prepared by: berk demirgok dept. of electrical and computer engineering utah state university...
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ECE5320 MECHATRONICSASSIGNMENT#01: LITERATURE SURVEY ON SENSORS
AND ACTUATORS
TOPIC: POSITION SENSORS/ROTARY ENCODERS
Prepared by: Berk Demirgok
Dept. of Electrical and Computer Engineering
Utah State University
3/15/2012
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Content
Overview of position sensors
Applications of position sensors
Types of position sensors
Applications
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Content
Study Rotary Encoders in position sensors
Specifications
Purchasing
References
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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
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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
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References and To explore further
http://www.sensors-transducers.machinedesign.com/guiEdits/Content/bdeee4/bdeee4_3.aspx
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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.
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Types of Position Sensors
Linear Positions
Angular Positions
Rotary Positions
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Major Applications
Servomotors Amusement equipment Music live control Computer game joysticks Steering wheels Robot applications Industrial applications
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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.
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• 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:72
• http://todbot.com/blog/wp-content/uploads/2008/06/rotary-encoder-closeup-300x221.jpg
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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.
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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.
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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.
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Illustration of how it works
• http://en.wikipedia.org/wiki/Rotary_encoder#Incremental_rotary_encoder
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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
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Types of Rotary Encoders
http://img.deusm.com/designnews/289/289447-Incremental_Optical_Encoder.jpg
Incremental rotary encoder looks like this
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Types of Rotary Encoders
Standard rotary encoders
http://www.industrystock.com/pressenewsimages/orig/cde86e815031c45457c1ba273b8c88d0.jpg
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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
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Types of Rotary Encoders
Kit rotary encoders
http://images.tradekool.com/199762700/Encoder-Module-Kit-Encoder-Optical-Encoder-Rotary-Encoder.jpg
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Types of Rotary Encoders
Single channel rotary encoders
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Applications
Rotary encoders have very wide-range application areas and some of them are mentioned as: Industrial Controls Robotics Photographic Lenses Cellphones Computers Automotive
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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
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Purchasing
http://www.marshbellofram.com/servotek/Rotary%20Encoders.JPG
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Price Range Research
Light Duty use rotary encoders
$25-$125 Medium Duty use rotary encoders
$75-$200 Heavy Duty use rotary encoders
$150-$300
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Questions?