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- Thread starter kaiser
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Yup.
Small motors can drive you nuts.
Mark a segment ,then go over with multimeter on ohms or a series lamp off a battery.
Should be able to pick up opens with this method.
Another easy test is to connect a power supply on low volts while all but stalling motor with your fingers.
Rotating shaft with your digits will let you know where any dead spots are.
Chances are motor turns and stops on dead spot.
Bloody things!
Small motors can drive you nuts.
Mark a segment ,then go over with multimeter on ohms or a series lamp off a battery.
Should be able to pick up opens with this method.
Another easy test is to connect a power supply on low volts while all but stalling motor with your fingers.
Rotating shaft with your digits will let you know where any dead spots are.
Chances are motor turns and stops on dead spot.
Bloody things!
Just an update. I have now been welding with the machine, and it started to perform erratic again. Clearly it was a problem with the motor, as it would stop, yet the trigger wires were OK and the voltage present at the motor wires. I noticed that it appeared especially at low speeds, and that the motor tended to get stuck in a particular spot. When I held it in my hand and applied power, there were consistent regular jerks or torque reactions, again a problem with a dead segment on the rotor.
Inspection of the motor did not show anything unusual.
Short story, I have now soldered all the crimps on the commutator. They are only bent over tabs from the factory, but clearly that is not a particularly good solution.
And the machine is performing like new again.
Inspection of the motor did not show anything unusual.
Short story, I have now soldered all the crimps on the commutator. They are only bent over tabs from the factory, but clearly that is not a particularly good solution.
And the machine is performing like new again.
