Faculty Publications
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Item Enhancing Torque performance with Dual Teeth Switched Reluctance Motor: A Novel Approach(Institute of Electrical and Electronics Engineers Inc., 2021) Kumawat, S.; Bhaktha, S.; Gangadharan, K.V.Among the available Electric traction motors, switched reluctance motor (SRM) because of its robustness, simple structure, and magnet-free construction is becoming a potential candidate for Electric vehicle (EV) traction application. However, they possess several drawbacks such as low torque density, high torque ripple, nonlinear characteristics, and complex control. In this paper, a novel design based on the conventional four-phase 8/6 SRM is proposed to enhance torque density. The stator pole of the 8/6 SRM is divided into two parallel split-poles (dual teeth) and correspondingly the number of rotor poles is increased to arrive at the novel 8/22 SRM configuration. A new formula for the design of stator-rotor poles of the novel SRM is introduced. Static analysis (FEA based) has been carried out to determine the torque output. In order to save computation time, a theoretical method based on Equivalent Magnetic Circuit (EMC) model is developed and its accuracy is verified with FEA results. The proposed design is also compared with its classical counterpart 8/6 SRM on the basis of torque output and torque per ampere ratio which are obtained from Static FEA simulation. The results indicated 8/22 SRM has a better torque performance and higher torque per ampere ratio in comparison to 8/6 SRM due to the increased variation of co-energy of the field with respect to rotor position at a constant current. This makes 8/22 SRM a promising candidate for high torque density applications in EVs and industrial applications. © 2021 IEEE.Item Design and Performance Analysis of a Switched Reluctance Motor Using Finite Element Analysis and Magnetic Equivalent Circuit Model(Defense Scientific Information and Documentation Centre, 2023) Bhaktha, S.B.; Kumawat, S.; Jeyaraj, J.; Gangadharan, K.V.By being magnet-free, and mechanically robust with a longer constant power range, switched reluctance motor (SRM) is gathering much attention as a potential choice to propel electric vehicles (EVs) and hybrid electric vehicles (HEVs). This paper comprehensively investigates the performance sensitivity to geometric design variables such as rotor diameter, pole arc angles, and yoke thicknesses for an SRM using static two-dimensional (2D) electromagnetic Finite-Element Analysis (FEA). The reason for the change in static characteristics due to variation in reluctance between SRM designs has not been detailed previously. This is addressed by the magnetic equivalent circuit (MEC) model that simplifies the design analysis. Results indicate that stator pole reluctance needs to be given due importance while studying the influence of rotor diameter. Also, it is imperative to set an adequate thickness of the stator and rotor yokes to minimize the effect of saturation on the performance. Rotor diameter and stator pole arc angle have a pronounced influence on the performance while the influence of rotor pole arc angle and yoke thicknesses was relatively less. © 2023, DESIDOC.Item Impact of copper doping on the electrochemical response of MnSe2 as anode for lithium-ion battery(Springer, 2024) Mukesh, P.; Lakshmi Sagar, G.; Brijesh, K.; Kumawat, S.; Hegde, A.; Kumar, A.; Nagaraja, H.S.Transition Metal Chalcogenides (TMC), due to their unique physicochemical properties, are studied in various fields and have potent applications in energy storage applications. This work is based on the synthesis and characterization of copper-doped manganese di-selenide and the effect of its doping on electrochemical performance as anode material for lithium-ion battery applications using the solvothermal method. The characterization techniques used are X-ray diffraction, Raman spectroscopy, field-emission scanning electron microscopy, XPS, UV–visible absorption spectroscopy, and electrochemical analysis. The XRD data confirms the formation of MnSe2 exhibiting Cubic crystal geometry. The FESEM images show the micro-cube-like structure with agglomerated nanocluster nanostructures on the surface with a dimension of 100–200 nm. The doping of the copper has decreased the band gap of the MnSe2, as studied by the UV–visible absorption spectrum. The electrochemical performance is analyzed as anode material for lithium-ion batteries. The charge/discharge measurements show a specific capacity of 706 mAh g−1 as the initial discharge capacity and 336 mAh g−1 as the initial charge capacity at 0.1 A g−1 current density. Meanwhile, 3% Copper-doped MnSe2 showed a better specific capacity of 878 mAh g−1 as the initial discharge capacity and 461 mAh g−1 as the initial charge capacity at 0.1 A g−1 current density. Cyclic stability, rate capability, and electrochemical impedance spectroscopy were performed, and it shows that 3% copper-doped MnSe2 has good stability and better conductivity and charge kinetics, indicating copper doping has enhanced the electrochemical performance of pristine MnSe2. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.