power supply ???

[DanOSB]

ok i have some questions here...

2 of my motors require 24 volt.. one of them only needs .67 amps and another needs 2 amps

specs about power supply..
Output 24 volt Amp regulated low ripple filtered. 4 Amp constant 5 AMP surge. Electronic overload protection with instant automatic reset.

do i have to add resistior for each of the motor or the driver will reduce the amp to the amount of the amp the motor will need or?? or it will overload the motor or i have to get seperate power supply for each of them cant i wire them in parallel

im no expert in wiring stuff.. so any help would be apprecicated

[ger21]

I'm assuming these are steppers.? What drives are you using?

[DanOSB]

yup steppers and the drivers for those two will be
http://www.electronicutopia.com/cont...d=38558.914583

and ger21 thanks for your quick reply again

[ger21]

Since they don't have any info on their site unless you're registered, I can't say for sure. But I have a feeeling you'll need resistors.

[DanOSB]

wierd im not registered.. try go to http://www.electronicutopia.com/ then click on Hobby CNC Supplies then click on Stepper motor Controllers and IC's then go on second one (bipolar one) or this url on ebay would be better for ya

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWN%3AIT&rd=1

[ger21]

Quoted from the link you posted:

"They do not chop (No PWM) so exact motor voltages would be required or use ballast resistors with larger voltages."

[DanOSB]

ok so that power supply will work all i need to get is right wire size and resisitor then i can use that power supply correct..

im serioously a idiot for electronic stuff.. .. trying to learn as i go thru..

[DanOSB]

also one more thing.. am i susposed to have exactily 2 amps if the motor is rated for 2 amps or should i have 1.9 amps to be safe?

[pminmo]

DanOSB,
Have you checked the steppers at automationdirect:
http://web5.automationdirect.com/adc...ors_-z-_Cables

And you understand the electonicutopia driver is not a current limited driver?

[ViperTX]

Without PWM...I would avoid those drivers.....pick the Xotoplex or one of the others in this website's forum....you'll be better off.

[DanOSB]

what does pwm means?

i have been lookin at steppers on ebay.. i already have one but still planning on buying another.. i dont mind adding resisitor myself.. so that would be fine correct? or am i missing something else?

[One of Many]

Originally Posted by DanOSB ok i have some questions here... 2 of my motors require 24 volt.. one of them only needs .67 amps and another needs 2 amps specs about power supply.. Output 24 volt Amp regulated low ripple filtered. 4 Amp constant 5 AMP surge. Electronic overload protection with instant automatic reset. do i have to add resistor for each of the motor or the driver will reduce the amp to the amount of the amp the motor will need or?? or it will overload the motor or i have to get separate power supply for each of them cant i wire them in parallel im no expert in wiring stuff.. so any help would be apprecicated

Since the sum of the voltage drops are equal to the supply, no "series resistors" would be needed considering the supply is not over 24v. Depending on how the phase windings are driven from the transistors, will the full 24v actually end up on the winding or is some of that voltage absorbed by the transistors? Any ballast resistor will only add to the voltage drops and leave less for the motor.

I would not expect these stepper motors to pull more current than they are capable of at slip/locked rotor rating?, but....If we can state that the winding resistance of each motor phase were less than E(24v)/I(limit of 2A or .67A respectively), which would pull a current beyond the max the motor can handle. Then, shouldn't some other form of current limit must be handled in the transistor drive circuits without effecting the voltage? Obviously, large variances to watts via P=I x E will effect motor or driver performance in the system. Getting it running may be more of a priority than worrying about theory, but it is beneficial to learn how the system should work as a whole to keep the magic smoke where it belongs.

2Amps + .67Amps + how many amps to run the board itself?

If this is the only supply, it seems like the 4A is getting consumed to leave some surge, but it would be nice to know how conservative these claimed accumulated current draws match the actuals with the available supply. Not that anyone would exaggerate on product specs....er anything like that? Heheh!

The statements of not microstepping and not PWM are part and parcel of the Unipolar drivers, yet not directly disclosed for the Bipolar ones mentioned.

I'd like to learn a bit more on this stuff too. I may be raising more questions than answers. No intended! LOL!

DC