Method for controlling synchronous motor low speed sensorless based on self-adaptive filter

Abstract

The invention discloses a method for controlling a synchronous motor low speed sensorless based on a self-adaptive filter, which comprises steps: high frequency voltage signals are injected into a straight shaft of an estimated two-phase rotating coordinate system, high frequency current signals below the two-phase rotating coordinate system corresponding to injection high frequency voltage frequency are extracted by utilizing a self-adaptive band-pass filter, a sine value of an included angle between a high frequency current vector angle and a straight shaft in the two-phase rotating coordinate system is counted by utilizing an quadrature-direct axis high frequency current component signal to combine with trigonometric function relationship, and the rotating speed of a motor and the position of rotors are counted by utilizing counted current vector angles to combine with a phase-locked loop estimation algorithm. The method for controlling the synchronous motor low speed sensorless based on the self-adaptive filter can adjust the bandwidth of a filter transmission band, greatly enhances low frequency attenuating property, effectively filters direct current component in the high frequency current signals, solves the problem of direct current bias in high frequency current, and improves estimation precision. The method for controlling the synchronous motor low speed sensorless based on the self-adaptive filter simplifies signal processing process and the parameter design process of a rotating speed estimator on the whole, and improves dynamic property of a control system.

Description

technical field [0001] The invention relates to a sensorless control method in the low-speed section of a synchronous motor based on an adaptive filter, in particular to a sensorless control method in the low-speed section of a permanent magnet synchronous motor by using an adaptive band-pass filter to extract a high-frequency current signal, combined with a speed position estimation algorithm The control method belongs to the technical field of permanent magnet synchronous motor control. Background technique [0002] Permanent magnet synchronous motor sensorless control refers to the omission of the mechanical sensor to obtain the position information of the motor rotor, while retaining the current sensor that is also required in the torque control. By calculating or observing the electrical quantity containing the rotor position information, it is estimated that the motor rotor The speed and position of the motor, so as to realize the closed-loop control of the motor curre...

AI Technical Summary

Problems solved by technology

At the same time, the parameter design process of the speed estimator is relatively complicated, and the performance of the estimator is greatly affected by the change of the electrical parameter value.

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