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Grace Firsta Lukman(그레이스),Dong-Ho Son(손동호),Dong-Hee Lee(이동희),Jin-Woo Ahn(안진우) 대한전기학회 2017 전기학회논문지 Vol.66 No.12
This paper presents the design of in-wheel type Switched Reluctance Motor (SRM) which can be used as both traction motor and power pickup device in a wireless charging system of electric vehicles. The SRM acts as a traction drive in driving mode and a power receiver in charging mode to avoid any additional weights. Double stator axial field SRM is used due to its structure that can be mounted inside the wheel. The charging circuit is integrated with the asymmetric converter and phase windings of SRM, reducing the cost and size of the system. Magnetic resonance is implemented to increase the efficiency. Simulations done in Maxwell and Simplorer verify the effectiveness of the proposed system.
Radial Force Reduction Method of Switched Reluctance Motor with Partial Holes in the Rotor
Lukman Grace Firsta,Ahn Jin-Woo 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3
Switched reluctance motor (SRM) is remarkably simple in confi guration, having core laminations and windings only on its stator, which leads to various advantages such as high robustness. Radial force is known to be the origin of vibration, and it is severe in SRM due to its doubly salient structure. In this paper, a novel design of rotor which has partial inner holes to reduce radial force is proposed. For each rotor pole, a couple of holes along the axial direction is positioned as such to disturb the fl ux going straight from one stator pole to the one right across it. Simulations were performed to fi nd the optimum location for the holes and the motor was manufactured to verify the proposed idea. Experiments were done and the results of the rotor with and without holes were compared. The results show the eff ectiveness of the proposed structure.
Lukman Grace Firsta,Shahida Shahirin,Jeong Kwang-Il,Ahn Jin-Woo 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
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.