Re: [CAD_CAM_EDM_DRO] Re: Mariss' power supply circuit

If memory serves... demag current is usally 2-10 times the peak rated
current of the motor depending on magnet type used. I have never seen amp
used that would/ or could supply these levels. Would be a massive over kill
with no functional gains prodused, or in othere words Les Watts would do.


John H. Berg
Berg Engineering, LLC
1133 Kensington
Grosse Pointe Park, Michigan 48230

Phone: (313) 999-1227
Fax: (313) 881-6421
E-Mail: berg1133@...

----- Original Message -----
From: "Les Watts" <leswatts@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, June 18, 2002 10:33 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Mariss' power supply circuit


> Demagnetization-
> Well that is one reason my estop shorting resistor is 5 times the armature
> resistance.
> It is enough to stop the motor in the space I need to stop it, but no
more.
> My peak servo current is speced at 26 amps per axis.
>
> In a non estop deceleration my amp maker advises me that I will have
> the potential for a large power supply regeneration voltage
> rise with their product.
> I wouldn't call it a common problem as most folks here are not
> doing quick 600 ipm stops of 800 kg effective mass. But I am!
>
> Another manufacturers description is here:
> http://www.idcmotion.com/pdf/8403.pdf on page 2.
>
> anyway the circuit will take care of that and inductive energy too.
> 5 joules of the 25 I mentioned is due to motor inductance.
>
> You ought to see the big gantry in a controlled rapid stop.
> It zips along and then makes kind of a "bong" sound
> on stopping like someone hit it with a hammer. I think I
> am getting EMC tuned up pretty well!
>
> Oh I have to tell you a very short story... about 15 years
> ago I invented a car side mirror defroster that uses a
> positive temperature coefficient polymer resistor I developed.
> After it melts the ice and warms the resistance rises, and
> it powers down and uses LESS WATTS haha!
> We have even sold a couple of them.
>
> Les
>
>
>
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