johnm wrote:Have you checked winding continuity with an ohm-meter just to make sure that the start winding is functional? If it has opened up, then you won't develop any starting torque as has been mentioned. I'm sort of surprised that this isn't a capacitor-start motor, since those will develop a much higher starting torque than a split-phase motor (which what this sounds like). Poor starting torque is evidence of a bad (probably shorted) capacitor.
This motor might have an embedded thermal protection device (Klixon) which may have opened up and failed. They are usually buried in the end turns of the motor.
If you have one of these motors running and suddenly change the switch to reverse direction, you'll get a big spike in the input current and probably pop your circuit breaker (or the Klixon).
I have an ohm meter and I have measured between all four combinations of the four leads. The problem being that I don't know what is a good reading and what might be a bad reading. There are no dead shorts.
The motor does have a start capacitor; it is inside of the motor, which I haven't opened yet.
You state that if the motor direction is reversed while it is running there would occur a spike in field current. I suspect that has happened, maybe many times.
This all having been said - I took the motor to a shop here in town to get it checked. They tell me the motor is shorted and would have to be rewound to be repaired.
I don't exactly understand this because when I plug the motor in it actually starts to run though very slowly and with no torgue. Then it pops the breaker.
Nonetheless, I ordered a motor from Shopsmith yesterday. Today I checked status - guess what. It'll go on backorder.
I want to play with my new toy. All day today I fought off the temptation to cannibalize my Power Station to bring up the Crafter's Station.
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