Slotless brushless DC motors find more and more applications due to their high performance and their low production cost. This paper focuses on the windings inserted in the airgap of these motors, and particularly, to an original production technique which consists in printing them on a flexible printed circuit board. It shows theoretically that this technique, when coupled with an optimization of the winding shape, can improve the power density of about 23 % compared with basic skewed and rhombic windings made of round wire. It also presents a first prototype of a winding realized using this technique and an experimental characterization aimed at identifying the importance and the origin of the differences between theory and practice.
Dehez, B., Baudart, F., Markovic, M., & Perriard, Y. (2014). Theoretical and Experimental Investigation of flex-PCB Airgap Windings in Slotless BLDC Machines. IEEE Transactions on Industry Applications, 50(5), 3153-3160. https://doi.org/10.1109/TIA.2014.2301862 (Original work published 2014)