Thanks for the compliment and the suggestion, Jay! I will surely pass this on to our creator team. We do go into more depth in our course library bit.ly/30AVJaR Feel free to have a scroll through our courses, I'm sure it's of your interest. Happy learning!
As a Automation engineer, this channel is absolutely marvelous! Do not stop producing amazing content! p.s. looking forward for a video about OPC UA :)
At work I wrote some software to use an incremental quadrature encoder to characterize the output of an absolute position magnetic encoder. Interesting to see how the particular placement of the magnet affects the absolute position encoder’s output
Incremental are best in unpredictable motion/speed, long ways or/and high speed. Absolute in saw cutting machine, bending machine(the hidraulic piston), treading, drilling, or any repetitive work being mechanism or short(70cm) robotic arm with only one hemisphere of movement like human hand for safety reasons replacing workers at handpackaging cookies, wafers, bread, small packs in big one's, bags, lightbulbs, clocks, glasses, unpackaged items, cups, plates, saucepans, wine, handling freshly pressurized champagne wich sometimes explodes and injures the worker's hands.
I think there is a mistake in this video. Please correct me if I am wrong. A CNC milling machine would typically use a rotary encoder located inside the stepper motors. A linear encoder is typically used in a digital readout (DRO) on a manual milling machine.
The use of linear or rotary encoders depends on the application, not on the "class" of the machine. in the video. a linear encoder is used with a CNC milling machine where the part is moved back and forth in a linear direction. If the machine were a CNC lathe, then a rotary type encoder would be used.
Nah bro, So basically, the servo motor needs a rotary encoder to feedback to the drive by default. A rotary encoder cannot see lost motion, such as backlash, but a linear encoder can, as it moves linearly along the axe. A linear encoder on a cnc machine is only there in order to achieve greater accuracy. With a stepper motor it is completely different to an ac servo, it doesn't require a rotary encoder, however you can add both a rotary and a linear encoder if you wish to achieve true closed loop control.
Desde Colombia. la forma como explican cada tema es muy clara. me gusta mucho su calidad de multimedia. pareciera que tuviéramos los elementos en nuestras mismas manos.
For a three-bit absolute encoder, as shown in the example, the minimum measurement magnitude would be 1/8 of a full rotation (45 degrees). If they're so precise, how do they encode smaller increments? Or are their bit depth larger in real life?
A very resolute absolute encoder has 12 or more "tracks" which gives the device 12-bit resolution (1 bit per track). 2^12 = 4096 divisions/revolution. This level of resolution is provided optically by detecting light pulses produced by very small photodiodes, a precise mask disk and an LED light source. Up to 10,000 increment per revolution are now possible.
Hey. Thank you for a great explanation. I do not have much knowledge about sensors, and I m looking for some type of sensor for my project. My question is; we will drill using earth auger, and we want to count the rotation number. As I understood, I cannot use these types of encoders because I need to connect to the drill bit, and it completely will rotate, so I cannot connect these encoders to the bit and the drill itself. Should I search for magnetic encoders working with rings? In this way, I can place the magnetic ring on the rotational part, and I can count the rotation with an encoder that is close to the ring? Am I right? Thanks!
Thank you for your question. You have an interesting issue. If you're counting the rotation of a drill when it completes 360 degrees, you can use any electrical sensor that detects a marker on the rotating part, like the drill chuck or any other part that turns 360 degrees. You'll need to send this signal to a controller to utilize this rotational motion as needed. Happy learning!
I did not get it, can anyone can explain please. 5:39 how 111 code can precisely determine the degree. Since the video shows that 111 code is somewhere between 315 to 360 degrees. Or it is a mechanical counter like miles counter in an old car? In that case why do we need that laser system after all. Thanks.
The video shows a simplified version of an optical slotted disk absolute encoder with 3 bits of resolution. That is equivalent to 45 degrees. Actual encoders can have up to 28 independent light paths. 28-bit accuracy is equivalent to a resolution of 0.00000134 degrees. That would be a little tough to show in the video, so it was simplified to demonstrate the principle.
What software do you use to make these awesome animated examples. I would like to use it to make quick project sample views for project meetings. Thanks!
Hi Jeremy, Thanks for your comment! Happy to hear that you like our animations! To be honest, I am not sure about this as this is done by our graphic and animation department.
