Chapter 3

Electric Motor Theory

Nearly all commercial and domestic power consumed in the United States is AC. High-voltage AC power is carried great distances by power lines, with minimal power loss. Very little power is lost transforming AC to the voltage value required by a consumer. AC is much more versatile and practical than DC power. AC induction motors require much less maintenance than DC motors because most have no commutator. The variable-hertz drive gives the three-phase induction motor speed control that is almost as good as that of the DC motor.

AC Terminology

Generating Alternating Current

The operation of most AC motors is affected by the way AC power is produced. For this reason, the generating of AC power will be explained ...

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