System and method for controlling indirect torque of single regulating loop of three-phase induction motor

Abstract

The invention discloses a system and method for controlling an indirect torque of a single regulating loop of a three-phase induction motor and relates to the technical field of motor drive and alternated current speed regulation. The system is provided with an indirect torque controller, a 32-bit digital signal processor used as the core of the system and a corresponding peripheral circuit. The software of the system comprises a flux linkage observation and torque calculation unit, a steady slip calculation unit, a revolving speed sampling period integral unit, a torque regulator unit, a stator flux linkage vector amplitude and phase calculation unit and a space voltage vector calculating and outputting unit. Through the method provided by the invention, the space voltage vector of controlling the motor in the next period can be acquired by utilizing the efficient value formula of each-phase electromotive force of a motor stator (UE is equal to 4.44kfNF), namely the ratio of the voltage vector amplitude to the phase gain is maintained as a constant when the motion track of a stator flux linkage vector is a flux linkage circle. In the invention, only the torque single proportional-integral (PI) regulating loop is required, thus the system structure is simplified, the dynamic property of the system is enhanced, and the high-performance control of the driving system of the three-phase induction motor is realized.

Description

technical field [0001] The invention relates to the technical field of motor drive and AC speed regulation, in particular to a single-regulation loop indirect torque control system and method for a three-phase induction motor. Background technique [0002] Compared with DC motors, AC motors have sufficient advantages in terms of simple structure, easy maintenance, low environmental requirements, energy saving and increased productivity, making AC speed regulation widely used in industrial and agricultural production, transportation, national defense and daily life. . With the rapid development of power electronics technology, microelectronics technology, and control theory, AC speed regulation technology has also made great progress. [0003] At present, there are mainly two types of vector control and direct torque control in the field of high-performance AC speed regulation: [0004] 1. In 1968, Dr. Hasse of Darmstader University of Technology initially proposed the theo...

AI Technical Summary

Problems solved by technology

However, the feedback required by this control technology is calculated by the motor prediction model, and it is necessary to design an accurate motor prediction model, and there are two adjustment loops for flux linkage and torque, so the design and application are complicated.

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