Author Topic: All right, I've done it now!  (Read 13451 times)

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Offline AlfBaz

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Re: All right, I've done it now!
« Reply #50 on: March 19, 2013, 11:55:43 pm »
I once worked on a large series DC traction motor that when ever it was powered up it made a terrible knocking noise. Turned the power off the motor was still spinning at roughly the same speed but no noise. The 2 stator coils were bolted to the carcase with 3 bolts each, one of them didn't have a nut on it. The armature's magnetism pulled it in whenever it was energised  :palm:
 


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