Abstract
A high precision feedback control system with a given excitation current speed vector modulation and an integral saturated PI regulator is proposed for multi-scenario application of induction motor with wide speed and load in machine tool processing. Considering the characteristics of the variable range of voltage and current of the induction motor, the constraints of the excitation current of the motor and the slip frequency and other factors, the angular velocity vector of the induction motor, the given excitation current and the given speed variable are extracted as the adjusting variables of the feedback speed loop, and the transformation is carried out in combination with the relationship between the speed and the voltage of the modulation vector. The speed, torque, flux and three-phase stator current variables of the induction motor under the condition of constant torque, constant speed and torque and speed variables change were observed. By comparing the performance improvement of the proposed method with that of the conventional method, the effectiveness of the proposed method and the optimization characteristics of parameters were verified.
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