Calculation of Winding Factor and Analysis of Armature MMF of a PMSM with Fractional-Slot and 5-Phase Winding

The use of fractional slot concentrated windings in electrical machines has a variety of advantages. A winding factor is one of the most important parameter which is necessary for electrical machines designing and modeling.

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A Design Method of Fractional-Slot Concentrated Winding SPMSM Using Winding factor and Inductance factor

IEEJ Transactions on Industry Applications ◽

10.1541/ieejias.127.1171 ◽

2007 ◽

Vol 127 (11) ◽

pp. 1171-1179 ◽

Cited By ~ 10

Author(s):

Kan Akatsu ◽

Shinji Wakui

Keyword(s):

Design Method ◽

Fractional Slot Concentrated Winding ◽

Winding Factor ◽

Fractional Slot

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Multi-Phase Fractional-Slot PM Synchronous Machines with Enhanced Open-Circuit Fault-Tolerance: Viable Candidates for Automotive Applications

World Electric Vehicle Journal ◽

10.3390/wevj12010032 ◽

2021 ◽

Vol 12 (1) ◽

pp. 32

Author(s):

Elyes Haouas ◽

Imen Abdennadher ◽

Ahmed Masmoudi

Keyword(s):

Fault Tolerance ◽

Open Circuit ◽

Synchronous Machines ◽

Analytical Prediction ◽

Element Analysis ◽

Multi Phase ◽

Winding Factor ◽

Fractional Slot

This paper deals with the winding arrangement of multi-phase fractional-slot permanent magnet (PM) synchronous machines (FSPMSMs), with emphasis on the enhancement of their open-circuit fault-tolerance capability. FSPMSMs are reputed by their attractive intrinsic fault-tolerance capability, which increases with the number of phases. Of particular interest is the open-circuit fault-tolerance capability, which could be significantly enhanced through the parallel connection of the coils or suitable combinations of the coils of each phase. Nevertheless, such an arrangement of the armature winding is applicable to a limited set of slot-pole combinations. The present work proposes a design approach that extends the slot-pole combinations to candidates that are characterized by a star of slots including three phasors per phase and per winding period. It has the merit of improving the tolerance against open-circuit faults along with an increase in the winding factor of multi-phase machines. Special attention is paid to characterization of the coil asymmetry required for the phase parallel arrangement. A case study, aimed at a finite element analysis (FEA)-based investigation of the open-circuit fault-tolerance of a five-phase FSPMSM, is treated in order to validate the analytical prediction.

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Influence of unbalanced magnetic force on shaft deflection in permanent magnet synchronous motor with fractional slot concentrated windings

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209466 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 1461-1468

Author(s):

Ting Dong ◽

Juyan Huang ◽

Bing Peng ◽

Ling Jian

Keyword(s):

Permanent Magnet ◽

Magnetic Force ◽

Permanent Magnet Synchronous Motor ◽

Operational Reliability ◽

Topology Structure ◽

Permanent Magnet Synchronous Motors ◽

Synchronous Motors ◽

Shaft Deflection ◽

Large Length ◽

Fractional Slot

The calculation accuracy of unbalanced magnetic forces (UMF) is very important to the design of rotor length, because it will effect the shaft deflection. But in some permanent magnet synchronous motors (PMSMs) with fractional slot concentrated windings (FSCW), the UMF caused by asymmetrical stator topology structure is not considered in the existing deflection calculation, which is very fatal for the operational reliability, especially for the PMSMs with the large length-diameter ratio, such as submersible PMSMs. Therefore, the part of UMF in the asymmetrical stator topology structure PMSMs caused by the choice of pole-slot combinations is analysized in this paper, and a more accurate rotor deflection calculation method is also proposed.

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