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  1. #1
    Join Date
    Apr 2005
    Posts
    85

    What's the difference?

    What's the difference between an AC and a DC stepper?

    I was at the local salvage store today and found some Slo-Syn SS91 AC Syncrohous Stepper motors. I bought one for the motor mount and hardware attached. I found this link that lists the specs for the motor but I don't think I've read anything about AC steppers. Any help would be appreciated.

  2. #2
    Join Date
    Mar 2003
    Posts
    35538
    AC synchronous steppers run at a constant speed of 72rpm. Not suitable for a cnc.
    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)

  3. #3
    Join Date
    Apr 2005
    Posts
    85
    Gotcha! Thanks. At least the Nema23 mount is good. Just curious, what would one do with such a motor? Maybe a small turntable for DIY 3D Imaging?

  4. #4
    Join Date
    Dec 2003
    Posts
    24216
    Quote Originally Posted by ignatz
    Just curious, what would one do with such a motor?
    They are often used in assembly line operations and processes because of their synchronization to the incoming supply 72rpm for 60hz or 60rpm for 50hz.
    They have identical construction to 'DC' steppers, also like a stepper they have good holding torque at zero speed and they can be held in position when the AC is removed by injecting a DC voltage into the windings.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  5. #5
    Join Date
    Aug 2004
    Posts
    2849
    And of course the obvious....one is AC and the other is DC...

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