Current compensation-based unbalance vibration control system for bearingless asynchronous motor

Abstract

The invention discloses a current compensation-based unbalance vibration control system for a bearingless asynchronous motor. A rotor flux linkage-oriented vector control variable-frequency governor provides current to a torque winding to control the rotating speed of the motor and the rotor flux linkage; torque winding stator current components and rotor flux linkage signals are output to an air gap flux linkage observer; two linear integration sub-systems are formed before a random displacement control inverse system is connected to the original system in series; rotor radial displacement is fed into a displacement separation and unbalance vibration compensation force generator to obtain random displacement and unbalance vibration compensation force; the random displacement is fed into the inverse system through a random displacement adjustor to form closed loop control; the inverse system outputs random displacement control current; the unbalance vibration compensation force is subjected to force / flow transformation to obtain unbalance vibration compensation control current; the unbalance vibration compensation control current is correspondingly compared with the random displacement control current to obtain synthetic magnetic levitation control current; and the synthetic magnetic levitation control current is fed into the original system to generate three-phase magnetic levitation control current, so that the unbalance vibration current compensation control on the bearingless asynchronous motor is realized.

Description

technical field [0001] The invention relates to the technical field of drive control of special AC motors, and is especially suitable for the high-precision magnetic levitation operation control of a bearingless asynchronous motor, and is a simple and practical rotor unbalance vibration control system for a bearingless asynchronous motor. Background technique [0002] Bearingless motor is based on the similarity between magnetic bearing and AC motor stator structure. It is a new type of motor suitable for high-speed operation developed in recent years. It has broad application prospects in aerospace, material sealing transmission, advanced manufacturing and other fields. As a rotary drive motor, due to uneven material, machining accuracy, assembly errors, etc., there will inevitably be a certain degree of rotor mass eccentricity, which will generate an exciting force at the same frequency as the rotational speed during rotation, resulting in unbalanced vibration of the rotor ...

AI Technical Summary

Problems solved by technology

As a rotary drive motor, due to uneven material, machining accuracy, assembly errors, etc., there will inevitably be a certain degree of rotor mass eccentricity, which will generate an exciting force at the same frequency as the rotational speed during rotation, resulting in unbalanced vibration of the rotor and affecting Rotor suspension control accuracy

[0003] After searching the existing literature and patents, it is found that there are few research results at home and abroad on the rotor unbalance vibration control technology of bearingless motors, and the existing achievements mainly focus on the synchronous bearingless motor based on static field Balanced vibration, the vibration compensation method is mostly "displacement compensation", and there is no independent control of random displacement and unbalanced displacement, the vibration suppression effect is limited; the bearingless asynchronous motor has the characteristics of a robust mechanical structure and is suitable for high-speed operation, while domestic There are very few reports on the vibration control of external bearingless asynchronous motors; the control of the radial displacement of the bearingless rotor depends on the radial magnetic levitation force, and the control of the magnetic levitation force ultimately depends on the "control current" of the levitation winding

Images