More on Rotary Encoders

Out-of-phase detectors produce two pulse signals that indicate relative rotation as well as direction for an incremental encoder. Counting edges or monitoring binary values can increase resolution fourfold.
Out-of-phase detectors produce two pulse signals that indicate relative rotation as well as direction for an incremental encoder. Counting edges or monitoring binary values can increase resolution fourfold.

Return to Article

View Comments: Threaded|Newest First|Oldest First
Cabe Atwell
User Rank
Cabe Atwell   2/6/2013 4:24:53 PM
I hope to see more of the Wiegand effect encoders in the near future. It might be a good alternative to optical encoders in a closed loop stepper motor system. Which, by the way, are getting cheap enough for anyone to buy.



Nancy Golden
User Rank
Re: Encode
Nancy Golden   2/8/2013 10:03:49 AM
Great article - I particularly liked the mention of using hall effect sensors. Makes sense since historically they have been used as rotary position gear tooth sensors such as crank and camshaft sensing in automotive applications. They are usually a lot cheaper than optical encoders too.

Cabe Atwell
User Rank
Re: Encode
Cabe Atwell   2/8/2013 3:53:32 PM
Tech novelty aside, what are the prices?


TJ McDermott
User Rank
Strong magnetic fields
TJ McDermott   2/7/2013 10:08:37 AM
Jon, terrific article.

How sensitive is a wiegland effect encoder to strong magnetic fields?

Jon Titus
User Rank
Re: Strong magnetic fields
Jon Titus   2/7/2013 11:32:32 AM
Hello, TJ.  As far as I can tell, the magnetic field for a Wiegand detector must be very localized, so magnetic interference shouldn't become a problem.  Resolvers get used with equipment that uses electric motors, so I bet the manufacturers have added shielding as needed.  Worth asking about before you buy a resolver, and worth the time to run some tests in proximity to specific equipment.

User Rank
Does it work off-axis
btwolfe   2/7/2013 11:19:52 AM
In my applications, I often need an axis with a hollow bore, so the position encoder either needs to be hollow. From what I can tell, the Wiegard effect only works when the rotating magnet axis of rotation is centered about the Wiegard wire. I'm sure I've misunderstood the tech in some way and hope that my understanding is wrong.

If my understanding is wrong and the axial rotations do not have to align, then I'd be inclined to merge an optical absolute encoder with a Wiegard sensor for counting rotations. You'd get the resolution of optical with the persistent turn counting of the Wiegard sensor.

Partner Zone
More Blogs
Robots came into their own in the 1970s. Gone were the low-budget black-and-white B movies. Now robots roamed in full-color feature films with A-list actors.
Major global metropolitan areas are implementing a vast number of technology, energy, transportation, and Internet projects to make the metropolis a friendlier, greener, safer, and more sustainable place to be.
Here’s a look at robots depicted in movies and on TV during the 1950s and 1960s. We tried to collect the classics here, omitting the scores of forgettable B movies such as Santa Claus Conquers the Martians and Dr. Goldfoot and the Bikini Machine. Stay tuned for slideshows of robot stars from later decades.
A scientist at the University of Pittsburgh has achieved a breakthrough in the quest to create artificial cartilage with human cells for treatment of degenerative joint disease.
The LG G Watch is a smartwatch that was released by LG on June 25. It runs the Android-based Android Wear OS. See how it compares to Samsung's Gear Live, released the same day.
Design News Webinar Series
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
5/13/2014 10:00 a.m. California / 1:00 p.m. New York / 6:00 p.m. London
5/8/2014 11:00 a.m. California / 2:00 p.m. New York / 7:00 p.m. London
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jul 21 - 25, Design Products With Bluetooth Low Energy
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6

Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: August 12 - 14
Sponsored by igus
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service