@article{chowdhury_tesfamicael_islam_husain_2021, title={Design Optimization of a Synchronous Reluctance Machine for High-Performance Applications}, volume={57}, ISSN={["1939-9367"]}, DOI={10.1109/TIA.2021.3091416}, abstractNote={The article presents a torque ripple minimization process using symmetrical rotor flux barrier shaping for synchronous reluctance (SyncRel) machines. High-performance applications demand stringent torque-speed, torque ripple, noise, and vibration requirements to satisfy the overall system performance. An iterative design approach incorporating electromagnetic, structural, and thermal analyses is presented that led to the design of a SyncRel motor with low torque ripple and minimized second-order vibration mode. The contributions demonstrated that the 30-slot, 4-pole SrncRel machine is a viable option for high-performance and packaging-constrained applications. Global response surface method that has the capability for parallel analysis has been used for the multiobjective optimization problem. A 2D finite element (FE) tool with the HyperStudy optimization routine has been used to implement the proposed design process. A quick and easy-to-use motor parameter-based model along with 2D FE analysis is used to evaluate the performance of the optimized design. Experimental results are provided to validate the iterative and comprehensive design, and design procedure.}, number={5}, journal={IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS}, author={Chowdhury, Mazharul and Tesfamicael, Abraham and Islam, Mohammad and Husain, Iqbal}, year={2021}, month={Sep}, pages={4720–4732} }
 @article{chowdhury_islam_husain_2021, title={Modeling of Electromagnetic Torque Including Ripple Harmonics in Synchronous Reluctance Machines}, volume={57}, ISSN={["1939-9367"]}, DOI={10.1109/TIA.2021.3107806}, abstractNote={In this article, an analytical model to predict the instantaneous torque profile in a synchronous reluctance (SyncRel) machine is developed, which can predict the machine's torque performance based on either inductance or flux-linkage harmonics. High-performance torque-ripple-sensitive applications have stringent torque ripple and noise and vibration requirements to satisfy the overall system requirements. The prediction of the torque ripple is critical in these applications to identify the root cause and then mitigate the torque ripple through design alternations under different loading (current) conditions of the machine. The developed analytical model provides a simpler, intuitive, and significantly less time consuming yet reasonably accurate alternative approach compared to multiple finite-element runs on the same baseline design. The developed analytical model provides design support through fast iterations with design variations or for motor electronic controller implementation. A 2-D finite-element model has been developed to validate the proposed analytical model. The analytical model is also validated with experimental data of a 30-slot four-pole SyncRel machine.}, number={6}, journal={IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS}, author={Chowdhury, Mazharul and Islam, Mohammad and Husain, Iqbal}, year={2021}, month={Nov}, pages={5851–5863} }
 @article{islam_chowdhury_shrestha_islam_husain_2021, title={Multiload Point Optimization of Interior Permanent Magnet Synchronous Machines for High-Performance Variable-Speed Drives}, volume={57}, ISSN={["1939-9367"]}, DOI={10.1109/TIA.2020.3040141}, abstractNote={Multiobjective and multiload point design optimization of an interior permanent magnet (IPM) synchronous machine using a global response surface method to achieve low torque ripple with high average torque over the entire speed range is presented in this article. The approach consisting of a set of design steps and multiobjective optimization to obtain high-performance electric machines with optimum usage of rare-earth materials for mass production is presented. The design optimization has been applied to a 12-slot eight-pole IPM machine with two different rotor structures to arrive at the optimized design for a variable-speed high-performance application. Motor parameters are extracted under different load conditions to predict the torque/speed performance of the motors. The proposed design approach provides a machine design with maximized output torque, improved torque density, lower torque ripple, and optimum usage of rare-earth materials. Finally, the finite-element-based modeling results are validated with the experimental results.}, number={1}, journal={IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS}, author={Islam, Md Sariful and Chowdhury, Mazharul and Shrestha, Amina and Islam, Mohammad and Husain, Iqbal}, year={2021}, month={Jan}, pages={427–436} }