Method and device for feedback control of motor based on pulse width modulation

A method for feedback control of a motor based on pulse width modulation, the motor comprising a signal feedback circuit or the signal feedback circuit being electrically connected to the motor to receive a feedback signal from the motor and output a control signal, and the method comprising:

• S1:
• establishing, in a main control board of the motor, a first set of functional relationships between N different motor state signals and corresponding duty-cycles of a PWM signal, defining a distinct and non-overlapping duty-cycle range for each of the first set of functional relationships;
• establishing, in the main control board, a second set of functional relationships between A different motor state signals and corresponding frequencies of the PWM signal, and defining a distinct and non-overlapping frequency range for each of the second set of functional relationships;
• S2:
• receiving, by the main control board from the motor, the PWM signal comprising a duty-cycle component and a frequency component, wherein the PWM signal integrates a plurality of motor state signals;
• and
• S3:
• identifying, by the main control board, each motor state signal based on the duty-cycle range and the frequency range;
• calculating, by the main control board, an actual value of the duty-cycle component and an actual value of the frequency component respectively based on the first set of functional relationships and the second set of functional relationships;
• and adjusting, by the main control board, one or more target operating parameters of the motor according to the calculated actual values.