After optical rotary encoders, resolvers are the most commonly used type of displacement and angle sensor. They convert the angular position of a rotor to two voltages. The absolute position can be represented clearly in this way. Modern resolvers are usually brushless and the information is transmitted through induction. Unlike rotary or incremental encoders, resolvers provide an absolute signal within a single revolution and therefore do not have to be calibrated after switching on.
Resolvers are used for open and closed-loop control tasks such as electric servo drives, positioning drives and machines with interdependent motors. The robustness and availability of the systems are of central importance. Our brushless resolvers operate without wear and are fail-safe – even in the harshest environmental conditions (e.g. extreme temperatures).
