new type DSPM-II machine itself has even 5.97% smaller torque density than the conventional DSPM-I machine, .
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