The slot impedance: experimental verification

Computational cost is high in eddy-current finite-element solutions because the magnetic vector potential A varies exponentially, resulting in fine meshes. The surface-impedance boundary condition can be used to eliminate eddy-current parts without external current sources. In slots, however, the variation of A is very rapid even in the air, and modeling these parts in electric machinery is very costly. The authors introduce the slot impedance, which is very similar to the surface impedance, and show how to remove the slots using the slot impedance as a boundary condition. Laboratory verification of the model is described