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These decreases are all related and greatly affect the motor’s ability to handle a given load. Φ≈ E F T = kΦIW IM = 56 E 2πFLM Constant torque AC motors running on an AC line operate with a constant flux (F) because voltage and frequency are constant. Motors operated with constant flux are said to have constant torque. Actual torque produced, however, is determined by the demand of the load. T = kΦIW An AC drive is capable of operating a motor with constant flux (F) from approximately zero (0) to the motor’s rated nameplate frequency (typically 60 Hz).

The torque dips slightly after it is started and then increases to full-load torque as the pump comes up to speed. This is typically defined as a variable torque load. 300 275 250 225 200 175 150 125 600 Lb-Ft 100 75 50 25 0 120 Lb-Ft 0 10 20 30 40 50 60 70 80 90 100 % Synchronous Speed 63 A motor has to be selected that can start and accelerate the centrifugal pump. By comparing a 200 HP NEMA B motor curve to the load curve, it can be seen that the motor will easily start and accelerate the load.

Which of the following will not increase the strength of the magnetic field? A. B. C. D. 30 Increase the current flow Increase the number of turns in a coil Add an iron core to a coil Increase the frequency of the AC power supply Developing a Rotating Magnetic Field The principles of electromagnetism explain the shaft rotation of an AC motor. Recall that the stator of an AC motor is a hollow cylinder in which coils of insulated wire are inserted. Stator coil arrangement The following schematic illustrates the relationship of the coils.

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AC Motors(en)(92s)


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