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What's a Resolver?

A resolver is a form of synchro in which the windings on the stator are displaced mechanically by 90 degrees to each other, while the Synchro is displaced by 120 degrees.  Resolvers are used most often as an angle measurement transducer whose "analog" output is converted to a "digital" format using a Synchro-to-Digital Converter (S/D or R/D). Resolver Photo
Many Resolvers today are "brushless" types (as shown at right) where, instead of using "brushes" and slip rings, the rotor excitation is "transformer" coupled to the shaft rotor winding.  Resolvers of this type are very reliable, and can be used in the most demanding applications.  Resolvers come in a variety of shapes and sizes, many of which are designed (electrically & mechanically) for specific applications. 
 
Brushless
                        Resolver
The electrical schematic for a resolver is shown to the right.  Resolvers (like 3- wire Synchros) can be thought of as "variable transformers".  Shaft angle rotation, with an "AC" voltage applied to the "Rotor" shaft winding, causes a change in the Resolver's "stator" output voltage. Resolver Schematic
 
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Last Updated 05/05/2017