Error Analysis and Compensation Method Research of Airborne Reluctance RVDTs

As the key sensor, the airborne reluctance Rotary Variable Differential Transformers (RVDTs) played an important role in the aircraft servo system. The measurement accuracy of an angle measurement system mainly depends on the measurement accuracy of the rotary transformer and the conversion accuracy of Resolver-to-Digital Converter (RDC). The main factors affecting the measurement accuracies of sine and cosine RVDTs are the sine and cosine function error and cross-axis error, and due to the limit of processing, as well as the impacts of magnetic material, nonlinear, linear characteristics, and assembly accuracy. These two errors are difficult to get a large improvement to a certain extent. To ensure the accuracy of servo system positioning, this paper presents an error analysis and compensation method.