I have seen a few single phase motors that acted badly, but not like this.
I am fixing a few things that I did not have time to fix. One is a cable winch, powered by a single phase 1 HP motor. The motor runs a huge worm drive that spins a big shaft on which there are two cable spools, one on each side.
It also has a brake, which developed rust, and needed freeing. (which I did)
It has a 115v, 1 HP GE motor 1725 RPM.
Now it runs, but with problems. The problem is that it starts strongly, then slows down, then the start circuit kicks on, it spins up again, slows down, etc. I have an ammeter in line (this is my custom made 110v tester box). The amps go from "over 25" to 10 to back to "over 25", etc.
If I spin the drive shaft by hand, I do not feel any excessive drag, it seems pretty easy (I can easily turn the shaft with just two fingers).
So, what could explain the motor slowing down? My answer is that it is probably a cap start/cap run motor and the run cap is bad. The motor has only one hump, which sort of disagrees with my explanation. Does this explanation makes sense? Could it be something else?
I will start looking, pretty much, right now, but thought that someone may know some clever trick.
thanks
i