What is mean by magnetic encoder and its principle work?

The magnetic encoder is known to be the type of rotary encoder that sensors use to identify the changes in the magnetic fields from the wheel or ring. It is used to detect the rotational position that changes in the magnetic field, and the result will convert into an electrical signal and then outputs. The magnetic encoder is used in the application in the robust against the environment. This article goes on to discuss the How does a magnetic encoder work? In the beginning, it is used in the market as by the optical encoders. This is why accuracy and resolution that are improved hallow by shaft can be supported.

Thus, the simplest magnetic encoder consists permanent magnet and a magnetic sensor. The permanent magnetic encoder is attached to the tip of the rotating body in the motor shaft. In addition, the magnetic sensor is attached to the PCB board, where it may receive a magnetic field generator as by the permanent magnet. At the same time, the permanent magnet attached to the motor, a shaft that rotates the direction of the magnetic field detected by the magnetic sensor, changes. Then the result detects the position of the rotation and the motor shaft. 

Working process of the magnetic encoder:

How does a magnetic encoder work? The magnetic encoders have three main components: disk, sensor, and circuit. Thus, the disk is magnetized and with a more number of poles among its places. Thus, the disk rotates the changes in the magnetic field, and then information is converted into the sine wave. Of course, the sensor is a Hall Effect device, which senses a change in voltage that senses a difference in the magnetic field.

The conditioning circuits are divided, multiples and interpolate the sense as a signal to give the desired output. Its resolution is determined by the magnetic poles near the disk, in addition to the number of sensors. Thus, the incremental encoder ensures the quadrate output and then employs the X1, X2 or X4 encoding for the further increased resolution. Of course, the main difference between the incremental and absolute encoder concerning the sensing technology is that it will be the definitive version of the unique binary code or word for each measuring position. It may allow them to track the encoder’s exact status even if the power is interrupted. 

What is it used for?

It is designed to output in a digital manner in the most demanding application environments. This is excelling in the application, and it may need broad temperature specification, vibrancy resistance and big shock and robust sealing and contaminant protection when providing the output signal. The widespread application includes the position and velocity feedback in pulp, paper, steel and lumber mills. 

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