Influence of Winding Placement on the Motor Copper Losses with High Frequency Power Supply

Abstract

AbstractThe high frequency in motors leads to obvious skin, proximity effects and circulating current for parallel strands. The AC copper losses of stator winding will be produced by these high-frequency effects, which will have a negative impact on the efficiency of the motor and should be reduced. To simplify the analysis, this paper proposes five different two-dimensional winding model, which indicates that the AC copper losses calculation error of the one slot winding model and the motor winding reference model is minimal. High frequency copper losses are very sensitive to the position of strands. For this study, the machine models all strands in one slot. In this paper, horizontal bundles and vertical bundles model are established and the two different winding arrangements are compared and analyzed. The simulation results show that if strands are horizontal placement in the slot, it can effectively reduce the AC copper losses. At rated current frequency, the copper loss ratio generated by the vertical placement is 1.59 times that of the horizontal placement.KeywordsCopper lossesWinding placementHigh frequency motor lossesSkin effectProximity effectCirculating currents