Incremental Encoder Question

  • Thread starter tomizzo
  • Start date
  • #1
114
2
So I've been trying to read up a little on incremental encoders and have been looking at the outputted signals typically labeled A and B. These signals are 90 degrees out of phase. Apparently, the purpose of having both of these signals is for identifying motor direction. However, I'm kind of confused as to how the order of the A and B signals are able to show direction.

I've searched the web and physics forums database but was not able to find any discussion in how direction effects the order of signal outputs. Any help?
 

Answers and Replies

  • #2
35,337
11,648
A and B detect the rotation of something?

In one direction, the signal will look like A(short pause)B(long pause)A..., in the other the long pause is after A and the short one is after B.
 
  • #4
meBigGuy
Gold Member
2,323
405
Basically if you look at the level of the B when A rises you will see it is high in one direction of rotation and low in the other. Connect A to the clock of an up-down counter and B to the up-down control and you get a relative position detector.
 

Related Threads on Incremental Encoder Question

  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
2
Views
952
  • Last Post
Replies
5
Views
3K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
1
Views
1K
Replies
13
Views
1K
  • Last Post
Replies
4
Views
1K
Replies
5
Views
8K
Top