[GreenKeys] ASR LMU12 Motor

[w9ddd at tapr.org]

Hi Steve,

I can't picture hoe the motor could over speed. 

What part of the motor did it touch?  Does your motor have the ground strap between motor housing and the cradle or base?

Do your have other words to describe the sound?

John, W9DDD


> On Jan 3, 2021, at 1:38 PM, Steve Garrison <steve.n4tty at gmail.com> wrote:
> 
> OK, folks what can go wrong with a synchronous motor that can make it seem to be turning at a much higher RPM than it should be?
>  
> I had a mishap that shorted a wire against the motor that caused a spark, a pop, and the fuse in the LESU blowing.  After removing the short, replacing the fuse, then powering back up, the machine was running but “sounded funny!”  After removing the typing unit and powering backup I still had the 
> “funny” sound, just not quite as loud.  Without the typing unit it was just the motor and the reperf churning.  The TD drive shafts had been removed earlier.
>  
> My feeling is the “funny” noise is the mechanisms running at a higher RPM than designed.
>  
> I still need to repair the shorted wire, but it isn’t part of the motor circuit anyway.
>  
> Steve G./N4TTY
>  
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