pic: burnt up TETRIX motor

[Bill_B]

Originally Posted by Al Skierkiewicz

The motor I have here at work failed in a way that it opened the case and exposed the interior of the inductor. It is a 3.9 microhenry RF choke in series with the motor. The shunt cap is .039 microfarad. The motor interior looks OK but the choke is open circuit. It would appear that the thermal protection is a good fix. Please stand by...

Cursory search for a choke like that with a suitable current rating for this motor is perplexing. The ones I found are all too big to fit inside the motor. The common factor is a resistance so low as to be practically undetectable at .013 .024 ohms for instance. This would sorely test my FIRST Jiminy Cricket if I had two dead motors and less than a week to competition.