A field-weakening control method for induction motors based on optimized six-beat operation

Abstract

The invention provides a field-weakening control method for an induction motor based on optimized six-beat operation, which belongs to the technical field of motor control. The control method first sets the voltage reference value in the field weakening controller to 2U dc / π to ensure that the system can reach the six-beat operation mode, and set the frequency of the feedback current resonant filter to ω * c with 6·ω s The larger value between; when the speed exceeds the rated speed, the motor enters the field weakening area, the inverter will output a six-beat voltage, and the six-beat voltage will cause the generation of the sixth harmonic of the current, and the feedback current with the sixth harmonic will pass through After the resonant filter makes a difference with the given value, it enters the complex vector current regulator. The current regulator generates a given voltage, and the inverter trigger pulse is generated by the SVPWM modulation strategy to control the motor to run in the field weakening area. The invention is applied to the field weakening control of the six-beat operation of the induction motor.

Description

technical field [0001] The invention relates to a field-weakening control method of an induction motor based on optimized six-beat operation, and belongs to the technical field of motor control. Background technique [0002] With the wide application and continuous development of vector control in the field of AC motor speed control systems, AC motors have been significantly improved in terms of drive capability, dynamic response, speed range and accuracy, and therefore gradually replaced DC speed control systems. It is used in various industrial applications including household appliances, elevator traction, automotive machine tools, etc. At the same time, especially in high-performance industrial control applications, such as electric vehicles, CNC machine tool spindle drives, and electric locomotives, the requirements for high precision, high efficiency, and high quality have prompted the development of motor-driven variable frequency speed control systems in the directio...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the nonlinear expansion of the stator voltage of the motor causes the increase of harmonics and the deterioration of the system performance, and at the same time aims at the problem that the traditional filter will reduce the bandwidth of the current loop, a method based on optimized six-beat operation is proposed. Induction Motor Field Weakening Control Method

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