ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Position Sensors/Rotary encoders

1. ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Topic: Position Sensors/Rotary encoders Prepared by: BerkDemirgok Dept. of Electrical and Computer Engineering Utah State University 3/15/2012

2. Content • Overview of position sensors • Applications of position sensors • Types of position sensors • Applications

3. Content • Study Rotary Encoders in position sensors • Specifications • Purchasing • References

4. References and To explore further • “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/Overview/Catalog/Sensors_-z-_Encoders/Encoders?source=google&keyword=rotary%20encoders%20incremental&type=search&gclid=CMOT44X19q4CFQUZQgodyHEJzA

5. References and To explore further • http://www.electronics-tutorials.ws/diode/diode_8.html • http://www.electronics-tutorials.ws/io/io_2.html • http://www.eowave.com/products.php?prod=21 • http://www.autonics.com/products/products_2.php?big=01&mid=01/06

6. References and To explore further • http://www.sensors-transducers.machinedesign.com/guiEdits/Content/bdeee4/bdeee4_3.aspx

7. Overview •  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. Types of Position Sensors • Linear Positions • Angular Positions • Rotary Positions

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

10. Rotary Encoders • 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=2Rz18G1gJ9BnXM:&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:72http://www.google.com/imgres?q=rotary+encoders&hl=en&sa=X&rlz=1C1CHFX_enUS474US474&biw=1024&bih=624&tbm=isch&prmd=imvns&tbnid=2Rz18G1gJ9BnXM:&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

12. How it works? • 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. How it works? • 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. How it works? • 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. Illustration of how it works • http://en.wikipedia.org/wiki/Rotary_encoder#Incremental_rotary_encoder

16. Types of Rotary Encoders • 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. Types of Rotary Encoders Incremental rotary encoder looks like this http://img.deusm.com/designnews/289/289447-Incremental_Optical_Encoder.jpg

18. Types of Rotary Encoders • Standard rotary encoders http://www.industrystock.com/pressenewsimages/orig/cde86e815031c45457c1ba273b8c88d0.jpg

19. Types of Rotary Encoders • 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. Types of Rotary Encoders • Kit rotary encoders http://images.tradekool.com/199762700/Encoder-Module-Kit-Encoder-Optical-Encoder-Rotary-Encoder.jpg

21. Types of Rotary Encoders • Single channel rotary encoders

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

23. Purchasing • 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.mouser.com • http://honeywell.com • www.eowave.com

24. Purchasing http://www.marshbellofram.com/servotek/Rotary%20Encoders.JPG

25. Price Range Research • Light Duty use rotary encoders • $25-$125 • Medium Duty use rotary encoders • $75-$200 • Heavy Duty use rotary encoders • $150-$300

26. Questions?