Design Optimization of Linear Variable-Reluctance Resolver for Higher Accuracy and Smaller Size

Linear variable reluctance (VR) resolvers offer robustness and affordability in comparison with wound mover sensors. However, the accuracy of linear sensors is influenced by geometrical dimensions and the longitudinal end effect. In this article, the end effect was compensated by altering the teeth’s shape using the tooth-pairing method. This altered shape could achieve much better accuracy. Furthermore, the influence of many different geometrical dimensions and shapes of teeth and yoke were examined using finite-element analysis (FEA). In addition, the results of this analysis show a trade-off between the accuracy and weight of the resolver in some cases. To verify the correctness of the simulation results, a prototype of the sensor was built and tested. Measured results were in close agreement with those of the FEA.