A Dynamic Adjustment Method of Induction Motor

Abstract

The invention provides a dynamic adjustment method of an induction motor, comprising: pre-constructing an induction motor model associated with the induction motor; the excitation current instruction and the torque current instruction obtained and output by the controller of the induction motor in advance so that the induction motor is in a locked-rotor state state; the actual excitation current value and the actual torque current value of the induction motor in the locked rotor state are detected; according to the excitation current instruction and the actual excitation current value, a first voltage instruction corresponding to the excitation current is obtained; and according to the torque current instruction Process with the actual torque current value to obtain the current self-tuning value of the induction motor; process according to the self-tuning value to obtain a second voltage command corresponding to the torque current; dynamically control the induction motor according to the first voltage command and the second voltage command . The beneficial effect of the present invention is that no additional estimation hardware is needed, the accuracy of estimation is improved, and the estimation method is simple and reliable, thereby improving the control effect of dynamic control.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a dynamic adjustment method of an induction motor. Background technique [0002] A high-voltage inverter is a power control device that converts an industrial frequency power supply to another frequency by controlling the on-off function of power semiconductor devices. Since the rotation frequency of the induction motor being driven can be adjusted, the load can be reduced by adjusting the rotation frequency of the induction motor, thereby saving energy and improving work efficiency. [0003] At present, high-voltage inverters can adopt various control methods such as constant V / f control, vector control, direct torque control, and speed sensorless vector control. However, when the control requires high precision, vector control can be used to meet the user's performance requirements. At this time, it is necessary to add the parameters (stator leakage inductance) of the driven in...

AI Technical Summary

Problems solved by technology

[0004] During operation, the current induction motor will cause changes in the inductance value of the induction motor due to temperature changes, magnetic field weakening, armature reaction, etc.; while the existing technology uses the motor parameters provided by the motor manufacturer directly to participate in the control calculation, As a result, problems such as increased control difficulty and unstable control performance can not meet the high-precision control requirements.

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