I don't quite understand the absolute rotary encoder. For example , the disk start from 0 degree and it's 000 binary , for it to rotate until 001, it needs 360/8(binary digits/different pattern) = 45 degree, how can it knows where is the disk ? is it 23 deg ? is it 40 deg ? because the binary is still 000 , the pattern doesn't change
For an absolute encoder, as the encoder disk turns, the "pattern" that is sensed is unique for every position that can be sensed. The encoder in the video is only a 3-bit encoder, capable of detecting changes of 360/8 or 45 -degrees. So you are correct: between 0 and 45 degrees, the pattern does not change. However, an actual encoder, say a 15-bit encoder, is able to discern 360/32768 or 0.011 degrees of rotation. Each increment has a unique pattern, so the encoder always knows where it is relative to the 0-degree, or home position.
But how does the absolute encoder know the exact position? In the example that starts at 5:20 when the code is 011 it could be 150° or 170° or anything in between
My best guess is they can increase the number of bits (slots on the disk)... The example here was a 3 bit encoder... You may use 4 or even more bits to make it more precise of the angles?
Kelmat is correct. The video shows a simplified example. With an absolute encoder, there is a distinct bit pattern for every position, so that the position can precisely be known. Many absolute encoders utilize multiple disks for position determination and many are able to determine absolute position over up to 4096 increments/turn.
I knew something didn't 'add up' with the binary code and the degrees so I thought it may have been a simplified example. Then I confirmed by looking it up (en.wikipedia.org/wiki/Rotary_encoder) and sure enough, an interruptor disc with many more slots is listed in the picture above. If you ask me, there is something hypnotic about the arrangement of these slots in a rotational pattern. But anyhow, I scroll down here to see if anyone had the same question and here I am!
for absolute encoding, this article might be interesting: en.m.wikipedia.org/wiki/Gray_code by the way: when code is on a wheel, make sure it doesn't slip due to obstruction so a reset position might be s good idea ... on the other hand: using a stepper motor might be as good as the incremental measuring as long as rotation of the axis is not obstructed.
Thank you for your comment, Tomas! Regarding your question, I am actually not sure about that, as our animations are all created by our Graphic and Animation department.
which software did you use for creating these videos. I really appreciate you have put a lot of effort into creating these videos, I wanted to create them in a similar fashion for my class seminars as well.
Hi there, Thanks for your kind comment, we appreciate such support! I am actually not sure about this as this is done by our Graphic and Animation department. Sorry about that!
Hey! Thanks for your comment, happy to hear that you are enjoying our content! I am actually not sure about this as this is done by our graphic and animation department.
No, the encoder position is always a positive number. If you want to establish a zero-reference and track position by + (clockwise) or - (c0unter-clockwise) from that reference, you could do that by keeping a separate integer variable that you can program with a value that increments up or down based on encoder position. That is a lot of work, and i find using the encoder's raw position value to be the best to use.
Hi Andrew, Thank you for your question. The inclusion of the feature you mentioned in the encoder's electronics could vary based on the manufacturer and its intended use. To gain accurate information, I recommend consulting the operator's and data manual specific to your encoder. Wishing you a fruitful learning experience with RealPars!
Not exactly. The index for an incremental encoder generates a pulse which allows the encoder to "home", such that an accurate "count" of position from the "home" position can be made. In an absolute encoder, each position has a unique pattern. The index pulse of an incremental encoder only provides a reference location given once for each revolution.
If the incremental and absolute encoders have the same reference (zero) position, they should both give the same result provided they both have the same resolution. In practice, that does not happen. The incremental encoder has a zero position wherever the position is when the encoder is powered on. It simply indicates how many turns the shaft has made since it was first enabled. So while it is possible to approximate the action of an absolute encoder with an incremental encoder, this is not often done because there would need to be another function required to position the shaft to a precise zero position.
@@realpars By integrating a microprocessor and an external battery I designed a system that ensures that the incremental encoder position is kept in memory continuously. I converted it into a thesis and my thesis was accepted.
The PLC represented in the video is a Siemens S7-1500 series PLC. The lower-cost S7-1200 can be used to program all of the same examples shown in our videos as well.
Hi there, Thanks for your comment! That would make for a great future video course! I have gone ahead and passed this on to our course developers as a topic suggestion. Thanks for sharing and happy learning!
