Re: [CAD_CAM_EDM_DRO] Re:Encoder Velocity Est. - was re:GeckoDriv es.....

John,

Sounds interesting. Could you keep us posted on your progress?

Tom Eldredge

----- Original Message -----
From: John Craddock <johncrad@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, March 24, 2001 9:40 PM
Subject: RE: [CAD_CAM_EDM_DRO] Re:Encoder Velocity Est. - was re:GeckoDriv
es.....


> Ray, there are a couple of references on the Texas Instruments web site in
> the motor control section search for spra363, spra415 and spra416. These
are
> pdf app notes for the TMS320 series DSPs. Actually I am not playing with
the
> TI TMS320F240 motion control chip but porting some of their assembly
> language routines to the Analog Devices ADMC401 chip. I have this demented
> idea that I can build up a cheap AC servo from an auto alternator by using
> these chips for electronic commutation using space vector modulation that
> these chips are really designed for. These chips have a built in
quadrature
> encoder and 3 phase programmable PWM driver that I will use to drive an
> International Rectifier IRPT1058 power driver module.
> Regards
> John Craddock
>
>
> > -----Original Message-----
> > From: Ray [mailto:rehenry@...]
> > Sent: Wednesday, March 21, 2001 11:15 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Re: RE: Re: Re: Re: GeckoDrives..
> > Can anyone
> > Help?
> >
> >
> >
> > John
> >
> > I saw a paper on this a year or ago. The authors built a small
> > board to sit near the encoder and create a velocity signal
> > from the pulse
> > train. Do you know of any systems using this approach?
> >
> > Ray
> >
> > From: John Craddock <johncrad@...>
> > Subject: RE: Re: Re: Re: GeckoDrives.. Can anyone Help?
> >
> > One can go to very low speeds with coarse grained encoders by
> > swapping from
> > pulse count to measuring the time interval between pulses
> > below a set pulse
> > repetition rate.
> >
> >
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> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
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