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how can we drive a 6 wire stepper motor by 4 wire driver like a4988

Discussion in 'Motors' started by nima, Jul 15, 2016.

  1. nima

    nima New
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    Hi.
    Sorry for english writing .
    I have about 10 stepper motor that they are 6 wire but my driver just have 4 wire to connect .
    how can i use the steppers.
    stepper motor: 1.8 deg / 1.7 a / TYPE 103H7121-1741 sanyo denki.

    thanks for helping
     
  2. Joe Santarsiero

    Joe Santarsiero OB addict
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    You can use either full coil or half coil.
    For full coil use the outside pairs and leave the centers untapped. Orange and blue is one coil(-B. and +B). red and yellow is the other (-A and +A).
     
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  3. Mike Piechowski

    Mike Piechowski Journeyman
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    This is a good resource for stepper motor wiring:

    Stepper Motor Hardware Interfacing

    Here's another, though it is more oriented towards 3D printers:

    Stepper wiring - RepRapWiki

    In case your wire colors don't match (or are all the same, like some of mine) a multimeter will make finding the pairs easy enough, just look for the two pairs of wires with the highest resistance, that's the full coil.
     
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  4. nima

    nima New
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    i try to drive another 6 wire stepper motor by 4 wire driver (a4988 and using cnc shield v3 and arduino and grbl ) in half-coil mode , in grblControl stepper motor run well but when i send g-code to arduino it dosen't work Properly, srepper motor run cw most of time OK but it run ccw NOT OK , it turns about 4 times and suddenly stop and have some noise . i check driver and every thing .
    why this happen?
    stepper motor : 1.8 deg /2.2 v /2 A FH6-1571

    this is an example g-code that my stepper motor dosent run well on that.
     

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  5. Roy007

    Roy007 New
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    Having the same problem. Were you able to fix the problem. ( Need help please)
     
  6. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Resident Builder Project Maker Contest Winner! Builder

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    Post the details of your particular motor - may help if we can check
     
  7. Carl W. Livingston

    Carl W. Livingston Well-Known
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    On a 6 wire motor, there are actually 4 winding pairs. Two of the windings for each winding pair are connected, internal to the motor.

    This wiring scheme is set up so that configuring it as a Uni-polar motor is relatively easy.

    ---------> 6 WIRE STEPPER MOTOR <----------
    ------------> W1 <-----------------> W2 <----------
    1 --------/\/\/\/\/\/\----|----/\/\/\/\/\/\--------3
    .................................... 2
    ------------> W3 <-----------------> W4 <----------
    4 --------/\/\/\/\/\/\----|----/\/\/\/\/\/\--------6
    ................................... 5

    Obviously, I can't know the exact wire designations of your stepper motor but, the above example will demonstrate the principal.

    If you want to run this motor in a series connected Bi-polar configuration, simply connect wire 1 & 3 to an "H-Bridge" and wires 4 & 6 to a second "H-Bridge". Leave pins 2 & 5 disconnected

    For connection in a parallel connected Bi-polar motor configuration, connect wires 1 & 3 together and, separately, wires 4 & 6 together. Wire 2 and wires 1 & 3 form one parallel winding pair that connects an "H-Bridge while, wire 5 and wires 4 & 6 connect to a second "H-Bridge".
     
    #7 Carl W. Livingston, May 1, 2017
    Last edited: May 1, 2017

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