Hi Yahai, Thanks for your comment! I will pass this on to our course developers as a topic suggestion. This would make for a great future course video. Happy learning!
So let's use the typical 1024 pulse per revolution shaft mounted encoder. That means each revolution of the motor send 1024 pulses to the motor controller, typically some kind of VFD or PLC which in turn controls the motor controller. Most applications are geared so that means we must take account the gear ratios between the motor and load. Let assume we are a 1:1 ratio and we are controlling rotational position scaled to units of degrees. It depends on the software used but in siemens motion control, you scale the units and define as rotational motion. This sets the units you use when setting acceleration or deceleration as degrees/sec/sec and position in degrees. You define the position of the movement in length units. Let's assume for simplicity we define 3600 length units per revolution of the motor, that means when I command the motor to move 3600 length units it will move the motor one revolution at whatever accelerating I defined. What the motor does depends on what type of movement you have chosen. There are several types of movements, ranging from absolute, relative, synchronization position and speed movements, gear in movements and other more complex movements. A simple position movement will be defined as either relative or absolute. A relative movement will move whatever length units you defined from its current position. An absolute move will move to that specific position. So let's say, our position is 3600 LU and we move relatively 10000 LU, the motor will move until the position is 13600 LU. An absolute move would have put the motor position at 10000 LU. So to sum up, motion control is counting the encoder pulses from the motor and correlating that to some rotational or linear travel through defining this in meaningful units and issuing commands to the drive based on these units.
Thank you for your question. I have provided two links to help you learn more about encoders. www.encoder.com/article-what-is-an-encoder#:~:text=Simply%20put%2C%20an%20encoder%20is,count%2C%20speed%2C%20or%20direction. ruclips.net/video/k2GQVJ4z0kM/видео.html Happy learning from REALPARS!
No. This would require changing out the device. The incremental and absolute encoder signals are very different in the way the position is determined. Absolute encoders use multiple light paths to determine an absolute position whereas an incremental encoder has one light signal that pulses each time a fractional movement of the rotating disk is detected.
An absolute encoder is designed such that the optical path through the encoder at any time indicates the absolute position of the encoder wheel, between 0 and 360 degrees rotation. An absolute encoder maintains its position information when power is removed from the encoder. An incremental encoder gives only a change in position from one measurement time period to the next. An incremental encoder may need to be homed (moved to a fixed reference point) to initialize absolute position measurements.
False! The absolute definition cannot account for the position angles between output changes. The only thing it could do is assume position angle based on current input to the motor and last known RPM. What that design us doing is giving an output every 1/6 rotation it seems. However, if you were to add incremental pulses to the outter edge, you could know where the shaft is up to the resolution of the smallest gap between larger gaps. But if power is removed and restored it could only tell you which 1/6 its in and whether or not it is at an increment. But not which increment of that 1/6 it's at.
I really appreciate the video, content of video is quite enough to vive the idea of working of encoders. Can you please provide a video on "Heidenhain AK ERM 280" type encoders?
With an absolute encoder, there is a distinct bit pattern for every position, so that the position can precisely be known. Many absolute encoders utilize multiple disks for position determination and many are able to determine absolute position over up to 4096 increments/turn.
In a sense, you are correct. The bills are mechanically pulled through a microprocessor scanner one at a time, and based on how many times a beam of light is interrupted, the machine knows how many bills it pulled through. While this is technically not an incremental encoder, it works pretty much the same. As the bills go through the cash sorter, combinations of Ultraviolet (UV), Magnetic (MG), and Infrared (IR) are used for counterfeit detection and pattern recognition is used for detecting the denomination and orientation.
Hi there, We're glad you found RealPars videos useful; You can share our video as long as it remains unmodified, tagged and credited back to us. Unfortunately downloading our videos from RUclips or RealPars platform and translating them goes against RUclips and also RealPars copyright. Thanks for your understanding.
In a video i saw about my encoder , it did not require a power source. A womans hand turned the shaft and the led board lit up. I figured pretty simple setup. After receiving my encoder i hooked it to the led board and nothing happened. What am i missing ??? Im not an electronics wiz.
