Electromagnetism and Excitation

To spin the rotor

To generate a magnetic field (correct)

To transfer power to or from the rotor

To regulate the flow of electric current

To spin the rotor

To transfer power to or from the rotor

To regulate the flow of electric current

To produce a magnetic field (correct)

It requires the use of carbon brushes

It does not require any excitation

It can be achieved through brushless excitation techniques (correct)

It can only be done by using permanent magnets