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single phase motors.

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vintageandclassicrepairs:
Hi Muzzerboy and All,

It has been a very long time since I was lectured at college on motor theory  :smart:
so I got the theory incorrect :palm:
However
Practical lessons and experience do not always agree with the books !!


--- Quote ---The comments regarding motor heating are consistent with a single phase motor that we fitted to a customers machine recently. The motor would run quite hot (but within its design temperature) if it was working at full load or at no load. We were concerned and the supplier gave us a further two motors to test, both of them gave the same results. The motor manufacturer was given the two motors back and as yet have not explained the temperature rise, but we did note that the current drawn when running without load was only slightly less than the full load current.
--- End quote ---

I have found the same issues as quoted on several occasions throughout the last 40 odd years
An example is a 1/2Hp motor I have used on a pillar drill without issues or overheating despite lots of  hard use
I was given this motor for free as on bench testing (without load) it would get very very hot
It does not even get warm when driving the drill for long periods

John

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