A system and method for online identification of asynchronous motor parameters

Abstract

The present invention provides an asynchronous motor parameter on-line identification system and method. The system includes a voltage acquisition unit, a current acquisition unit, a rotation speed acquisition unit, a timing unit, an A / D sampling unit, a data storage unit and a parameter calculation unit; the voltage acquisition unit acquires the phase voltage of a motor and converts the phase voltage into voltage of +5 to -5V; the current acquisition unit acquires the line current of the motor and convert the line current into voltage of +5 to -5V; the rotation speed acquisition unit converts the mechanical rotating speed of the motor into digital signals through an encoder; the timer unit sends a request to the A / D sampling unit and the data storage unit every fixed time; after receiving the request signals of the timer, the A / D sampling unit converts inputted analog signals into digital signals; after receiving commands sent by the timer unit, the data storage unit reads and stores the digital signals outputted by the A / D sampling unit and the rotation speed sampling unit; and the parameter calculation unit calculates completes the online identification of asynchronous motor parameters by using the data in the data storage unit.

Description

Technical field: [0001] The invention relates to the technical field of motor control, in particular to an asynchronous motor parameter online identification system and method. Background technique: [0002] Since the concept of vector control was proposed, the identification of asynchronous motor parameters has been a hot spot of concern. With the continuous improvement of the manufacturing technology and performance of the microcontroller, the motor control performance has a wider room for improvement. The performance of the current vector control strategy or direct torque control strategy for driving asynchronous motors directly depends on the accuracy of the motor parameters. [0003] At present, the commonly used parameter identification algorithms for asynchronous motors are mostly parameter estimations of the motor in a static state or offline state. However, the actual motor parameters, especially the motor self-inductance and rotor resistance, will be affected by t...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an asynchronous motor parameter online identification system and method for the current problem that the frequency converter with vector control function cannot perform online parameter identification

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