Just a heads up to those that open up their u90 motors. The only time I have had one pop a line circuit breaker was a short in one of the leads caused by rubbing against the rotor. I posted on the other web site how to make a suppression capacitor if you can¡¯t find one. The caps (3) are there to reduce the arcing of the brushes and the noise that feeds back onto the mains. The motor will run fine without it, however your significant other or the neighbors may complain about the electrical noise on their TVs and stereos, your brushes will wear faster and you will pit the commutator segments .
Now if you reassemble the motor and it runs backwards you will need to swap the brush leads. Oh and the motor will run fine on DC current as well so if you desire to use up a bunch of 12 volt batteries have at it.
Pat
