My motor is designed for 40deg ambient temp with F class (Amb.40deg+105K Rise+10K Hot spot allowance) insulation. But my customer wants to use it at 50Deg. As per our spec. motor should be de-rated the max. power should be 93% of the rated power. Means customer has to reduce his application's OP torque about 7%. If my customer doesn't accept reduce the app. torque, can I go for H class (Amb.40deg+125K Rise+10K Hot spot allowance) insulation. Will the 20K additional temp. rise cushion compensate the increase of 10deg in Ambient? What will be the winding temp. according to the ambient temp rise about 10Deg (50Deg)C 20Deg C (60deg)? Pls help
by no potential typical this to be authentic. although, did you recognize what variety of motor? The automobiles own inner termperatures might want to exceed 40C and ambient might want to do not have any more something to do with motor operation. 40C is basically 104F...it really is quite some circumstances a common temp contained in the summer season outdoors or in a cupboard. automobiles might want to no longer replace a lot in this manner of ambient. will be quite a few issues in my adventure: a million. issues have a tendency to develop as they warmth up...perchance binding of a few variety? 2. will be that the ambient from the elements affected the source frequency from the capacity plant replacing the motor speed? although no longer certain how. 3. Line voltages feeding the automobiles will be decrease simply by call for contained in the summer season months? Making the motor weaker and accordingly mutually slower even as operating at load? 4. perchance your persons has worked at in reality one position in his life and the a lot would get better because the temperature rose, causing the automobiles to decelerate? 5. it will be that the automobiles get better resistive with better temps, accordingly getting weaker and slowing down. yet having reported that, 104F(40C) isn't all that warm for an AC motor..it is a temperature in Arizona contained in the summer season. there are quite some approaches that a motor can perceptively decelerate throughout the time of severe ambient...yet they don't look to be designed or behave that way commonly. would want to seek for suggestion from consisting of your persons to get a better precise clarification. i think the burden is what differences. yet no...they ought to no longer decelerate.
In theory the heat dissipation is linear, so an increase in ambient of 10C (aka 10K) will cause the winding temperature to increase by the same amount. Yes, you can use a higher insulation class throughout to allow the motor to run hotter. If you are not the motor manufacturer, ask the manufacturer what they would recommend.