Thank you for your inquiry. In general, electronic devices necessitate power to facilitate the transmission and reception of information. This power can originate from an external source like a power supply or internal batteries. Some devices are even capable of generating their own power through rotation. For specific guidance on your encoder, I recommend reviewing the installation manual or reaching out to the vendor you obtained it from. Wishing you a productive learning experience with RealPars!
Yes, there are typically 2 "code tracks" that are slightly out of phase so that both position and direction can be detected. Some incremental encoders use two separate light sources (could be LED's, laser. etc) and two receivers to determine the position and direction of rotation.
I have a absolute type encoder which is gray code output may i replace it with Binary coded absolute encoder? If you know please help me Thanks in advance.
Yes. HOWEVER, gray code and binary are not the same number system, so you would need to modify your PLC code to replace the gray code to absolute position conversion with a binary code to absolute position conversion.
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I actually learn something of great value with every video of yours that I view! Thanks, RealPars!
That is amazing, Bob! Thanks a lot for sharing.
Another top quality video. I just wish you guys could go into more depth but I appreciate what you do put on here.
Thanks for the compliment and the suggestion, Jay!
I will surely pass this on to our creator team. We do go into more depth in our course library bit.ly/30AVJaR
Feel free to have a scroll through our courses, I'm sure it's of your interest.
Happy learning!
As a Automation engineer, this channel is absolutely marvelous! Do not stop producing amazing content! p.s. looking forward for a video about OPC UA :)
Thanks a million for your support, Paul! Great to hear that you are enjoying our course videos so much. Happy learning!
It's really a great continent 👏
Definitely one of the best promotional videos I've seen in a quite some time!
Glad you enjoyed it
Excellent Explanation and teachings on Encoders with how to use it in specific application,
Thanks to team RealPars--- A Indian-- Engineering Student
Glad it was helpful!
I really like the way you explain the components. It is clear to understand.😀
That is a great compliment, Djenny! Thanks for sharing that with us!
I really appreciate this content it has been of so much use to me.
That is amazing, Sheliza! Very happy to hear that!
No body can not explain like this.
... Clear explain ....👏👍
Thank you so much!
it's very clear, i get best understanding on Absolute and Incremental encoder
Great to hear!
Realpars is doing a great things to learn students
Glad to hear that, Karthik! Thanks for your support.
Greatest channel on RUclips
That's great to hear! Thanks for sharing and happy learning.
At work I wrote some software to use an incremental quadrature encoder to characterize the output of an absolute position magnetic encoder. Interesting to see how the particular placement of the magnet affects the absolute position encoder’s output
Great video explaining the difference between absolute and incremental! Thanks!
Glad you enjoyed it!
Incremental are best in unpredictable motion/speed, long ways or/and high speed. Absolute in saw cutting machine, bending machine(the hidraulic piston), treading, drilling, or any repetitive work being mechanism or short(70cm) robotic arm with only one hemisphere of movement like human hand for safety reasons replacing workers at handpackaging cookies, wafers, bread, small packs in big one's, bags, lightbulbs, clocks, glasses, unpackaged items, cups, plates, saucepans, wine, handling freshly pressurized champagne wich sometimes explodes and injures the worker's hands.
I don't know what this is but this is fascinating
I think there is a mistake in this video. Please correct me if I am wrong. A CNC milling machine would typically use a rotary encoder located inside the stepper motors. A linear encoder is typically used in a digital readout (DRO) on a manual milling machine.
The use of linear or rotary encoders depends on the application, not on the "class" of the machine. in the video. a linear encoder is used with a CNC milling machine where the part is moved back and forth in a linear direction. If the machine were a CNC lathe, then a rotary type encoder would be used.
Nah bro,
So basically, the servo motor needs a rotary encoder to feedback to the drive by default.
A rotary encoder cannot see lost motion, such as backlash, but a linear encoder can, as it moves linearly along the axe.
A linear encoder on a cnc machine is only there in order to achieve greater accuracy.
With a stepper motor it is completely different to an ac servo, it doesn't require a rotary encoder, however you can add both a rotary and a linear encoder if you wish to achieve true closed loop control.
High quality content to person like me as beginner plc programmer
RealPars You are the best. You explain very accessible. Good luck to you
Amazing to hear! Thanks for sharing.
For the first time i found a good explanation.thank you so much
Happy to hear that, Hamza! Feel free to reach out if you have any questions.
