Faculty Publications
Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736
Publications by NITK Faculty
Browse
7 results
Search Results
Item Modeling and Analysis of Average Torque Control Strategy on Switched Reluctance Motor for E-mobility(Institute of Electrical and Electronics Engineers Inc., 2021) Pillai, A.; Anuradha, S.; Gangadharan, K.V.; Umesht, P.; Bhaktha, S.This paper investigates the Average Torque Control (ATC) approach for an electric scooter application using a 250W, Outer-rotor type, 8/6 Switched Reluctance Motor (SRM). It also employs a search algorithm based on a multi-objective function to determine optimum excitation angles to increase SRM drive performance. The MATLAB/Simulink environment is used to model and analyze the SRM drive control system. The simulation results demonstrate the drive system's smooth efficiency with reduced torque ripple over a speed range due to the optimum turn-on and turn-off angle selection. The ATC technique is selected as an ideal alternative for the SRM drive control system against other control strategies due to the wide-speed range application in an electric scooter. © 2021 IEEE.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 Implementation of PWM Speed control for SRM drive using TMS320F28069 Microcontroller(Institute of Electrical and Electronics Engineers Inc., 2023) Manaswi, K.; Jose, N.; Bhaktha, S.; Balasubramanian, B.; Gangadharan, K.V.Switched reluctance motors (SRMs) are a promising alternative to conventional motors in various variable speed applications due to their simple design, low production costs, high starting torque, wide speed range, high reliability, and efficiency. However, they suffer from high torque ripple and system noise, which can be minimized by selecting appropriate control methods and converter topologies. Due to the intricate nature of the control, motor drives may employ digital systems by utilizing high-speed digital signal processors (DSPs) or microcontrollers (MCUs) to achieve superior results which offers the flexibility to implement complex control algorithms with high precision and accuracy. Therefore, this study proposes the implementation of a Voltage PWM control strategy for a Switched Reluctance Motor (SRM) on a compact high-speed microcontroller (TMS320F28069) using Code Composer Studio. This study demonstrates how MCUs can aid in the precise control of SRMs. © 2023 IEEE.Item Methodology for Modelling a Custom SRM Configuration Using MATLAB/Simulink(Institute of Electrical and Electronics Engineers Inc., 2024) Jose, N.; Jayaraman, A.; Bhaktha, S.; Sarma, S.; Balasubramanian, B.; Gangadharan, K.V.Switched Reluctance Motors (SRMs) have gained significant attention in recent years due to their simplicity, robustness, and energy efficiency, making them suitable for various applications such as electric vehicles. However, the development of custom configurations for SRMs presents challenges due to limited options in existing simulation platforms like MATLAB/Simulink. This paper presents a comprehensive methodology for modelling and simulating a custom SRM configuration, specifically a 4-phase, 8/18 Multi-Teeth (MT) SRM, using MATLAB/Simulink. The methodology involves estimating Look-Up Tables (LUTs) using electromagnetic static Finite Element Analysis (FEA), developing mathematical models for phase current and torque, and integrating them into a Simulink model. After that, a closed loop speed control simulation using Hysteresis Current Control (HCC) and Anti-windup PID is applied to the created model. The simulation results demonstrate the effectiveness of the proposed methodology in accurately predicting the motor's performance. Additionally, a comparison with FEA results highlights the model's ability to closely replicate real-world behaviour, despite minor discrepancies attributed to differences in handling mutual phase coupling effects. © 2024 IEEE.Item 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.Item Vibration reduction and intelligent control in SRM using optimised two stage commutation(Inderscience Publishers, 2025) Wilson, V.; Latha, P.G.; Jose, N.; Bhaktha, S.Switched reluctance motors (SRMs) have grown in popularity in a variety of industrial applications due to their inherent benefits such as high fault-tolerance, simplicity, affordability, and rare-earth free nature. However, the generation of undesirable vibrations due to radial force variations remains a significant challenge. Two stage commutation based on active vibration cancellation (AVC) is an effective method to reduce these vibrations. The focus of this paper is to address the major limitation with two stage commutation, namely the extended tail current causing increased copper loss. This is accomplished with optimal commutation parameters employing particle swarm optimisation (PSO) method. A MATLAB/Simulink model of SRM with vibration signal is developed and is used for demonstrating vibration cancellation. An intelligent control is also implemented which can track the dynamic changes in speed-load conditions. This paper showcases that this approach is an effective solution to reduce the vibrations issues in SRM, thereby improving the overall performance of the motor for industrial applications. © © 2025 Inderscience Enterprises Ltd.Item 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.