4 Axis Gecko 203v with 570 OZ Motors what PSU Help

[Don Kellogg]

I'm starting a 4x4 build and I'm going all out 3 1/4 porter, with gecko 203s and 570 motors. But I've run into an issue what PSU should I use for those drivers and motors?

Is this one big enough

http://www.antekinc.com/PS-5N70R.pdf

or should I go with

http://www.antekinc.com/PS-15D70R.pdf

Or maybe something on this page.

http://www.kelinginc.net/SwitchingPowerSupply.html

I'm eyeing this one KL- 7220 Specification: $189/pcs
Unregulated Power Supply 1440W, 72VDC/20A ,120VAC or
230VAC

This is the one area I'm not really sure about. I'm not really too worried about the price just want to make sure I have enough power and a little head room.

[CNCfun&games]

HI
More info req'd to determine PWR Supply spec's.
Please post the Motor Amps, inductance, and qty used.

Regards....W. Smith

[Don Kellogg]

Hope this helps.

4 Motors
4 Gecko 203vs
Not sure of the BOB just yet.

[ger21]

If you wire the motors parallel, you want a 48Volt supply, and about 4 amps per motor will give you a little headroom. Parallel will give the best performance.

[Crevice Reamer]

All of the power supplies that you list are too large for those motors. The motors best voltage is around 49 volts. The Keling KL-5020 should be fine.

CR.

[CNCfun&games]

Jerry & CR are right!!!

Here are the calculations so you can verify your assumptions.
Current: 5A x 4 motors=20A x .67% =13.4A
Vmax(Motor)=(SQ RT of Inductance) x 32=1.516 x 32= 48.53Vmax.

In some cases the Pwr Supply Capacitors may not be sufficient for your application.
so check total Cap, against this formula.

Capacitor Selection:C=(80000. x 13.4A)/48.53V = 22089uF

Good luck....W.Smith

[Crevice Reamer]

I should have mentioned that, (Because steppers at rest are drawing current and this lowers the output voltage somewhat.) with three or four motors connected--NO individual motor will receive more than 48V from the 50V power supply.

CR.

[ifeliciano]

Originally Posted by CNCfun&games Jerry & CR are right!!! Here are the calculations so you can verify your assumptions. Current: 5A x 4 motors=20A x .67% =13.4A Vmax(Motor)=(SQ RT of Inductance) x 32=1.516 x 32= 48.53Vmax. In some cases the Pwr Supply Capacitors may not be sufficient for your application. so check total Cap, against this formula. Capacitor Selection:C=(80000. x 13.4A)/48.53V = 22089uF Good luck....W.Smith

Resurrecting....So to drive the Green Monster stepper from Probotix with Gecko 203's, I'll need an 83V power supply ?

6.8mH inductance

[Crevice Reamer]

Yep! The Green monster is not very efficient.

What is it that you want to power with your motors?

CR.

[ger21]

Yep, that's correct. If I recall correctly, the motors Probotix sells have rather high inductance. This is because they are low current motors to work with their lower current drives.
The best performing motors have high current and low inductance.

[ifeliciano]

Originally Posted by Crevice Reamer Yep! The Green monster is not very efficient. What is it that you want to power with your motors? CR.

Im looking into Joe's 4x4. Have not bought plans yet. I want to get the electronics chosen and built first.
Would like to use the Gecko 203 drivers and have a 48VDC 15amp P/S.

Any recommendations on motors ?

[Crevice Reamer]

You haven't said anything about how you are going to drive the axes so this could change but generally you can probably use a G540 controller, 270 oz N23 motors for X and Y, a 387 oz motor for Z and a 48V 7.3A power supply.

$299 G540 http://kelinginc.net/GeckorDriver.html
$078 Two $39 KL23H276-28-4B 270 oz motors for X & Y
$049 One KL23H284-35-4B 387 oz motor for Z
$060 One KL-350-48 48V/7.3A power supply.
$010 Estop switch
$007 3 Home switches
$009 Straight thru parallel computer cable.
-----
$502 Total electronics cost.

$149 Mach3 cost with above purchase.

$651 To spend at Keling. http://kelinginc.net/

This most likely will be the best electronics for your router.

Start by reading this:

http://www.cnczone.com/forums/showthread.php?t=76865.#3

CR.