Excellent presentation. I used to work on systems that employed these devices.
Thank you, Juan!
U r welcomed.
Thank you Realpars for the video.
Our pleasure, Amit!
A brief video on the uses and functions of slip rings. Thank You.
Desde Colombia. la forma como explican cada tema es muy clara. me gusta mucho su calidad de multimedia. pareciera que tuviéramos los elementos en nuestras mismas manos.
Muchas gracias, Cristian!
Thanks for the great content. Yes, more detailed videos would surely be much appreciated!
You are very welcome! Thanks for your feedback!
Thank you for all you are doing for techs out in the field
You are very welcome, John! We appreciate your support!
Your channel is really helpful and easy to understand Thank you 😊
That is amazing to hear! Thanks for sharing.
Thank you Real pars👍👍👍
You're very welcome!
Wow...very clear explanation
Glad to hear that, Eko! Thanks for sharing
For a three-bit absolute encoder, as shown in the example, the minimum measurement magnitude would be 1/8 of a full rotation (45 degrees). If they're so precise, how do they encode smaller increments? Or are their bit depth larger in real life?
A very resolute absolute encoder has 12 or more "tracks" which gives the device 12-bit resolution (1 bit per track). 2^12 = 4096 divisions/revolution. This level of resolution is provided optically by detecting light pulses produced by very small photodiodes, a precise mask disk and an LED light source. Up to 10,000 increment per revolution are now possible.
great video quality and clear explanations!
Thanks for your support, Andrea!
I found this great and i will be waiting for more on electromechanics.Thanks.
That's great to hear, Bekir! Thanks a lot for sharing.
awesome explanation with visualization
Glad you liked it! Thank you for sharing
Really, all your videos are amazing, ❤❤❤❤❤
Glad you like them! Thank you very much for your support
Excellent explanation. Thanks 🙏🙏🙏🙏
Glad you liked it!
Thank you for clarification on transducers and encoders
You are very welcome! Happy learning!
Great explanation! I'm considering subscribing to your website so that I can learn more.
Awesome, thank you! Feel free to reach out if you have any questions about our course library or our subscriptions services.
Happy learning!
Hey. Thank you for a great explanation. I do not have much knowledge about sensors, and I m looking for some type of sensor for my project. My question is; we will drill using earth auger, and we want to count the rotation number. As I understood, I cannot use these types of encoders because I need to connect to the drill bit, and it completely will rotate, so I cannot connect these encoders to the bit and the drill itself. Should I search for magnetic encoders working with rings? In this way, I can place the magnetic ring on the rotational part, and I can count the rotation with an encoder that is close to the ring? Am I right?
Thanks!
Thank you for your question. You have an interesting issue. If you're counting the rotation of a drill when it completes 360 degrees, you can use any electrical sensor that detects a marker on the rotating part, like the drill chuck or any other part that turns 360 degrees. You'll need to send this signal to a controller to utilize this rotational motion as needed. Happy learning!
I did not get it, can anyone can explain please. 5:39 how 111 code can precisely determine the degree. Since the video shows that 111 code is somewhere between 315 to 360 degrees. Or it is a mechanical counter like miles counter in an old car? In that case why do we need that laser system after all. Thanks.
The video shows a simplified version of an optical slotted disk absolute encoder with 3 bits of resolution. That is equivalent to 45 degrees. Actual encoders can have up to 28 independent light paths. 28-bit accuracy is equivalent to a resolution of 0.00000134 degrees. That would be a little tough to show in the video, so it was simplified to demonstrate the principle.
Thank you RealPars !!!
You are very welcome, Emmanuel!
Excellent realpars thanks alot
You are very welcome, Tariq!
Awesome and happy new year sir
Thanks a lot, Siva!
The RealPars team wishes you a splendid new year as well!
What software do you use to make these awesome animated examples. I would like to use it to make quick project sample views for project meetings. Thanks!
Hi Jeremy,
Thanks for your comment! Happy to hear that you like our animations!
To be honest, I am not sure about this as this is done by our graphic and animation department.
