Variable frequency independent speed motor control based on flux estimate

A method comprising:

• transmitting an alternating current (AC) power signal from an AC bus to a set of stator windings at a stator of a motor, wherein the AC power signal produces a first rotating magnetic flux at the set of stator windings;
• transmitting an excitation signal from the stator to a set of rotor windings at a rotor of the motor via a high frequency contactless transformer, wherein the excitation signal produces a second rotating magnetic flux at the rotor;
• determining a rotor voltage and a rotor current associated with the excitation signal;
• determining a rotor flux magnitude estimate and a rotor flux angle estimate based on the rotor voltage and the rotor current;
• determining an inverter control signal operable to generate the excitation signal based at least partially on the rotor flux magnitude estimate and the rotor flux angle estimate;
• and
• sending the inverter control signal to an inverter;
• and
• generating the excitation signal at the inverter.

A system comprising one or more processors and memory, the memory storing instructions that, when executed by the processor, cause the processor to:

• determine a rotor voltage and a rotor current associated with an excitation signal that is transmitted from a stator of a motor to a set of rotor windings at a rotor of the motor via a high frequency contactless transformer, wherein the excitation signal produces a rotating magnetic flux at the rotor;
• determine a rotor flux magnitude estimate and a rotor flux angle estimate based on the rotor voltage and the rotor current;
• and
• determine an inverter control signal operable to generate the excitation signal based at least partially on the rotor flux magnitude estimate and the rotor flux angle estimate, wherein the inverter control signal is used to generate the excitation signal.