December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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106 Introduction to Electrical Power and Power Electronics
rings and brushes to get high starting torque for heavy loads. Once the motor comes
to full speed, the external resistance in the rotor circuit is reduced to zero by shorting
the slip rings to gain better running efciency.
4.2 SYNCHRONOUS MOTOR
The synchronous motor has the same construction as the synchronous generator,
except that the current and energy conversion directions are reversed. The three-
phase stator currents produce the rotating magnetic eld as in the induction motor,
and dc current is injected in the rotor coil from outside through brushes and slip
rings. Therefore, it ...
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