I have a brushless servo that appears fully functional but has a slight torque/speed ripple that produces waves in its final application.
The datasheet says the windings should have 4.2r of resistance, and A to C measures correctly. AB and BC both measure 6r. A working servo measures 4.2r across all windings as expected.
I know that typically windings fail fully open or show decreased resistance as the insulation degrades. Any idea what could have happened here?
Unfortunately I have no idea what the electrical schematic of the motor looks like. Maybe they split each winding into three parallel magnet wires and one got loose?