Three-Dimensional Modeling of Shielding of Magnetic Stray Fields Based on Superposition of 2-D Models

This paper concerns the superposition of 2-D semianalytical models to model 3-D shielding configurations. The 2-D semianalytical models are used to describe the effect of magnetic shielding on the stray field of a single-sided coreless linear permanent-magnet motor. The modeling results are compared to 3-D finite-element analysis and to measurements. It is found that an accurate description of the tendencies and the order of magnitude is given. Furthermore, the comparison of the superposition of 2-D semianalytical models with the measurements shows that saturation and neglecting the 3-D effects cause the deviation between model and measurement.