HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
News
Electronics & Test

Design Decisions: Choosing a Rotary Encoder

NO RATINGS
View Comments: Threaded|Newest First|Oldest First
Amclaussen
User Rank
Platinum
Sometimes resolution is not important, but other things are.
Amclaussen   1/4/2012 12:09:48 PM
NO RATINGS
We are using a RVDT to track the opening percentage of large Ball type valves used in Pipelines to monitor closing sequence and speed.  Here, resolution was not necessary, but reliability is of utmost importance; the RVDT is rugged and very reliable.  Amclaussen.

Alexander Wolfe
User Rank
Blogger
Re: Sometimes resolution is not important, but other things are.
Alexander Wolfe   1/4/2012 1:06:19 PM
NO RATINGS
Positional accuracy seems like the key spec when choosing a rotary encoder, but what about MTBF? Does that come into play at all, especially considering that it's a part which gets a heavy and constant workout?

TJ McDermott
User Rank
Blogger
Re: Sometimes resolution is not important, but other things are.
TJ McDermott   1/4/2012 10:18:18 PM
NO RATINGS
Environmental protection is frequently a deciding factor in industrial environments.  Can it take being hosed down with high pressure, caustic solutions such as is found in food processing?  Can it resist coolant or oil?

Jack Rupert, PE
User Rank
Platinum
Re: Sometimes resolution is not important, but other things are.
Jack Rupert, PE   1/22/2012 2:34:50 PM
NO RATINGS
Absolutely, Alex.  In my previous position, the MBTF was actually more important than linear accuracy.  It was so true that "others" demanded a spare as part of the standard BOM, rather than on the list of suggestions for our customers.  (It was useful too, when the mechanical system fail and destoyed the position sensor - which actually was working quite well).

GlennA
User Rank
Gold
resolver vs encoder
GlennA   1/6/2012 8:58:52 AM
NO RATINGS
My experience with resolvers was with ABB industrial robots.  The first absolute positioning system I saw used 3 resolvers (IRB 90), followed by 2 (IRB 2000) and finally 1 resolver and a revolution counter (IRB 6400).  The feature I thought was most useful was it 'failed-safe'.  An axis with an encoder has to fail to show movement feed-back when commanded to move to detect a failure.  How far does tha axis move before the lack of position change feed-back causes a fault ?  With a resolver, a broken wire causes a failure during initialization.

Partner Zone
Latest Analysis
Earlier this year paralyzed IndyCar drive Sam Schmidt did the seemingly impossible -- opening the qualifying rounds at Indy by driving a modified Corvette C7 Stingray around the Indianapolis Motor Speedway.
As companies rush into IoT connectivity, the choice of doing it yourself or using a platform from a service company becomes a major issue.
Wearables are changing the way we see ourselves. With onboard sensors that have access to our bodies, we are starting to know our physical selves like never before, quantifying our activity, our heart rate, breathing, and even our muscle effort.
Last week, the bill for reforming chemical regulation, the TSCA Modernization Act of 2015, passed the House. If it or a similar bill becomes law, the effects on cost and availability of adhesives and plastics incorporating these substances are not yet clear.
This year, Design News is getting a head start on the Fourth of July celebration. In honor of our country and its legacy of engineering innovation -- in all of its forms -- we are taking you on an alphabetical tour through all 50 states to showcase interesting engineering breakthroughs and historically significant events.
More:Blogs|News
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jul 6 - 10, Building Raspberry Pi Controllers with Python
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7


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.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service