Hello. 1
In this video we are going to learn resolver encoder and what is the difference between resolver and 2
encoder. 3
I will make it bigger it for you. 4
Let's check firstly this is our resolver and resolver it is used to understand the position of the motor. 5
It can go turn forward or backward and the cables from resolver is 8, 8. 6
Cable comes from this over and two is cos +/- and 2 is sin +/- and 2 is reference and 2 is from temperature 7
sensor of the motor. 8
And in here we have a encoder , for the encoder. 9
We have a rotary encoder from autonics and on the encoder I can read for you it is. 10
I am going to say E40H8 1024-6 l 5 11
So this is 1024 PPR encoder in one turn it will create 1024 pulse for us and in here from encoder 12
you can see the cabling for the cabling black cable from encoder is a + and red cable is a - 13
and white cable is B + and B - and z+ z- and brown + positive so that means 14
24 volt and the blue is 0volt and shield. 15
So from encoder what we have also we have similar 8 cable is coming from encoder and one is just for 16
shield then I will try to draw it here to the structure of resolver it and encoder to here and we will 17
understand it better for the resolver where and what will we do. 18
The structure is like this and I will put in here 19
and than 20
it will be like this but doesn't matter. 21
This is cos is for the reference and this is sin and this is reference. 22
So what happens for the resolver reference turns clockwise or counterclockwise and according to reference 23
it is giving. 24
This is really important point. 25
Analog so it is giving an analog output to the drive analog to drive. 26
So what happens. 27
Drive can understand the position according to reference signals and reference signals understand 28
the situation or position cos and sin situation or position. 29
This is sin and this is cos is according to this reference. 30
Can understand where I am and which value that I am going to send to drive than resolver 31
Works like this the structure of resolver it is like this four encoder maybe you remember I will draw 32
it in here. 33
What was it. 34
We have a gap or spaces like this all around the disk and in here we have a led and in here what we 35
have optical 36
device in here. 37
So each time encoder turning for example forward and then led is detect this optical device from this 38
gap. 39
It is giving a pulse and pulse and pulse and we already saw this was 1024 PPR and 1024 PPR will be 40
equal to 1024 gap on the disc. 41
So when this led is detect the optical device 1024 times this disc is going to finish his turn and also 42
we can say on this disc we have 1024 space and one turn will be equal to 1024 PPR. 43
--- 44
And this is I'm sorry this is a encoder that we are going to use this encoders for the motors a lot 45
time and also you can see resolver and this is the structure of the resolver. 46
And this is the structure of the encoder and this difference between we already said resolver is giving 47
an analog output but encoder is giving digital 48
output so that's so it's giving like a square wave and it's giving for example like this. 49
This is an analog and this is digital. 50
This is the difference between encoder and resolver. 51
So the last thing which one is more safe this is because of why this is giving an analog output. 52
So for example this disk can be damaged or these gaps can be damaged or it can give in one turn 53
for example 1 PPR. 54
So the encoder can be broken easily any time but analog signals it's coming from the reference from 55
the resolver it is not breaking a lot of times it is more reliable more safely and much more to be useful 56
for your projects. 57
But you you need a drive to understand the situation of to resolver it then you can use it. 58
So I'm finished for this video. 59
We already saw the resolver and encoder. 60
The structure of this two material in the next videos we will do some exercises about the encoders and 61
resolvers. 62
See you in the next video.