High-Precision Resolver-to-Velocity Converter

Accurate velocity estimation for rotary control over a large velocity range has been a challenge. In this paper, we propose a virtually analog resolver-to-velocity converter that applies trigonometric transformations to the resolver outputs. We also present hardware that extends the output range of a previously proposed resolver-to-position circuit from 90° to 360°. The position and velocity outputs of the two circuits are evaluated against the position and velocity obtained from an optical encoder using the backward difference differentiation technique. Recommendations for tuning and improvements in the circuitry are also provided.

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