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0 service factor. The maximum winding temperature is 145° C (40° ambient plus 105° rise). A margin is allowed to provide for a point at the center of the motor’s windings where the temperature is higher. This is referred to as the motor’s hot spot. 180° 160° 140° 120° 100° 80° 60° 40° 20° 0° 5° 60° Class A 60° C Rise 5° C Hot Spot 180° 160° 140° 120° 100° 80° 60° 40° 20° 0° 10° 80° Class B 80° C Rise 10° C Hot Spot 180° 160° 140° 120° 100° 80° 60° 40° 20° 0° 10° 105° Class F 105° C Rise 10° C Hot Spot 180° 160° 140° 120° 100° 80° 60° 40° 20° 0° 15° 125° Class H 125° C Rise 15° C Hot Spot The operating temperature of a motor is important to efficient operation and long life.

N S N S ____________ 3. When current flows through a conductor a ____________ ____________ is produced around the conductor. 4. 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.

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. In this example six coils are used, two coils for each of the three phases. The coils operate in pairs. The coils are wrapped around the soft iron core material of the stator. These coils are referred to as motor windings. Each motor winding becomes a separate electromagnet. The coils are wound in such a way that when current flows in them one coil is a north pole and its pair is a south pole.

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AC Motors(en)(92s)


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