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Stepper Motor Troubleshooting

fuzion_reaktor

Hello, my name is Peter R and for the past several months I have been building a 3D printer. I have the frame and everything done, but I consistently run into the issue where my stepper motors run erratically; when I issue a movement command they change direction at random, move in unpredictable spurts, clank, grind and make weird noises--and that's if I'm lucky enough to get them running at all. They appear to be uni-polar motors, and I have wired their four wires in as many orientations as possible and still get the same issue? Is this a board problem, or the motors themselves?

The motors are 17H249-02S motors, manufactured by Xuquan motor, but there is little documentation on them on the internet as far I have found.

Many thank to whoever can answer this.

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    A current-source driver is typically less prone to resonance (spazzing out) than other types.  Micro-stepping is just using a sinuate stimulus rather than a square one and tends to diminish (rather profoundly, typically) the chance of resonance.  Yeah, if the current is turned down too low, it will just click or make other sounds.  Once, AF contaminated the signal of my driver and the stepping motor made a so-so speaker!  The way to get this guy to work if it is hooked up properly is to make sure there is the right amt of current, the motors are spected in terms of potential, but what really matters is current, start with nominal motor voltage / coil resistance.  Mechanical loading affects resonance as well, try and have at least a little bit of friction in your load and not too much inertia.  For some situations, micro-strepping isn't the answer because the motor won't stay exactly in place if it is depowered.  TM is right to suggest going slowly at first.

     

    If you have a dual-trace scope (recording is best) your drive signals would be digitized sin and cosine waves, if you kept going the same direction.  You could drive the horizontal axis with one and make a brick-like lissajous figure.  You can make your scope probes into current probes by putting a small resistance across them.  Measuring the potential across the coils and inferring current is the next best thing.

     

    I like TMs idea that you just may not have the current turned up high enough.

     

    Two kinds of torque in a stepping motor, drive torque and detent torque.

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    A current-source driver is typically less prone to resonance (spazzing out) than other types.  Micro-stepping is just using a sinuate stimulus rather than a square one and tends to diminish (rather profoundly, typically) the chance of resonance.  Yeah, if the current is turned down too low, it will just click or make other sounds.  Once, AF contaminated the signal of my driver and the stepping motor made a so-so speaker!  The way to get this guy to work if it is hooked up properly is to make sure there is the right amt of current, the motors are spected in terms of potential, but what really matters is current, start with nominal motor voltage / coil resistance.  Mechanical loading affects resonance as well, try and have at least a little bit of friction in your load and not too much inertia.  For some situations, micro-strepping isn't the answer because the motor won't stay exactly in place if it is depowered.  TM is right to suggest going slowly at first.

     

    If you have a dual-trace scope (recording is best) your drive signals would be digitized sin and cosine waves, if you kept going the same direction.  You could drive the horizontal axis with one and make a brick-like lissajous figure.  You can make your scope probes into current probes by putting a small resistance across them.  Measuring the potential across the coils and inferring current is the next best thing.

     

    I like TMs idea that you just may not have the current turned up high enough.

     

    Two kinds of torque in a stepping motor, drive torque and detent torque.

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