Asynchronous motor control method without speed sensor driving

Abstract

The invention discloses an asynchronous motor control method without speed sensor driving. The method comprises the steps: according to the reference rotating speed of a motor, adaptively and smoothlyadjusting the reference flux linkage current and the injection voltage of a flux linkage observer and a rotating speed observer; performing virtual voltage injection on the flux linkage observer andthe rotating speed observer; therefore, according to the method provided by the invention, the rotating speed control precision of the asynchronous motor driven by the speed sensorless control systemduring medium-high rotating speed operation is ensured; when the motor operates at a low synchronous rotating speed or even a zero synchronous rotating speed, 200% of rated torque can be stably outputfor a long time, and smooth switching can be realized, so that the rotating speed of the motor can be accurately controlled within a full-speed rotating speed range, and the motor can stably operate.Moreover, the method provided by the invention can be operated on the basis of any one of the motor flux observer and the rotating speed observer constructed based on the motor model, and is wide inapplication range.

Description

technical field [0001] The invention belongs to the field of speed sensorless control of asynchronous motors, and more specifically relates to a speed sensorless drive asynchronous motor control method. Background technique [0002] As an important part of the equipment manufacturing industry, induction motors (including single-phase, three-phase and multi-phase induction motors) and their drive inverters (including low-voltage, medium-voltage and high-voltage inverters) are widely used in various industries of the national economy . The high reliability of induction motors is the main reason for its wide application. Therefore, in most application fields of induction motors, speed sensors such as encoders and resolvers, which are expensive and unreliable, will be abandoned, and speed sensorless drive technology will be used. The control method of asynchronous motor driven by speed sensor is of great significance. [0003] The rotor speed of an induction motor at zero sync...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a speed sensor-less drive asynchronous motor control method, the purpose of which is to solve the problem that the prior art cannot be realized due to the difference between the input voltage of the observer and the actual voltage of the motor. The problem of satisfying the control accuracy of the speed while the motor runs stably in the full speed range

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