Duet3D Logo

    Duet3D

    • Register
    • Login
    • Search
    • Categories
    • Tags
    • Documentation
    • Order

    Unipolar/bipolar steppers.

    Duet Hardware and wiring
    3
    15
    1956
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • Deluxe 600
      Deluxe 600 last edited by

      Hello i have quite a problem here. I ordered 6 steppers from aliexpress. but when they came i discovered 4 of these are bipolar and 2 are unipolar.
      Now my question is, is it possible to make the board work with 4 unipolar and 2 bipolar steppers? Thank you and have a nice day.

      1 Reply Last reply Reply Quote 0
      • dc42
        dc42 administrators last edited by

        If your unipolar motors have 6 wires (not 5) then you can use them as bipolar motors by leaving the two centre tap connections not connected. However, unipolar motors are often designed to run at higher voltages than typical bipolar motors, and that may make them unsuitable.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

        1 Reply Last reply Reply Quote 0
        • Deluxe 600
          Deluxe 600 last edited by

          Hello thanks for fast responce. Sorry let me be more specific . I have two 6 wire 1.6amp unipolar motors (17HS4401) i was unable to find the voltage ratings. And four 4 wires 2.5amp bipolar motors (42BYGHW811B). My question is , can i use all of these 6 motors (2 of the unipolar in paralel for Z axis) on one board? OR am i screwed? Because i cant imagine trying to return something to China. Thank you very much and have a nice day.

          1 Reply Last reply Reply Quote 0
          • Deluxe 600
            Deluxe 600 last edited by

            Forgot to add that the 42BYGHW811B bipolar motor has a rate volatage of 3.1volts.

            1 Reply Last reply Reply Quote 0
            • dc42
              dc42 administrators last edited by

              Yes you should be able to use all of those motors.

              Duet WiFi hardware designer and firmware engineer
              Please do not ask me for Duet support via PM or email, use the forum
              http://www.escher3d.com, https://miscsolutions.wordpress.com

              1 Reply Last reply Reply Quote 0
              • Deluxe 600
                Deluxe 600 last edited by

                Well i finally got to trying out the unipolar motors. I cant seem to make them work. Do i have to change something in the software side of things to make it work? So far the steppers just shake in one place.
                Thank you for help

                1 Reply Last reply Reply Quote 0
                • dc42
                  dc42 administrators last edited by

                  @Deluxe:

                  Well i finally got to trying out the unipolar motors. I cant seem to make them work. Do i have to change something in the software side of things to make it work? So far the steppers just shake in one place.
                  Thank you for help

                  That usually means the phases are not connected in the correct pairs. How have you connected them to the Duet?

                  Duet WiFi hardware designer and firmware engineer
                  Please do not ask me for Duet support via PM or email, use the forum
                  http://www.escher3d.com, https://miscsolutions.wordpress.com

                  1 Reply Last reply Reply Quote 0
                  • Deluxe 600
                    Deluxe 600 last edited by

                    Well i did it the same way as with the other bipolar steppers. But whatever combination i use doesnt seem to work.

                    1 Reply Last reply Reply Quote 0
                    • Deluxe 600
                      Deluxe 600 last edited by

                      And they worked fine. But the unipolar doesnt strangely. I have no experience with unipolars, i bought it by mistake but cant return it.

                      1 Reply Last reply Reply Quote 0
                      • Dougal1957
                        Dougal1957 last edited by

                        this may help

                        https://www.circuitspecialists.com/blog/unipolar-stepper-motor-vs-bipolar-stepper-motors/

                        1 Reply Last reply Reply Quote 0
                        • dc42
                          dc42 administrators last edited by

                          @Deluxe:

                          Well i did it the same way as with the other bipolar steppers. But whatever combination i use doesn't seem to work.

                          You haven't answered the question in a way that gives me enough information to make a suggestions. What I need is:

                          1. A link to the motor datasheet;

                          2. A photo of how you have connected them, or at least a description of the order in which you have connected the wires to the Duet's connector (assuming that the wires come straight from the motor, not from a connector on the motor).

                          Duet WiFi hardware designer and firmware engineer
                          Please do not ask me for Duet support via PM or email, use the forum
                          http://www.escher3d.com, https://miscsolutions.wordpress.com

                          1 Reply Last reply Reply Quote 0
                          • Deluxe 600
                            Deluxe 600 last edited by

                            Hello.
                            1.This is the link to the motors datasheet : https://www.ebay.com/itm/wantai-1pc-Nema17-Stepper-Motor-70OZ-IN-2-5A-42BYGHW811B-Dual-shaft-worldwide-/222067054625

                            2.I dont know how to add a photo but i did the wiring the same way as here: http://reprap.org/mediawiki/images/thumb/d/d7/Duet_0.8.5_Duex4_wiring_0.2.svg/640px-Duet_0.8.5_Duex4_wiring_0.2.svg.png

                            Motor just shakes in place but doesnt move.

                            1 Reply Last reply Reply Quote 0
                            • dc42
                              dc42 administrators last edited by

                              The eBay link you gave is to a bipolar stepper motor, but you said that the problem you are having is with a unipolar motor.

                              Duet WiFi hardware designer and firmware engineer
                              Please do not ask me for Duet support via PM or email, use the forum
                              http://www.escher3d.com, https://miscsolutions.wordpress.com

                              1 Reply Last reply Reply Quote 0
                              • Deluxe 600
                                Deluxe 600 last edited by

                                Yeah i was mistaken. I did think it was unipolar, does that make it unusable?

                                1 Reply Last reply Reply Quote 0
                                • dc42
                                  dc42 administrators last edited by

                                  Bipolar stepper motors are the correct sort to use. Suggestions:

                                  • Check that you have the wires in the correct order, i.e. black and green at one end of the connector, and red and blue at the other end;
                                  • Check that the crimp connections on the connectors are good, using a multimeter if you have one;
                                  • If the above checks pass, try a different motor output in case you have a blown driver.

                                  Duet WiFi hardware designer and firmware engineer
                                  Please do not ask me for Duet support via PM or email, use the forum
                                  http://www.escher3d.com, https://miscsolutions.wordpress.com

                                  1 Reply Last reply Reply Quote 0
                                  • First post
                                    Last post
                                  Unless otherwise noted, all forum content is licensed under CC-BY-SA