Research on Design Method and Electromagnetic Vibration of Six-Phase Fractional-Slot Concentrated-Winding PM Motor Suitable for Ship Propulsion

Abstract

In the background of high-power propulsion application on ships and existing uncertain electromagnetic and vibration features of multiphase fractional-slot concentrated-winding permanent magnet (PM) motor, the electromagnetic design and analysis methods of six-phase fractional-slot concentrated-winding PM motor are presented. Four different pole and slot combination schemes are sifted out, and air-gap magnetic field and electromagnetic force of these four motors are studied in contrast. On the basis of the above, a 20-kW prototype of six-phase fractional-slot concentrated-winding PM motor with 48 slots and 44 poles is designed and manufactured, and its electromagnetic and vibration performances are tested through experiments. The test results are in good agreement with calculations, which could guide the development of high-power ship propulsion.INDEX TERMS Fractional-slot, concentrated-winding, modal analysis, electromagnetic vibration, six-phase PM motor.

Research on weakening measure of radial electromagnetic force waves in permanent magnet synchronous motors by inserting auxiliary slots

“…In [7],the radial electromagnetic forces and the vibration characteristics excited by them of five PMSMs are analysed. Obviously, considering the influence of core saturation and complex slot structure, the air‐gap flux density and the electromagnetic force waves can be calculated accurately by the FEM [8, 9]. However, it is difficult to obtain the corresponding relationship between the components of the magnetomotive force (MMF) and air‐gap permeance and electromagnetic force waves of various orders, which is not conducive to their weakening.…”

Analysis and design of 18‐slot/10‐pole six‐phase fault‐tolerant permanent magnet synchronous motor for electric vehicles

“…This kind of motor has both the fault‐tolerant performance of switched reluctance motor and the advantages of high power density and high efficiency of PM synchronous motor (PMSM). After producing, it was applied to ship propulsion, aerospace and other applications requiring high reliability [1–6]. With many countries giving increasing attention to new energy‐saving and environmental protecting electric vehicles (EVs), safer and more comfortable EVs have become prominent research in the past ten years.…”

Investigation Study of the Influence of Pole Numbers on Torque Density and Flux-Weakening Ability of Fractional Slot Concentrated Winding Wheel-Hub Machines

“…Many researches investigate the influence of pole/slot combinations on performances of FSCWM, including torque density [6], fault-tolerant ability [7], [8], cogging torque [9], rotor eddy current loss [10], unbalanced magnetic pull and torque ripple [11], [12]. These researches focus mainly on basic pole/slot combinations, e.g., 6/9 (6-pole 9-slot FSCWM with tooth coil winding, hereinafter), 8/9, 8/12, 10/9, 10/12, 14/12 and 14/15.…”