Asynchronous motor vector controlling magnetic field orientation correcting method based on torque observation

Abstract

The invention discloses an asynchronous motor vector controlling magnetic field orientation correcting method based on torque observation and belongs to the field of asynchronous motor speed regulation. The method relates to a field current loop, a torque current loop, rotor field orientation, stator flux linkage identification, torque observation, space vector modulation, a three-phase full-bridge inverter and an asynchronous motor. Magnetic field orientation correction is achieved by means of the torque observation difference under the dq and alpha beta coordinate systems. Due to the fact that a stator flux linkage is observed directly and observation of a rotor flux linkage is not needed, parameter change on the rotor side does not influence a magnetic field orientation correction system, and parameter robustness is high. An orientation correction model is clear in theory and simple in structure. The method has broad application prospects in asynchronous motor vector control type speed regulation.

Description

technical field [0001] The torque observation-based asynchronous motor vector control field orientation correction method of the present invention belongs to the asynchronous motor speed regulation method of the AC motor class. Background technique [0002] At present, the vector control of asynchronous motor is widely used in the field of electric vehicle drive system and AC drive because of its good control performance and dynamic response. In the 1970s, the German Siemens company F. Blaschke et al. proposed the "control principle of induction motor field orientation" and the patent "transformation control of induction motor stator voltage" applied by P.C. Custman and A.A. Clark in the United States, which laid the foundation for vector control. The basic starting point is to decompose the rotating stator current vector into excitation DC component and torque DC component by taking the rotating space rotor magnetic flux vector as the reference direction, using the transfor...

AI Technical Summary

Problems solved by technology

Obviously, the above two methods directly observe the rotor flux linkage, and the accuracy of the observation is easily affected by the parameters on the rotor side

Orientation accuracy is not only affected by mutual inductance, but also the leakage inductance coefficient is introduced. It is usually difficult to measure the leakage inductance of the motor

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