Study on Winding Method for Improving Accuracy of Variable Reluctance Resolver

Electric vehicle (EV) drive systems primarily utilize Permanent Magnet Synchronous Motors (PMSMs) due to their high-power density and efficiency. Precise rotor position detection is essential for high-performance vector control of PMSMs; therefore, resolvers are well-suited as position sensors in EVs owing to their simple structure, durability, and environmental robustness. However, significant position errors can lead to reduced output torque, increased torque ripple, and mechanical vibration. Consequently, this paper proposes two novel winding methods—Overlapping winding and Parallel winding—to enhance the position accuracy of Variable Reluctance (VR) resolvers. The position error was analyzed using Finite Element Analysis (FEA) via Ansys Maxwell and an RDC tracking method implemented in Excel VBA. The results confirmed that the proposed methods are effective in significantly improving precision.