On Tue, 7 Nov 2017, Nicklas Karlsson wrote:
Date: Tue, 7 Nov 2017 19:24:40 +0100
From: Nicklas Karlsson <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Subject: Re: [Emc-users] PID refresher for Gene? (limited resolution)
On Tue, 7 Nov 2017, Nicklas Karlsson wrote:
Date: Tue, 7 Nov 2017 19:15:58 +0100
From: Nicklas Karlsson <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Subject: Re: [Emc-users] PID refresher for Gene? (limited resolution)
On Tue, 7 Nov 2017 09:55:28 -0800 (PST)
"Peter C. Wallace" <[email protected]> wrote:
On Tue, 7 Nov 2017, Nicklas Karlsson wrote:
Date: Tue, 7 Nov 2017 18:48:24 +0100
From: Nicklas Karlsson <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Subject: Re: [Emc-users] PID refresher for Gene?
On Tue, 7 Nov 2017 12:28:31 -0500
Gene Heskett <[email protected]> wrote:
On Tuesday 07 November 2017 10:08:33 Peter C. Wallace wrote:
On Tue, 7 Nov 2017, Gene Heskett wrote:
I fail to see why a 2 or 3 percent error in duty cycle and or
quadrature results in so much noise. There simply is no way in hell
that spindle can be moving at 200 rpms on one servo-thread sample,
and 600 rpms on the next sample one millisecond later while its
filtered display on a pyvcp tach dial says 400 rpms.
Mean value = (200rpms + 600rpms)/2 = 800rpms/2 = 400 rpms.
2 pulses each millisecond, add some noise and sometimes it is 1 pulse while other
times 3 pulses each millisecond. Multiply by 200 => 200*(1 2 3) = (200, 400,
600).
How many pulses each time value is calculated?
Not relevent, velocity estimation on Hostmot2 firmware calculates velocity
based on the number of counts divided by the time between the counts (the
sample time is not used in this calculation)
Yes it is.
Nope, you did not understand what I posted, the servo thread time is not used
in the velocity estimation with hostmot2 firmware
But you divide by time between samples?
Nope, time between counts
200 = x/(dt = 1/1000 seconds) = x*1000*seconds <=> x = 200/1000 = 0.2 so
velocity = 0.2/dt*(number of counts)
I once visited a seminar with an old man from Analog Devices and had not find a
single case then ohms law did not work.
Regards Nicklas Karlsson
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