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  1. #1
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    Default Choosing right stepper motor

    Hi,

    I do have a trapezoidal spindle TR 20x4. I will need a speed of 200rpm and a torque of 10Nm (>7Nm).

    I am thinking about this stepper motor:
    https://www.omc-stepperonline.com/ge...4004d-sg9.html
    34HS38-4004D-SG9

    The torque should be enougth - but I don't know if 200rpm is possible on the gearbox.
    The stepper motor need than have a speed of 1800rpm.

    Should this work or do somebody have another idea?


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  2. #2
    Member awerby's Avatar
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    Default Re: Choosing right stepper motor

    You didn't say what you're using it for, or why you settled on this particular motor, but if you're making a router to work with wood, I'd call it a bad choice. Wood needs to be cut fairly quickly, or it starts to show dwell marks, and will burn in extreme cases. With a gear-motor, you're trading speed for torque. But since steppers have less torque the faster they try to run, this is an exercise in futility. (Servo motors, which tend to perform best at higher speeds, are better candidates for gear-heads.) The torque curve PDF is missing for that motor, but you can look at torque curves for other steppers and get the idea. Also, at 4.5mH inductance, it really wants about 68v DC to run optimally. Most inexpensive drivers won't be able to handle that much voltage. I'd say keep looking, but build the frame of your machine in the meantime; once it's done you'll have a better idea of how much torque you really need.

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    Default Re: Choosing right stepper motor

    I would say that it's unlikely that you can get that motor to spin at 1800rpm without stalling. I would consider 1000 rpm to be good for a Nema 34 stepper.

    Gerry

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    Default Re: Choosing right stepper motor

    As I am in the EU I found this stepper:
    EU Free Ship Nema42 stepper motor 3256oz.in Driver DM2722A CNC Schrittmotor | eBay

    As I would need 200rpm this is equal to 360°/1,8° * (200rpm/60)== 666 pps
    And the torque curve shows that the drive can handle 10Nm up to 8000pps what is equal to 2400rpm.

    On my calculation the spindle is good to run a maximum speed of 340rpm. So the drive is good enough.

    The project is an pool roof lift:
    Lowo.cz



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    Default Re: Choosing right stepper motor

    That's a very different application than the ones most of us are used to. In this case, your main problem, as I see it, will be to synchronize all these different motors so the pool roof is lifted evenly - if the motors get out of sync, then the thing will jam. But you can use the cheap ball screws that aren't good enough for precision machines...

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    Quote Originally Posted by awerby View Post
    That's a very different application than the ones most of us are used to. In this case, your main problem, as I see it, will be to synchronize all these different motors so the pool roof is lifted evenly - if the motors get out of sync, then the thing will jam. But you can use the cheap ball screws that aren't good enough for precision machines...
    There is only one motor, 4-6 spindles coupled together. Left and right are connected with a belt together. The complete weight of the roof is about 300kg. So on 6 spindles there are only about 50kg. The only problem is the length of spindles. It have to be >2000mm. That is the reason that a TR 20x4 is needed.



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Choosing right stepper motor

Choosing right stepper motor