Sensorless control system of permanent magnet synchronous motor

Abstract

The invention discloses a sensorless control system of a permanent magnet synchronous motor. The sensorless control system comprises a flux linkage/current state observer and a counter electromotive force measurement module, wherein the flux linkage/current state observer is a sliding mode observer; the sliding mode observer is controlled by a sliding mode variable structure; and the coordinate system of the sliding mode observer is an estimated rotary coordinate system, is rotated at an angular speed and lags behind an electrical angle of the coordinate system. In a control parameter computation module, the error of a rotor position is calculated. The sensorless control system of the permanent magnet synchronous motor, can be used on a low-speed observation occasion and a height observation occasion at the same time and has strong practicability.

Description

technical field The invention relates to the technical field of permanent magnet synchronous motors, in particular to a sensorless control system of permanent magnet synchronous motors. Background technique Permanent magnet synchronous motors use permanent magnets to generate air-gap flux without external excitation, and can obtain extremely high power density and torque / inertia ratio. It has small size, light weight, high energy conversion efficiency, high operating reliability, With the advantages of wide speed range and other advantages, it occupies an increasingly important position in small and medium-sized motion control systems and high-performance control occasions, and has become an important field of research and application. The control of the permanent magnet synchronous motor needs to obtain reliable rotor information, which is now mostly measured by devices such as photoelectric encoders and resolvers, and these devices will increase the size and cost of the mo...

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Problems solved by technology

In order to overcome the shortcomings of the existing sensorless control system of permanent magnet synchronous motors that cannot adapt to low-speed observation occasions and have poor practicabilit

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