@article{jung_husain_2023, title={Analytical Modeling of 3D Airgap Slotless Halbach Permanent Magent Synchronous Machines}, DOI={10.1109/IEMDC55163.2023.10239047}, abstractNote={This paper presents an analytical model for 3D airgap slotless Halbach permanent magnet synchronous machines which utilize both radial and axial airgaps. The proposed model estimates the permanent magnet flux linkage and inductance by combining magnetic fields predicted from the four 2D subdomain models for the radial flux main, radial flux overhang, axial flux main, and axial flux overhang segments expressed in terms of Fourier series. For the overhang segments, multi-slice technique is used to predict the flux linkages for the round corner of the coils. The end effect leakage compensation method for the axial flux segments is derived from a magnetic equivalent circuit model and the end winding inductance is calculated analytically. The proposed model can predict permanent magnet flux linkage and inductance of the 3D airgap slotless machines within 3 percent error range compared to the 3D finite element method model at one order of magnitude less computational time.}, journal={2023 IEEE INTERNATIONAL ELECTRIC MACHINES & DRIVES CONFERENCE, IEMDC}, author={Jung, Junyeong and Husain, Iqbal}, year={2023} } @article{jung_husain_2022, title={Comparison of Subdomain Models for Outer Rotor Slotless Halbach Array Permanent Magnet Synchronous Motors}, DOI={10.1109/ITEC53557.2022.9813907}, abstractNote={Two different types of semi-analytical models for outer rotor slotless Halbach array PMSMs with teeth for cooling channels are introduced. The first model considers the coils and the teeth for cooling channels as a continuous region while the second model define separate regions for the (virtual) slots and teeth. The accuracy and computational time with respect to a commercial Finite Element Method (FEM) package for the models are compared for static and transient analysis with a 14 pole fractional slot concentrated winding (FSCW) machine.}, journal={2022 IEEE/AIAA TRANSPORTATION ELECTRIFICATION CONFERENCE AND ELECTRIC AIRCRAFT TECHNOLOGIES SYMPOSIUM (ITEC+EATS 2022)}, author={Jung, Junyeong and Husain, Iqbal}, year={2022}, pages={55–60} } @article{chattopadhyay_islam_jung_mikail_husain_2022, title={Winding Embedded Liquid Cooling for Slotless Motors in Transportation Applications}, volume={58}, ISSN={["1939-9367"]}, DOI={10.1109/TIA.2022.3191629}, abstractNote={A novel winding embedded liquid cooling (WELC) concept is presented to improve the thermal management of slotless motors for transportation applications. The concept introduces liquid cooling channels through the non-magnetic thermal plastic winding support in a slotless motor to reduce the thermal resistance between the heat source and the sink. This article demonstrates the efficacy of the WELC concept for a 11.5-kW slotless motor using computational fluid dynamics (CFD). A lumped parameter thermal network has also been developed for the WELC concept, which has been validated using the CFD analysis. The simulation results of WELC concept have been experimentally validated for an 11.5-kW slotless motor. It is shown that the WELC concept can achieve a continuous current density of 19.0 A(rms)/mm

$^{2}$

for an allowable temperature rise of 80

$^{\circ }$

C; the achieved continuous current density is 35% higher than that of a conventional axial in-slot water jacket cooling. The short time (18 s) peak current density achieved with the WELC concept is 39.8 A(rms)/mm

$^{2}$

.}, number={6}, journal={IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS}, author={Chattopadhyay, Ritvik and Islam, Md Sariful and Jung, Junyeong and Mikail, Rajib and Husain, Iqbal}, year={2022}, month={Nov}, pages={7110–7120} }