System for adaptive bandwidth control of electric motors using frequency response analysis method

A method of controlling an electric motor, comprising:

• receiving a first instance of feedback from the electric motor operating under control by a processor executing a motor control application;
• receiving an electric motor speed command by the processor;
• generating a characterization tone by the processor, the characterization tone at one or more frequencies above an operating frequency of the electric motor;
• generating, by the processor, a first controller signal based on the first instance of feedback, the characterization tone, the electric motor speed command, and a controller gain;
• outputting the first controller signal by the processor;
• receiving a second instance of feedback from the electric motor by the processor, where the second instance of feedback is from operation of the electric motor based on the first controller signal;
• determining an electric motor windings resistance parameter and an electric motor inductance parameter by the processor based on a frequency component of the second instance of feedback at one or more frequencies associated with the characterization tone;
• and
• determining, by the processor, a new value of the controller gain based on the determined electric motor windings resistance parameter and the determined electric motor windings inductance parameter, where the new value of the controller gain is usable to generate a second controller signal in a subsequent iteration of the motor control application.

A system, comprising:

• a processor;
• a non-transitory memory;
• and
• a field-oriented control (FOC) application stored in the non-transitory memory that is configured, upon execution by the processor, to cause the processor to:
• receive an indication of a motor position of an electric motor,
• receive an indication of phase currents in the electric motor,
• generate a characterization tone at one or more frequencies above an operating frequency of the electric motor,
• generate a first controller signal associated with electric motor torque and a second controller signal associated with electric motor magnetic flux, the first and second controller signals based on the indication of the motor position of the electric motor, the indication of phase currents in the electric motor, the characterization tone, and a controller gain,
• generate pulse width modulation motor drive control signals based on the first controller signal and the second controller signal,
• output the pulse width modulated motor drive control signals,
• then generate a frequency response analysis on the indication of phase currents in the electric motor,
• separate a component of the frequency response analysis at one or more frequencies associated with the characterization tone,
• determine an electric motor windings resistance parameter and an electric motor inductance parameter based on the component of the frequency response analysis at one or more frequencies associated with the characterization tone,
• determine a new value of the controller gain based on the determined electric motor windings resistance parameter and the determined electric motor windings inductance parameter, and
• store the new value of the controller gain, where the new value of the controller gain is usable to generate the controller signal in subsequent iterations of the application.