Servo Voltage Stablizer

About Servo Voltage Stablizer

Servo stabilizer is a system, which provides stable Alternate Current (AC) output voltage where the input power supply voltage changes drastically. It protects the costly equipment from high and low voltage problems. It also increases the life of equipments and increases the productivity of machineries and reduces wastage and damage of raw materials by providing stable electric supply. The name Servo is related with the type of motor, which is used to enable the voltage correction (by using the Servo motor and variac with a buck-boost transformer.)

This type of stabilizer assures stable output power supply, protection from low voltage, high voltage, overload and short circuiting.

Applications of servo Voltage Stabilizers

The Servo Voltage Stabilizers are widely used in engineering units, pharmaceutical units, cold storage, air conditioning plants, offset printing machines, textile mills, cement plants, flour mills, oil industries, paper mills, rubber industries, tea estates, food processing units, oil and Vanaspati plants, footwear and leather units, distilleries and beverages, clubs, hotels, multi-storeyed buildings, hospitals, nursing homes, export houses and call centres.

Advantages of using Servo Voltage Stabilizers:

• protects the life of the equipment from severe voltage fluctuations.
• provides regulation with overall energy saving (98+% efficiency).
• no consumables are needed.
• improvement in quality of goods.
• increased production by reducing the manufacturing defective items.
• better safety and protection.
• fewer breakdowns and
• uniform quality of end products.

Components of Servo Voltage Stabilizers

Servo motor controlled automatic voltage stabilizer consists of following components

• Buck/boost transformer:

Buck/Boost transformer connected between mains input and output of stabilizer of load terminals. One terminal of primary of buck-boost transformer permanently connected to fixed tapping of auto transformer (variac) while another end connects to motor shaft.

• Auto transformer(Variac):

Autotransformer 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 autotransformer 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 autotransformers centre point.

• Motor driver

It is an electronic circuit which controls movement of motor. It consists of PCBs consisting of solid state circuitry made up of capacitor, registers, transistor, microprocessor and ICs.

Working principle of Servo Voltage Stabilizers

Voltage received from mains at input of SCVS is continuously sensed by sensing circuit and gives feedback to main control circuit which consists of a microprocessor. This microprocessor continuously receives values of input voltages and compares with the reference value embedded in its program. Whenever there is high or low voltage at input of SCVS, the microprocessor gives trigger to motor driver.

Based on amount of high voltage or low voltage observed at input, motor driver moves servo motor across winding of autotransformer (variac) so as to increase or decrease the number of winding and hence voltage across primary of buck-boost transformer.

The Servo motor shaft is connected to primary of Buck-Boost transformer and when there is change in voltage across primary of buck-boost transfer, the induced voltage across its secondary also changes. The motor moves in such a way that proper voltage is applied across the buck-boost primary so that the output voltage should be equal to set or desired output voltage of Servo stabilizer.

This process takes place continuously so as to correct input voltages

In case of 3 Phase Automatic Voltage Regulator, there is an independent phase controlled unit for each of the three phases separately. (essentially) to check there are 3 number of Single Phase Servo Stabilizer in one three phase stabilizer.

Exceptional Voltage Regulation with Custom Options

Our Servo Voltage Stabilizer provides consistent, linear voltage output, optimised for three-phase industrial and commercial applications. Operating efficiently at 95% and above, it safeguards sensitive equipment from voltage surges and fluctuations. The unit's design is fully customisable, allowing adaptation to various installation spaces and power requirements, offering flexibility and scalability for businesses.


Built for Performance and Durability in Harsh Environments

Crafted from robust CRCA steel, with armoured copper and aluminium cabling, this stabilizer is engineered to endure heavy-duty usage and extreme ambient temperatures up to 50C. Its IP54 and IP57 protection ensures reliability against dust, water, and other environmental factors, making it particularly well-suited for deployment across diverse Indian industrial sites.


Smart Monitoring and Safer Operations

Equipped with advanced digital LED displays, the Servo Voltage Stabilizer provides precise real-time monitoring of voltage, current, and operational status. Protection features such as high insulation resistance (50KV) and over-voltage safeguards ensure uninterrupted power supply, reducing downtime and protecting valuable equipment from electrical hazards.