Optimal Design of Outer Rotor VR Resolver Based on MEC Model

The outer rotor permanent magnet (PM) machines are increasingly popular in industrial applications due to their high power and torque density, direct coupling benefits, and low maintenance costs. For high-performance closed-loop control, suitable position sensors are essential. Outer rotor variable reluctance (VR) resolvers are among the best options for such applications. This article discusses optimal design considerations for outer rotor VR resolvers using a magnetic equivalent circuit (MEC) model, which incorporates the effects of mechanical faults. The optimization aims to enhance accuracy, simplify manufacturing, and reduce the likelihood of electrical faults. The results are validated through experimental measurements on a prototyped sensor.