System and method for optimizing rotor vibration compensation through using variable-step variable-angle search genetic algorithm

Abstract

The invention discloses a system and a method for optimizing rotor vibration compensation through using variable-step variable-angle search genetic algorithm of a bearingless permanent magnet synchronous motor. The method comprises the steps that a rotating speed serves as the input of an improved wave trap, and sine and cosine coefficients of vibration signals with the same frequency as a rotor in the x and y directions of the rotor are output by the improved wave trap, the sine coefficient and the cosine coefficient are input into an unbalance compensation module, the unbalance compensation module compares the total vibration amplitude with a vibration target value, if the total vibration amplitude is larger than the vibration target value, compensation control is conducted on rotor vibration through adopting a variable-step-size variable-angle search method, when the vibration of the next step is smaller than that of the previous step, the step size and the angle are increased, and when the vibration of the next step is larger than that of the previous step, the angle is changed by 90 degrees and the step length is changed into the initial search step length. Therefore, the search angle and direction are continuously changed to obtain an identification coefficient, and the optimal compensation current is calculated; and a response speed of rotor vibration compensation is accelerated, and rotor vibration compensation can be carried out under the condition that the motor runs at a full rotating speed.

Description

technical field [0001] The invention relates to the control technology of a bearingless permanent magnet synchronous motor, in particular to the rotor offset and vibration control of the bearingless permanent magnet synchronous motor, which improves the traditional search algorithm with fixed step length and fixed angle, and performs compensation control for rotor unbalance. Background technique [0002] The bearingless permanent magnet synchronous motor is a kind of motor that uses the levitation winding to provide the levitation force, and the torque winding provides the torque to make the rotor levitate and rotate. Therefore, the bearingless permanent magnet synchronous motor has no friction, no wear, no lubrication, high speed and high speed. Accuracy and other advantages, it has important application value in high-tech fields such as centrifuges, sealed pumps, turbomolecular pumps, flywheel energy storage, semiconductor industry, life sciences and aerospace. For the rot...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of vibration and eccentricity of the rotor when the bearingless permanent magnet synchronous motor is working, especially when the motor is working at different speeds, the rotor cannot be positioned with high precision due to offset and vibration. , a rotor vibration compensation system and rotor vibration compensation method optimized based on variable step size and variable angle search genetic algorithm is proposed. The vibration coefficient of the rotor is identified according to the iterative search with variable step size and variable angle. When the search converges to a certain area, the genetic algorithm is used Select the optimal solution, calculate the compensation current required by the rotor vibration, and realize high-precision vibration compensation of the rotor at different speeds

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