Big motors come with heat sensing resistance in winding, it will disconnect automatically when motor over heat,,,similarly we can add some temperature sensor with resistance measure temperature all time thanks
good lesson...another area that some maintenance personnel often overlook is the cooling fin on the motor frame. when it is clogged with debris of any kind it contributes to the overheating of the motor
Great question. The maximum ambient temperature for motor operations is 40°C. Anything higher will require derating. In regards to the temperature of the motor windings, these measurements are made internally via RTDs or thermistors and the allowable temperature is defined by the insulation class. (Class: A = 105°C, B = 130°C, F = 155°C, and H = 180°C.) The surface temperature will generally run 20°- 30° C lower than the temperature of the windings.
Great question. Is the motor fan ventilated? If it's fan ventilated, a secondary blower must be added to achieve high torque at low speed due to the cooling drop off caused by the low speed. If the motor isn't fan ventilated, then it's likely that either the FLA or duty rating is being exceeded and the motor is undersized for the application.
I'm seeking clarification regarding the current rating of the motor mentioned in your video. The motor sheet stated that at 115 V, the current is 12.5 amps, could you advise?
Hi James, thanks for the comment. In this particular video, I don't see a reference to 115v 12 amp motor. The motor on the table is a 575v 5 amp motor. Were you looking at a different video by chance?
My electric Motor makes a squeaking noise when you turn the shaft by hand or when the motor comes to a stop. It sounds fin while running. My theory is that the bearings need lubrication? Is this assessment accurate?
This is very good and often overlooked advice . Well done
Thanks Duane.
Big motors come with heat sensing resistance in winding, it will disconnect automatically when motor over heat,,,similarly we can add some temperature sensor with resistance measure temperature all time thanks
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good lesson...another area that some maintenance personnel often overlook is the cooling fin on the motor frame. when it is clogged with debris of any kind it contributes to the overheating of the motor
Great point! You might like this video: th-cam.com/video/R7hpQia0WXc/w-d-xo.htmlsi=byxPhdovDITfy_iB
In regards to overheating, how do I find what the normal operating temperature of an electric motor should be?
Great question. The maximum ambient temperature for motor operations is 40°C. Anything higher will require derating.
In regards to the temperature of the motor windings, these measurements are made internally via RTDs or thermistors and the allowable temperature is defined by the insulation class. (Class: A = 105°C, B = 130°C, F = 155°C, and H = 180°C.)
The surface temperature will generally run 20°- 30° C lower than the temperature of the windings.
Motor overheating due to high torque on low speed. I have this on chilled water pumps running on vfd's. Not sure what to do about it.
Great question. Is the motor fan ventilated? If it's fan ventilated, a secondary blower must be added to achieve high torque at low speed due to the cooling drop off caused by the low speed. If the motor isn't fan ventilated, then it's likely that either the FLA or duty rating is being exceeded and the motor is undersized for the application.
I'm seeking clarification regarding the current rating of the motor mentioned in your video. The motor sheet stated that at 115 V, the current is 12.5 amps, could you advise?
Hi James, thanks for the comment. In this particular video, I don't see a reference to 115v 12 amp motor. The motor on the table is a 575v 5 amp motor. Were you looking at a different video by chance?
My electric Motor makes a squeaking noise when you turn the shaft by hand or when the motor comes to a stop. It sounds fin while running. My theory is that the bearings need lubrication? Is this assessment accurate?
Hi Eric, sounds like the bearing either need to be greased or replaced. I'd try greasing them first and see if this fixes the issue.
Here's the step by step guide: th-cam.com/video/PjeDqPBp0RA/w-d-xo.htmlfeature=shared