A Method for Estimating the Rotational Speed ​​of Induction Motor Based on Romberg Observer

Abstract

The invention discloses an induction motor rotation speed estimation method based on a new-type Romberg observer. On the basis of a model reference adaptive principle, a current model is taken as a reference model of the Romberg observer and a motor model is taken as an adjustable model of the Romberg observer. A new-type gain matrix module is designed according to a traditional Romberg observer and a rotation speed estimation module is improved, so the high performance rotation speed estimation is realized. According to the rotation speed estimation method, the load interference resistance ishigh, the robustness for parameter change is good, the rotation speed can be accurately estimated when an induction motor operates at low speed, the estimated rotation speed is relatively high and stable in precision, and a waveform is relatively smooth.

Description

technical field [0001] The invention relates to motor control technology, in particular to a method for estimating the rotational speed of an induction motor based on a Romberg observer. Background technique [0002] At present, in the application of motors, AC motors account for about 90%, and the most widely used ones are induction motors. Compared with the DC motor of the same power, the induction motor has the advantages of convenient manufacture, low price, simple structure, reliable operation, small moment of inertia, simple maintenance, durability, long life, and can be used in harsh occasions. Since there is no contact between the rotor and the stator winding of the induction motor, it is not limited by some inherent factors in the DC motor, and can be widely used in various occasions, from general industrial technology to aerospace, aviation military industry, to Household appliances, intelligent robot control, etc. [0003] In order to improve the performance of ...

AI Technical Summary

Problems solved by technology

In the model reference adaptive method, the voltage reference model has two disadvantages: one is that the parameter matrix of the voltage model contains parameters such as stator resistance. In actual situations, some parameters of the motor will change due to changes in environmental factors such as temperature. The change will lead to errors in the calculation of the flux linkage; the second is that the voltage model contains a pure integral link. When the motor is running at a low speed, the integral calculation produces a large error, which affects the accuracy of the motor control, deviates from the actual situation, and has poor convergence.

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