1. Prepared by: Berk Demirgok Dept. of Electrical and Computer Engineering Utah State University 3/15/2012

2.  Overview of position sensors  Applications of position sensors  Types of position sensors  Applications

3.  Study Rotary Encoders in position sensors  Specifications  Purchasing  References

4.  “Mechatronics – An Integrated Approach” by Clarence W. de Silva  Wikipedia  Mechanical measurements by Thomas G. Beckwith, Roy D. Marangoni, John H. Lienhard  http://www.automationdirect.com/adc/Over view/Catalog/Sensors_-z- _Encoders/Encoders?source=google&keyword =rotary%20encoders%20incremental&type=sea rch&gclid=CMOT44X19q4CFQUZQgodyHEJz A http://www.automationdirect.com/adc/Over view/Catalog/Sensors_-z- _Encoders/Encoders?source=google&keyword =rotary%20encoders%20incremental&type=sea rch&gclid=CMOT44X19q4CFQUZQgodyHEJz A

5.  http://www.electronics- tutorials.ws/diode/diode_8.html http://www.electronics- tutorials.ws/diode/diode_8.html  http://www.electronics- tutorials.ws/io/io_2.html http://www.electronics- tutorials.ws/io/io_2.html  http://www.eowave.com/products.php?prod =21 http://www.eowave.com/products.php?prod =21  http://www.autonics.com/products/products _2.php?big=01&mid=01/06 http://www.autonics.com/products/products _2.php?big=01&mid=01/06

6.  http://www.sensors- transducers.machinedesign.com/guiEdits/Con tent/bdeee4/bdeee4_3.aspx http://www.sensors- transducers.machinedesign.com/guiEdits/Con tent/bdeee4/bdeee4_3.aspx

7.  A position sensor is a device allowing position measurements.  The sensor can either be to some fixed point or position or from some fixed point or position.  A position sensor can measure any positions, such as linear positions, angular positions and rotary positions.

8.  Linear Positions  Angular Positions  Rotary Positions

9.  Servomotors  Amusement equipment  Music live control  Computer game joysticks  Steering wheels  Robot applications  Industrial applications

10.  Rotary encoders are also called shaft encoders.  Rotary encoder converts angular position of mechanical movement of a shaft or axle to an analog or digital signal.  Generally, digital signal is preferred.

11. http://www.google.com/imgres?q=rotary+encoders&hl=en&sa=X&rlz=1C1CHFX_ enUS474US474&biw=1024&bih=624&tbm=isch&prmd=imvns&tbnid=2Rz18G1gJ9Bn XM:&imgrefurl=http://www.karacnc.com/products.html&docid=bc9LaH0jfjAktM &imgurl=http://www.karacnc.com/images/rotaryencoder.jpg&w=277&h=277&ei= FT9pT431IqeYiQKW4dDbBg&zoom=1&iact=hc&vpx=270&vpy=292&dur=807&hovh =221&hovw=221&tx=102&ty=133&sig=103248373012637440328&page=5&tbnh=133& tbnw=136&start=72&ndsp=20&ved=1t:429,r:6,s:72 http://www.google.com/imgres?q=rotary+encoders&hl=en&sa=X&rlz=1C1CHFX_ enUS474US474&biw=1024&bih=624&tbm=isch&prmd=imvns&tbnid=2Rz18G1gJ9Bn XM:&imgrefurl=http://www.karacnc.com/products.html&docid=bc9LaH0jfjAktM &imgurl=http://www.karacnc.com/images/rotaryencoder.jpg&w=277&h=277&ei= FT9pT431IqeYiQKW4dDbBg&zoom=1&iact=hc&vpx=270&vpy=292&dur=807&hovh =221&hovw=221&tx=102&ty=133&sig=103248373012637440328&page=5&tbnh=133& tbnw=136&start=72&ndsp=20&ved=1t:429,r:6,s:72 http://todbot.com/blog/wp-content/uploads/2008/06/rotary-encoder-closeup- 300x221.jpg http://todbot.com/blog/wp-content/uploads/2008/06/rotary-encoder-closeup- 300x221.jpg

12.  Rotary encoder works just like an optical encoder.  Lights from LED or infra-red light visible semiconductor diodes goes through a rotating encoded disk which contains the required code designs in binary grey code. Then, photo sensors examine the disk while it is rotating.

13.  While the disk rotates, an electronic circuit procedures the information from rotating disk into a digital information in binary code.  Converted digital output is in binary code form because, binary code helps controllers to determine the actual angular position of the shaft or axle.

14.  After the output converted into digital signal, a rotary encoder can helps us to know position or distance. Moreover, rotary encoders also can provide information about speed, revolution.

15. http://en.wikipedia.org/wiki/Rotary_ encoder#Incremental_rotary_encoder http://en.wikipedia.org/wiki/Rotary_ encoder#Incremental_rotary_encoder

16.  Incremental rotary encoders  Delivers only cyclical outputs when the encoder is rotating.  Incremental rotary encoders can get one of three following signal categories:  Quadrature  Single channel  Pulse  Direction

17. http://img.deusm.com/designnews/289/ 289447-Incremental_Optical_Encoder.jpg Incremental rotary encoder looks like this

18.  Standard rotary encoders http://www.industrystock.com/pressene wsimages/orig/cde86e815031c45457c1ba2 73b8c88d0.jpg

19.  Modular rotary encoders  Modular rotary encoders are the most sensitive to motor shaft run-out and axial movement. They are commonly used in servomotors. http://img.directindustry.com/images_di /photo-m2/miniature-optical-incremental- rotary-encoder-734405.jpg

20.  Kit rotary encoders http://images.tradekool.com/199762700/ Encoder-Module-Kit-Encoder-Optical- Encoder-Rotary-Encoder.jpg

21.  Single channel rotary encoders

22.  Rotary encoders have very wide-range application areas and some of them are mentioned as:  Industrial Controls  Robotics  Photographic Lenses  Cellphones  Computers  Automotive

23.  Rotary Position sensor can be easily purchased from many online stores  Here is some good web-sites to look if you want to buy rotary position sensor.  www.digikey.com www.digikey.com  www.mouser.com www.mouser.com  http://honeywell.com http://honeywell.com  www.eowave.com www.eowave.com

24. http://www.marshbellofram.com/servote k/Rotary%20Encoders.JPG

25.  Light Duty use rotary encoders  $25-$125  Medium Duty use rotary encoders  $75-$200  Heavy Duty use rotary encoders  $150-$300