The primary winding of the transformer, fixed to the rotor, is excited by an alternating current causes voltages to appear between the Y-connected secondary windings fixed spatially at 120 degrees to each other on the stator.
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
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