The Encoder: An Essential Component of a Servo Motor

Deval Shah
Deval Shah

In the field of robotics, servo motors are highly regarded for several wonderful reasons. They offer the best solution to motion and positioning control in instances where accuracy and precision are highly needed. Like every other device, servos are composed of different parts.
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One of the most important parts in any servo is the encoder. When a servo motor has the right encoder, it will perform the highly precise operations very well. In this post, we are going to talk about the encoder and how it helps to make the servo motor perform as required.

The Basics of the Encoder

The first thing to know about the encoder is that it is the sensor that notifies the driver of the speed and position of the motor. They are sometimes referred to as position detectors.
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It is that part of the servo that relates positional and speed information to the controller of the servo. It can be illustrated as the mediator between the intelligence and the muscle of the servo motor – it makes sure that the different parts of the motor work in sync.

Without the encoders in a servo motor, the level of accuracy and precision recorded with them will be impossible. By integrating them in the servo mechanism, it is easier to obtain all the impressive features including high efficiency, small size, and high torque technology. They are literally a major part of the reasons servo motors are driving us into the future of robotics.

Types of Encoder

The encoders found in servo motors can be structurally classified into two: absolute encoders and incremental encoders. It is important that we look at these different types of encoders to give you a better idea of how a top quality servo performs excellently in a robot.

  • Absolute Encoders

These are the types of encoders that return non-relative angle values referenced to a fixed zero point. This means that the encoders can output the absolute position of the rotation angle, and it is capable of achieving it within one rotation of the servo motor.
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  • Incremental Encoders

These are the types of encoders that output the pulse with respect to the change portion of the rotation angle. They are involved in the measurement of shift relative to a previously measured value. They are capable of detecting the rotation, speed, and direction of the servo motor at any given time.

Choice of servo encoders

The different types of encoders have their benefits and shortcomings. Absolute rotary encoders are used in many top quality servos like the RDrive servos. They are considered more accurate and reliable than incremental encoders. It is not every time, however, that these encoders are preferred in a servo. They are generally more complex, a little more expensive, and have few other limitations. They are recommended in instances where the benefits they will offer outweigh their limitations.

Servo motors are helping many people build top quality robots. They are also applicable in other fields like factory automation and related precision control operations. It is important to invest in top quality servos for any project. Generally,  to implement the presize operation top quality servos are the must. This is an important thing to know for everyone interested in robots.

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