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  1. #1
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    Picking a stepper motor

    How do you pick a stepper motor? Not size but manufacture? what are the known good brands and what do you stay away from?
    Thanks John

  2. #2
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    Re: Picking a stepper motor

    Hi,
    what first time buyers overlook is the inductance specification. The windings have inductance and that inductance degrades the motor
    torque at speed. Look for the most powerful (torque) stepper in its size but also the lowest possible inductance.

    For a 23 or 24 size stepper you want 1mH or less if you can and for a 34 size 2mH or less.

    Craig

  3. #3
    Community Moderator ger21's Avatar
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    Re: Picking a stepper motor

    Oriental Motor (Vexta) is one of the top brands.
    Most people buy no brand Chinese steppers, as they tend to be much cheaper, and still perform well.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

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    JointCAM - CNC Dovetails & Box Joints
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    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  4. #4
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    Re: Picking a stepper motor

    I just replaced my Z motor. I had a 1700oz/in 4 wire (nema34) that was loud as heck and slow through resonance (8mh inductance).
    The new one is from Longs on ebay.
    1090oz/in 8 wire (wired parallel) 3.5mh inductance, is near silent and doubled the speed of the other.

  5. #5
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    Re: Picking a stepper motor

    Quote Originally Posted by joeavaerage View Post
    Hi,
    what first time buyers overlook is the inductance specification. The windings have inductance and that inductance degrades the motor
    torque at speed. Look for the most powerful (torque) stepper in its size but also the lowest possible inductance.

    For a 23 or 24 size stepper you want 1mH or less if you can and for a 34 size 2mH or less.

    Craig
    Show me a stepper that is that low?
    On a small budget, a closed loop I can only see as low as 2mh in a nema 23. Even a normal stepper I can only see about 2.5mh. (around the 500oz/in mark)
    The standard nema 34 I just got was 3.5mh in parallel and that took a bit of looking. (around the 1000oz/in mark)

  6. #6
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    Re: Picking a stepper motor

    Can you give some examples. I've not been able to find any in those ranges. Looking for Nema 34 size in 600-1200 oz/in sizes

  7. #7
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    Re: Picking a stepper motor

    Hi,
    this is 23 size:

    Object reference not set to an instance of an object.

    and 1.18mH.

    Craig

  8. #8
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    Re: Picking a stepper motor

    Hi,
    here are three examples (from Leadshine's website), all 34 size.

    The smallest of them at 500oz.in is also the lowest inductance and retains its torque at speed better than its bigger brothers with commensurately higher
    inductance.

    You can have 'big and grunty but not fast' or you can have 'less grunty but really fast' but not both.

    Craig

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