a bit overdone for your app but this should give you an idea. page down
to fig 16.
https://www.st.com/content/ccc/resource/technical/document/application_note/group0/6a/82/83/37/61/69/4e/74/DM00497286/files/DM00497286.pdf/jcr:content/translations/en.DM00497286.pdf
Dave
On 2/13/20 11:01 PM, andrew beck wrote:
Chris. I'm still learning electronics. Could you expand a bit on this
please.
Maybe draw a napkin sketch of it. Sorry to be a bit slow on the uptake
On Thu, Feb 13, 2020, 5:46 AM Chris Albertson <albertson.ch...@gmail.com>
wrote:
A sin and cos are 90 degrees apart. All you should need to do is threshold
the signal and you have A/B quadrature. Many ways to threshold it but
you want the one with least noise.
A simple way to convert a sin wave to a square wave is to amplify then clip
it with diodes. A comparator can also convert the signal.
The point to remember is that sin/cos is quadrature and all that is needed
is some signal conditioning.
On Tue, Feb 11, 2020 at 10:46 PM andrew beck <andrewbeck0...@gmail.com>
wrote:
Hi guys
wondering if anyone has any ideas here.
I have a heidanhain spindle motor that runs up to 10000 rpm and has a 5v
sin cos encoder on it. I am currently controlling the motor with a
schiender vfd. I am talking to the support engineers here in New Zealand
about buying a encoder card so I can get better low down torque. If I
run
the card in full encoder closed loop control in the vfd I can get 200
percent of the torque right down to 0 rpm for 30 seconds or so which is
pretty useful. I am currently just running the drive in Variable
frequency
control which rapidly looses torque at low rpm.
Anyway they have a bunch of cards I can use but don't have a encoder card
that is suitable for sin cos encoders. I have no trouble changing the
encoder but am not sure if I can get a source of encoders that spin up to
10k rpm.
Anyone have any suggestions?
regards
Andrew
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Chris Albertson
Redondo Beach, California
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