Very Fast Prediction of MMF Harmonics Content in Multiphase Electrical Machines

Multiphase windings or other special windings (fractional-slot, tooth-concentrated, multilayer) have been gained a great interest over the last years due to some advantages that this type of windings provides for alternative current (a.c.) electrical machines. This paper aims to help the machine designer to select the proper winding configurations and to sort out the best winding layout. The classical method based on star of slots and Fourier-series expansion of the air-gap MMF wave was implemented on the computer to quickly determine the values of the main winding factor, space harmonic content and differential leakage coefficient in order to identify the optimal winding structure. Thus, the proposed application becomes a helpful tool in the design process and can be applied for any type of single or multiphase winding layout irrespective of number of layer or number of conductor per slot. The paper also describes how to use this new and original application that is free available on the website www.sarlota.de/RunFastMMF56.html.