A Novel Dual Slot Permanent Magnet Machine with Complementary Rotors for Electric Vehicle Propulsion

Qingsong Wang, Martin Ordonez, Junnian Wang, Mohammad Ali Saket, Rouhollah Shafaei

Research output: Chapter in Book/Report/Conference proceedingConference proceedingpeer-review

1 Citation (Scopus)


This paper proposes a new dual slot permanent magnet (PM) machine with complementary rotors. The novelty lies in the use of complementary rotors, which are two salient pole rotors mechanically staggered by 180 electrical degrees. This design can reduce leakage flux and increase torque density. The stator is sandwiched between the two rotors and PM excitations are employed on both sides of the stator slots. All the PMs are circumferentially magnetized, and the magnetizing directions are the same for PMs in the same slot while opposite for PMs in adjacent slots. The two rotors are fixed at the end part, so they have the same rotating speed and the proposed machine only has one mechanical port. Concentrated windings are wound on the stator teeth, and the flux linked with each phase changes when the complementary rotors rotate, inducing electromotive force (EMF). The PMs on both sides of the slots can contribute to electromagnetic torque generation, so the proposed machine can be designed with larger torque. Meanwhile, since the flux paths of PMs and armature current are parallel, the PMs do not suffer from demagnetization risk. The electromagnetic performance of the proposed machine is investigated in detail using the finite element method.

Original languageEnglish
Title of host publicationProceedings - 2019 IEEE 28th International Symposium on Industrial Electronics, ISIE 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)9781728136660
Publication statusPublished - 1 Aug 2019
Externally publishedYes
Event28th IEEE International Symposium on Industrial Electronics - Vancouver, Canada
Duration: 12 Jun 201914 Jun 2019
Conference number: 28

Publication series

NameIEEE International Symposium on Industrial Electronics
ISSN (Electronic)2163-5145


Conference28th IEEE International Symposium on Industrial Electronics
Abbreviated titleISIE 2019


  • Complementary rotor
  • electromagnetic torque
  • finite element method
  • slot permanent magnet

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering


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