Re: Transformers and gecko drives

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "callcbm2000" <callcbm@d...>
wrote:

> > I have a machine controller transfomer hooked up to three Gecko

320

> > drivers. My question is would it be wise to hook three transfomers
> to
> > each drive or is this unnecessary. The transformer is hooked to

110

> > volts and puts out 24 volts ac. The amperage I'm not sure as there
> is
> > no rating on the tranformers. The output wire is about 12ga
> wire.The
> > cost of these are not a issue as I have at least 15 Transformers
> the
> > same
>
> Is the single trasnformer getting too hot? Can you keep your hand

on

> it for 3 seconds? If its constantly overloaded it will heat up over
> time. One of the ways to try and determine the output of a
> transformer is to measure the wire. Transformer designers don't
> oversize the wire since even one size larger will often force you to
> use a bigger bobbin and core thereby driving the cost up. #12

should

> take you up to 15 to 20 Amps of current. Another way (really rough)
> is to weigh it and figure about 20 watts per lb. If you know the
> secondary voltage and estimated wattage then you have the projected
> current number
>
> No the transformer stays cool to the touch and its weight would

have

> to be 110 lbs.with the caculation of 20 watts per pound, 20watts
> times 110 volts divided my amps comes to 110 My tranformer weight

is

> 8lbs

24 V X 20A = 480 Watt

8 lbs X 20 = 160W

I doubt your motors are pulling anywhere near the 20A peak.

>
> > The motors are dc and rated top voltage is at 34 this is based on
> per
> > thousand RPM and amperage is at 20 amps.the size or rated torque
> for
> > x-y is peak torque 1.77 N-M rated .353 N-M, z motor is 1.06 peak
> > rated at.212. this info is from Minetia rm dc servos Ugrmem-02 I'm
> > not sure of the OZ -in. But when I run two axis at the same time
> the
> > motors or movement slows down, running one motors it spin faster.
>
> one N-M is equal to 141.6 oz-in
>
>
> > I'm using Master 5 software and maxed the speed I want to up grade
> to
> > mach 1-2 But need bigger computer or Clock speed I'm presently
> > running a amd-k6 3d processor. The machine has ball screw drive

The

> > pitch I'm not sure but one revolution moves .0200 and if I'm right
> > thats 5 turns per inch? I'm seting the machine to do 21/2 d

carving

> > and would like good speed.
>
> .020 pitch is 5TPI
> What are you encoder specs. That will determine the pulse rate you
> will need. What IPM is your target?
>
> 500 pulses per rev and I would like to get about 800ipm speed
>
>

500 gives 2000 in quadrature times the screw TPI (5) gives 10,000
pulses per inch (provided it is direct coupled; no belt reduction)

To move one inch in one second (60IPM) you need 10,000 pulses per
second. To move 120 IPM you need 20,000 per second (higher than
master5). To get to 800 (typo?) ipm you need 133,333 pulses per
second.