Decoupling control of a 5-degree-of-freedom bearingless induction motor based on least squares support vector machine inverse

Abstract

In order to realize the nonlinear dynamic decoupling control of a 5-degree-of-freedom bearingless induction motor which consists of a 3-degree-of-freedom magnetic bearing and a 2-degree-of-freedom bearingless induction motor, a decoupling control strategy based on least squares support vector machine inverse is proposed. First, on the basis of introducing the structure of 5-degree-of-freedom bearingless induction motor, the mathematical model is derived. At the same time, the reversibility of the mathematical model is analyzed. Second, the inverse model of 5-degree-of-freedom bearingless induction motor is identified using the regress capability for high-dimensional nonlinear least squares support vector machine within limited samples. In addition, the particle swarm optimization algorithm is used to optimize parameters of the least squares support vector machine, which improves the fitting and predictive precision of the model. Third, combining the least squares support vector machine inverse model with the original system constitutes the pseudo linear system and then proportional-integral-derivative closed-loop controllers are designed to realize the compound control for the 5-degree-of-freedom bearingless induction motor system. The dynamic decoupling control among the radial and axial displacements, speed, and flux linkage is achieved. The simulation and preliminary experiment results all verify the effectiveness of the proposed control strategy.Keywords 5-Degree-of-freedom bearingless induction motor, magnetic bearing, least squares support vector machine inverse, inverse model, decoupling control Date

Complex systems in mechanical engineering

“…A decoupling algorithm is developed and simulation and experimental results are presented to verify the effectiveness of the strategy. 2 In ''Dynamic modeling of dual-arm cooperating manipulators based on Udwadia-Kalaba equation,'' Jia Liu and Rong Liu formulate a generalized dynamical equation for modeling multi-link planar manipulators. They obtain the constraint relationship and the dynamical equation of a dual-arm cooperating manipulator subject to a desired trajectory by means of the Udwadia-Kalaba equation.…”

Recent advances in periodic vibrations of the middle ear with a floating mass transducer

“…Another application of a 5dof model is presented in [5,6], where a mathematical model is analysed to determine equilibrium and associated load distribution in rolling element bearings. Other applications of multi-degreeof-freedom model can be found in [24,25].…”

LS-SVM Inverse System Decoupling Control Strategy of a Bearingless Induction Motor Considering Stator Current Dynamics

“…About the decoupling control strategies of BL-IM system based on the LS-SVM, there have been some research processes. But in the existing researches [29]- [31], the stator current components are selected as the control inputs of the original system, therefore the dynamics of stator current are not taken into account, and as a result, the identified inverse model of the BL-IM system is not accurate enough [28]- [31], which inevitably limits the improvement of the dynamic decoupling control performance of the BL-IM system to a certain extent.…”