Sensitivity Analysis of Design Parameters in Limited-Angle Wound Rotor Resolver

This article presents the design considerations and a parametric analysis of a limited-angle wound rotor resolver (LAWRR) with high precision. LAWRRs are extensively employed in motion control systems requiring limited rotation, such as missile guidance and gimbal systems, radars, missile seekers, and gyro-stabilized electro-optical systems. The LAWRR's wound rotor has a limited rotation of 0°-360° and features an excitation (EXC) winding on the rotor with signal windings on the stator. Operating, geometric, and magnetic properties that affect the accuracy are determined. To reveal the influence of key operating and geometric design parameters on accuracy, a number of parametric analyses, including EXC current and frequency, air-gap and stack lengths, rotor skew angle, split ratio, and slot dimensions, were carried out employing the 2-D finite element analysis (FEA) method. The most prominent and critical design variables affecting the angular position error have then been determined. Time-averaged, peak-to-peak, minimum, and maximum position errors were calculated for accuracy analyses. Finally, experimental measurements on a prototyped LAWRR are employed to validate the numerical analysis results.