A Comprehensive Investigation of Winding Eddy and Circulating Current Losses of Stator Iron Coreless PMBLDC Motors

A method is proposed to comprehensively study the eddy and circulating current losses of stator winding wound by multiple parallel strands, further improve power density iron coreless permanent magnet brushless DC (PMBLDC) motors. Analytical models in are deduced firstly explicitly express influencing factors these two losses. As shown, mutually contradicting. While loss can be greatly reduced using conductor will extensively increased. The losses, such as strand diameter, magnetization types, rotating speed, investigated. prototype PMBLDC motor without an inner rotor core manufactured tested validate theory. experimental results with different combinations diameters numbers agree well theoretical results.