Novel Design of Six-Phase Spoke-Type Ferrite Permanent Magnet Motor for Electric Truck Application

Hoyun Won, Yang-Ki Hong, Minyeong Choi, Jonathan Platt, Briana Bryant, Seungdeog Choi, Shuhui Li, Hwan-Sik Yoon, Timothy A. Haskew, Jongkook Lee, Taegyu Lee and Tae-Won Lim
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Hoyun Won: Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
Yang-Ki Hong: Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
Minyeong Choi: Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
Jonathan Platt: Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
Briana Bryant: Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
Seungdeog Choi: Department of Electrical Engineering, Mississippi State University, Starkville, MS 35762, USA
Shuhui Li: Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
Hwan-Sik Yoon: Department of Mechanical Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
Timothy A. Haskew: Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
Jongkook Lee: Institute of Fundamental and Advanced Technology (IFAT), Hyundai Motor Company, Uiwang-si 16082, Korea
Taegyu Lee: Institute of Fundamental and Advanced Technology (IFAT), Hyundai Motor Company, Uiwang-si 16082, Korea
Tae-Won Lim: Institute of Fundamental and Advanced Technology (IFAT), Hyundai Motor Company, Uiwang-si 16082, Korea

Energies, 2022, vol. 15, issue 6, 1-21

Abstract: This paper proposes a 300 kW 24-slot/10-pole 6-phase stator-shifted fractional-slot concentrated winding spoke-type ferrite permanent magnet machine for electric truck applications. The proposed motor consists of a stator with dual three-phase windings positioned 75 degrees apart to reduce higher-order MMF harmonic order, and a rotor with an inexpensive and high-resistance ferrite permanent magnet in the spoke configuration. The simulated result of the stator-shifted machine is compared with a fabricated stator-shifted machine, and the results show good agreement with each other. To further reduce the torque ripple from 2.5 to 0.9% while maintaining a high maximum torque of 2980 Nm, circular voids with a diameter of 11 mm are embedded in the rotor. The proposed motor is evaluated for irreversible demagnetization, mechanical and thermal stability, and fault tolerant ability. To assess the proposed motor performance, the electric truck simulation model is constructed using MATLAB/Simulink and used to compare with the reported 12-slot/10-pole rare-earth permanent magnet-based machine. Compared to a previously reported six-phase rare-earth permanent magnet based flat-type machine, the proposed motor can save 4.3 kWh of energy with a USD 2512 lower cost while retaining a similar motor performance.

Keywords: phase-shift; rare-earth free permanent magnet; six-phase winding; spoke-type motor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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