Method for estimating angular acceleration of permanent magnet brushless direct-current motor

Abstract

The invention discloses a method for estimating angular acceleration of a permanent magnet brushless direct-current motor, which includes establishing a sliding mode observer and observing components of counter potential of the brushless direct current motor to obtain a counter potential observed value; performing filtration through a band-pass filter and filtering direct current offset and high-frequency components of the counter potential observed value to obtain a filtered value of the counter potential observed value; normalizing the filtered counter potential observed value; and establishing an extended Kalman filter according to a kinematical equation of the brushless direct current motor, extracting location information from a normalized value of the counter potential and then estimating to obtain an angular acceleration value. The method uses the location information included in the counter potential to estimate the angular acceleration of the permanent magnet brushless direct-current motor, so that the problems of long delay and poor precision in computed results caused by the fact that the angular acceleration computation of the permanent magnet brushless direct current motor in prior art is influenced by processing precision of Hoer position sensors and is restricted by resolution ratios are solved.

Description

technical field [0001] The invention relates to a method for estimating the angular acceleration of a motor rotor, in particular to a method for estimating the angular acceleration of a permanent magnet brushless DC motor, belonging to the field of permanent magnet motor control. Background technique [0002] Angular acceleration is an important characterization of the dynamic process of the motor. Compared with information such as position and speed, angular acceleration more directly reflects the force on the motor shaft. Applying angular acceleration feedback to permanent magnet brushless DC motor speed control system or position servo system can improve the dynamic quality of motor control and suppress the speed or position fluctuation caused by external disturbance in steady state. For example, after introducing speed differential negative feedback (that is, angular acceleration feedback) in the speed control system, the proportional-integral (PI) regulator can be desat...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for estimating the angular acceleration of a permanent magnet brushless DC motor, which uses the position information contained in the back EMF to estimate the angular acceleration of a permanent magnet brushless DC motor, which solves the problem of permanent magnet brushless DC motor angular acceleration in the prior art. The calculation of the angular acceleration of the brushless DC motor is affected by the machining accuracy and resolution of the Hall position sensor, which leads to the problems of large delay and poor accuracy of the calculation results

Images