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What is maximum winding temperature?
The maximum winding temperature is the sum of the ambient temperature (40°C) and the allowed temperature rise. The allowable temperature rise is made up of two parts: the maximum temperature rise for the insulation class plus a hot-spot over temperature allowance.
What is the range of acceptable motor winding temperature?
The Class F (155 C) temperature rating is popular these days, so it’s a good one to discuss. With Class F insulation, the maximum allowable temperature rise ranges from 105 to 115 C for the motor’s winding insulation, depending on how the motor is configured.
What is a Class F motor?
Motors rated as class “F/B” have a maximum winding temperature equal to that of insulation class F (155 degrees C), but an allowable temperature rise of insulation class B (80 degrees C), giving an additional 25 degree safety margin.
What is hot and cold start of motor?
If the motor is continuous duty and running for some time than a restart after tripping is basically hot start. Cold start is an initial start, after not having run for a relatively long period of time.
What temp is too hot for engine oil?
A quality conventional motor oil will tolerate oil sump temperatures of up to 250 degrees, but starts breaking down over 275 degrees. The traditional approach is to try to hold oil temperatures between 230 and 260 degrees.
What’s the internal temperature of copper winding wire?
I Have 3 motors 150watt 0.75Amp 220V in Copper and Aluminum and Copper clad aluminum. I want to know the maximum internal temperature of these motors so that I can apply a Thermal protection sensor to avoid burning in the future. Can anyone tell me the approximate range of temperature of burning of winding wire.
How is the surface temperature of a motor determined?
If the ambient temperature is 35 C (95 F), the winding total temperature would be: 65 + 35 = 100 C. If motor is so constructed that its surface is about 20 C cooler than the winding, the surface temperature would be: 100 – 20 = 80 C (176 F)—i.e., much too hot to touch safely!
How does temperature affect the magnets in a motor?
Winding resistance and permanent mag- net flux density will change as temperature changes. As the motor temperature increases, winding resistance will increase based on the temperature coefficient of copper. The flux density of the permanent magnets will
Which is the hottest part of a motor?
The winding embedded in the slot is almost always the hottest part, so the winding temperature for this motor could reach 155 C. Motor construction. The surface that our maintenance technician tried to touch will be somewhat cooler than the winding temperature, depending on the motor construction.