RE: SV: [CAD_CAM_EDM_DRO] Re: breakout boards plus - hard choice

Yes I know I got confused Jon.



Dr. Mark Vaughan Ph'D. B.Eng. M0VAU

Managing Director

Vaughan Industries Ltd, reg in UK no 2561068

Water Care Technology Ltd, reg in UK no 4129351

Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
Phone/Fax 44 1872 561288

RSGB DRM111(Cornwall)

_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Jon Elson
Sent: 21 July 2007 03:18
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: SV: [CAD_CAM_EDM_DRO] Re: breakout boards plus - hard choice



Henrik Olsson wrote:

> Hi guys,
> Here's the message Mariss posted on his Yahoogroup on may 28 2007. I think
> it will provide answers to some of your questions.
>

Thanks for the memory refresh :

> A month ago I came to the conclusion the approach I had been working on

for

> two years wouldn't and frankly never could work. It was to tweak the step
> and direction inputs on an encoder feedback closed-loop step motor drive

to

> get the performance the motor can have closed loop.
>
> This revelation suggested the key to the solution is to make the motor

drive

> self-commutating. This is not in itself an unknown practice though it is a
> little obscure. It is obscure only because it in turn requires phase-lag
> compensation that no previous implementation has satisfactorily solved. I
> have come up with a simple closed-loop solution that is patentable and I
> have it running on the bench right now.

<snip>

>
> The drive is unharnessed right now. I will be putting a harness on it to
> control its speed and position. The method is patentable as well. A cool
> feature of the method is with an encoder the drive is closed-loop with all
> the features described. Without an encoder it's just another really nice,
> ordinary Clark Kent kind of microstep motor drive.

So, I think different memories this were BOTH right, but that it
needs the encoder to be stall-proof.

Jon





[Non-text portions of this message have been removed]