Servo stabilizer

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Introduction to servo stabilizer.

While managing an industrial facility, you will come across the need to ensure the protection of expensive electronic and electric equipment. Here when the role of a servo stabilizer becomes important. If there are issues with supplied voltage input, you will be at a loss. Voltage fluctuations are something that you cannot control. However, it will still be possible for you to minimize the damage caused by voltage fluctuations. That’s where you should invest your money to get a servo regulator.

A servo voltage stabilizer can help you provide a smooth voltage supply to all the electric and electronic equipment you have at your industrial facility. Continue to read, and we will share more details with you on servo motor stabilizers.

What is a servo voltage stabilizer?

A servo stabilizer, or a servo motor controlled stabilizer, can provide optimum voltage supply to you through its unique stabilization system. This stabilization system uses a boost/buck transformer booster. It can effectively capture voltage fluctuations and regulate the current to desired output. You can expect a servo voltage stabilizer to regulate the current in both clockwise directions as well as anticlockwise directions.

Servo motor stabilizer available with oil and forced air cooling. It is the best option for industrial loads. When it comes to handling sudden jerk which causes due to switching of heavy loads, a servo motor controlled regulators always stands out. We will also discuss application of servo stabilizers in detail.

What are the advantages of a servo stabilizer?

You can use a servo stabilizer to regulate output voltage in numerous industrial electric equipment you have. There is no need to think twice before using it to ensure the protection of expensive electric items. These voltage stabilizers can provide protection against all sorts of voltage issues as well. Hence, it is possible to ensure 100% protection for industrial equipment. Let’s list down some of the significant advantages of servo voltage regulators.

Benefits of servo motor controlled stabilizers.

Safety aspects.

One of the most significant benefits that come along with servo voltage regulators is world-class safety. Also, voltage fluctuations can cause overheating of the equipment. A servo stabilizer can remove voltage instabilities. Hence, you can use them and improve the lifespan of the equipment. On top of that, you will get them to consume the limited power provided to the devices.as well.

Servo stabilizer price.

You don’t have to spend a fortune to purchase servo voltage stabilizers. They are offering a convenient and cost-effective method to save your electric equipment. Even the amount you spend on servo stabilizers will be a great investment you can make in the future. If you compare its cost with an Uninterruptible Power Supply (UPS), it is always economical to use regulators to solve the issue due to voltage variation.

Avoids accidents.

Servo stabilizers can also help you to minimize the risk associated with power-related accidents, which can happen during short circuits and overloads. It will help you to keep your employees away from accidents that can take place at the property. Due to overheating of machines and electrical wires, there is always a chance of fire. Voltage regulators can help to avoid such mishaps by regulating voltages.

Reliability with low maintenance.

These voltage stabilizers contain the latest advances in technology. As a result, you can expect to receive the best level of reliability, efficiency, and quality. Once you get servo motor-controlled voltage stabilizers, you don’t have to spend a lot of time and effort on maintenance. It will help you to continue using these stabilizers without encountering any headaches. You have all the freedom to customize servo stabilizers as per your needs. In other words, you can customize the servo regulator based on your voltage needs and installation mode. In short, you can get servo motor stabilizers in different capacities, sizes, and types, as per your needs.

Components of servo voltage stabilizer.

When you take a detailed look at an automatic voltage stabilizer, you will notice its numerous components. Let’s understand what those components are and their functions.

Dimmer or variable transformer.

Dimmer is a transformer that comes in a rounded shape. No doubt, it is a crucial part of the servo stabilizer. This transformer has a silicon CRGO toroidal core. The number of turns in the core resembles its capacity.

The main objective of the dimmer is to raise or lower the voltage provided into the buck-boost transformer. The dimmer is responsible for increasing or decreasing the output voltage by 50%. The remaining will be from the buck-boost transformer.

Carbon brush.

Carbon brush is a moving component that you can discover within the servo stabilizer. It connects to the shaft and comes into contact with the dimmer. In case if the input voltage is frequently changing, the carbon brush will easily erase. As a result, people who use servo regulators will need to replace them too often. That’s why it is important to purchase a high-quality voltage stabilizer, which comes with a high-quality carbon brush.

Buck-boost transformer.

Buck-boost transformer is a rectangular-shaped transformer. It has an EL CRGO core. You will see this transformer within a varnish tank, which provides additional protection to it. In fact, varnish improves the coil life of the transformer while protecting the windings from damages caused by environmental exposure.

MCB, MCCB, & contractor.

MCB is responsible for switching on and switching off the servo stabilizer. On the other hand, it can provide short circuit protection. Likewise, MCCB delivers overload protection. In case if the voltage stabilizer exceeds recommended limit, the contractor comes into play. It will cut off the output in such a situation.

Electronic circuit.

The electronic circuit is responsible for sending signals to numerous components of the servo stabilizer, such as the dimmer and motor. It ensures that the voltage regulator works as per the signal and corrects the voltage accordingly.

How servo stabilizer works?

