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Electric motor Essay Topics & Paper Examples

Three-Phase Induction Motors

Three-phase induction machines account for the great majority of applications that call for motors with power ratings over 5 hp. They are used to power pumps, fans, compressors, and grinders, and in other industrial applications. Rotating Stator Field. The stator of a three-phase induction machine contains a set of windings to which three-phase electrical power is applied. The stator field can be visualized as a set of north and south poles rotating around the circumference of the stator. (North stator poles are where magnetic flux lines leave the stator, and south stator poles are where magnetic flux lines enter the stator. Because north and south poles occur in pairs, the total number of poles P is always even. The direction…