Skip to content
Home » The Construction of a Servo Motor

The Construction of a Servo Motor

Here’s a look at the operation of a Servo Motor. Its strengths, weaknesses and potential applications.
For any electro-mechanical job, it is vital to choose an electric motor. When precision is required, we often think of the servomotor. We’ll be talking about servomotor basics, advantages, disadvantages and applications in this article.

We will also discover why they are an essential device in robotics and industries that require precise movements.

A servomotor can either be a rotary or linear actuator. It is capable of precise control over angular or linear position, velocity, acceleration and other parameters. It includes a suitable motor, coupled with a sensor to provide position feedback. A controller with advanced capabilities is required. Often, a special module is required to use servomotors.

It is an electric device which can move an object or turn it with great precision. The servomotor can be used to rotate objects at certain angles or distances. It is simply a simple motor, which runs through servo system.

If the motor uses DC power as its source, then it is a DC-servo motor. If the motor draws power from AC, it will be an AC servomotor. It is possible to get a high torque servomotor in very small and lightweight packages. You can use them in many applications including robotics, machines and RC helicopters.

Did you know? Servo motor power cable can be bought from ZGSM Wire Harness…

Construction of Servo Motor

This motor uses positional feedback to control either the linear or rotational speed, and also position.

This motor actually is a combination of four things.

Normal DC motor- This is the one that generates the motion via its shaft.
Gear reduction unit/gear box
Control circuit

The DC motor is connected to the gear mechanism, which provides feedback on a position sensor that is most often a potentiometer.

It is connected directly to the central shaft. This informs you at all time the angle at which the motor shaft is available

The output of a motor is provided via servo-spline from the gearbox to the arm. The gearbox is composed of gears, which can increase or decrease speed or torque.

The standard motor uses the plastic whereas the high-power motor uses the steel gear.

A control circuit can control the motor’s motion via electric pulses.

Three wires form the motor. The black wire is connected to ground. A white/yellow cable is connected to the control module. Also, a red cable connected to the power supply.
Advantages of Servo Motor

A driver who places a significant load on the motor’s motor will increase the current to its coil in order to try to rotate it. There is no such thing as an out-of step condition.
High-speed operation may be possible.

Disadvantages of Servo Motor

Although the motor attempts to rotate according the command pulses, it lags behind. It is not suitable for precise control of rotation.
Higher prices
The motor’s rotational speed is one pulse per second after it has been stopped. This is why it is not suitable for vibration prevention.

Applications of Servo Motor

It is useful in applications that demand rapid speeds without overheating the motor.

They are found in various industries like packaging, machine tools, factory automation, material handling, printing conversion, and assembly lines. For many other critical applications, robots, CNC machinery and automated manufacturing are essential.
Uses radio controlled planes to control the movement of elevators.
They are used in robots for their smooth switching on/off, and accurate positioning.
The aerospace industry uses hydraulic fluid to maintain hydraulic system.
It is used in many radio-controlled toys.
It is used to replay or extend disc trays in electronic devices such a DVD player or Blue ray Disc player.
Use in automobiles for maintaining vehicle speed

What are the Different Types Of Servo Motors?

A servomotor, also known as a variable speed drive, is used in many industries such as industrial production, process automation, and building technology. They are specifically designed to be used for motion control applications that require fast reversing, excellent performance, and high accuracy positioning. This blog will explain the differences between servo motors for different applications.
What is a Servo Motor and How Does It Work?

A rotary actuator or linear motor is the servomotor. It allows precise control over angular or linear position, velocity, acceleration and other parameters. It includes a motor that is suitable for positioning feedback and a sensor. The controller is highly sophisticated. The working principle for the servo motor as well as the electromagnetic motor is similar, but the structure and the function differ. The standard motor uses a plastic gear while high power servos use a metal one.

Due to the development of the microprocessor and power transistor, these wires are suitable in many applications. they have three wires, power, ground and control. These motors are versatile because of their small size and streamlined appearance. The RC-servo motor, the most popular servo motor, is used mostly in hobby applications. This motor has simplicity, reliability, and affordability.

There are two types of this motor, based on the source used to power it. They are AC and DC servomotors.

Let’s briefly describe the different types of motors.

1. AC Servo Motor

An encoder is included in an ac servomotor. The encoder gives feedback to the controller and allows for closed-loop control. These motors feature superior designs to produce more torque. The AC servomotor can be used in many applications, including robotics, automation, and CNC equipment.

Positional rotation servomotor

A positional motor’s output shaft rotates with 180 degrees. This motor mostly includes physical stops. These are located in the gear mechanisms to stop the motor from rotating outside. The positional servo motor is used for robots, planes, toys, controlled cars, and many other applications.

Continuous rotation servo motor

The common positional servomotor has a continuous rotation servomotor. But it can also go in any direction at will. The control signal, which does not set the static position for the servo is actually understood to be the speed or direction of rotation. You can send a variety of commands to cause the servo clockwise and anticlockwise. The command signal will cause the servo to alter its speed. This type motor is used on a radar dish, if you’re riding a robot with it. You can also use it as a driver motor on a mobile bot.

Linear Servo motor

Linear rotation servomotor is similar to a positional servomotor. It is equipped with additional gears. With these extra gears, the o/p can be changed from circular to backward-and-forth. These servomotors aren’t easy to find. However, they can sometimes be found at hobby shops.

2. DC Servo Motor

The DC servomotor usually includes a DC source separate from the field of the armour winding. The motor can be controlled using either the field or the armature voltage. Both the field control and armature controls have advantages. This motor provides a quick and precise response to the start/end command signals due to its small armature-inductive reactance. They are compatible with many devices and other numerically controlled equipment.

Series servomotor

The series servomotors offer high starting torque as they draw huge current. The motor has very little speed regulation. Split series field winding can be used to overturn the field voltage pole.

Split-series servomotor

Split series motors may be used to operate as an individual energized field controlled motor. The motor armature supplies the motor with a stable current source. This motor exhibits a common curve with the torque speed. This is a common curve that indicates high stall torque, and a rapid fall in torque by increasing speed.

Motor for the Shunt Control

The shunt drive motor has two windings, such as armature winds and field windings. The stator houses the fields windings while the armature is located on its rotor. In a DC Shunt Motor, the windings cross the DC source parallel.

Permanent Magnet Shunt Motor

It can be used in any location where a stable magnetic field supplies the field. The motor performance can be compared to an armature control permanent field motor.

This is the complete list of types and uses for servo motors. This motor is one of the many types of servomechanism. They often pair with an encoder which provides speed feedback, position, and/or fault correcting, as well to activate the supply signal.