On Saturday 15 February 2020 06:29:08 N wrote:
> > On Friday 14 February 2020 02:01:08 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
> >
> >
partial reply to Gene's comments.
https://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0276.pdf
On 2/14/20 6:20 PM, Gene Heskett wrote:
On Friday 14 February 2020 16:30:51 Andy Pugh wrote:
On 14 Feb 2020, at 20:55, Gene Heskett wrote:
The coils are usually
> On Friday 14 February 2020 02:01:08 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
>
> I'm not Chris, but the word quadrature means two signals that
On Fri, 14 Feb 2020 08:14:18 -0800
Chris Albertson wrote:
> Looking at the PDF, It seems I forget to ask one question about the signal:
> Is the sin/cos signal single-ended or differential? In other words is it
> referenced to ground or do we get pins with labels like sin+ and sin-
These
Andy the EXE box looks like the right price if t will do the job. I'll
have a look at it. And all the data sheets etc.
Regards
Andrew
On Sat, Feb 15, 2020, 5:16 AM andy pugh wrote:
> On Fri, 14 Feb 2020 at 15:29, dave engvall wrote:
>
> >
> >
> >
>
On Friday 14 February 2020 16:30:51 Andy Pugh wrote:
> > On 14 Feb 2020, at 20:55, Gene Heskett wrote:
> >
> > The coils are usually isolated, with op-amp bias supplied to one end
> > of the coils, so you get sin plus and minus and cosine + and -
>
> I don’t think we are talking about coils
> On 14 Feb 2020, at 20:55, Gene Heskett wrote:
>
> The coils are usually isolated, with op-amp bias supplied to one end of
> the coils, so you get sin plus and minus and cosine + and -
I don’t think we are talking about coils here.
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On Friday 14 February 2020 11:14:18 Chris Albertson wrote:
> Looking at the PDF, It seems I forget to ask one question about the
> signal: Is the sin/cos signal single-ended or differential? In other
> words is it referenced to ground or do we get pins with labels like
> sin+ and sin-
The
Sorry. Yes, a math error.A better estimate of the worst-case might to
20,000 RPM and 1000 pulses per rev. That means 330,000 per second for
each channel. But I bet close to 20,000 per second
A simple comparator with hysteresis would work well. You really do need
to add hysteresis to
On Fri, 14 Feb 2020 at 16:16, Chris Albertson
wrote:
>
> If there are even 100 pulses per revolution and the spindle runs at 100K
> RPM then we are talking about 1K or 10 MHz.
>
100,000 rpm is _very_ fast for a spindle. And even then you missed the 60
in rpm / Hz conversion.
--
atp
"A
Looking at the PDF, It seems I forget to ask one question about the signal:
Is the sin/cos signal single-ended or differential? In other words is it
referenced to ground or do we get pins with labels like sin+ and sin-
If there are even 100 pulses per revolution and the spindle runs at 100K
On Fri, 14 Feb 2020 at 15:29, dave engvall wrote:
>
>
> 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
Resolvers are a different (and slightly harder) problem
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,
On Friday 14 February 2020 07:29:53 Gene Heskett wrote:
> On Friday 14 February 2020 02:01:08 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
>
> I'm not
On Friday 14 February 2020 02:01:08 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
I'm not Chris, but the word quadrature means two signals that change
state
OK I'll try track down the data sheet. Failing that I'll borrow a
oscilloscope and have a play. I'll post back here tomorrow
Thanks chris
Regards
Andrew
On Fri, Feb 14, 2020, 8:51 PM Chris Albertson
wrote:
> First step is to understand (1) what you have and (2) what you need.
>
> So, If
First step is to understand (1) what you have and (2) what you need.
So, If the spindle revolves one time, How many cycles of the sin wave do
you see? What is the amplitude of the sine wave (in volts peak to peak)?
Does the amplitude change with the spindle speed?You need to either
read
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
wrote:
> A sin and cos are 90 degrees apart. All you should need to do is threshold
> the
my understanding is that most sin/cos are many lines per rev. It's just
that they are fancier lines than an encoder made for incremental output.
