Hi all,
this is my first reprap forum post, but I just fixed my 'sticked' stepper motor - works as new, so I want to share it with you!.
At first, this is caused by magnetic short between two rings with magnets.Once you unscrew backplate, just gently pull out rotor with bearings.There will be two rings of magnets angulary shifted, split with non magnetic gap. If you look closely, you would see iron dust or tiny chips making shortcut between rings of magnets. I used toothbrush to get rid of most of them and then two times thick sticky tape to remove all dust from 'teeth' of magnetic 'gears'. At the and I carefully checked gap and rings for tape leftovers. Finally I assembled motor - slowly pushing body against backplate on flat surface, and holding rotor shaft to avoid touching rotor with stator (and making iron dust again). Screws should be tighten evenly and starting in opposite corners (like changing wheel on car). Don't forget on spring which pushes rear bearing against backplate!
I cleaned all of my cheap 'heacent' stepper motors and now they have much lower 'breaking' torque and run smoother.
Btw. fixing this 'electronically' as proposed by james villeneuve is just ....
Ivan
this is my first reprap forum post, but I just fixed my 'sticked' stepper motor - works as new, so I want to share it with you!.
At first, this is caused by magnetic short between two rings with magnets.Once you unscrew backplate, just gently pull out rotor with bearings.There will be two rings of magnets angulary shifted, split with non magnetic gap. If you look closely, you would see iron dust or tiny chips making shortcut between rings of magnets. I used toothbrush to get rid of most of them and then two times thick sticky tape to remove all dust from 'teeth' of magnetic 'gears'. At the and I carefully checked gap and rings for tape leftovers. Finally I assembled motor - slowly pushing body against backplate on flat surface, and holding rotor shaft to avoid touching rotor with stator (and making iron dust again). Screws should be tighten evenly and starting in opposite corners (like changing wheel on car). Don't forget on spring which pushes rear bearing against backplate!
I cleaned all of my cheap 'heacent' stepper motors and now they have much lower 'breaking' torque and run smoother.
Btw. fixing this 'electronically' as proposed by james villeneuve is just ....
Ivan