A new fast tracking resolver for mechanical angle measurement

The resolver is a mechanical angle and rotational speed transducer that operates as rotary transformer; its two stator windings are excited with sine and cosine AC signals and its rotor winding produces a sinusoidal signal that presents a phase shift relative to the excitation and equal to the mechanical angle of the rotor. A novel and simple resolver converter is developed in order to extract the mechanical angle from its signals. The proposed method is based on a phase-locked loop technique and produces a measure of the angle that tracks the true mechanical angle of the rotor. The paper presents full details of the converter, Matlab simulation and experimental results.