Performance Analysis of Wound Rotor Brushless Resolvers under Run out Fault

Resolver is an electromagnetic position sensors. To ensure the performance of the resolver is not deteriorated by the eccentricities, pancake resolvers are employed in industrial applications. The accuracy of pancake resolvers is suspected to be influenced by run-out fault. In this paper, the effect of run-out fault on the accuracy of the wound rotor resolver is studied by 3-D time stepping finite element method (TSFEM). Then, the contribution of the resolver’s rotor and the secondary of rotary transformer (RT) in the detected error is determined. Based on the analysis, an optimized structure is proposed to decrease the effect of run out fault. Finally, the success of the optimization is validated using experimental tests on the prototype of the sensor.