Stator/Rotor Windings

Stator/rotor windings are conductive coils, typically made of insulated copper or aluminum wire, wound around laminated cores within feedback devices like encoders and resolvers. In resolvers, these windings function as transformers: the rotor winding (excitation winding) receives an AC reference signal, inducing voltages in the stator windings (sine and cosine windings) proportional to the rotor's angular position. In encoders, windings may be part of inductive or magnetic sensing elements. They are critical for converting mechanical rotation into electrical signals, providing accurate angular position, speed, and direction data to control systems in motors, robotics, and automated equipment.

Operates on electromagnetic induction. In resolvers, an AC excitation current in the rotor winding creates a varying magnetic field. As the rotor turns, this field couples with stationary stator windings, inducing output voltages whose amplitudes vary sinusoidally with the rotation angle (sine and cosine outputs). The phase or amplitude modulation of these signals encodes the position. In inductive encoders, windings interact with a toothed rotor to generate periodic signals. The precise winding patterns and phase relationships enable high-resolution position detection.