My compressed motor is running slow (speed changes)

my compressed motor is running slower than normal and slows and speeds up a lot.

I checked the power and I have 15 amps going the regulator but the amperage going form there to the motor varies from 5 to 15 amps.

Also I've found that when the compressor is running slow, if I restrict the airflow into the compressor it will run faster. Is this just because I take the load away??

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Bill says...

"I checked the power and I have 15 amps going the regulator" by this I understand that you have 15 amps going to the pressure switch?

The change in amperage to the motor from the pressure switch suggests to me that the motor demand is changing.

An electric motor will draw more amps as the load on it increases, that due to pressure build up in the tank.

A speeding up and slowing down motor may be as a result of variable power supply, and if that's the case, you are wearing out your motor faster than normal.

I suspect, however, that it's the motor itself that is failing, and the change in amperage draw is caused by the motor as it tries to continue running through whatever is failing. That's my guess.

It were me, I'd take the motor to an electrical motor rewind shop and ask them to test it out.

Cheers,

Bill