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A resolver is an electromagnetic transducer that can be used in a wide variety of position and speed feedback applications, including light / servo applications, industrial or heavy applications. Resolvers, known as motor resolvers, are generally used in servo motor feedback applications due to their good performance in high temperature environments.

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Since the resolver is an analog device and the electrical outputs are continuous during a complete mechanical revolution, the theoretical resolution of a single speed resolver is infinite. Due to its simple transformer design and the lack of electronic components on board.

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Resolver is a much more robust device than any other feedback device and is the best choice for those applications where reliable performance is required in high temperatures, high shocks and vibrations, radiation and contamination environments, which makes resolving a sensible design alternative for encoders with angular axis.

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HOW A RESOLVE WORKS

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A resolver outputs a signal by energizing the input phase of the resolver with an AC voltage (VAC) to induce voltage in each of the output windings. The amplitude of the resolver modulates the VCA input in proportion to the sine and cosine of the mechanical rotation angle.

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The resolver is sometimes referred to as an analog trigonometric function generator or a control transmitter. The function of the resolver is to solve a vector in its components (sine and cosine). Electric zero (EZ) is defined as the position of the rotor in relation to the stator where there is a minimum voltage amplitude in the sinusoidal winding and maximum voltage amplitude in the cosine winding when the input winding is excited with the rated voltage.

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The position or angle of the rotor is simply the arcangent of the voltage output of the sinusoidal winding divided by the output of the cosine winding. This metric ratio format provides an inherent noise reduction feature for any injected noise whose magnitude is approximately equivalent in the two windings and also results in a high degree of temperature compensation.