Air compressor motor gone bad

[Rusty truck Garage]

Any electric motor experts in the garage? My A.O. Smith B-384 motor quit working on my air compressor. Turned it on and started running then it kicked the breaker. Now when I turn it on, it has a loud buzz. Took it to a licensed industrial electrician and he could not find anything wrong with it. Checked everything with a ohms meter, no shorts, no open circuits. He had me try replacing the capacitors and no luck. Any ideas? Power supply is fine, my old compressor works fine.

 

[pattenp]

Does the motor have a centrifugal switch on the start winding? If stuck open then caps aren't doing their job.

 

[BillK]

Rusty,
Basic question but .. does the motor run by itself, not hooked up to the compressor ?

 

[Rusty truck Garage]

The torque switch tests fine and the belt if off. Motor spins freely by hand.

 

[Rusty truck Garage]

I was hoping it would be something simple like a loose wire of replace the caps. Dropped it off at a local repair shop so I should hear back on Monday what wrong with it.

 

[Rusty truck Garage]

Got the call and the motor is junk. Burnt spot in the windings

 

[LS6 Tommy]

Got the call and the motor is junk. Burnt spot in the windings

So much for "Checked everything with a ohms meter"...

Sorry about your misfortune!

Tommy