Faculty Publications

Now showing 1 - 3 of 3

Driving Cycle-Based Design Optimization and Experimental Verification of a Switched Reluctance Motor for an E-Rickshaw
(Institute of Electrical and Electronics Engineers Inc., 2024) Bhaktha, B.S.; Jose, N.; Vamshik, M.; Pitchaimani, J.; Gangadharan, K.V.
This article deals with the design and optimization of a 2 kW switched reluctance motor (SRM) for an electric rickshaw (E-rickshaw). Previously published research on SRM optimization has mostly focused on the optimization of their design and control variables only at the rated conditions. In electric vehicle (EV) applications, the load operating points (LOPs) of a traction motor are dynamic and spread widely across the torque speed envelope. To enhance their overall performance, it is vital to include them in the design optimization process; therefore, in this article, a novel procedure for implementing the multiobjective design optimization (MODO) of an SRM based on a driving cycle has been demonstrated. Higher starting torque and torque density with reduced electromagnetic losses throughout the driving cycle are established as the design objectives, subject to practical restrictions on current density and slot fill factor. The design objectives have been accurately evaluated through transient finite element analysis (FEA) and a computationally efficient SRM drive model (developed in MATLAB/Simulink) with consideration of the excitation control parameters. Kriging models have been constructed to reduce the computation cost of FEA during the optimization process. Then, a nondominated sorting genetic algorithm II (NSGA II) based multiobjective optimization coupled with the constructed Kriging models is conducted to generate a Pareto front. An optimal design that offers the best balance between the design objectives is selected from the Pareto-optimal set, and the dimensions of corresponding design variables are used to build a prototype. Finally, the static and dynamic performance of the SRM prototype are experimentally evaluated and validated with the FEA simulations. © 2024 IEEE.
Driving cycle-centric design optimization and experimental validation of high torque density outer rotor 8/18 MTSRM for an E-Bike
(Elsevier Ltd, 2025) B, S.B.; Sarma, S.; Vamshik, M.; Pitchaimani, J.; Bhaktha, K.V.
This paper presents an innovative methodology for optimizing the design parameters of a 500 W low-speed outer rotor switched reluctance motor (OR-SRM) for an electric bicycle (E-bike) in accordance with a driving cycle. Design optimization of SRMs based on driving cycles has been minimally explored in the literature, with all existing research focusing exclusively on high-speed electric vehicle (EV) applications. These studies utilized computationally intensive dynamic current analysis methods to account for the significant dynamic effects incurred. Given the E-bike's low-speed characteristics, the present study mitigates the computational load of design optimization through static current analysis. A high torque density 8/18 OR-multi-teeth (MT) SRM topology has been proposed. The benefits of this topology, such as mass, cost, torque ripple reductions, and improved torque density, have been highlighted through a comparison with a conventional 6/10 OR-SRM topology. The reliability of the finite element analysis models used in this study is validated through experiments conducted on an 8/18 OR-MTSRM prototype. The multi-objective design optimization aims to maximize starting torque and minimize torque ripple and electromagnetic losses throughout the driving cycle. The efficacy of the optimization is confirmed by the enhancement in the performance parameters of the optimal design compared to the preliminary design. © 2025 Elsevier Ltd
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.

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