An Improved Non-Overlapping Reluctance Resolver Under Eccentricity Faults

In this article, an improved model of reluctance resolvers for accurate angular position detection in the presence of static, dynamic and mixed eccentricity faults is presented. In order to improve the accuracy of the resolver, first, a reference non-overlapping reluctance resolver is introduced and simulated. Various types of eccentricity faults are then implemented mathematically in the Maxwell software. The resolver's performance under different eccentricity faults is simulated, and the fault with the greatest impact on the accuracy is selected. Next, proposed resolver's tooth dimensions are parametrically defined using parameters α and β, and sensitivity analysis is performed using FEM. The optimal values of these two parameters are obtained by comparing the simulations’ results. Subsequently, the resolver with optimized dimensions is presented, and its performance is evaluated in the absence of the faults. The output characteristics of this resolver confirm its performance accuracy under normal conditions. Furthermore, the resolver is simulated under different eccentricity faults, and more precise performance is validated as well. Due to the same size and excitation for both conventional and proposed models, this model can replace the conventional ones in all industries.