Inside a servo stabilizer, you can see a servo motor control mechanism. This servo motor is responsible for providing voltage correction. It has a closed-loop control system. Hence, you can use a servo motor stabilizer to ensure high output voltage accuracy. In other words, they can support voltage changes by 50% with an accuracy of 1%.

Inside a servo regulator, you will notice how one end of the buck-boost transformer is connected with the fixed tap of automatic transfer. The other end is connected with the moving arm, which controls the servo motor. The secondary buck-boost transformer connects to the incoming power supply, which represents the stabilizer output.

An electronic circuit within the servo stabilizer can figure out a dip or rise in supplied voltage. It detects this change in input voltage by comparing it with the in-built reference voltage source. Once the circuit finder locates an error, it would operate the motor in a way so that it moves the arm of the auto transformer. It can effectively feed the primary buck-boost transformer so that the voltage going through the secondary buck-boost transformer would be corresponding to the desired output.

Types of servo voltage stabilizers.

In most servo voltage stabilizers you can find out there in the market, you can find an in-built processor or microcontroller. This delivers intelligent control to the servo stabilizer and makes it offer a precise output. You can classify the available servo stabilizers into multiple categories as well. Here’s an overview of those categories.

Single phase-type servo stabilizer.

In a single-phase type servo stabilizers, you will notice how the servo motor is coupled with a variable transformer to deliver voltage correction.

Three phase servo motor stabilizer.

In a three phase balanced type servo voltage stabilizer, you will notice how the servo motor is connected with three automatic transformers. This ensures that the stabilized output is adjusted according to the output of transformers during fluctuations.

Three phase unbalanced servo regulator.

In a 3 phase unbalanced type servo stabilizer, you will notice how three independent servo motors are paired with three different auto transformers. Moreover, they have three control circuits as well.

Benefits of servo over static stabilizers.

The servo mechanism you can find in a servo stabilizer is more reliable than the way how a static stabilizer works. It will provide you the opportunity to keep peace of mind as you use a servo stabilizer. On top of that, you can expect to receive better protection as well. The presence of additional components such as MCCB and MCB are the reasons for it.

Benefits of servo type over relay stabilizers.

When you compare servo stabilizers with relay stabilizers, you will notice how they offer a higher correction speed. You can also expect the servo stabilizers to deliver a high precision stabilized output. The servo stabilizers are highly reliable, and they can withstand inrush currents effectively. If you are impressed by these benefits, you can go for servo stabilizers instead of relay type voltage stabilizers.

FAQs regarding servo voltage stabilizer.

A servo voltage stabilizer is a device that can correct voltage fluctuation and delivers stable voltages with the help of a servo motor-controlled mechanism. For voltage correction, windings of autotransformers need to increase or decrease to change the primary voltage of the buck-boost transformer. A moving arm with a carbon brush touching the autotransformer winding rotates with the help of a servo motor. Thus, it is referred to as a servo motor controlled stabilizer.

Please note following cons of a servo motor controlled system.

  • Servo stabilizers need regulator maintenance.
  • Due to the rotating carbon brush, it produces noise during working.
  • Voltage correction speed is slow.
  • Output voltages are with the regulation of 2%.
  • It is heavy.
  • These units with automatic bypass are costly.
  1. It should have a wider input voltage correction range.
  2. It should have a wider input voltage correction range.
  3. The unit should have an overload capacity of at least 150% for 1 minute.
  4. Servo voltage stabilizer should have protection against overvoltage, overcurrent, and short circuits.
  5. If the unit is going to be installed in a hilly area, it should have surge protection.
  6. It should have independent phase control.
  7.  It should have a user-friendly LCD control panel to change the required parameters. 
  1. First of all, calculate the total load. For this, list down single and three-phase load and calculate kVA by using current and voltages.
  2. Find out the voltage fluctuation range at your place. It is nothing but the lowest and highest voltage value. This will help to determine the input voltage range of the servo voltage stabilizer.
  3. If the total load is more than 20KVA, then better to go for a three-phase unit than a single phase.
  4. Shortlist at least three suppliers based on their experience and service setup. Negotiate to get the better price and warranty terms.

Servo voltage stabilizer prices depend on their KVA rating, input voltage range, and protection standards, and its cost increases with an increase in any one or all of these three factors. A higher kVA rating unit with a wider input voltage range will cost more. Similarly, if the system has protections like surge suppressor, input breaker, short circuit protection, the user needs to pay extra. The small 1 KVA unit will cost around AED 350, while 10kVA will cost approximately AED 2450.

Based on the output phases, servo stabilizers can be of single and three-phase types. Also, there are units available with three-phase input and single-phase output. If the requirement is more than 20kVA, it is recommended to install a three-phase unit.

A servo unit typically consists of the following components:

  • Buck and Boost transformer.
  • Dimmer or autotransformer.
  • Servo motor control mechanism.
  • Carbon brush
  • Contractor.
  • Electronic cards and LCD control panel.
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CtrlTech is a Leading voltage stabilizer manufacture with a client base all across the Middle Eastern countries. Cutting edge servo and static voltage regulators for every application. Contact us for a free site study.

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Control Technologies (FZE)

PO Box 122271, SAIF Zone,
Sharjah, UAE.

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