Investigation of angle measurement errors in a PCB-based resolver under eccentricity conditions

The resolvers are widely employed in motor control applications such as industrial machinery, electric vehicles, and robotic systems to determine the motor shaft angle. In conventional resolvers with radial-flux and rotor-wound structures, rotor windings are typically used. However, in this study, these windings were replaced with a Variable Reluctance Rotor configuration to enhance performance. A new high-performance resolver based on an axial-flux design was proposed. The resolver windings were implemented on a printed circuit board (PCB), forming a compact and cost-effective structure. Finite Element Method (FEM) simulations were conducted to evaluate the design. To assess the resolver’s performance, four different eccentricity conditions were introduced, and the system’s performance under these conditions was analyzed. The simulation results are presented graphically, illustrating both the maximum and average measurement errors. Furthermore, the Total Harmonic Distortion (THD) of the sine and cosine output signals was evaluated to examine the influence of eccentricity-induced errors on signal quality.