Introduction
In project practice, stepper motors often have faults such as no rotation, step loss, jitter, overheating, and resonance. Most faults are not motor damage but unreasonable wiring, parameter configuration, or load mismatch. This blog summarizes 6 most common faults and one-click debugging solutions.
Fault 1: Motor Does Not Rotate, Only Vibrates
Causes: Wrong wiring sequence of stator windings, incorrect subdivision setting, insufficient driving current, or locked mechanical load.
Solutions: Recheck winding wiring sequence, restore driver factory parameters, appropriately increase driving current, and manually check whether the mechanical structure is stuck.
Fault 2: Serious Step Loss & Position Deviation
Causes: Insufficient torque margin, excessive instantaneous acceleration, too high operating speed, or excessive load beyond motor capacity.
Solutions: Reduce operating speed and acceleration, increase driving current, replace a higher-torque motor, and reduce mechanical load resistance.
Fault 3: Low-Speed Resonance & Obvious Jitter
Causes: The motor works in the natural resonance frequency band, low subdivision grade, and unsmooth mechanical operation.
Solutions: Increase microstep subdivision (16/32 microsteps), appropriately adjust driving voltage, add damping structures, and avoid long-term operation at resonance speed.
Fault 4: Motor Overheating Seriously
Causes: Long-term full-current static holding, excessive driving current, frequent start-stop impact, or motor short circuit.
Solutions: Turn on the driver’s current decay function, reduce static holding current, check wiring for short circuit, and optimize acceleration and deceleration curves.
Fault 5: Unstable Rotation Speed
Causes: Unstable pulse signal, electromagnetic interference, poor driver power supply, and inconsistent mechanical friction.
Solutions: Optimize pulse signal wiring (shielded wire), increase power supply filter capacitor, and fix mechanical gap failure.
Fault 6: Reverse Rotation Abnormity
Causes: Wrong direction signal level or reversed partial winding wiring.
Solutions: Flip the driver direction pin level or swap two-phase winding wiring.
Debugging Tips
When debugging, follow the sequence of no-load test first, then load test. Confirm the normal operation of the motor body and drive parameters without load, then add mechanical load for overall debugging.
Summary
90% of stepper motor faults are caused by parameter and mechanical matching problems. Targeted troubleshooting according to fault phenomena can quickly solve abnormal problems.