I don't quite understand the absolute rotary encoder. For example , the disk start from 0 degree and it's 000 binary , for it to rotate until 001, it needs 360/8(binary digits/different pattern) = 45 degree, how can it knows where is the disk ? is it 23 deg ? is it 40 deg ? because the binary is still 000 , the pattern doesn't change
For an absolute encoder, as the encoder disk turns, the "pattern" that is sensed is unique for every position that can be sensed. The encoder in the video is only a 3-bit encoder, capable of detecting changes of 360/8 or 45 -degrees. So you are correct: between 0 and 45 degrees, the pattern does not change. However, an actual encoder, say a 15-bit encoder, is able to discern 360/32768 or 0.011 degrees of rotation. Each increment has a unique pattern, so the encoder always knows where it is relative to the 0-degree, or home position.
@@realpars Ah I see. So a x bit encoder use x led arrays to detect and 2^x different patterns?
Thank you very much for great explanation and very useful information.
Glad it was helpful!
But how does the absolute encoder know the exact position? In the example that starts at 5:20 when the code is 011 it could be 150° or 170° or anything in between
My best guess is they can increase the number of bits (slots on the disk)... The example here was a 3 bit encoder... You may use 4 or even more bits to make it more precise of the angles?
@@sagelioneldsouza8230 i see, so doing some calculations you need at least 9 bits to get a 360° precision
@@Kelmat_ yess :) Glad we figured it out🥂 Thanks
Kelmat is correct. The video shows a simplified example. With an absolute encoder, there is a distinct bit pattern for every position, so that the position can precisely be known. Many absolute encoders utilize multiple disks for position determination and many are able to determine absolute position over up to 4096 increments/turn.
I knew something didn't 'add up' with the binary code and the degrees so I thought it may have been a simplified example. Then I confirmed by looking it up (en.wikipedia.org/wiki/Rotary_encoder) and sure enough, an interruptor disc with many more slots is listed in the picture above. If you ask me, there is something hypnotic about the arrangement of these slots in a rotational pattern. But anyhow, I scroll down here to see if anyone had the same question and here I am!
for absolute encoding, this article might be interesting:
en.m.wikipedia.org/wiki/Gray_code
by the way: when code is on a wheel, make sure it doesn't slip due to obstruction so a reset position might be s good idea ...
on the other hand: using a stepper motor might be as good as the incremental measuring as long as rotation of the axis is not obstructed.
Thanks for adding that!
Excelent video! Great explanation! greetings from México!!
Thanks a lot, Zarek! Happy to hear that.
Which software do you use to draw/modelize that panel??
Thank you for your comment, Tomas! Regarding your question, I am actually not sure about that, as our animations are all created by our Graphic and Animation department.
Many thanks for your awesome videos. 👏👏Let's comment to support the channel. 👍
Thank you, Mehmet!
Nice video, please upload more part and technology of cnc machine
Thanks for your feedback and suggestion!
which software did you use for creating these videos. I really appreciate you have put a lot of effort into creating these videos, I wanted to create them in a similar fashion for my class seminars as well.
Hi there,
Thanks for your kind comment, we appreciate such support!
I am actually not sure about this as this is done by our Graphic and Animation department.
Sorry about that!
@@realpars oh thanks. Not a problem
Really helpful thank u sir👍
You're very welcome!
Thanks for giving wonderful knowledge
You are very welcome, Subham!
2021 watching thanks sir very helpful
Our pleasure, Bernard!
How does the incremental encoder know which direction it is moving/rotating?
It would only know by detection of the direction of rotation of the encoder drive shaft.
Love your videos. What software do you use to make your animations?
Hey!
Thanks for your comment, happy to hear that you are enjoying our content!
I am actually not sure about this as this is done by our graphic and animation department.
Absolutely great! Big up
Thank you! Happy learning!
Thank you very much sir 🙏😊
You're more than welcome!
Excellent video
Thank you!
Is there a way to preset a negative value?
No, the encoder position is always a positive number. If you want to establish a zero-reference and track position by + (clockwise) or - (c0unter-clockwise) from that reference, you could do that by keeping a separate integer variable that you can program with a value that increments up or down based on encoder position. That is a lot of work, and i find using the encoder's raw position value to be the best to use.
Thank you for sharing. Nice video!
You are very welcome! Happy learning!
Excellent explanations thank you
Thanks a lot, Vengatesan!
Very good video !
Thank you!
Thanks this is a very interesting matter
You are very welcome!
Do optical encoders require debounce filtering?
