Direct torque control system and method for reducing motor torque pulsation

Abstract

The invention discloses a direct torque control system and a method for reducing motor torque pulsation. The system comprises a motor situation observation module, a voltage vector generation module and a motor control module, wherein, according to the motor situation observation module, the motor output shaft rotate speed and stator winding transient line voltage and line current are collected during the course of motor operation, so that the motor situation information is figured out: current stator flux amplitude, electromagnetic torque, the sector where the stator flux is located in and the motor output shaft rotate speed. According to the motor situation information, combining with the motor current rotate speed, system setting rotate speed and system setting stator flux amplitude, the motor situation information is figured out through the voltage vector generation module, namely, the basic voltage vector and the time of the basic voltage vector function which is needed to be output through the current motor control module. According to the motor control information, the voltage vector which the motor needs is provided through the motor control module. The direct torque control system and the method for reducing motor torque pulsation has the advantages of significantly reducing motor torque pulsation and accurately and effectively controlling the motor.

Description

technical field [0001] The invention relates to the technical field of direct torque control of asynchronous motors, in particular to a direct torque control system and method for reducing motor torque ripple. Background technique [0002] Direct torque control technology has been continuously optimized and improved in the development process, and there are still many researches on this technology at present. Direct torque control technology abandons the idea of ​​decoupling in vector control. According to the position of stator flux linkage, stator flux linkage and torque error, hysteresis comparator and switch logic table are used to directly generate the stator voltage vector acting on the motor. , the drive motor runs. This technology has the advantage of less dependence on the parameters of the motor model, and has become a new hot spot for AC drives, but its shortcomings are the asymmetry of the flux linkage control, and the large current and torque ripple. In order ...

AI Technical Summary

Problems solved by technology

This technology has the advantage of little dependence on the parameters of the motor model, and has become a new hot spot in AC drives, but its disadvantages are asymmetrical flux linkage control, large current and torque ripples, etc.

In order to overcome the shortcomings of the traditional direct torque control technology, many methods have been proposed in the industry. Lascu C et al. proposed a fuzzy logic adaptive method. The algorithm is more complex and depends on multiple motor parameters

[0003] The current direct torque control method, when considering the influence of the stator resistance, the interval selection is not accurate, the control performance becomes poor when the stator flux linkage is near the section line, and the precondition of torque increase and the criticality of flux linkage change are not considered. conditions, and the torque ripple is reduced but the effect is limited, so the motor cannot be controlled accurately and effectively

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