Outline two general methods used to provide a DC field for the rotor in larger three-phase synchronous motors.
What will be an ideal response?
The principle used in the larger three-phase synchronous motors is to provide a DC field for the rotor. The methods may vary in the application of the DC.
1) Some motors use an external DC source and feed the DC to the rotor via slip rings.
2) Other motors control a magnetic field to the rotor and use solid-state rectifiers to create DC in the rotor.
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