Synchros are commonly used on shipboard applications to transmit position information from one area of the ship to another. When synchros are used on aircraft, the S2 output is usually grounded, eliminating the need to run the third output wire. Resolvers consist of a rotor input (R1 and R2) and two stator windings, wound physically 90(degree) apart as shown in Figure 1. A reference oscillator is connected to the rotor to provide excitation. The outputs of each stator winding are sinusoidal waveforms whose magnitudes are proportional to the sine and cosine of the angle of rotation of the shaft. Synchros and resolvers can operate with input voltages from 0.5 to 115 Vrms over frequencies ranging from 60 Hz to 100 kHz. Some standard rotor voltages are 26 Vrms, producing 11.8 V line-to-line, or 115 Vrms, producing 90 V line-to-line. The synchro/resolver output signals may be converted to digital.
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