What is an ENCODER - Linear and Rotary encoder - Incremental and Absolute encoder

[Music] what is an encoder an encoder is a communication device that controls the motion of an operating device encoders are used to translate rotary or linear motion into a digital signal helping to determine the speed or position of a motor or other moving equipment basically an encoder acts as a measuring system for moving parts there are two different types of encoders linear and rotary a linear encoder respond to motion along a path while a rotary encoder responds to rotational motion Within These two categories we can list different encoder measurements types such as absolute encoders which are capable of providing unique position values from the moment they are switched on an incremental encoders that instead generate an output signal each time the the shaft rotates a certain amount encoder also differ in electromechanical Technologies such as Optical magnetic inductive capacitive and laser in this video we will focus on the most popular encoder technology the optical encoder we will see different types of optical encoders and their applications let's start from the linear encoder which is basically a transducer paired with a scale that encodes position the transducer reads the scale in order to convert the encoded position into a digital or analog signal which can then be decoded into position by a motion controller it is normally used for linear measurements in order to detect the trans trans ational motion of an object these encoders in fact can use a rod or a cable that is run between the encoders transducer and the object that will be measured for movement let's move on to the rotary encoder also known as shaft encoder unlike the linear encoder the rotary encoder collects data and provides feedback based on the rotation of an object or in other words a rotating device since it converts the angular position or motion of his shaft to analog or digital output signals basically both linear and rotary encoders do the same thing they produce an electrical signal when this signal is properly processed by the electronic circuits it produces analog or digital output signals which are translated into angular movements linear and rotational motion as well as in rotation speed and accelerations more than 10 years in industrial supplies have led ja to become a qualified partner for some of the most important Industrial Automation companies offering a wide range of different encoders types as we have said before both linear and rotary encoders can perform absolute or incremental measurements absolute rotary encoders can measure angular positions while incremental encoders can measure things such as distance speed and position here an example of absolute Brut encoder we can see inside that a sloted disc on a shaft is used in conjunction with a stationary pickup device when the shaft rotates the disc is rotated in a beam of light such as an LED and the markings on the dis access shutters blocking and unblocking the light thanks to this a unique code pattern is produced this means that each position of the shaft has a pattern and this pattern is used to determine the exact position position if the power to the encoder was lost and the shaft was rotated when power is resumed the encoder will record the absolute position as demonstrated by the unique pattern transmitt by the disc and received by the pickup device absolute measurement encoders can be single turn or multi- turn single turn absolute encoders are used for measurements of short distance while multi turn absolute encoders would be more suitable for longer distances or more complex positioning requirements incremental rotary encoders create an output signal every time that the shaft rotates a certain amount this output signal is then interpreted based on the number of signals per Revolution this encoder begins its count at zero when powered on so there are no safeguards regarding the position that's because unlike the absolute encoder the incremental encoder begins its count at zero in startup or power disruption for this reason it is necessary to determine a reference point for all tasks requiring positioning the most common type of incremental encoder uses two output channels A and B to sense position and direction of rotation using two code tracks with sectors positioned 90° out of phase the two output channels of the encoder indicate both position and direction of rotation if a leads B for example the disc is rotating in a clockwise direction if B leads a then the dis is rotating in a counterclockwise Direction some types of incremental encoders when integrated communication signals are normally used as motor feedback these additional signals simulate the whole phases which are usually employed in brushless motor as you can see in our previous video linear encoders on the other end can be used inside a m machine in order to obtain direct control over the exact position of the material we can find encoders in many robotic devices for multi-axis synchronization control but also we can find them in common printers absolute encoders can be used inside the pitch control system of wi turbines allowing the blades angle to be adjusted according to wind speed an absolute encoder is often the preferred solution when the device is inactive for a long period of time or moves at a very slow rate such as flute gate control due to their many advantages Optical encoders are used in many industrial sectors specifically where High Precision is most needed like in the healthc care sector where this type of encoder can be used for precision medical equipment if you found this video useful please let us know by leaving a like and a comment you can also share it and don't forget to subscribe to our YouTube channel find out our next project by visiting ja company.com [Music]

Channel: JAES Company

Views: 116,962

Keywords: JAES, jaescompany, encoder how it works, incremental encoder explained, absolute encoder explained, rotary encoders how it works, linear encoder how it works, optical encoder wxplanation, laser encoder, inductive encoder, capacitive encoder, magnetic encoder, What is the Difference between Absolute and Incremental Encoders, encoder arduino, encoder for robots, encoder for cnc machines, encoder hall phases, encoder wind turbines, rotary encoder, absolute encoder

Id: nnk0DV5kgMk

Length: 7min 31sec (451 seconds)

Published: Fri Feb 14 2020