Five-Phase Synchronous Reluctance Machines Equipped with a Novel Type of Fractional Slot Winding

Abstract

Multi-phase machines are so attractive for electrical machine designers because of their valuable advantages such as high reliability and fault tolerant ability. Meanwhile, fractional slot concentrated windings (FSCW) are well known because of short end winding length, simple structure, field weakening sufficiency, fault tolerant capability and higher slot fill factor. The five-phase machines equipped with FSCW, are very good candidates for the purpose of designing motors for high reliable applications, like electric cars, major transporting buses, high speed trains and massive trucks. But, in comparison to the general distributed windings, the FSCWs contain high magnetomotive force (MMF) space harmonic contents, which cause unwanted effects on the machine ability, such as localized iron saturation and core losses. This manuscript introduces several new five-phase fractional slot winding layouts, by the means of slot shifting concept in order to design the new types of synchronous reluctance motors (SynRels). In order to examine the proposed winding's performances, three sample machines are designed as case studies, and analytical study and finite element analysis (FEA) is used for validation.

Keywords

• finite element analysis
• five-phase machine
• fractional slot concentrated winding (fscw)
• machine slot/pole combination
• mmf harmonics
• synchronous reluctance machine
• winding factor