Research and Analysis of Toroidal and Conventional Windings in Permanent Magnet Synchronous Machine

Abstract

Reasonable design of winding can improve the performance of the machine without increasing the weight and cost. The toroidal (TO) and tooth-coil (TC) windings have different spatial positions in the electromagnetic field and generate vertical magnetic field. If the characteristics of winding factor and the unified analysis method of the both can be researched, the windings with better performance can be obtained. Based on this, the winding characteristics considering harmonics and the design methods of single winding and combination of windings are analyzed. The "Halbach Winding" with the same effect as Halbach PM are designed and researched based on the study of TO, TC windings and their combination. According to the characteristics of the magnetic field mentioned above, the improved method of the machine using only winding to generate the traveling wave of Halbach magnetic field is proposed and analyzed. By improving the Halbach winding, it is possible to achieve a magnetic field that enhances one side and weakens the other side while reducing the minimum repetitive unit. And the feasibility of the above methods is verified by finite element analysis (FEA).