Design of a 24/16 Outer-Rotor Switched Reluctance Motor with Symmetrical/Asymmetrical Pole Shoes for Performance Improvement

• Published in: Journal of electrical engineering & technology Vol. 18; no. 2; pp. 961 - 970
• Main Authors: Lukman, Grace Firsta, Shahida, Shahirin, Jeong, Kwang-Il, Ahn, Jin-Woo
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01-03-2023; 대한전기학회
• Subjects: Electrical Engineering; Electrical Machines and Networks; Electronics and Microelectronics; Engineering; Instrumentation; Invited Paper; Power Electronics; 전기공학; T-shaped pole; L-shaped pole; Switched reluctance motor (SRM); Motor design; Torque ripple; Finite element analysis (FEA)
• ISSN: 1975-0102; 2093-7423
• DOI: 10.1007/s42835-022-01351-5

In this paper, the stator and rotor pole designs of a 3-phase 24/16 outer-rotor type switched reluctance motor (SRM) adopting symmetrical and asymmetrical pole shoes are proposed for performance improvement. The design process starts by optimizing the stator pole first and then the rotor. The slot area for windings is extremely limited in outer-rotor type SRM with high number of poles. The symmetric T-shape pole is proposed for the stator core to enlarge the winding space while maintaining the same torque profile. Asymmetric or the L-shape pole is proposed for the rotor to improve the torque characteristics such as reducing torque ripple and increasing the output torque at the beginning of the overlapping section. The effect of each design parameter is examined through finite element analysis. Simulation results show that the proposed SRM generates 39% lower torque ripple compared to that of a conventional one. Furthermore, experimental results confirmed that the proposed rotor model produces higher starting torque by 39% and slightly higher efficiency by 1.4% at the maximum operating speed of 1400 RPM.