Hi Andrew,
Thank you for your question. The inclusion of the feature you mentioned in the encoder's electronics could vary based on the manufacturer and its intended use. To gain accurate information, I recommend consulting the operator's and data manual specific to your encoder.
Wishing you a fruitful learning experience with RealPars!
An incremental encoder can also have an index channel as well, so in that sense can it not also be an "absolute" encoder?
Not exactly. The index for an incremental encoder generates a pulse which allows the encoder to "home", such that an accurate "count" of position from the "home" position can be made. In an absolute encoder, each position has a unique pattern. The index pulse of an incremental encoder only provides a reference location given once for each revolution.
Is it possible to have a design that will allow the incremental encoder to act like an absolute encoder?
If the incremental and absolute encoders have the same reference (zero) position, they should both give the same result provided they both have the same resolution. In practice, that does not happen. The incremental encoder has a zero position wherever the position is when the encoder is powered on. It simply indicates how many turns the shaft has made since it was first enabled. So while it is possible to approximate the action of an absolute encoder with an incremental encoder, this is not often done because there would need to be another function required to position the shaft to a precise zero position.
@@realpars By integrating a microprocessor and an external battery
I designed a system that ensures that the incremental encoder position is kept in memory continuously. I converted it into a thesis and my thesis was accepted.
Very useful 🤝
Glad to hear that!
What kind of PLC your are using in the course?
The PLC represented in the video is a Siemens S7-1500 series PLC. The lower-cost S7-1200 can be used to program all of the same examples shown in our videos as well.
Can you please tell me how encoder works in hydraulic intensifier?
Hi there,
Thanks for your comment!
That would make for a great future video course! I have gone ahead and passed this on to our course developers as a topic suggestion.
Thanks for sharing and happy learning!
Excellent video.
Thank you, Bradley!
Could you please a simple video explaining difference between simotion and sinamics
Hey!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
My friend I want a brief video about safety relays
Thanks for the topic suggestion, Kahlil. I will definitely go ahead and forward this to our creator team. Happy learning!
Nice explanations
Happy to hear that, Ryoki. Thanks for your support!
how can i control the distance by using the encoder and how can we calculate the impulse
Hi Yahai,
Thanks for your comment!
I will pass this on to our course developers as a topic suggestion. This would make for a great future course video.
Happy learning!
So let's use the typical 1024 pulse per revolution shaft mounted encoder. That means each revolution of the motor send 1024 pulses to the motor controller, typically some kind of VFD or PLC which in turn controls the motor controller. Most applications are geared so that means we must take account the gear ratios between the motor and load. Let assume we are a 1:1 ratio and we are controlling rotational position scaled to units of degrees. It depends on the software used but in siemens motion control, you scale the units and define as rotational motion. This sets the units you use when setting acceleration or deceleration as degrees/sec/sec and position in degrees. You define the position of the movement in length units. Let's assume for simplicity we define 3600 length units per revolution of the motor, that means when I command the motor to move 3600 length units it will move the motor one revolution at whatever accelerating I defined. What the motor does depends on what type of movement you have chosen. There are several types of movements, ranging from absolute, relative, synchronization position and speed movements, gear in movements and other more complex movements. A simple position movement will be defined as either relative or absolute. A relative movement will move whatever length units you defined from its current position. An absolute move will move to that specific position. So let's say, our position is 3600 LU and we move relatively 10000 LU, the motor will move until the position is 13600 LU. An absolute move would have put the motor position at 10000 LU.
So to sum up, motion control is counting the encoder pulses from the motor and correlating that to some rotational or linear travel through defining this in meaningful units and issuing commands to the drive based on these units.
please give me a definition of the encoder?
Thank you for your question. I have provided two links to help you learn more about encoders.
www.encoder.com/article-what-is-an-encoder#:~:text=Simply%20put%2C%20an%20encoder%20is,count%2C%20speed%2C%20or%20direction.
ruclips.net/video/k2GQVJ4z0kM/видео.html
Happy learning from REALPARS!
Can we make incremental to absolute or vice versa....
No. This would require changing out the device. The incremental and absolute encoder signals are very different in the way the position is determined. Absolute encoders use multiple light paths to determine an absolute position whereas an incremental encoder has one light signal that pulses each time a fractional movement of the rotating disk is detected.
What is the difference between an incremental encoder and a absolute encoder?
