Resolver signal requirements for high accuracy resolver-to-digital conversion

An analysis of the effects of the most common nonideal resolver signal characteristics on the position accuracy achievable using a tracking R/D (resolver-to-digital) converter is conducted. Expressions for position accuracy achievable due to inductive harmonics, inductive DC component feedthrough, quadrature error, amplitude imbalance, and imperfect quadrature component rejection are developed. The difficulty in achieving the high position resolution and accuracy capabilities of a tracking R/D converter is assessed, and several methods for minimizing nonideal resolver signals are discussed. The results of this work establish criteria which can be used in the design of resolvers