Could someone check out my setup and tell me if It will work?

[radicooldude]

Can someone tell me if this will all work? I will have 3 drivers/steppers and 1 power supply driving them all. How bad would the performance be if I drive the steppers with 15v? Will a regulated power supply mess my stuff up, or will it work ok?
Ok, here the stepper motors drivers:
http://www.electronickits.com/kit/co...tor/ck1406.htm
Bipolar 6amp drivers. 5-50v dc for motor.

Stepper Motors:
P21NSXS-LSS-NS-07
PowerMax 2 (2.3 A) Vs(DC):65V Po:35W, w:1500 RPM

Powersupply:
15v 20A Regulated Powersupply (Originally made for ham radios)

Thanks for any help. - Zack

[ViperTX]

If the steppers actually have 65 volt coils then the 15 volt power supply may not even turn them.

[radicooldude]

Well, I have heard that Pac-sci rates their motors at MAX volts. Can anyone confirm this? I am guessing the motors actually run at 5~6 volts.

[abasir]

Full info here http://www.xylotex.com/DoubleStepper.htm

[H500]

If you use the electronickits drive, You will need big expensive resistors to limit the current. You also won't get much power out of the motors with just 15v.

[radicooldude]

Where can I find those resistors? Are they a certain type? I thought I read that they were like 2 bux each. Can you point to where I can find these resistors? Thanks -Zack

[ger21]

Originally Posted by radicooldude Well, I have heard that Pac-sci rates their motors at MAX volts. Can anyone confirm this? I am guessing the motors actually run at 5~6 volts.

65 is the Max. Find your motors in here, http://www.xylotex.com/PacSciDS.pdf and the voltage is current (amps) x resistance (ohms)

[H500]

Digikey has the resistors. The power rating will depend on your power supply voltage. I think they'll cost more than $2 for the size you'll need.

[brucesu1]

My stepper power supply is 35 volts. Anyone of a number of people could probably provide some good advice for your system on the mach support group. Hope that helps a little.

[irving2008]

Originally Posted by radicooldude Can someone tell me if this will all work? I will have 3 drivers/steppers and 1 power supply driving them all. How bad would the performance be if I drive the steppers with 15v? Will a regulated power supply mess my stuff up, or will it work ok? Ok, here the stepper motors drivers: http://www.electronickits.com/kit/co...tor/ck1406.htm Bipolar 6amp drivers. 5-50v dc for motor. Stepper Motors: P21NSXS-LSS-NS-07 PowerMax 2 (2.3 A) Vs(DC):65V Po:35W, w:1500 RPM Powersupply: 15v 20A Regulated Powersupply (Originally made for ham radios) Thanks for any help. - Zack

Dont know if you got any real answer to your question but that motor driver has no current limiting so you will need dropper resistors.

You can wire those motors as bipolar-series or bipolar-parallel, however the P21NSXS variant is not listed, probably a special. From the other web info tho we know they are 3.34V in bipolar parallel giving a coil resistance of 1.44ohm (2.88ohm per individual coil and 5.76ohm in series)
In series form the rating is 1.16A, 5.76ohm i.e. 6.68voperation
In parallel form its 2.32A, 1.44ohm i.e. 3.34v

for a 15v supply you will need (per phase winding) the following resistors:

Series (15v - 6.7v)/1.16A = 7.1ohm (6.8 or 7.5 are nearest standard size) rated at (15 - 6.7) * 1.16 = 9.6W (use 20W)

Parallel (15 - 3.3)/2.3 = 5ohm (5.1 is nearest, or use 2 x 10 in parallel) rated at (15 - 3.3) * 2.32 = 27W (use 50W - or 25W if using 2 x 10 in parallel)

IMHO the latter is a no-no, you'd be burning up >120W of heat. Even the series wound solution isnt ideal... burning up >50W. Those babies are going to get quite warm - some fan cooiling needed maybe - and a good bit of your power supply output is just being wasted as heat.

Basically with those motors you have 2 options:
1/ use a 5v supply (and then redo the resistor calcs as above)
2/ get a decent motor driver that has either chopper or PWM current control and run them as bipolar-parallel for best performance. They will work ok on 15v but for best performance you'd really want a higher supply voltage of around 45v max (assuming ~2.5mH coil inductance as per data sheet).

I'd go for option 2...

[ger21]

Originally Posted by irving2008 In parallel form its 2.32A, .62ohm i.e. 3.3v

There's a math error somewhere. 2.32 x .62 = 1.44 Volts, not 3.3V.

[irving2008]

Originally Posted by ger21 There's a math error somewhere. 2.32 x .62 = 1.44 Volts, not 3.3V.

you are right... i did the original calcs using the type C stepper then realised it wasnt that one... I'll go edit the calcs above