Independent speed variable frequency alternating current generator

A method for independent speed variable frequency alternating current (AC) generation comprising:

• generating, at a magnetic field source attached to a rotor, a first rotating magnetic field upon rotation of the rotor, wherein a rotational frequency of the first rotating magnetic field is dependent on a rotational frequency of the rotor;
• and
• generating, at a main rotor winding attached to the rotor, a second rotating magnetic field upon the rotation of the rotor, wherein a rotational frequency of the second rotating magnetic field is independent of the rotational frequency of the rotor;
• and
• converting the second rotating magnetic field into an AC power signal at a main stator winding attached to a stator;
• receiving a reference frequency signal from a generator control unit;
• generating a first intermediate frequency signal that is a difference of the reference frequency signal and a rotor frequency signal associated with the rotational frequency of the rotor;
• generating a second intermediate frequency signal that is a difference of the first intermediate frequency signal and a main field frequency signal associated with the rotational frequency of the second rotating magnetic field relative to the rotor;
• and
• converting the second intermediate frequency signal into an inverter control signal to direct an inverter to alter the main field AC power signal to speed up or slow down rotation of the second rotating magnetic field relative to the rotor.

An alternating current (AC) generator rotor device comprising:

• a magnetic field source configured to generate a first rotating magnetic field upon rotation of a rotor, wherein a rotational frequency of the first rotating magnetic field is dependent on a rotational frequency of the rotor;
• and
• a main rotor winding configured to generate a second rotating magnetic field upon the rotation of the rotor, wherein a rotational frequency of the second rotating magnetic field is independent of the rotational frequency of the rotor;
• and
• a generator control unit that includes control circuitry attached to a stator and control circuitry attached to the rotor, wherein the control circuitry attached to the rotor includes at least one proportional-integral-derivative (PID).