An absolute encoder is designed such that the optical path through the encoder at any time indicates the absolute position of the encoder wheel, between 0 and 360 degrees rotation. An absolute encoder maintains its position information when power is removed from the encoder.
An incremental encoder gives only a change in position from one measurement time period to the next. An incremental encoder may need to be homed (moved to a fixed reference point) to initialize absolute position measurements.
@@realpars thank you 🙏
False! The absolute definition cannot account for the position angles between output changes. The only thing it could do is assume position angle based on current input to the motor and last known RPM. What that design us doing is giving an output every 1/6 rotation it seems.
However, if you were to add incremental pulses to the outter edge, you could know where the shaft is up to the resolution of the smallest gap between larger gaps. But if power is removed and restored it could only tell you which 1/6 its in and whether or not it is at an increment. But not which increment of that 1/6 it's at.
What application do you carry out the animations with?
Hi Gaston,
Thanks for your comment!
I am not sure about this as this is done by our graphic and animation department.
I really appreciate the video, content of video is quite enough to vive the idea of working of encoders. Can you please provide a video on "Heidenhain AK ERM 280" type encoders?
Hi Vikrant!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
Is there actually encoders that output binary? I thought Gray Code was what they used.
With an absolute encoder, there is a distinct bit pattern for every position, so that the position can precisely be known. Many absolute encoders utilize multiple disks for position determination and many are able to determine absolute position over up to 4096 increments/turn.
Yes you are correct.
Excelente, parabéns!!!
Thank you!
thinks for information it is very nice
Am I right? Incremental Encoder used in cash sorting machine for counting.
In a sense, you are correct. The bills are mechanically pulled through a microprocessor scanner one at a time, and based on how many times a beam of light is interrupted, the machine knows how many bills it pulled through. While this is technically not an incremental encoder, it works pretty much the same. As the bills go through the cash sorter, combinations of Ultraviolet (UV), Magnetic (MG), and Infrared (IR) are used for counterfeit detection and pattern recognition is used for detecting the denomination and orientation.
RealPars "crew", would you please define "absolute position" for me? Thank You.
@Mohammad Reza, I appreciate Mohammad.
Great! Can i use your video and translate to vietnamese?
Pls answer for me.
Goodluck to you and thanks for your videos.
Hi there,
We're glad you found RealPars videos useful; You can share our video as long as it remains unmodified, tagged and credited back to us.
Unfortunately downloading our videos from RUclips or RealPars platform and translating them goes against RUclips and also RealPars copyright.
Thanks for your understanding.
In a video i saw about my encoder , it did not require a power source. A womans hand turned the shaft and the led board lit up. I figured pretty simple setup. After receiving my encoder i hooked it to the led board and nothing happened. What am i missing ??? Im not an electronics wiz.
Thank you for your inquiry. In general, electronic devices necessitate power to facilitate the transmission and reception of information. This power can originate from an external source like a power supply or internal batteries. Some devices are even capable of generating their own power through rotation. For specific guidance on your encoder, I recommend reviewing the installation manual or reaching out to the vendor you obtained it from. Wishing you a productive learning experience with RealPars!
@@realpars theres no manual
but Incremental encoders have 2 lasers to be able to sense direction
Yes, there are typically 2 "code tracks" that are slightly out of phase so that both position and direction can be detected. Some incremental encoders use two separate light sources (could be LED's, laser. etc) and two receivers to determine the position and direction of rotation.
Most encoders are in quadrature. 01-25-2020.
THANK YOU SIR
You're very welcome!
Just subscribed!
Great! Welcome to the RealPars family, George!
Can you please help me to make a code for DMX512 stapper motor with encoder
Please help me
Thank you for all video tutorial very helfull.
You are very welcome, Alvin! Thanks for your support.
Thanks 👍
You're very welcome, Emilios!
Thanks a lot!
You are very welcome!
Thank You :)
You are very welcome!
Awesome!!!
Thank you!
I have a absolute type encoder which is gray code output may i replace it with Binary coded absolute encoder? If you know please help me Thanks in advance.
Yes. HOWEVER, gray code and binary are not the same number system, so you would need to modify your PLC code to replace the gray code to absolute position conversion with a binary code to absolute position conversion.
@@realpars Thanks for your reply
Merci beaucoup
Our pleasure!