DC pre-excitation starting method of asynchronous motor based on flux compensation and deviation decoupling

Abstract

The present invention belongs to the field of the asynchronous motor, and discloses an asynchronous motor direct current pre-excitation starting method based on linkage compensation and deviation decoupling. The objective of the invention is to reduce the starting current when the motor is started, inhibit the generation of the peak current and generate a fast torque response speed. The asynchronous motor direct current pre-excitation starting method based on linkage compensation and deviation decoupling can set the exciting current and the torque current through the pre-excitation control and perform amplitude limiting to allow the motor to build the exciter field in advance before starting, the whole dynamic process employs the linkage error compensation to maintain the linkage stability, and the deviation decoupling can realize the good decoupling effect of the whole control system. The asynchronous motor direct current pre-excitation starting method based on linkage compensation and deviation decoupling can reduce the starting current of the motor, improve the torque response speed and obtain the better effect.

Description

technical field [0001] The invention belongs to the field of asynchronous motors, and in particular relates to a DC pre-excitation starting method for asynchronous motors based on flux compensation and deviation decoupling. Background technique [0002] The two important indicators in the starting performance of the motor generally hope that the starting peak current is small and the output torque response speed is fast. The conventional motor starting methods include direct start, autotransformer step-down start, Y-△ step-down Start, soft start, variable frequency start, etc. Although the above starting methods can meet the requirements in some aspects of improving the starting performance of the motor, sometimes these two indicators cannot be considered at the same time for high-power motors, mainly because the dynamic mathematical model of the asynchronous motor is a nonlinear, high-order, strong coupling The multi-variable system, the fluctuation of the flux linkage amp...

AI Technical Summary

Problems solved by technology

Although the above starting methods can meet the requirements in some aspects of improving the starting performance of the motor, sometimes these two indicators cannot be considered at the same time for high-power motors, mainly because the dynamic mathematical model of the asynchronous motor is a nonlinear, high-order, strong coupling The multi-variable system, the fluctuation of the flux linkage amplitude at the start time and the strong coupling of the whole system make the start-up performance degrade

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