Aside from the obvious difference of voltage source, the significant difference between AC and DC motors is structural, and is directly related to voltage source. Typically, DC motors (and generators ) are built with the field windings incorporated into poles built into the inside of the stator housing, while the armature windings are built into the rotor and connect to the outside through the commutator, commutator slots and brushes. On the other hand, AC motors are built with a slotted stator that houses the armature windings and the field windings are installed on the rotor. With synchronous motors, the field windings are wired to slip rings and brushes to that the field windings can be energized, but with induction motors, the rotor sis built with a squirrel cage that is energized by the rotating magnetic field of the armature windings. The reason the armature windings of the AC motor are in the stator is primarily because of magnitude. AC motors are built to handle m...
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