Resolvers are similar, but they have two stator coils at a 90° orientation rather than the 120° configuration of the synchro. Now real power is developed in the loop, and the CT simply generates an error voltage. The control transmitter (CX) and control transformer (CT) are high-impedance versions of the TX and TR. The rotor of the TR will take a position closely approximating that of the TX in order to balance the current flowing in the loops. The TR is simply a low-impedance synchro being run backward. When the output of a TX is supplied to the stator windings of a torque receiver (TR), the rotor of the TR will rotate. The torque transmitter (TX) is a synchro that is capable of driving enough current to actually do work. Synchros resemble three-phase motors, and in fact are in some ways used like them. The synchro and the resolver are probably the earliest applications of inductive measuring techniques.
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