Todays Project - What did you do today?

[f350ca]

The shop compressor started flickering the lights when it fired up. Even dropped the voltage low enough to shut down the electronics on the cnc plasma table. I was and maybe still am suspecting the connections on the 100 amp overhead service between the house and the shop. An electrician I know was in the other day, he suggested checking the capacitors on the motor. Took them into the rewind place today. The two 1060 mF start capacitors were open and one of the 15 mF run capacitors were open. He didn't have the big ones in stock so had to order them, no problem. My question is how could it start at all if the two start capacitors which are in serious were open? His answer was it had a strong run winding ? Huh.
Thought you needed the start winding to get a single phase motor to start and run in the desired direction.
Guess I know even less than the little bit I thought I knew about electric motors.
To emphasize how little I know, I was quizzing him about the motor on the shaper Im getting. Its supposed to be single phase but I couldn't see any place for the start capacitor. He suggested it might be a Repulsive Start/ Induction Run motor. Again HUH. Apparently they have brushes that supply the starting power (Very high starting torque) then switch to induction mode (not using the brushes) to run. He said if thats what it is do what ever you can to keep it running, apparently they were a great motor aside from having to change brushes).
Any motor gurus