14-06-2021, 03:53 PM
Presumably you have checked resistance between each adjacent commutator segment? Maybe one or more windings shorting/dry joint at coil to segment joint. Enough magnetism produced to spin motor when free but not enough under load.
Measuring each would show up any fault, but not need to know what reading should be.....just that there is a difference. Then knowing there is a fault this narrows where to look.
Measuring each would show up any fault, but not need to know what reading should be.....just that there is a difference. Then knowing there is a fault this narrows where to look.