one of these motors doesn't work. I suspect a mechanical problem. any ideas on how to fix / clean this?
#motor doesn't spin, has noticeable resistance if spun by hand.
turbid slate
paper yoke
Swap the motor to a different ESC and see if the motor still doesn't spin
Heavy resistance to turning by hand is a good sign that a motor is shorted somewhere, either in the motor itself or on the ESC
turbid slate
Heavy resistance to turning by hand is a good sign that a motor is shorted somew...
but it does that even when there's no battery plugged in.
paper yoke
Correct
Just moving the motor bell induces current in the stator. That EMF, when there is a short, causes physical resistance to the bell turning
crystal badge
It's pretty fun, if you have a motor lying around you can touch the leads together and feel how it gets harder to spin. It's how ev's regenerative braking works too.
turbid slate
fascinating...
rotund solstice
alternatively, it's bent, or it has grit in it
turbid slate
how can I check for short circuits with a multimeter?
I mean, I don't know the internal wiring of this thing, that's why I'm asking.
rotund solstice
you can't
turbid slate
let me guess: the multimeter always shows continuity on a BLDC motor.
paper yoke
The positive leg of any given phase is the negative leg of the phase next to it, so yes