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Description
Permanent magnet synchronous machines (PMSM) with fractional-slot concentrated winding (FSCW) configuration are featured with short end windings, low mutual coupling between phase windings, high self-inductance, high slot fill-factor, reduced losses and easy and cheap manufacturing process, which makes them best choices for many applications. Based on these merits, a novel type of FSCW topology is presented. This paper investigate the method to form this topology with method of slot vector star map and slot number phase diagram, and try to find the combination of slots and poles which is available to this topology. Recent study has found that the feasible combinations of slots and poles are an even multiple of number of slots and poles of the unit machine that can use FSCW originally. And when the new topology is applied, the number of the unit machine will be halved. It means FSCW stator with even number of unit machine can apply either the original FSCW or the new topology of FSCW. In this research, a 20-pole, 24-slot PMSM is chosen to analyse the characteristics of this topology of FSCW. Conductor phasor superposition method is adopted to analysis the MMF harmonics since FSCW leads to high harmonic content, and 2D finite element analysis (FEA) is adopted to deal with the machine performances like torque ripple, harmonic losses especially permanent magnets eddy current loss and radial electromagnetic force. All the results are dealt and compared with the original FSCW under the same situation. Research has found PMSM with the new topology of FSCW configuration has lower torque ripple and lower noise under the same electric and magnetic load. Other features are currently under study.
