Analyzing and Suppressing of Circulating Current Loss in High-speed Permanent Magnet Motors

This study examines the impact of circulating currents on copper loss in alternating current systems and introduces a method to reduce these losses. Initially, a circuit model for the winding is developed to analyze the magnetic leakage field in the stator slot. Subsequently, an equivalent model based on this magnetic leakage field is constructed to assess the magnetic linkage of the strand as the conductor’s position within the slot varies. Comparisons of circulating currents in two different winding configurations are presented. Based on these analyses, a specific winding arrangement designed to reduce circulating current losses is proposed. The effectiveness of this design is then corroborated through experimental validation.