@article{latif_agoro_jaffar_husain_2023, title={Control of a 4-Pole/2-Pole Electronic Pole-Changing Induction Motor for Traction Applications}, volume={59}, ISSN={["1939-9367"]}, DOI={10.1109/TIA.2023.3307090}, abstractNote={Pole-changing motors can be very useful for traction applications which require high torque at low speeds and an extended speed range of operation. The dual pole operation can be used to extract high torque during starting with a high pole configuration and an increased constant power region with a lower pole operation. The design and control of a 4-pole/2-pole induction motor is presented in this article where pole-transition can be performed on the fly through electronic control. The electronic pole-changing is augmented through controls that stabilizes the flux of the incoming pole of operation before initializing a change in torque commands. Torque and power characteristics of the pole changing motor are shown to have enhanced performance in the constant power region in comparison to the baseline motor. Appropriate torque and flux commands are used to experimentally demonstrate a smooth electronic pole-changing transition with minimum torque transients.}, number={6}, journal={IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS}, author={Latif, Taohid and Agoro, Sodiq and Jaffar, Mohamed Zubair M. and Husain, Iqbal}, year={2023}, month={Nov}, pages={6704–6714} }
 @article{latif_agoro_jaffar_husain_2023, title={Dynamic Loss Minimization Control of a 4-Pole/2-Pole Electronic Pole-Changing Induction Motor Using a Look-Up Table}, volume={59}, ISSN={["1939-9367"]}, DOI={10.1109/TIA.2023.3307054}, abstractNote={A pole-changing motor with dual pole configurations can operate over an extended torque-speed region of operation. The higher pole configuration can be used for high torque in the low-speed region of operation, whereas at higher speeds an enhanced constant power speed region can be obtained with the lower pole configuration. The pole-changing can be accomplished electronically by changing the current directions in certain windings by using an inverter. This article discusses the current and flux dynamics associated with pole changing and presents a controller for the 4-pole/2-pole induction motor that initiates a pole change from one pole configuration to another with a power loss minimization method when the operating region overlaps for the two pole configurations. Simulation and experimental results using a look-up table-based loss-minimization approach are provided to validate the control method. The electronic pole-changing control results demonstrate a smooth torque transition while minimizing the motor loss.}, number={6}, journal={IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS}, author={Latif, Taohid and Agoro, Sodiq and Jaffar, Mohamed Zubair M. and Husain, Iqbal}, year={2023}, month={Nov}, pages={6715–6725} }
 @article{agoro_husain_2023, title={High-Fidelity Nonlinear Modeling of an Asymmetrical Dual Three-Phase PMSM}, DOI={10.1109/IEMDC55163.2023.10238985}, abstractNote={Asymmetrical dual three-phase interior permanent magnet synchronous motors (ADTP-IPMSM) exhibit high torque density and low torque ripple advantages but are associated with complex dynamics that include nonlinear magnetic saturation, spatial harmonics, and mutual cross-coupling between the two stator windings. This paper focuses on simple nonlinear modeling techniques based on stator flux linkage data to simulate the dynamics and electromagnetic torque of ADTP PMSMs. The developed modeling approach has been validated with results from a finite element analysis. The superiority of the nonlinear models over conventional linear models is presented in the paper.}, journal={2023 IEEE INTERNATIONAL ELECTRIC MACHINES & DRIVES CONFERENCE, IEMDC}, author={Agoro, Sodiq and Husain, Iqbal}, year={2023} }
 @article{agoro_husain_2023, title={Model Predictive Control With Double Virtual Vector Modulation for Suppressing Common Mode Voltages in Dual Three-Phase Drives}, ISSN={["1557-9948"]}, DOI={10.1109/TIE.2023.3335479}, abstractNote={A model predictive control (MPC) method coupled with a novel asymmetrical modulation of a unique set of virtual voltage vectors to suppress the high-frequency common-mode (CM) voltage in dual three-phase drives is presented in this article. The MPC method is based on an ultralocal model and a disturbance observer for model-free implementation offering a highly robust control performance. Synthesizing the control voltage with only one of the identified virtual vectors suppresses the net CM voltage, but will result in high current ripples under heavy loads. The current quality performance issue is addressed in this article using an asymmetrical modulation strategy consisting of two virtual vectors and one null vector to balance the tradeoff between CM voltage suppression and current ripple in the entire operating region. Furthermore, a simplified switching sequence is developed for ease of implementation on a low-cost processor. The validity and performance of the proposed model-free predictive control and modulation method are verified and compared with conventional linear control with interleaved space vector modulation through simulations and experiments on an asymmetrical dual three-phase permanent magnet synchronous motor (PMSM) drive.}, journal={IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS}, author={Agoro, Sodiq and Husain, Iqbal}, year={2023}, month={Dec} }
