Modelling Axial Nonuniformity in Induction Machines Using a Multislice Magnetic Equivalent Circuit

The presence of axial nonuniformity poses challenges in the modelling of induction machines (IMs) by disrupting the machine cross-sectional consistency. To tackle these challenges, this article presents a multislice magnetic equivalent circuit (MEC)-based modelling approach. In this model, a machine with axial nonuniformity is partitioned into axially uniform sections along its axial direction, each treated as a slice. The length, angular displacement, and radial translation of each slice are determined using Gaussian discretisation. MECs are constructed for all slices and integrated under an identical current excitation, forming a multislice magnetic circuit model. The resultant magnetic circuit equations are combined with temporally discretised electrical circuit equations, establishing a strong electromagnetic coupling. This electromagnetic model is further weakly coupled with a mechanical model to fully characterise machine dynamics, thus completing an electro-magneto-mechanical coupling. The effectiveness of the proposed modelling approach is confirmed through experimental validation.