Multi-objective optimization of a spoke-type permanent magnet motor with fractional-slot concentrated windings for EVs

Abstract

Purpose This paper aims to propose a spoke-type fractional-slot concentrated windings (FSCW) PM machine for EVs driving system to improve torque density. To further improve electromagnetic performance, the multi-objective optimization design is processed based on response surface (RS) model and simulated annealing cuckoo search (SA-CS) algorithm. Design/methodology/approach The spoke-type FSCW PM machine is designed and optimized to meet the requirement of EVs driving system. First, a spoke-type FSCW PM machine is designed and some of key parameters are obtained based on equivalent magnetic circuit (EMC) method. Then, the RS model and modified SA-CS algorithm are proposed to obtain higher torque, lower torque ripple and higher efficiency. Findings After verification by finite element method for no-load and load performance, the optimal machine has higher torque density, lower torque ripple and higher efficiency compared with initial machine. Finally, a 20 kW prototype is manufactured and tested to verify the validity of the proposed optimization design method. Originality/value This paper designs a high torque density spoke-type FSCW PM machine, which is superior for EVs driving system. Meanwhile, a novel modified SA-CS algorithm is applied to the field of electrical machine multi-objective optimal design.

Investigation of Six-Phase Surface Permanent Magnet Machine With Typical Slot/Pole Combinations for Integrated Onboard Chargers Through Methodical Design Optimization

“…These sub and super space harmonics yield rotor core losses, rotor heating, and noise and vibrations in the mechanical structure [45]. Several work has been conducted in the literature to mitigate the above-mentioned drawbacks based on three-phase [46,47] and multi-phase configurations [45,48]. However, the employment of multi-phase machines entails a more complex converter and controller.…”

“…However, the employment of multi-phase machines entails a more complex converter and controller. The multi-objective optimization of FCSW-based PM machine has been recently elaborated to improve the torque density [46]. Moreover, several electromagnetic vibration sources have been investigated aiming at the design of PM machine with FSCW to decrease the electromagnetic vibration [47].…”