 @article{agoro_husain_2023, title={Model-Free Predictive Current and Disturbance Rejection Control of Dual Three-Phase PMSM Drives Using Optimal Virtual Vector Modulation}, volume={11}, ISSN={["2168-6785"]}, DOI={10.1109/JESTPE.2022.3171166}, abstractNote={Model-based predictive current control (MBPCC) relies heavily on adequate system modeling and accurate parameters. The detailed models of dual three-phase permanent magnet synchronous motors (PMSMs) contain mutual cross-coupling dynamics which make it difficult to extract accurate parameters. Also, some of the physical parameters of PMSMs are generally nonlinear functions of current and rotor position. In this article, a model-free predictive current control (MFPCC) based on an ultralocal model and an extended state observer is proposed for an asymmetrical dual three-phase (ADTP) PMSM. The MFPCC method is shown to provide superior current regulation when compared to the standard MBPCC approach under uncertain parameter conditions. Furthermore, the harmonic currents and the current ripple in the ADTP PMSM drive have been regulated to near-zero values by using optimized voltage vectors comprised of virtual vectors and null vectors. A generalized center-aligned pulsewidth modulation (PWM) scheme is presented to facilitate the synthesis of the optimal virtual voltage vectors for implementation on a low-cost digital signal processing platform. The performance improvements of the MFPCC with optimal virtual vector modulation are verified and compared with the conventional MBPCC method in both simulations and experiments on a surface-mount type dual three-phase PMSM.}, number={2}, journal={IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS}, author={Agoro, Sodiq and Husain, Iqbal}, year={2023}, month={Apr}, pages={1432–1443} }
 @article{agoro_husain_2022, title={Common-Mode Voltage Mitigation in Dual Three-Phase Drives using Predictive Control and Modulated Virtual Vectors}, ISSN={["2329-3721"]}, DOI={10.1109/ECCE50734.2022.9947806}, abstractNote={A model predictive control (MPC) method coupled with using a unique set of virtual voltage vectors for a dual three-phase (DTP) permanent magnet synchronous motor (PMSM) drive system to reduce and eliminate high-frequency common-mode (CM) voltage is presented in this paper. The MPC method uses vector space decomposition to map system variables into two orthogonal subspaces, one representing the energy conversion terms and the other reflecting the harmonic components. Using the separated variables, the controller synthesizes the virtual voltage vectors to reduce system CM voltages. The performance of the proposed control and modulation method is verified and compared with the standard space vector modulation (SVM)-based methods through simulations and experiments.}, journal={2022 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)}, author={Agoro, Sodiq and Husain, Iqbal}, year={2022} }
 @article{agoro_husain_2022, title={Robust Deadbeat Finite-Set Predictive Current Control With Torque Oscillation and Noise Reduction for PMSM Drives}, volume={58}, ISSN={["1939-9367"]}, DOI={10.1109/TIA.2021.3130022}, abstractNote={This article proposes a unique control strategy for a deadbeat multiple vector finite-set model predictive current control with an embedded integral action (MV-FMPC) for permanent magnet synchronous motor drives. Torque ripple and phase current distortions in permanent magnet synchronous motor (PMSM) drives are minimized with the proposed controller by adopting the multiple vector approach to the finite-set model predictive control. The controller uses a hexagonal co-ordinate system to simplify the location and identification of the virtual vectors created, thereby eliminating the use of large look-up tables and reducing computational burden. When used with the proposed deadbeat prediction model, the overall steady-state performance, system robustness, and quality of disturbance rejection are improved compared to the state-of-the-art finite-set model predictive current control (FS-MPC) methods with pulsewidth modulation. The improvements are due to the modified deadbeat prediction model with integral action, the algorithm used for multiple virtual voltage identification and the retention of the cost function in the proposed method. The proposed deadbeat MV-FMPC method and its improvements over the conventional FS-MPC have been verified through simulation and experiments with an interior-type permanent magnet synchronous machine.}, number={1}, journal={IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS}, author={Agoro, Sodiq and Husain, Iqbal}, year={2022}, month={Jan}, pages={365–374} }
 @article{islam_agoro_chattopadhyay_husain_2021, title={Heavy Rare Earth Free High Power Density Traction Machine for Electric Vehicles}, DOI={10.1109/IEMDC47953.2021.9449585}, abstractNote={A compact, heavy rare earth free permanent magnet synchronous machine with a volumetric power density of 50kW/liter is designed for electric traction applications. This is facilitated by innovations in the stator winding topology, magnet arrangement, and cooling technique. A 24-slot/10-pole dual three-phase asymmetric winding layout is adopted to improve power density, reduce harmonic losses, and improve fault tolerant capabilities. Furthermore, a novel segmented V-type magnet arrangement is proposed to address the demagnetization issues of the heavy rare earth free magnets under extreme temperatures and negative electromagnetic fields. An extensive finite element analysis has been conducted and results are presented to show the electromagnetic and demagnetization performance as well as the thermal capabilities and structural integrity of the proposed design.}, journal={2021 IEEE INTERNATIONAL ELECTRIC MACHINES & DRIVES CONFERENCE (IEMDC)}, author={Islam, Md Sariful and Agoro, Sodiq and Chattopadhyay, Ritvik and Husain, Iqbal}, year={2021} }