The fields of automatic control and automation have brought an increasing demand for energy-conversion devices. Industrial plants are continually seeking means to improve production methods and control the quality of their products and services.
To satisfy these needs, techniques involving sequential and logic circuits, servomechanisms, static switching, data processing, and electronics to control motors and generators have been rapidly developed and improved.
In dealing with control circuits, it is necessary to understand the theory of operation of the device to be controlled. Motors, generators, and transformers are integral parts of many control systems, and it is essential that today's engineer and technician be familiar with this equipment.
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