HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Blogs
Mechatronics Zone

Encoders Know All the Angles

NO RATINGS
View Comments: Newest First|Oldest First|Threaded View
mrdon
User Rank
Gold
Re: ROTARY ENCODERS
mrdon   1/20/2013 8:45:07 PM
NO RATINGS
Hi Jon, Nice summary of the various encoders and their applications to motors. I'll be sharing this material with my Controls Systems class at ITT Tech along with the encoder handbook. I look forward to reading your column on resolvers.

Jon Titus
User Rank
Blogger
Re: ROTARY ENCODERS
Jon Titus   1/20/2013 3:29:21 PM
NO RATINGS
Thanks, Bobj.  My next column will introduce resolvers that produce an analog output.  Interesting devices and a lot more to them that engineers might think.

bobjengr
User Rank
Platinum
ROTARY ENCODERS
bobjengr   1/20/2013 1:14:17 PM
NO RATINGS
Jon, excellent article.   I do considerable work in designing and developing work cells for robotic systems.  Rotary and linear encoders are extremely valuable and accurate and provide just about the only reliable method for determining shaft position--which is critical to the function of the equipment.   Having a basic understanding of how they work is paramount when trying to bring about a "fix" or troubleshooting a problem. Many thanks for the information.

Jack Rupert, PE
User Rank
Platinum
Re: encoder or resolver ?
Jack Rupert, PE   1/19/2013 5:21:50 PM
NO RATINGS
Interesting observation, Jon.  That could be the answer.  Sort of a hybrid system.

Jon Titus
User Rank
Blogger
Re: encoder or resolver ?
Jon Titus   1/12/2013 3:16:53 PM
NO RATINGS
Hi, Jack.

Perhaps the analog encoders use a type of analog-signal detector (magnetic, capacitive...) and then perform the analog-to-digital conversions and information coding within the encoder case.

Jack Rupert, PE
User Rank
Platinum
Re: encoder or resolver ?
Jack Rupert, PE   1/12/2013 3:07:26 PM
NO RATINGS
I don't know about you, but it seems to me that industry in general is really starting to confuse those two words.  I've seen ads for "analog encoders" that talk about their internal technologies that perfectly describe a resolver.  (I also dont' think the 90% of recent college graduates could define one difference).

Jon Titus
User Rank
Blogger
Re: encoder or resolver ?
Jon Titus   1/6/2013 11:05:58 PM
NO RATINGS
The encoders provide an output that immediately indicates position information. A resolver produces signals that require demodulation.  I'll talk about resolvers in another column, coming soon.

GlennA
User Rank
Gold
encoder or resolver ?
GlennA   1/6/2013 10:20:30 PM
NO RATINGS
I have only heard of rotary magnetic coupled devices called resolvers.  The two versions that I have seen are an exciter input and sine and cosine outputs, or sine and cosine inputs and a resultant output.  Another component used with encoders in robotics is the revolution counter - the motor may turn many rotations in an axis' range of motion.

Partner Zone
More Blogs from Mechatronics Zone
Suppose you wanted to create a FIR filter with your own requirements. How would you find the necessary coefficients, and how many of them would you need?
Switched-capacitor filters have a few disadvantages. They exhibit greater sensitivity to noise than their op-amp-based filter siblings, and they have low-amplitude clock-signal artifacts -- clock feedthrough -- on their outputs.
This column wraps up our discussion of encoders with information about resolvers, which provide angular data over 360 degrees.
The Machinist Calc Pro computes speeds and feed rates for milling, turning, and drilling: cutting speed, spindle speed, feed rate (inches/minute), cutting feed, etc.
Design News Webinar Series
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
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
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Sep 8 - 12, Get Ready for the New Internet: IPv6
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: September 30 - October 2
Sponsored by Altera
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