Permanent magnet synchronous motor state estimation method based on fuzzy variable structure model reference adaptive observer

Abstract

The invention discloses a permanent magnet synchronous motor state estimation method based on a fuzzy variable structure model reference adaptive observer. A new model reference adaptive observer is constructed for the estimation of a rotating speed according to the stator voltage and current which are detected in real time. The novel observer is characterized in that the problems of DC bias and error accumulation caused by a pure integration link in an observer through the improvement of a pure integrator in a conventional model reference adaptive observer and the introduction of a PI correction link of a stator flux linkage observation error. Meanwhile, aiming at a problem that a system cannot achieve the detection of the rotating speed in a larger speed range, a fuzzy variable structureadaptive rule is designed. The method provided by the invention still has better estimation performances even under the conditions that there are DC bias and error accumulation, and improves the dynamic tracking performance and estimation precision of the position and speed of a rotor.

Description

technical field [0001] The invention belongs to the field of sensorless control of permanent magnet synchronous motors, in particular to a state estimation method of permanent magnet synchronous motors based on a fuzzy variable structure model reference adaptive observer. Background technique [0002] In recent decades, permanent magnet synchronous motors have been widely used in high-performance servo systems due to their small size, high efficiency, high power density, and good dynamic performance. Accurate position and velocity information is critical for vector control of permanent magnet synchronous motors. The position and speed of the rotor can be detected by installing mechanical sensors such as photoelectric encoders on the rotor shaft, but these sensors not only increase the cost but also reduce the reliability of the system, while limiting the application range of permanent magnet synchronous motors. Therefore, researching the sensorless technology of permanent m...

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Problems solved by technology

[0005] In order to solve the problems existing in the traditional model reference adaptive observer, the present invention proposes a method that can effectively solve the error accumulation and DC bias problems existing in the traditional model reference adaptive observer, and improve the accuracy of the rotor position and speed of the permanent magnet synchronous motor. The estimation method of dynamic tracking performance and estimation accuracy of

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