Industrial Servo Stabilizers from Messung

Posted by messungelectricalengineering on March 26th, 2022

Voltage stabilizers are an essential and mandatory part of any office, commercial or industrial use. During the 1990s, manual stabilizers were widely used but today, with the evolution of electronic circuitry, servo stabilizers are used for industrial purpose.


A servo stabilizeris an integral part of any facility that uses electrical appliances and machinery. But what does a stabilizer do? Aservo voltage stabilizeris a servo-controlled stabilization system or device used to provide a constant voltage for equipment. With servo stabilizers in place, expensive machines are protected from any voltage fluctuations. The function of a stabilizeris to maintain optimum and steady voltage supply and also help to save on excess electricity usage.

Servo based voltage stabilizers are used for appliances/ equipment which are very sensitive and need accurate input power supply (±01%) for performing intended functions.


There are seven main stabilizer partsor components:

1. Dimmer (Variable Transformer): The basic purpose of dimmer is to increase or decrease the voltage which is fed to the buck boost transformer. 50% of the output voltage is increased or decreased by dimmer only.

2. Carbon Brush: a moving part fitted in the shaft to make the contact with dimmer. If the input voltage variation is very frequent, the carbon brush will erase early and need to be replaced frequently. Servo stabilizer manufacturers are advised to use best quality carbon brush.

3. Servomotor: the main part of a servo stabilizer. The motor rotates the arm connected on the dimmer in clockwise or anti clockwise direction according to input voltage.

4. Buck Boost Transformer: acts as a connector between the input and output load terminals. It is a transformer that manages the voltage settings that are remained upon voltage increase or decrease by the dimmer.

5. Contactor or Relay: contactor cuts the output voltage of any servo voltage stabilizer if it exceeds or goes higher than the prescribed limit.

6. MCB, MCCB: MCB is used for the protection of short circuit and MCCB is used for overload protection.

7. Electronic Circuit: connects all the components of the servo voltage stabilizer so that the signal passes in the correct way for effective working of the stabilizer.


No doubt you want to know, how does a stabilizer work?When the servo voltage stabilizerreceives an input current with fluctuating voltage, the microprocessors in the electronic circuitry triggers the Servo motor driver. This in turn activates the servo motor, which moves across the windings of the auto-transformer. As the servomotor’s shaft is connected to the primary of the Buck Boost transformer, the movement automatically adjusts and increases or reduces the voltage value to the prescribed limit almost instantly. This adjustment of input voltage to the correct output voltage is the aim of the servo motor and the purpose of a servo stabilizer.

This controlled voltage is relayed through the secondary of Buck Boost transformer, and then fed to the appliance or machinery in use.

Circuit Diagram of Servo Based Voltage Stabilizer

Servo voltage stabilizer is the only electric stabilizerthat can be used across single-phase and three-phase connections.


There are two types of servo stabilizers in the market: air-cooled and oil-cooled. While both work on the same principle, the oil-cooled stabilizer has a higher sustained overload capacity.

Servo voltage stabilizers can be single-phase or three-phase balanced types or three-phase unbalanced types.

Oil-cooled stabilizers are suitable for engineering & machine tools, CNC machines, elevators, plastic machines. Applications of air-cooled stabilizers include medical equipment, textile machines, telecom & data centres, printing machines, machines with sensitive microprocessors.


Electrical equipment like the X-Ray machines, PH-meter, etc. gets affected when there is a high voltage whereas compressors, refrigerators, etc. get damaged due to low voltage. Also, industrial equipment, analytical instruments, simple household electric machines, elevators, etc. get damaged (partially or completely) due to the high or low voltage supply. Electricity boards are also unable to provide clean power as the load is enormous and the number of electrical appliances running is too high.

Servo stabilizers help to control and avoid such problems, and offer several benefits:

  • Regulates voltage levels in various types of equipment
  • Protects equipment, assuring safety to industrial machinery and household appliances
  • Increases the performance and lifespan of the equipment
  • Enables limited usage of power, reducing electricity bills by 10-30%
  • Prevents the risks of power-related accidents during short-circuits or overloads; save life and property
  • Minimum maintenance required
  • Customizable to the current strength and voltage rates easily making it suitable for both industrial and residential uses.


Messung Electrical Engineering Division has partnered with Fuji Electric Consul Neowatt to market and supply Fuji\'s reputed range of air cooled and oil cooled industrial servo voltage stabilizersfor both balanced and unbalanced loads in a range from 3 to 3500 KVA.

As renowned servo stabilizer manufacturers, Fuji offers models for both indoor and outdoor applications and also provides customized products based on application requirements. They also offer a full range of isolation, ultra-isolation and K-rated transformers for various applications in a range from 3 – 1000 KVA.

Fuji’s servo controlled voltage stabilizers are suitable for CNC Machines, CMM, Textile & Spinning mills, Cold Storage units, Food processing equipment, CT Scan, MRI machines, Retail outlets, Restaurants and Office applications.

Based on your application and the type of machinery or electrical equipment involved, Messung can provide the most appropriate and efficient model ofservo controlled stabilizerfor your needs.

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Joined: February 27th, 2021
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