Unbalance excitation force compensation method of LMS adaptive filtering bearingless motor

Abstract

The invention provides an unbalance excitation force compensation method of an LMS adaptive filtering bearingless motor. The method comprises the following steps: firstly, measuring the rotating mechanical angular velocity Omegar and the real-time radial displacement x(k) of a motor rotor, and constructing dual reference signals of an LMS filter according to the Omegar and the x(k); inputting the x(k) and the dual reference signals into the LMS filter, adjusting the weight of the filter by use of a weight adjustment algorithm containing a simple step length factor adjustment function, and extracting the optimal estimation value of an unbalance vibration displacement signal of the rotor; and performing rotor synchronous revolution transformation, closed-loop feedback and inverse rotor synchronous revolution transformation on the optimal estimation value in sequence, thereby obtaining an unbalance vibration compensation control force signal. The adaptive variable-step length factor adjustment function is capable of adjusting a critical tracking error absolute value between the adaptive fast adjustment stage and the slow adjustment stage of the step length factor by use of a parameter c. The unbalance excitation force compensation method is small in calculation amount, and capable of overcoming unbalance centrifugal excitation force generated due to the mass eccentricity of the rotor; as a result, the suspension control accuracy of the rotor and the unbalance displacement tracking extraction and convergence rates are increased.

Description

technical field [0001] The present invention relates to the high-precision magnetic levitation control technology of bearingless motors in the technical field of AC motor drive and control, in particular to a kind of LMS (least mean square) self-adaptive filtering bearingless motor with strong real-time performance for unbalanced excitation force compensation Control Method. Background technique [0002] Bearingless motor is a new type of motor suitable for high-speed operation developed in recent years, and has broad application prospects in aerospace, material sealing transmission, advanced manufacturing and other fields. Bearingless motors are used as rotary drive motors. Due to uneven material, machining accuracy, assembly errors, etc., there will inevitably be a certain degree of rotor mass eccentricity. Balance vibration or radial displacement fluctuations affect the suspension control accuracy of the rotor. [0003] The radial displacement of the suspended rotor can...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for compensating the unbalanced excitation force of the LMS self-adaptive filter bearingless motor, to overcome the unbalanced vibration problem of the existing bearingless motor, and to select a simpler and more effective step factor self-adaptive Adjust the function to improve the tracking and extraction speed and accuracy of unbalanced displacement, suppress the unbalanced vibration of the rotor through the unbalanced excitation force compensator, and improve the suspension control accuracy

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