Synchro resolver basics
In its general physical construction, it is much like an electric motor. Synchros are often used for measuring the angle of a rotating machine or in case of selsyn (self-synchronous) configuration, used for controlling position of a device.
Synchro: Transducer that uses a transformer whose primary-to-secondary coupling may be altered by changing the relative orientation of the two windings. Synchro/Resolver Tutorial Guide QUICK LINKS