RE: [CAD_CAM_EDM_DRO] Re:Taig retrofit

> [What motors are these? Electronic Goldmine doesn't seem to have any
> encoder-motors listed presently (although they have lots of cool stuff).
> Also, I thought you had to have a load on these motors for them to work.]

They are no longer available. Most people bought them for the encoders. They
had 1000 slot and 400 slot encoders mounted on a small (about 1-1/2" dia x
3" motor length) ball bearing 24 v servo motor. They went for around $4 -
$4.50 each.

> [So ideally, the motors should run in the middle of the voltage range?
> Since the drives are rated 18-80 VDC, that would be around 50 volts
> continuously. At 5 amps average draw, that would be 250 watts-
> doesn't that
> make any heat anywhere? I can just put the drives in a closed box with no
> fan and forget about them? Anyway, since you're one of the few who have
> done this, I'd appreciate any words of wisdom you can share on
> setting this
> up, (like how to set up the power supply- there seem to be a lot of ideas
> out there) and any "gotcha"s that might not occur to the inexperienced.]

I don't think I would generalize that they should be run in the middle of
the range. For the motors I was using 72 V was way to high. With motors
rated for that voltage they would have worked fine, but would probably
require some cooling. You do have to be careful if you are running near the
top of the voltage range and put some type of circuitry in place to keep the
over voltage from a motor decelerating rapidly from spiking the drive with a
big back induction spike. Mariss has posted a circuit in the file are to
address this situation.

I use the big honking transformer with a bridge and caps for my supply and
currently use a single supply for all 3 drives.

Tim
[Denver, CO]

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