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RustyCas

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Reply with quote  #1 
Haven't read all of it, but this looks to be a good paper.  There are several pages of diagnostic charts at the end.

 
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pdf approach-to-solving-motor-vibration-prob.pdf (383.98 KB, 115 views)


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electricpete

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It's a good article. I've read it many times.
One oddball item - Page 3 - 1 times line frequency vibration - never heard of it or seen it.
RustyCas

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Don't know that I have seen 1X LF vibration standing alone, but I often see the interaction of LF and turning speed on 2-pole motors.
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John from PA

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Reply with quote  #4 
Quote:
Originally Posted by electricpete
It's a good article. I've read it many times.
One oddball item - Page 3 - 1 times line frequency vibration - never heard of it or seen it.


One has to read the entire paragraph...

Quote:
This line frequency vibration is normally very small or non-existent, but if the stator or rotor system has a resonance at, or near, line frequency, the vibration may be large.
electricpete

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Reply with quote  #5 

Yeah, I actually read that. I'm not sure why you'd think I didn't (I even said I read the paper many times).  

I've worked on motors full time for 17 years at a facility with thousands of motors. I use log scale. I've never seen 1*LF vibration.  So I call it oddball.  Maybe I should choose a different adjective: peculiar, strange,  unusual, obscure, weeeird...

Nope, I'll stick with oddball ;-)

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