An optimized axial flux variable reluctance resolver with concentric windings

Radial flux variable reluctance resolvers (RFVR
²
s) are widely used in variety of applications. However, they suffer from an intrinsic error which is called static eccentricity (SE). Although most of the errors in the resolvers can be suppressed using electronic methods in resolver to digital (R/D) converters, static misalignment is an exception. In this paper an axial flux configuration is proposed for variable reluctance (VR) resolvers with concentric windings. Then the proposed structure is optimized to achieve the minimum sensitivity of accuracy against SE. The performance of the presented structure, so called axial flux variable reluctance resolver (AFVR
²
), is validated using 3-D time stepping finite element method and compared with that of RFVR
²
. Results show the robustness of the optimized structure against static misalignment.