I am working on a proprietary 1ph, 1.5-2.0HP cap st/run motor. I was there when it went down and now need to repair. We would install another motor but this one was made with a special case to fit. What luck!!
Anyway, I am not new to motors but this one has beaten me. Motor developed a vibration when running after a long period of running. Shut down and pulled motor thinking bearings went bad. Bearings were fine but found run cap to be shorted and swollen up. Replaced. Motor will not start. Pulls approx FLA (no FLA in name plate). I jumped the potential relay hoping to confirm the start winding was coming in. Nothing. Start cap was tested fine. I even tried to rope start by getting motor up to about 300-400rpm and threw the switch. It just growls.
We are now looking to rewind it since custom fitting a new motor will NOT be fun. I tested resistance in the windings and values do not gel with ohms law and want to confirm. I am estimating about 350ft of 24ga wire for the start winding and 350ft of 17ga for the main windings.
The start winding shows 2.8ohms, both mains in series shows .8ohms or .4ohms per coil separately. I do not feel my wiring estimates are that far off. I have counted the turns and estimated loop lengths. I am curious where I could be seeing problems here? Nothing is leaking to ground.
Anyway, I am not new to motors but this one has beaten me. Motor developed a vibration when running after a long period of running. Shut down and pulled motor thinking bearings went bad. Bearings were fine but found run cap to be shorted and swollen up. Replaced. Motor will not start. Pulls approx FLA (no FLA in name plate). I jumped the potential relay hoping to confirm the start winding was coming in. Nothing. Start cap was tested fine. I even tried to rope start by getting motor up to about 300-400rpm and threw the switch. It just growls.
We are now looking to rewind it since custom fitting a new motor will NOT be fun. I tested resistance in the windings and values do not gel with ohms law and want to confirm. I am estimating about 350ft of 24ga wire for the start winding and 350ft of 17ga for the main windings.
The start winding shows 2.8ohms, both mains in series shows .8ohms or .4ohms per coil separately. I do not feel my wiring estimates are that far off. I have counted the turns and estimated loop lengths. I am curious where I could be seeing problems here? Nothing is leaking to ground.