Novel Switched Reluctance Machine Configuration With Higher Number of Rotor Poles Than Stator Poles: Concept to implementation

Piyush C. Desai, Mahesh Krishnamurthy, Nigel Schofield, Ali Emadi

Research output: Contribution to journalConference articlepeer-review

233 Citations (Scopus)


There is a great demand for efficient, quiet, reliable, and cost-effective motor drives for propulsion systems in hybrid and plug-in hybrid electric vehicles. Owing to a rigid structure and the absence of magnetic source on the rotor, a switched reluctance machine (SRM) is inherently robust and cost effective. In spite of these advantages, several challenges in the control of this machine remain an issue, including high levels of torque ripple, acoustic noise, and a relatively low torque density. This paper presents a new family of SRMs which have higher number of rotor poles than stator poles. Using a newly defined pole design formula, several novel combinations of the statorrotor poles have been proposed. From the simulation and experimental analysis of a prototype 6/10 configuration, it has been observed that this machine produces higher torque per unit volume and comparable torque ripple when compared to a conventional 6/4 SRM with similar number of phases and constraints in volume. The results presented in this paper make this family of machines a strong contender for survivable high-performance applications for automotive propulsion systems. The simulation and experimental results for the prototype 6/10 configuration have been presented and compared to a conventional 6/4 design for verification.

Original languageEnglish
Article number5290140
Pages (from-to)649-659
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number2
Early online date20 Oct 2009
Publication statusPublished - 1 Feb 2010
Externally publishedYes
Event13th International Power Electronics and Motion Control Conference - Poznan, Poland
Duration: 1 Sep 20083 Sep 2008
Conference number: 13


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