Convolution approach for analysis of magnetic forces in electrical machines
Purpose - The purpose of this paper is to present a method for analyzing higher magnetic force harmonics in electrical machines based on electromagnetic finite element simulation. Design/methodology/approach - Sampling of air gap field solution data allows for a Fourier decomposition of magnetic forces and flux densities. A two-dimensional convolution gives insight into the spectral decomposition of forces responsible for acoustic noise, vibration and higher torque harmonics. Findings - The proposed approach seems especially suitable for synchronous machine models. The influence of magnetic circuit design parameters that are difficult to calculate analytically on the harmonic air gap content can be analyzed and the spectral force decomposition illustrated by means of space vectors. Originality/value - The approach is generalized to the convolution and analysis of arbitrarily sampled two-dimensional data in this paper.
electric machines harmonics vibration magnetic measurement force measurement finite element analysis