Farady Automatic step voltage regulator

There are mainly three types of Automatic step voltage regulator. Servo stabilizer, Relay type voltage stablizer & now newly introduce technology of static voltage stabilizer. To understand working of servo stabilizer, we need to understand different components of servo stabilizer and its functions. Servo motor controlled Automatic voltage stabilizer consists of following components .
1. Buck/Boost Transformer: Buck/Boost transformer connected between mains input and out of stablizer of load terminals. One terminal of primary of buck boost transformer permanently connected to fixed tapping of autotransformer while another end connect to motor shaft.
2. Auto transformer: It has toroidal shape and auto transformer connected between neutral point and phase of input power supply.