Power Supply Size?

[pbrgle1]

Hi,

I just got new stepper motors for my DIY router and I'm a little confused how large the power supply has to be. I'm planning on getting a 36V power supply.
How many amps should i get in case all 4 motors are at full load? I can't find an explanation how to roughly calculate the power draw of stepper motors.

I have 4 motors (2x on the X axis)
https://www.omc-stepperonline.com/ne...s45-4204s.html

And these are the stepper drivers.
https://www.omc-stepperonline.com/ne...l?search=M542T

Thanks!

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[dazp1976]

Normally if you get these similar type 4 axis kits from China you're given 2 psu's to these specs:
https://www.ebay.co.uk/itm/1PC-CNC-R...gAAOSwpLxcei4k

(1 supply per 2 motors/drivers).

You can run these nema 23 kits on 48v supplies if wanted as well.

[phomann]

To calculate current requirements for a stepper motor multiply the motors rated current by 2/3.

So, you’re motor is rated at 4.2A. Multiplying it by 2/3 gives 2.8A per motor.

If you plan to use 3 motors that’s a total of 8.4A. For 4 motors that’s 11.2A

Cheers

Peter


Sent from my iPhone using Tapatalk Pro

[phomann]

You could use a single 48v 12A supply such as;
https://www.homanndesigns.com/index....roducts_id=288

Cheers
Peter


Sent from my iPhone using Tapatalk Pro

[dazp1976]

Depends on the budget as well. The Meanwell are nice but for half the cost you can buy 2 of these:
https://www.ebay.co.uk/itm/AC-110V-2...AM6BF6r8RrwhVg
Import the Chinese 48v 7.2A 360w version for £21.00 each. Spot on, and I bet they'll put it down on the customs form as a $10 cost!!

[john-100]

if you use this from Geckodrive.com's web site to select your supply voltage

see
https://www.geckodrive.com/support/s...ly-basics.html

32 * ?L = VMAX

with your stepper motor with an inductance of 3,8mH

your looking for a supply voltage of 32 * 1.95 = VMAX = 62V

to avoid limiting the maximum speed you can step the motor

that requires a more expensive stepper driver


if you can find a stepper motor closer to 2.6mH to 2.8mH then a 48V supply will be OK



John

[dazp1976]

if you use this from Geckodrive.com's web site to select your supply voltage

see
https://www.geckodrive.com/support/s...ly-basics.html

32 * ?L = VMAX

with your stepper motor with an inductance of 3,8mH

your looking for a supply voltage of 32 * 1.95 = VMAX = 62V

to avoid limiting the maximum speed you can step the motor

that requires a more expensive stepper driver


if you can find a stepper motor closer to 2.6mH to 2.8mH then a 48V supply will be OK



John

This is when seeing some of these Chinese sellers flogging 23 sized motors with an inductance of 6.6mH and above leaves me scratching my head!?