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)
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Peter Wallace
Mesa Electronics
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