On Tue, 1 Apr 2008, Tony Bussan wrote:
> Date: Tue, 1 Apr 2008 17:10:13 -0500
> From: Tony Bussan <[EMAIL PROTECTED]>
> Reply-To: [EMAIL PROTECTED],
> "Enhanced Machine Controller (EMC)" <[email protected]>
> To: [email protected]
> Subject: [Emc-users] HAL Tachometer emulation
>
> For a number of reasons, I would like to exclusively use an encoder for
> feedback on my DC servo motors. My amps have analog velocity feedback that
> originally came from tachos on the motors. Would it be feasible to use
> something like a Motenc Lite card to get the encoder counts, calculate axis
> velocity and output the analog signals with acceptable performance? I'm
> worried about lag and response time. Even if I can't run at full speeds,
> would this be good enough to have a functional machine and to make sure my
> 30 year old drives still work?
>
> Thanks,
>
> Tony
>
>
I think this just requires another analog output. The driver already
outputs a velocity signal.
In Hostmot2, this Velocity signal should be better than the old
HostMot, as it will be calculated using an inverse time velocity estimator.
The inverse time velocity estimator uses both the number of counts and time
between quadrature edges rather than just quadrature counts to estimate
velocity. Using only the counts/sample to estimate velocity gets crunchy at
low velocities where then count/sample numbers get small, or worse get like:
1,0,0,1,0,0,0,1.....
Peter Wallace
Mesa Electronics
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