Asynchronous motor orientation control system and method

Abstract

The invention provides an orientation control system for an asynchronous motor. The orientation control system for the asynchronous motor comprises a magnetic flux calculation unit, a slip calculation unit, a magnetic flux angle calculation unit and a driving unit, wherein the magnetic flux calculation unit is used for calculating the magnetic flux amplitude evaluation value of the asynchronous motor according to excitation current; the slip calculation unit is used for calculating slip according to the magnetic flux amplitude evaluation value; the magnetic flux angle calculation unit is used for calculating the magnetic flux angle according to the slip and the rotating speed of a motor rotor; and the driving device is used for controlling operation of the motor rotor according to the magnetic flux angle. The invention also provides a corresponding method. according to magnetic flux amplitude evaluation and inductance correction, the slip calculation is precise, so that the orientation precision of the asynchronous motor in the starting, accelerating and decelerating process is guaranteed, the accelerating moment or the decelerating moment of the motor rotor is maximum, and the accelerating or decelerating effect of the motor is improved obviously.

Description

technical field [0001] The invention relates to the field of motor control, and more specifically relates to an asynchronous motor orientation control system and method. Background technique [0002] In the vector control technology of asynchronous motors, the rotor field oriented control scheme has been widely used in the field of asynchronous motor drive technology because of its simple technical implementation and fast torque response. In the process of implementing the rotor field oriented control technology, in order to realize the accurate field orientation of the rotor, it is necessary to obtain the accurate calculation result of the slip, and then use the result to calculate and accumulate the synchronous angle, so as to decouple the torque control and magnetic field of the asynchronous motor respectively control. [0003] Such as figure 1 Shown is a schematic diagram of the existing rotor field oriented control technology. In this scheme, only the magnetic flux o...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide an asynchronous motor directional control system and method for the above-mentioned problem that the magnetic field orientation accuracy of the asynchronous motor is affected by the error of the magnetic flux amplitude in the directional control of the asynchronous motor

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