Browsing by Author "Ramnihor, G.R."

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    Comparative assessment of a novel 8/18 multi-teeth with conventional 8/10 in-wheel SRM for an E-Scooter
    (Taylor and Francis Ltd., 2024) Bhaktha, S.; Ramnihor, G.R.; Sahu, M.; Jogi, A.; Pitchaimani, J.; Gangadharan, K.V.
    Electric scooters are increasingly gaining popularity in India owing to rising global crude oil prices and rising levels of vehicular pollution. Most of them are currently powered by expensive in-wheel (IW) permanent magnet (PM) brushless DC motors. Owing to their simplicity, and ruggedness while being cost-effective (since they do not employ PMs), switched reluctance motors (SRMs) are a viable alternative. Despite these benefits, SRMs possess drawbacks such as low torque density and inferior efficiency. Recently, a multi-teeth (MT) SRM with an improved performance was reported. However, the design of MTSRM topologies and their electromagnetic performance have not been explored sufficiently. In this paper, a design formula governing the selection of the number of MT and rotor poles for MTSRMs has been proposed. Using this, a novel four-phase 8/18 IW-MTSRM is derived and proposed for an E-scooter. The characteristics of the proposed SRM are numerically compared with a conventional 8/10 SRM based on magnetic characteristics, efficiencies and steady-state operation for the complete torque-speed range. Results indicate that the proposed 8/18 MTSRM has a higher peak torque capacity, torque density, superior drive cycle efficiency and reduced torque ripple. Further, the FEA model is validated experimentally on a downsized 8/18 MTSRM prototype. © 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
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    Influence of Stator Structure on the Electromagnetic Performance of an In-Wheel Multi-teeth SRM
    (Springer, 2025) Bhaktha, S.; Ramnihor, G.R.; Pitchaimani, J.; Gangadharan, K.V.
    Compared to traditional switched reluctance motor (SRM) topologies, the multi-teeth (MT) SRM topology has been reported to be beneficial for in-wheel motor applications because of its superior torque density, efficiency, with minimized torque ripple. In this paper, a four-phase 8/18 IW-MTSRM with two different stator structures, namely the trapezoidal-shaped stator structure (TSSS) and the Y-shaped stator structure (YSSS) are designed and analyzed. Using two-dimensional (2D) electromagnetic static finite element analysis, the performance metrics including average torque, peak torque capacity, and torque ripple are compared under the condition of constant copper loss. Based on the results obtained, this study attempts to offer guidance and suggestions for choosing an appropriate stator structure among IW-MTSRMs according to the application requirement. To validate the FEA model employed in this study, an 8/18 IW-MTSRM with the TSSS is prototyped and tested experimentally. The experimental results are observed to agree with the FEA model. © The Institution of Engineers (India) 2024.