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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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    What voltage are you powering the motor drivers with?  The board you have contains a chopper drive, which more or less means your driver controls how much current can be delivered to the motors regardless of the motor voltage.  The major benefit is that you can apply higher voltages, which improve the step response of your motors.  What I suspect is that you are running the motors too fast for the voltage you are providing.  Likewise if you are micro-stepping, the motor could be spazzing out, from the torque load.  Stepper torque outputs I believe exponentially decrease with the number of micro-steps.  Last bit, when you transition from stop to start, or direction changes etc.  you need to ramp the motor up to speed.  If you are simply telling the motor to move full speed from a dead stop, you are going to have these kinds of issues.

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    What voltage are you powering the motor drivers with?  The board you have contains a chopper drive, which more or less means your driver controls how much current can be delivered to the motors regardless of the motor voltage.  The major benefit is that you can apply higher voltages, which improve the step response of your motors.  What I suspect is that you are running the motors too fast for the voltage you are providing.  Likewise if you are micro-stepping, the motor could be spazzing out, from the torque load.  Stepper torque outputs I believe exponentially decrease with the number of micro-steps.  Last bit, when you transition from stop to start, or direction changes etc.  you need to ramp the motor up to speed.  If you are simply telling the motor to move full speed from a dead stop, you are going to have these kinds of issues.

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