Dynomotion

Group: DynoMotion Message: 11058 From: rjreese29@ymail.com Date: 2/10/2015
Subject: Quadrature spindle encoder
Hi,
I am interested in making a spindle encoder with use of 2 Hall effect sensors that will wire directly into an encoder Channel's a & b on the kflop (probably io40 & 41)
Are there any good posts on this topic?
(I am Having a challenge weeding through posts, but read a few)

Criteria: (true or false? & addittional thoughts)
1) Sensors should be mounted 90deg apart
2) duration of the on-state of the sensor to be detected by kflop is ... What is the minimum duration? I am not sure on this one.
3) in regards to the kflop and someone making an encoder, I read a post that it was recommended to use a .c program called mpgsmooth.c and... To make a question out of this, what would be required in terms of making the kflop read this simple 2 sensor encoder and what are the limitations?
4)...

Your thoughts or old posts on how to do this are appreciated,

Thanks,
Rob
Group: DynoMotion Message: 11059 From: TK Date: 2/11/2015
Subject: Re: Quadrature spindle encoder
Hi Rob,

It isn't clear what you mean. The two sensors should each generate a 50% duty cycle square wave and the two signals should have a 90 degree phase shift.  It isn't clear to me how you would do this with Hall sensors.  Here is a related thread:


KFLOP hardware encoder inputs should have transitions at least 1us apart. 

If you have encoder type signals connected to a hardware encoder input no special C Program would be required. 

Regards
TK

On Feb 10, 2015, at 4:44 PM, rjreese29@... [DynoMotion] <DynoMotion@yahoogroups.com> wrote:

 

Hi,
I am interested in making a spindle encoder with use of 2 Hall effect sensors that will wire directly into an encoder Channel's a & b on the kflop (probably io40 & 41)
Are there any good posts on this topic?
(I am Having a challenge weeding through posts, but read a few)

Criteria: (true or false? & addittional thoughts)
1) Sensors should be mounted 90deg apart
2) duration of the on-state of the sensor to be detected by kflop is ... What is the minimum duration? I am not sure on this one.
3) in regards to the kflop and someone making an encoder, I read a post that it was recommended to use a .c program called mpgsmooth.c and... To make a question out of this, what would be required in terms of making the kflop read this simple 2 sensor encoder and what are the limitations?
4)...

Your thoughts or old posts on how to do this are appreciated,

Thanks,
Rob
Group: DynoMotion Message: 11075 From: Rjreese29 Date: 2/13/2015
Subject: Re: Quadrature spindle encoder
Thanks Tom,

The Hall effects I ordered are cherry electronics barrel sensor (mp1001 series). It should work as at least an index pulse, so I am happy there and that will be good enough let's hope.

As for them acting as an encoder, It has a square wave, but I will be lacking the duty cycle requirements.

Thanks for all your insights

Rob

On Feb 11, 2015, at 1:39 AM, TK tk@... [DynoMotion] <DynoMotion@yahoogroups.com> wrote:

 

Hi Rob,

It isn't clear what you mean. The two sensors should each generate a 50% duty cycle square wave and the two signals should have a 90 degree phase shift.  It isn't clear to me how you would do this with Hall sensors.  Here is a related thread:


KFLOP hardware encoder inputs should have transitions at least 1us apart. 

If you have encoder type signals connected to a hardware encoder input no special C Program would be required. 

Regards
TK

On Feb 10, 2015, at 4:44 PM, rjreese29@... [DynoMotion] <DynoMotion@yahoogroups.com> wrote:

 

Hi,
I am interested in making a spindle encoder with use of 2 Hall effect sensors that will wire directly into an encoder Channel's a & b on the kflop (probably io40 & 41)
Are there any good posts on this topic?
(I am Having a challenge weeding through posts, but read a few)

Criteria: (true or false? & addittional thoughts)
1) Sensors should be mounted 90deg apart
2) duration of the on-state of the sensor to be detected by kflop is ... What is the minimum duration? I am not sure on this one.
3) in regards to the kflop and someone making an encoder, I read a post that it was recommended to use a .c program called mpgsmooth.c and... To make a question out of this, what would be required in terms of making the kflop read this simple 2 sensor encoder and what are the limitations?
4)...

Your thoughts or old posts on how to do this are appreciated,

Thanks,
Rob