Tom,
Mars motors maintains that the varnish on the windings is capable of 150 degrees.
The windings will be far hotter than the case temperature.
A good rule of thumb is that if you can't hold your hand on it, it is getting too hot.
Adding cooling increases the efficiency of the system so is desirable in any event.
Adding a circulation fan to the engine compartment and introducing new air is the easiest way to add cooling.
James
On Mar 21, 2011, at 2:00 PM, Tom wrote:
James Lambden wrote:
"These motors are capable of winding temperatures up to 150 degrees C, though my preference is to run them at 100 to 120 max."
I had no idea that these motors were being run as these high temperatures. Last summer my motor felt too hot to keep my hand on, but nothing like 212-248F. I'll get a good measurement, but it looks like I'm fine without adding cooling.
-Tom
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