584,841 active members*
4,264 visitors online*
Register for free
Login
IndustryArena Forum > CNC Electronics > Stepper Motors / Drives > matching driver to stepper (help)
Results 1 to 2 of 2
  1. #1
    Join Date
    Nov 2018
    Posts
    4

    matching driver to stepper (help)

    I am in the process of designing my CNC wood router. I did my calculations and am comfortable with 380 oz-in steppers, which should give me a factor of safety of ~7. I've found many potential steppers on ebay, but I'm unsure of what other parameters that I need to look at before (1) choosing a final stepper and (2) choosing an appropriate set of drivers.

    Here is what I know:
    1. Lower inductance is better <2.0 mH - but there doesn't seem to be many around with an inductance this low
    2. the motor needs to have sufficient torque at my design RPM. I can read the motor performance charts, but I'm not sure what to do with the "1/2 step" (or other fraction) at the top of the chart - should I derate the torque chart based on this?

    Here is what I don't know:
    1. What do I look for in a driver ( should it be at least the max current of the motor? do I need to look at any other factors?, how to choose between unipolar, bipolar, etc? Is one better than others for CNC applications?)
    2. How to choose a power supply?
    3. I'd like to buy a set of 3 steppers, drivers, and a power supply for ~$200... does this seem reasonable?

    thanks for the help!

    pete in upstate NY

  2. #2
    Join Date
    Mar 2003
    Posts
    35538

    Re: matching driver to stepper (help)

    1) The driver needs to be able to deliver the rated current, and the voltage you plan on using. I'd want a little headroom on the voltage, so I wouldn't run 48V on a 50V rated drive.
    I don't think there are any modern unipolar drives.

    2) According to Gecko, 32 x square root of the motors inductance, in mH. With high quality drives, you can go even higher. The torque chart should have a voltage that it was created at. Higher voltages will give more torque at higher speeds, lower voltages will give less.

    3) High quality drives alone will cost more than that. These are a very cost effective option.

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

    And for larger motors, or higher voltages.

    https://www.omc-stepperonline.com/di...it-dm860i.html

    Here's a slight smaller motor that may actually outperform the 380oz motors you were looking at.

    https://www.omc-stepperonline.com/ne...s45-3008d.html
    Gerry

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

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

Similar Threads

  1. Matching driver and PSu
    By anedic in forum Stepper Motors / Drives
    Replies: 10
    Last Post: 02-19-2018, 12:27 PM
  2. Advice on NEMA42 and matching Driver
    By yafimski in forum Want To Buy...Need help!
    Replies: 5
    Last Post: 08-28-2017, 04:23 PM
  3. simple matching stepper motor to the driver
    By alihureiby in forum Maintenance DIY Discussion
    Replies: 1
    Last Post: 03-19-2017, 06:59 PM
  4. Matching the right driver to the right motor
    By mcrLABS in forum Automation Technology Products
    Replies: 5
    Last Post: 09-11-2011, 05:43 PM
  5. Matching an AC servo to a Driver
    By RP Designs in forum Servo Motors / Drives
    Replies: 10
    Last Post: 04-10-2011, 07:15 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •