Newbie Power Supply Size?


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Thread: Power Supply Size?

  1. #1
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    Question Power Supply Size?

    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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  2. #2
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    Default Re: Power Supply Size?

    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.



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    Default Re: Power Supply Size?

    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

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    Homann Designs - http://www.homanndesigns.com


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    Member phomann's Avatar
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    Default Re: Power Supply Size?

    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

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    Homann Designs - http://www.homanndesigns.com


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    Default Re: Power Supply Size?

    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!!



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    Default Re: Power Supply Size?

    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



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    Default Re: Power Supply Size?

    Quote Originally Posted by john-100 View Post
    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!?



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