Numerical analysis of magnetic field distribution in an air gap with the effects of slot depth and width

Abstract

This paper presents a numerical analysis of magnetic field distribution in an air gap with the effects of slot depth and width. A dimensionless parametric approach is utilized to cover wide ranges of parameters that frequently appear in electric machine design. A nonlinear two‐dimensional Maxwell equation is solved by using a finite‐difference successive relaxation technique. Constant fluxes are applied for the investigation of nonlinear effect through the region of study, and average reluctances in the air gap are calculated and compared with the Carter number reported in existing literature. Flux plot with normalized air gap G=0.1; besides, various slot depth D, half slot width W, the Carter number with parameters G=0.1–0.2, D=0.2–3.0, and W=0–0.8 are presented.

Key Words:

• magnetic field
• air gap