Revolving speed observation method for induction machine

Abstract

The invention discloses a revolving speed observation method for an induction machine. The method comprises the following steps that: collecting the components of the stator voltage vector of the induction motor on an [Alpha] axis and a [Beta] axis in a static [Alpha] [Beta] coordinate system as well as the components of the stator voltage vector on the [Alpha] axis and the [Beta] axis; accordingto an induction motor vector control equivalent circuit, obtaining the expression of an excitation current vector in the static [Alpha] [Beta] coordinate system, and establishing the state equation ofthe excitation current vector in the static [Alpha] [Beta] coordinate system; according to the excitation current vector, constructing a slip form observer; after slip form motion happens, carrying out low-pass filtering on a slip form control function to obtain an equivalent slip form control quantity, and establishing the state equation of the equivalent slip form control quantity in the static[Alpha] [Beta] coordinate system; according to the state equation of the equivalent slip form control quantity, in the static [Alpha] [Beta] coordinate system, constructing a quasi observer; and on the basis of the Lyapunov stability theory, obtaining a revolving speed self-adaption expression. By use of the method, the problem of low distinguishing accuracy of a traditional induction motor revolving speed distinguishing implementation method is effectively solved.

Description

technical field [0001] The invention relates to the technical field of motor drive control, in particular to a method for observing the rotational speed of an induction motor. Background technique [0002] In the field of modern motor control, induction motor vector control technology has been widely used. The use of speed sensors destroys the advantages of induction motors such as simple structure, reliability, low cost, and convenient maintenance. At the same time, it also limits the application range of induction motors and reduces System robustness, therefore, no speed sensor has not only become an important research direction of modern AC drive control technology, but also a key technology for researching high-performance general-purpose inverters. [0003] At present, there are many implementation methods for induction motor speed identification through speed sensorless control, such as: Luenberger observer method, model reference adaptive method, neural network and sl...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide an induction motor speed observation method for the low identification accuracy of the traditional induction motor speed identification method.

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