Hello,
I am using 4 stepper motors in my puppet show.
"42HD8011-01" with TMC2209 Driver.
I have my Vref set to 2.11V (1.5A).
Everything was working just fine ... but for brief moment one of the motors, via error in code, was going too fast and it stopped and vibrated for while.
It damaged him somehow.
Now it can go only half speed than before. If i try to go faster than 30% previously posible speed he just start shaking and stops. I tried different driver and it does same thing, so it must be motor.
The thing is, if i disasemble him ... inside hes just fine ... nothing bendet, nothink broken, all conections are as they should be. bearings smiling.
Yea, I am stupid and everything, but is there a way to fix it? ... i just dont see anything wrong with it ... even from inside. To 30% he work just fine.
Easy to check your motor with your Ohmmeter. Your motor has TWO windings, so 4 wires. each pair should show similar resistance. If true, then the motor is fine, but the problem is elsewhere. More that likely, the controller is damaged.
If a coil becomes too hot then the isolation may melt or burn and cause an internal short circuit. The coil now behaves like a transformer with the shorted windings as a shorted secondary coil. This can make the motor behave in an unexpected way.
If you wire both windings in series and apply moderate AC to it, in the range of their operating voltages, you can measure the voltage drop on either coil. If the voltages differ you most probably have shorted windings in the coil with the lower voltage.