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IndustryArena Forum > WoodWorking Machines > DIY CNC Router Table Machines > Is high inductance ever a good thing in a stepper motor?
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  1. #1
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    Jun 2017
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    7

    Is high inductance ever a good thing in a stepper motor?

    I have a 6040 CNC mill that came with three nema 23-style 76mm steppers with the following stats:

    1.8 step angle
    6.6V
    3A
    2.2 Ohms
    8mH
    17kgcm
    4 wire

    I'm currently using a 24V power supply and the motors stall when I have the speed set above 1400 on Mach3. I've heard this could be because of the high inductance (8mh) of my stepper motors, and was thinking of using a 36v power supply or swapping the motors (or both!)

    Is a motor with a high inductance every helpful in a CNC machine?

  2. #2
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    Quote Originally Posted by FranKrause View Post
    I have a 6040 CNC mill that came with three nema 23-style 76mm steppers with the following stats:

    1.8 step angle
    6.6V
    3A
    2.2 Ohms
    8mH
    17kgcm
    4 wire

    I'm currently using a 24V power supply and the motors stall when I have the speed set above 1400 on Mach3. I've heard this could be because of the high inductance (8mh) of my stepper motors, and was thinking of using a 36v power supply or swapping the motors (or both!)

    Is a motor with a high inductance every helpful in a CNC machine?


    Not even 36v will cure it. I've been there. You need at least 60v. Even then you will get resonance though. You need to swap the stepper for no more than 3mh and should be using at least 45v for reliability (unless you have terrible drivers rated less than 50vmax). . Majority of us run nema 23/24 on 60v at least with DM860 drivers. They go like rockets after that.

    You've been sucked in by the cheeky China man.

  3. #3
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    Jan 2018
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    1097

    Re: Is high inductance ever a good thing in a stepper motor?

    As a follow up to post #2.

    Slightly longer at 82mm
    https://www.omc-stepperonline.com/ne...m%5B76%2C82%5D
    The rest of theres looks a bit crap.

    https://www.omc-stepperonline.com/di...or-dm860t.html
    This driviver version highly reliable

    https://www.aliexpress.com/item/3287...21564678%22%7D
    60v 600w version of this will run 4 motors all day long (search around to see if can find more local first).

    All these combined will see you able to run very rapid.


    If you want to be 'conservative' but quick 'enough' then as an alternative:
    https://www.omc-stepperonline.com/ne...m%5B76%2C82%5D
    Same motors

    https://www.omc-stepperonline.com/di...or-dm542t.html
    Drivers.

    https://www.aliexpress.com/item/3287...21564678%22%7D
    48v 600w version.

    *With 3 of these 4A motors you want a minimum of 8A power supply*.
    10A preferred which will cover up to 4 motors ie: 48v/480w+ or 60v/600w+ or 80v/800w+ etc.

  4. #4
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    Join Date
    Sep 2005
    Posts
    1164

    Re: Is high inductance ever a good thing in a stepper motor?

    https://www.omc-stepperonline.com/di...or-dm860t.html
    This driviver version highly reliable
    I use toroid transformer 62 vac 30A, it is simple and reliable, motors run good ...

  5. #5
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    Jan 2018
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    1097
    Quote Originally Posted by asuratman View Post
    I use toroid transformer 62 vac 30A, it is simple and reliable, motors run good ...
    Excellent supplies for those DM860T drivers.
    Can cost a bit more than switched supplies but you get what you pay for.
    If decent outputs were readily available in the UK I'd be using one.

    If OP gets the drivers and goes as high as 60-65vac or 90vdc supplying them then the motors likely will not need changing.
    Unless the motors create too much resonance in general.

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