Current Compensation Method for Bearingless Rotor Vibration Unbalance Based on Random Displacement Inverse

Abstract

The invention discloses a random displacement inversion-based vibration unbalance current compensation method for a bearingless rotor. The method comprises the following steps: through synchronous rotating transformation and filtering processing of the rotor, dynamically separating radial displacement of the rotor into random displacement and unbalance displacement, carrying out zero-setting closed-loop regulation on the random displacement, and feeding the output which is processed by a random displacement regulator into a random displacement control inverse system as an acceleration setting signal of the random displacement, so as to obtain a random displacement control current setting signal; carrying out zero-setting closed-loop regulation and feed-forward compensation on the unbalance displacement, and carrying out synchronous rotating coordinate transformation and force / flow transformation processing of a reverse rotor, so as to obtain a rotor unbalance vibration compensation control current setting signal; and correspondingly comparing the rotor unbalance vibration compensation control current setting signal with the random displacement control current setting signal to obtain a synthetic magnetic levitation control current setting signal. Therefore, vibration unbalance current compensation of a bearingless motor rotor is realized; and the unbalance vibration control effect of the bearingless motor rotor is improved.

Description

technical field [0001] The invention relates to the technical field of drive control of special AC motors, is especially suitable for high-precision suspension operation control of bearingless motors, and is a practical method for compensating vibration and unbalanced currents of rotors of bearingless motors. 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 and affecting The suspension ...

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 domestic and foreign research results on the rotor unbalance vibration control technology of bearingless motors, and the main focus is on the unbalanced vibration of synchronous bearingless motors based on static field-oriented control. "Displacement compensation" control, and there is no independent control of random radial displacement and unbalanced displacement according to the displacement characteristics, and the unbalanced vibration suppression effect is limited. In order to improve the real-time and high precision of the radial displacement control of the bearingless motor rotor, it is necessary Introduce modern control theories such as "inverse system control", carry out independent decoupling control on the random displacement and unbalanced displacement of the rotor, adopt a new current compensation method, and construct a bearingless rotor vibration unbalanced current compensation method based on random displacement inverse, so as to use Based on the vibration and unbalance current compensation control system of the rotor of the bearingless motor, the accuracy and real-time performance of the rotor suspension control are improved

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