Motor Insulation Class
Motor Insulation Class
(OP)
I am writing a report about operating temperatures and expected lifespan of a Class F motor. I was looking for a good copy I can insert in my report of a graph that I have seen of winding temperature and insulation life.
Anybody know where a insulation life versus winding temperature graph is posted that is available to use?
If it is in a standard, let me know and I can get the standard.
Anybody know where a insulation life versus winding temperature graph is posted that is available to use?
If it is in a standard, let me know and I can get the standard.





RE: Motor Insulation Class
RE: Motor Insulation Class
http://www.weibull.com/AccelTestWeb/temperature_no...
http://www.weibull.com/AccelTestWeb/arrhenius_rela...
http://www.chemguide.co.uk/physical/basicrates/arr...
http://www.shodor.org/UNChem/advanced/kin/arrheniu...
There are probably better links than this but there are so many to chose from if you type "arrhenius+plot" into a search engine. If you add the word "motor" you still get a lot of links.
RE: Motor Insulation Class
http://www.usbr.gov/power/data/fist_pub.html
go to keeping motor winding dry
I have seen the graph in one of the articles posted here.
To me the insulation life at rated temperature is 40 years. For motors winding keeping them free of dust, moisture and oil is extremely important.
Check the NEMA website for standard, I think its NEMA MG-1 or 2
RE: Motor Insulation Class
It is based on accelerated life motorette testing. Correlation to actual insulation lifetime in a motor is subjective.
I looked at a few IEEE standards and couldn't find it the graph. One I could locatewas IEEE-1. You might look at that if you have access.
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RE: Motor Insulation Class
Temperature Vs Life (Figure 3) in IEEE117 and 101.
If you can't get a copy, send me your fax or email and I'll send you one.
RE: Motor Insulation Class
... and repeated in this one:
http://www.mt-online.com/articles/0704easa.cfm#tab...
There is also a promising graph on page 10 of this PowerPoint presentation, but it doesn't show a source.
http://baen.tamu.edu/users/stark/AGSM325_files/Lec...
"Venditori de oleum-vipera non vigere excordis populi"
RE: Motor Insulation Class