Re: Xylotex / RapidSyn/ Power Supply help?

Hi David,

simple, cheap and easy

Wal-Mart car battery charger, no automatic features. simpleset unit
they have. will also be the cheapest.

That will get you a transformer and since you have the option on your
steppers, you can use the low power wiring connection. (more in a bit)

assumeing it is 12 volt, you will only get about 17 volts out of
this, a bit low for the drivers, but enough to see everything work.

The Xylotex drivers are set for 35 VDC MAX TOTAL VOLTAGE. that
INCLUDES the return voltage when your motors are spinning down. you
are good to go with up to bout 30 volts DC. That means you would
need to find a 21 volt AC power supply. not too common.

you need some capacitors. 15,ooo uf low side, 20,000uF high side.
get them rated for 50 volts. Jameco has 10,000uF units 50V for $5.00
each.

a note here is that the Xylotex drivers max out at 35 VDC, so 50 V
caps are perfect. AND if and when you get a little more voltage,
your cap uF will go down. it is inverse to voltage. so you will use
those caps regardless of transformer.

Output of the battery charger into the caps and then on to the driver
board.

that is your power supply.

Check the ohm's on your steppers.
seperate the wires and then spin the shaft.
touch 2 wires and spin the shaft. do that until the motor locks up.
mark those 2 wires. use one and test the remaing 4 until another
locks up the shaft.

then get an ohm meter and test those 3 wires. you will get 2 that
have a high resistacne and one that is common. that common will get a
lower resistance for when you test it with either of the other 2.

example: wire 1, 2 and 3
1 and 2 show 4 ohms.
1 and 3 show 2 ohms and
2 and 3 show 2 ohms.

tape off wire 3.

do the same for the other 3 wires.
example wires A,B and C

C and A are 2 ohms
A and B are 2 ohms
B and C are 4 ohms.
tape off wire A.

your steppers are now set for low power, serial wiring.
the steppers will not run as fast as if you used
one of the low ohms wires, but this is easier to set up.
This also means HALF of the rated amps, so set your driver board for
1.25 amps per motor.

wires 1 and 2 are for one phase and wires B and C are for the other
phase.

Check what else you might need for control wires, but at this point
your driver board and motor is ready to go.

if you need the wires from the computer for step and direction, THAT
is a whole different matter.

If you need that, let us know.

Dave















--- In CAD_CAM_EDM_DRO@yahoogroups.com, "volitan712003
<volitan@o...>" <volitan@o...> wrote:

> I just got my xylotex 3 axis driver board in the mail today. I also
> have 3 RapidSyn motors, 2.5v, 2.5amps.
>
> I used the search function on the board to determine what kind of
> power supply to use, honestly, I'm lost again. Rectifiers, uF's,

Caps

> and regulated, unregulated my head is spinning.
>
> Can someone dumb this down for me? I want to know if I can go to

the

> Radio Shack and get a "Wall Wart" (figured that one out on my

own:) )

> To drive these things? I won't require a lot of torque from them,

as

> for now they'll (hopefully) just be spinning freely on my desk.
>
> Also, months ago, I had a web site bookmarked that would help me
> figure out the wiring on the stepper motor. It told you where to

put

> your meter to figure out what wire was most likely what, to get you
> started. Anyways it's a dead link now. The xylotex has 4 places for
> wires, the motor has 6 wires.
>
> Humbly,
> David