Subdomain Model for Predicting the Performance of Linear Resolver Considering End Effect and Slotting Effect

Linear position sensors are essential parts of linear motion control systems. Among different linear sensors, linear resolvers are an appropriate choice for harsh environments. Design optimization of linear resolvers needs an accurate, but computationally fast model for their performance prediction. Slotting effect of the cores and end effect are two important phenomena that must be accurately involved in the model to ensure its reliable results. Therefore, in this paper a semi-analytical model based on subdomain modeling technique is proposed for linear resolvers. Then, according to the developed model, the induced voltages in the signal windings of the resolver are calculated and consequently, the position error of the resolver is determined. Numerical results are subsequently obtained by time stepping finite element method (TSFEM) to verify the proposed model. Finally, experimental tests on the prototype sensor are conducted to verify the success of the simulations.