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CHAPTER 11

CHAPTER 11DC MachinesIntroductionAlthough DC is not widely used by consumers, DC machines have played a major role in industryover the : elevators use DC machines. DC MACHINE:DC machine operates as the result of the interaction of rotating coils with a stationary magneticfield. The rotorcontains the armature winding -a number of coils mounted in lots on the rotor. The ends of the coils are connected to the commutatorat the end of the rotor. Carbon brushesride on the surface of the commutator to make electrical contact from outside the motor to the armature coils.

the motor to the armature coils. ... therefore provides a measure of voltage control for the generator and speed control for the motor. 8. The series machine ... The voltage in a coil is a function of the velocity of the coil through the flux, the length of the coil, and the

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