Induction motor rotor flux linkage control method and control circuit and induction motor

Abstract

The invention provides an induction motor rotor magnetic link control method, an induction motor rotor magnetic link control circuit and an induction motor. The method comprises the following steps of acquiring a stator current value, a stator voltage value and a rotor angular speed value of the induction motor; calculating a rotor magnetic link value of the induction motor by using a first processor; calculating a feedback current value by using a second processor, and feeding the feedback current value as the feedback current value at the next sampling time back to the first processor; according to the rotor magnetic link value, calculating a control current signal and a control voltage signal, thus adjusting the output stator current value and stator voltage value. According to the induction motor rotor magnetic link control method provided by the invention, the feedback current value is calculated by using the second processor and is fed back to the first processor to participate in the calculation of the first processor, and the induction motor rotor magnetic link value at the next sampling time is output, so that the rotation speed and the torque value of the induction motor at the next sampling time is adjusted, the observation precision of a rotor magnetic link obtained when the induction motor is low in speed is improved, and the low-speed control precision of the induction motor is improved.

Description

technical field [0001] The invention relates to a motor control technology, in particular to a method for controlling flux linkage of an induction motor rotor, a control circuit and an induction motor. Background technique [0002] High-performance AC speed control is widely used in transportation and other fields, among which vector control is the most widely used control method for high-performance control of induction motors. In the vector control, the vector control based on the rotor field orientation can realize the decoupling control of the induction motor, and its control performance is comparable to that of the DC motor. In the induction motor vector control system, the flux linkage observation is the key link to realize the accurate orientation of the magnetic field, which directly affects the performance of the control system. [0003] In practical applications, the indirect observation method is usually used to detect physical quantities such as the stator volta...

AI Technical Summary

Problems solved by technology

However, the voltage model method is affected by the deviation of the stator resistance, and the accuracy in the low speed area is low

In addition, due to the introduction of a first-order low-pass filter in the voltage model, there will be errors in the magnitude and phase of the flux linkage, especially at low speeds, and even failure

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