Servo stabilizer, Relay type voltage stabilizer 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. Buck/Boost Transformer: Buck/Boost transformer
connected between mains input and out of stabilizer of load terminals. One terminal of primary of buck boost transformer permanently connected to fixed tapping of auto transformer while another end connect to motor shaft.Auto transformer: It has toroidal shape and auto transformer connected between neutral point and phase of input power supply. Motor: One end of Primary of Buck Boost transformer connected to shaft of this motor with arm and brush mechanism. When motor moves then this arm shaft moves across winding of auto transformer to increase or decrease number of winding. Motor is generally AC Synchronous motor or DC servo motor which is connected and it is fitted on top of auto transformers centre point.
Motor Driver: It is purely electronic circuitry which controls movement of motor. This microprocessor continuously receives values of input voltages. Based on amount of high voltage or low voltage observed at input, Motor driver" moves servo motor across winding of auto transformer so as to increase of decrease no of winding and hence voltage across primary of buck boost transformer. Hence when there is change in voltage across primary of buck boost
transfer then induce voltage across its secondary also changes. This process takes place continuously so as to correct input voltages. In case of 3 Phase automatic Voltage Regulator is independent phase controlled then it will have above arrangement for all three phases separately. To understand working of servo stabilizer please not really that voltage through secondary of Buck Boost transformer is nothing, but output voltage of stabilizer.