Phase sensitive rectifier circuit

The transmitter (FZ) winding and the receiver (sz) three-phase winding are connected in a one-to-one correspondence. 110V AC voltage is supplied to the transmitter excitation winding. The initial
angle is Q. The output voltage and phase at both ends of the receiver stator winding can reflect that of the transmitter. The rotor angular displacement reflects
the size and direction of the error angle between the rotor and the transmitter. When balanced, the output voltage is zero, otherwise, an error occurs and a voltage signal is output . The picture shows a single-phase full-wave phase-sensitive
rectifier. The two groups work alternately, with voltage output on the resistor 5.lkfl respectively, and RP1 is used to adjust the balance. The rectification converts the AC signal into a DC signal , which is sent to the input end of the speed loop (ST) of the operational amplifier through
RP2 for amplification.