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
Eric Chesak created a sensor that can detect clouds, and it can also measure different sources of radiation.
Festo's BionicKangaroo combines pneumatic and electrical drive technology, plus very precise controls and condition monitoring. Like a real kangaroo, the BionicKangaroo robot harvests the kinetic energy of each takeoff and immediately uses it to power the next jump.
Practicing engineers have not heeded Yoda's words.
Design News and Digi-Key presents: Creating & Testing Your First RTOS Application Using MQX, a crash course that will look at defining a project, selecting a target processor, blocking code, defining tasks, completing code, and debugging.
Rockwell Automation recently unveiled a new safety relay that can be configured and integrated through existing software to program safety logic in devices.
More:Blogs|News
Design News Webinar Series
3/27/2014 11:00 a.m. California / 2:00 p.m. New York / 7:00 p.m. London
2/27/2014 11:00 a.m. California / 2:00 p.m. New York / 7:00 p.m. London
12/18/2013 Available On Demand
11/20/2013 Available On Demand
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Apr 21 - 25, Creating & Testing Your First RTOS Application Using MQX
SEMESTERS: 1  |  2  |  3  |  4  |  5


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: April 29 - Day 1
Sponsored by maxon precision motors
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service