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IndustryArena Forum > CNC Electronics > Stepper Motors / Drives > Stepper motor stalls while accelerating

Thread: Stepper motor stalls while accelerating

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  1. 04-11-2014, 03:41 PM #1
    abdelaziz.saber
    abdelaziz.saber is offline Registered
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    Apr 2014
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    Exclamation Stepper motor stalls while accelerating

    Hello guys,

    This is my second attempt to run stepper motor using a driver I made myself.

    The first attempt was running the stepper motor with a constant speed and it was working fine.

    the second one -which I'm doing now- is accelerating the motor speed with a ramp profile, but the motor begins to lose steps and finally stops!! Attached is a video of when this is happening.
    The driver is 4 TIP122 NPN transistors driven by 4 2n2222 NPN transistors, which are isolated using opto-couplers from the microcontroller.
    The motor is unipolar stepper.

    please help me with that problem.
    Attached Files Attached Files
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  2. 04-11-2014, 07:24 PM #2
    awerby
    awerby is offline Member
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    Re: Stepper motor stalls while accelerating

    You might try reducing the acceleration until you stop losing steps.
    Andrew Werby
    Website
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  3. 04-11-2014, 11:11 PM #3
    cncfixxer
    cncfixxer is offline Registered
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    Re: Stepper motor stalls while accelerating

    Try decreasing the power resistors by 10% ---- it will draw a little more current but should increase speed
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