Dynamic adjustment method of induction motor

Abstract

The invention provides a dynamic adjustment method of an induction motor. The method comprises the following steps of constructing an induction motor model related to the induction motor in advance; calculating, acquiring and outputting an excitation current instruction and a torque current instruction by a controller of the induction motor in advance so that the induction motor is in a locked-rotor state; detecting and acquiring an actual excitation current value and an actual torque current value of the induction motor in the locked-rotor state; according to the excitation current instruction and the actual excitation current value, processing and obtaining a first voltage instruction corresponding to an excitation current; according to the torque current instruction and the actual torque current value, processing and acquiring a current self-tuning value of the induction motor; according to the self-tuning value, processing and acquiring a second voltage instruction corresponding toa torque current; and dynamically controlling the induction motor according to the first voltage instruction and the second voltage instruction. The method has advantages that extra estimation hardware does not need to be added and estimation accuracy is increased; and an estimation method is simple and reliable, and then a control effect of dynamic control is increased.

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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