A Novel Rotor Topology for High-Performance Fractional Slot Concentrated Winding Interior Permanent Magnet Machine

• Published in: IEEE transactions on energy conversion Vol. 36; no. 2; pp. 658 - 670
• Main Authors: Dutta, Rukmi, Pouramin, Alireza, Rahman, Muhammed F.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: concentrated winding; Density; Design optimization; electric machine; Electric vehicles; Fractional slot; interior permanent magnet machine; IPMSM; Minimum cost; Multiple objective analysis; Permanent magnets; PMSM; Power capacitors; Ripples; Rotors; Stators; Synchronous machines; Topology; Torque; Torque measurement; Windings
• DOI: 10.1109/TEC.2020.3030302
• ISSN: 0885-8969

This article presents a finite-element-based, multiobjective design optimization study of the fractional-slot, concentrated wound, permanent magnet synchronous machine (FSCW PMSM). Design objectives included maximization of efficiency, minimization of cost and low ripple without sacrificing torque density and wide constant power speed range. A large-scale optimization study revealed that while a V-type rotor provides high torque density, a spoke-type rotor has the benefit of low torque ripple. Quest for a design that can combine the goodness of both V- and spoke type rotors for an FSCW stator has led to a novel interior permanent magnet rotor topology referred here as Y-type. The goals of achieving maximum efficiency, minimum cost and wide CPSR were also accomplished in the proposed Y-type FSCW IPMSM. For experimental verification purpose, three fully optimized rotors - V-, spoke- and Y-type were constructed for a 12-slot/10-pole FSCW stator. Extensive experimental tests were conducted on three machines for a detailed comparison study. It will be shown that the proposed Y-type FSCW IPMSM outperforms both V and spoke-type configurations. A scaled-up version of the Y-type FSCW IPMSM shown to have satisfied many of the Freeedomcar 2020 targets, which is promising for application in electric vehicles.