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By Miner J. R.

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Extra resources for A Note on the Fitting of Parabolas(en)(5s)

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The ambient temperature may be reduced from 40°C to 30°C at 6600 feet on many motors. A motor with a higher insulation class may not require derating in these conditions. Ambient Temperature (°C) 40 30 20 Maximum Altitude (Feet) 3300 6600 9900 55 AC Motors and AC Drives Many applications require the speed of an AC motor to vary. The easiest way to vary the speed of an AC induction motor is to use an AC drive to vary the applied frequency. Operating a motor at other than the rated frequency and voltage has an effect on motor current and torque.

Before a motor is started, its windings are at the temperature of the surrounding air. This is known as ambient temperature. NEMA has standardized on an ambient temperature of 40° C, or 104° F within a defined altitude range for all motor classes. Temperature will rise in the motor as soon as it is started. Each insulation class has a specified allowable temperature rise. The combination of ambient temperature and allowed temperature rise equals the maximum winding temperature in a motor. 0 service factor.

The ambient temperature may be reduced from 40°C to 30°C at 6600 feet on many motors. A motor with a higher insulation class may not require derating in these conditions. Ambient Temperature (°C) 40 30 20 Maximum Altitude (Feet) 3300 6600 9900 55 AC Motors and AC Drives Many applications require the speed of an AC motor to vary. The easiest way to vary the speed of an AC induction motor is to use an AC drive to vary the applied frequency. Operating a motor at other than the rated frequency and voltage has an effect on motor current and torque.

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A Note on the Fitting of Parabolas(en)(5s) by Miner J. R.


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