Method and apparatus for estimating rotor position of motor, and motor control system

An apparatus for estimating a rotor position of a motor, comprising a memory, a processor, and a program for estimating the rotor position of the motor stored in the memory and runnable on the processor;

• wherein the processor executes the program to perform:
• obtaining a position error signal by injecting a high-frequency signal into a stator winding of the motor;
• obtaining a load parameter indicating a load of the motor, obtaining a direct-current component disturbance value according to the load parameter and a first preset relationship, obtaining a harmonic component disturbance value according to the load parameter and a second preset relationship, and obtaining an observer parameter value according to the load parameter and a third preset relationship;
• compensating the position error signal or an associated signal of the position error signal according to the direct-current component disturbance value and the harmonic component disturbance value to obtain a compensated position error signal;
• and
• adjusting an observer parameter according to the observer parameter value in real time online to an adjusted observer parameter value based on an offline measured signal, and adjusting the compensated position error signal through the adjusted observer parameter value to obtain the rotor position and a rotor speed.

A motor control system, comprising an apparatus for estimating a rotor position of a motor, the apparatus comprising a memory, a processor, and a program for estimating the rotor position of the motor stored in the memory and runnable on the processor;

• wherein the processor executes the program to perform:
• obtaining a position error signal by injecting a high-frequency signal into a stator winding of the motor;
• obtaining a load parameter indicating a load of the motor, obtaining a direct-current component disturbance value according to the load parameter and a first preset relationship, obtaining a harmonic component disturbance value according to the load parameter and a second preset relationship, and obtaining an observer parameter value according to the load parameter and a third preset relationship;
• compensating the position error signal or an associated signal of the position error signal according to the direct-current component disturbance value and the harmonic component disturbance value to obtain a compensated position error signal;
• and
• adjusting an observer parameter according to the observer parameter value in real time online to an adjusted observer parameter value based on an offline measured signal, and adjusting the compensated position error signal through the adjusted observer parameter value to obtain the rotor position and a rotor speed.