The index marker is one line per rev.
On Wed, Feb 12, 2020 at 1:25 PM Gene Heskett wrote:
> On Wednesday 12 February 2020 11:43:52 Chris Albertson
On Wed, 12 Feb 2020 at 06:46, andrew beck wrote:
>
> wondering if anyone has any ideas here.
Just to add to the mix, I have done this with an Arduino.
In my application I was also generating the excitation voltage for a
resolver, so it was a little more involved.
Fundamentally it is two
On Wednesday 12 February 2020 11:43:52 Chris Albertson 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
Jon, I cant find US dist either
maybe the TI chips are better is the states
http://www.ti.com/lit/ug/tidua05a/tidua05a.pdf
http://www.ti.com/lit/df/tidrf54/tidrf54.pdf
hth
tomP
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On 02/12/2020 05:21 AM, Thomas J Powderly wrote:
hello
BTW if your encoder is 11uA ( not 5V not 1Vp/p )
then the last diagram here may be of use
http://pdf.dzsc.com/RLX/RLXA2510.pdf
Hey, this is a GREAT chip! But, can you actually buy them?
All I see are Russia and AliBaba, no US
On 02/12/2020 12:43 AM, andrew beck wrote:
Hi guys
wondering if anyone has any ideas here.
I have a heidanhain spindle motor that runs up to 1 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
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
gene,
On 2/12/20 10:38 PM, Gene Heskett wrote:
On Wednesday 12 February 2020 05:55:34 you wrote:
...
so make sure you know the full heidenhain part number when hunting
info
that means the full identifier is more than just 1 box on the label )
Yes, I've noted the frustration creation of
Check the max frequency on any encoder you look at. The inexpensive ones
max out at 200 K. Frequency is not a problem is you want to throw $$ at
it. It is very hard to win; lots of counts at the high end but not many
when you are creeping. There just ain't no free lunch.
Dave
On 2/11/20
http://pico-systems.com/osc2.5/catalog/product_info.php?products_id=31=2n4hbnn63oqt9ncdlervb08tv6
On 2/12/20 1:52 AM, Gene Heskett wrote:
On Wednesday 12 February 2020 01:49:34 andrew beck wrote:
the option I just thought of while googling is, can I convert the sin
cos format in to a normal
On Wed, 12 Feb 2020 at 06:46, andrew beck wrote:
I have a heidanhain spindle motor that runs up to 1 rpm and has a 5v
> sin cos encoder on it.
>
Try looking on eBay for a Heidenhain EXE box. (Though I am not sure that
they work with 5V sin/cos)
--
atp
"A motorcycle is a bicycle with a
I think the 5v are newer than the ones I have researched in the past.
Don't they have a converter card for ttl/quadrature? They certainly do for
the older types. People seem to have used the TIDA-00178 converter board.
On Wed, Feb 12, 2020 at 1:46 AM andrew beck
wrote:
> Hi guys
>
> wondering
hello
BTW if your encoder is 11uA ( not 5V not 1Vp/p )
then the last diagram here may be of use
http://pdf.dzsc.com/RLX/RLXA2510.pdf
heidenhain encoders are good equipment, it'd be sad to change it out.
hth tomp
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On Wednesday 12 February 2020 01:49:34 andrew beck wrote:
> the option I just thought of while googling is, can I convert the sin
> cos format in to a normal TTL or something like that? even 1000 ppr
> would be heaps it is only on the spindle.
One thing you might try, is to use a couple of
On Wednesday 12 February 2020 01:43:33 andrew beck wrote:
> Hi guys
>
> wondering if anyone has any ideas here.
>
> I have a heidanhain spindle motor that runs up to 1 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
the option I just thought of while googling is, can I convert the sin cos
format in to a normal TTL or something like that? even 1000 ppr would be
heaps it is only on the spindle.
I just want to get the data into the vfd so It knows when the motors is
slowing down. and so I can rigid tap and
Hi guys
wondering if anyone has any ideas here.
I have a heidanhain spindle motor that runs up to 1 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
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