Asynchronous motor control method without speed sensor driving

Abstract

The invention discloses an asynchronous motor control method without speed sensor driving, and belongs to the technical field of motors. Through adopting a voltage switching structure, the input voltage amplitudes and phases of flux linkage and a rotating speed observer are adaptively adjusted, so that the input voltage of the flux linkage and the rotating speed observer at a low speed is virtualvoltage, and the stable and reliable operation of an asynchronous motor driven by a speed sensorless control system at the low speed is ensured; the input voltage of the flux linkage and the rotatingspeed observer is close to the actual voltage at a high speed, so that the rotating speed control precision of the asynchronous motor driven by the speed sensorless control system during medium-high rotating speed operation is ensured; and the rotating speed of the motor and the flux linkage orientation angle of the motor are estimated, and the asynchronous motor is driven to operate normally by adopting a vector control method, so that the actual flux linkage current, the actual torque current and the estimated rotating speed of the motor are respectively consistent with the reference flux linkage current, the reference torque current and the reference rotating speed of the motor, and smooth switching between the virtual voltage and the actual reference voltage is realized.

Description

technical field [0001] The invention belongs to the technical field of motors, and more specifically relates to a control method for an asynchronous motor driven by a speed sensor. 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 asynchronous motor at zero synchronous speed is un...

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a speed sensorless drive asynchronous motor control method, the purpose of which is to solve the existing fixed coefficient virtual voltage injection technology due to the difference between the observer input voltage and the motor. The actual voltage is different, resulting in the technical problem of insufficient rotor speed control accuracy when the motor is running at medium and high speeds

Images