Electrical Theory & Application 425

Introduces the two general types of generator configurations: separatelyexcited and self-excited fields. Presents information on the different types of DC motors. Details the methods of DC hoist motor control including rheostatic starting. Introduces the basic loop circuit between the hoist motor armature and the generator armature. Describes how generator fields can be precisely controlled to directly affect the speed and direction of the hoist motor. Details the various small DC machines used throughout the industry such as door motors, regulators, exciters, and tachometers.