Universal Magnetic Circuit for Resolvers with Different Speed Ratios [Instrumentation Notes]

This paper proposes a universal magnetic circuit for resolvers with different speed ratios. A resolver is an electromechanical transducer that converts the angular position of a rotor into an electric signal. The analysis and test results led to the conclusion that by using an appropriate magnetic material and assuring high-precision manufacturing it is possible to obtain high-precision resolvers with electrical error well below 1 minute of arc. Also it was proved that by using a single type of magnetic circuit it is possible to create multipole, two-speed resolvers. This system is used to improve both accuracy and resolution of angle measurement.