3-D Modeling and Analysis of Shaded Pole Motors Using Finite Elements Method
AbstractAmong the electrical machines the shaded pole motors are the most difficult ones in terms of modeling and analysis. This difficulty is arising from the non-uniform airgap and unbalanced windings on its stator. Because ofthese the airgap flux contains rich space harmonics, and this complicates the mathematical modeling and simulation of these machines. On the other hand, small size of these machines results in strong end effects. Hence the 3-D modeling of magnetic field analysis poses an important advantage. Therefore, in this presentation a 15 W, 4 pole shaded pole motor has been modelled in 3-D using Finite Elements (FE) method to determine some important performance parameters such as the airgap flux distribution and the saturation effects in the motor laminations. In this process magnetic field distribution have been obtained for three different case which are: a) Main winding is excited but shading rings and rotor cage are not excited b) Shading rings are excited, but stator winding and rotor cage are not excited c) Both the stator winding and shading rings are excited, but rotor cage is not excited Finally, advantages accrued from such an analysis is discussedin detail.