Comparison of Two Tubular Linear Permanent Magnet Machines with Translator Eccentricity

This contribution presents a comparison study of the translator eccentricity effects on two different tubular linear permanent magnet (TLPM) machines. One structure is a surface mounted PM machine, and the second has its PMs embedded in the translator structure. Both structures have the same type of PM and the same PM volume. The comparison study spans all operating conditions: open-circuit and underload conditions. It has been conducted for different eccentricity values. 3D finite element method is used. The comparison study is also exploited in order to analyze the impact of magnetic saturation on the machine under eccentricity effects. The eccentricity effects on one of the two structures were shown to be remarkably higher than on the other.