One single 10 amp power supply should be fine.
Hello everyone,
that's my first post on CNCZone and as I was not able to find an adequate answer within the forum
to solve my doubts, I'm posting the following, in the hope I'm writing on the correct area.
I'm trying to build my first 3 axis cnc router and I'll employ 3 closed-loop motor+driver to move the machine.
Precisely, I'm thinking to use a kit as of the one in the following picture for each axis:
http://www.cnczone.com/forums/attach...d=354318&stc=1
The motor should have the fallowing features:
Rated voltage/current 4.52V/4A
resistance 1.13ohm
Inductance 3.6mH
Hold torque 3NM
Now, I'm really in trouble trying to figure out what should be the requirements to correctly power these 3 motors.
As stated in this article: Power Supplies – CNC 4 Everyone I should consider the following formula to estimate the correct absorption of current:
Current = Amps needed per drive * Number of drives *0,7
which leads me to a power supply able to provide at least: 8,4A.
As I've found that some users suggests to use at least one power supply of 48V - 7,5A for each motor/driver unit, thus 3 separate power supply, it will be really appreciated if someone with more experience with closed loop systems can bring me on the right path.
Thank you very much for reading my post and eventually for the info You'll provide.
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Last edited by rebeldevil; 03-10-2017 at 09:24 PM.
One single 10 amp power supply should be fine.
Gerry
UCCNC 2017 Screenset
[URL]http://www.thecncwoodworker.com/2017.html[/URL]
Mach3 2010 Screenset
[URL]http://www.thecncwoodworker.com/2010.html[/URL]
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[URL]http://www.g-forcecnc.com/jointcam.html[/URL]
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Thank you very much for your answer. You've provided a link to a 15V power supply. Don't you think this is too low voltage?
Last edited by rebeldevil; 03-10-2017 at 09:28 PM.
I didn't provide any links.
It was probably an auto generated link from the forum...
Gerry
UCCNC 2017 Screenset
[URL]http://www.thecncwoodworker.com/2017.html[/URL]
Mach3 2010 Screenset
[URL]http://www.thecncwoodworker.com/2010.html[/URL]
JointCAM - CNC Dovetails & Box Joints
[URL]http://www.g-forcecnc.com/jointcam.html[/URL]
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
You mention closed loop, are those steppers or servo's, the voltage appears too low for typical servo?
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
Sorry ger21, anyway thank you for your answer.
Last edited by rebeldevil; 03-10-2017 at 09:27 PM.
I think you need a stepper motor instead of a servo motor, servo motors are best for laser/plasma CNC applications that doesnt require hold torque on the shaft, on the other hand on a 3 axis CNC mill the stepper motors are the best for the milling applications because it can steadily hold it`s postion when in Z motion, closed loop motors tend to mis allign the X and the Y axis during the Z down motion because when at rest the motors have more likely have lesser hold torque on the shaft itself compared to the steppers that completely hold it`s position during the Z axis operation, I may be wrong but that`s what I observed.
Can I ask a question sir? if you rotate the shaft on that motor does it have steps? or no? because if it does it`s a stepper type, but if it`s smooth it`s a closed loop type, either way if the rated voltage on that motor type is 5V then I guess you can use a computer power supply on that one and it`s safer too because a typical PS unit on a PC can just shutdown if over current occurs, most PC power supplies nowadays have a rated 30-50 amp on the 5V side depending on the model, and yes I encountered low voltage stepper motors back in the days when I was still in high school, and I find them a bit laggish when turning compared to the 48VDC type that is more snappier and quicker to react on the codes.
Hi Sir., I was able to ask the seller and He says that the motor is a simple stepper one but, obviously, with encoder on the back side.
I've found a similar model from another seller which reports on the driver case an input voltage between 24-50 V.
I've haven't got one in my hand actually, anyway thank you for sharing your experience.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.