In another blog post I did a teardown of a TYC synchronous motor. We found that it was made of entirely plastic gears and was a little lacking in quality.
Today I received a new batch of SUH DER (SUHDER) SD83-A synchronous motors. I purchased them directly from the manufacturer in Taiwan. I also had an immediate need to replace a faulty one.
What follows is the teardown of the faulty motor. The motor itself and its gears were all in perfect condition. Its not pictured, but the failure occurred due to dirt and dust getting caught between the motor output shaft and the bushing on the front of the motor.
The bushing is pressed into the front metal panel of the motor. In my case, when the output shaft had seized against the bushing, the bushing itself started to turn. So the motor still worked. That is, until the hole in the front panel of the motor became unevenly worn and the motor could then seize up again.
You may notice evidence of tampering to the motor in the picture below. I had opened this motor previously in order to get it going again. Brute force was involved, and it did work again, but it was time to find a new motor.
Let the teardown begin!
