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What is Servo Motor and How does it Work?

Servo motors have been around for quite some time and they are used in various industries. When you see it, you might think that it is impossible for it to provide power, however, they might be small in size, but they are loaded with a lot of power and they are quite energy-efficient. These characteristics allow them to be used in radio or remote-controlled robots, toy cars, and airplanes. These motors are used in robotics, industrial applications, food services, and pharmaceuticals. However, how do these small motor work?

The motor’s circuitry is built inside the motor unit and it has an adjustable shaft, which is placed with a gear. Then, the motor is connected to an electrical signal that will be determined by the movement of the shaft.

What is inside the servo motor?

In order to fully understand how these parts work, you will need to take a look under its hood. Inside, you will find a simple setup made from a small DC motor, a control circuit, and a potentiometer. The motor is attached by the gears that actually control the wheel. As the motor move and rotates, the potentiometer resistance charges, hence the control circuit controls and regulates how much movement there is and in which direction.


When the shaft is at the desired position, the power that is supplied to the motor stops. In it is not, the motor gets turned into the right direction. Then, the position is sent by electrical pulses via the signal wire. The speed of the motor is proportional to the difference between the position and the desired position. Hence, if the motor is close to its desired position, it will turn slowly, if not, it will turn fast. This is called proportional control. What this means is that the motor will run as hard as needed to accomplish the task.

The types of Servo Motors

There are two types, the AC and DC. AC servo motors can sustain a higher current surge and they tend to be used in industrial machinery. DC servo motors are not made to sustain higher current surges and are usually suitable for smaller applications and machines. According to the experts from, these servo motors are built for continuous rotation, making it easier to get a robot or other things moving.

Servo Motor Applications

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These motors are used in radio-controlled airplanes in order to control surfaces like rudders, elevators, operating grippers, or moving robots. In food industries and pharmaceutical industries, these motors are used in harsh environments where there is a chance for corrosion. They are used in in-line manufacturing, where repetition, yet precise work is needed.


As you can see, these servo motors have various uses and they can be implemented in various industries and fields. They are small, but they have a lot of power in them, hence, do not waste any more time and start searching for the perfect servo motor for your projects and work.

Peter is a freelance writer with more than eight years of experience covering topics in politics. He was one of the guys that were here when the started.