AC Motors and Generators

As was stated in Chap. 5, translating electrical energy into motion is one of the oldest applications of electrical engineering. Both AC and DC motors have been utilized for this purpose. Previously, the universal motor (series connected DC motor) was introduced as a cheap motor that can operate on AC power. Other AC motors include the induction motor and the synchronous motor. However, the brushes of the universal motor and most synchronous motors reduce their reliability. Conversely, AC induction motors have no brushes and are, therefore, the primary motor in many industrial and commercial applications.