Nonlinear flux linkage modeling of a bearingless permanent magnet synchronous motor based on AW-LSSVM regression algorithm

Sun, Xiaodong; Su, Bokai; Chen, Long; Yang, Zebin; Chen, Jianfeng; Zhang, Weiyu

doi:10.3233/jae-150165

Cited by 32 publications

(22 citation statements)

References 17 publications

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“…the torque windings and the suspension windings. Through the interaction between the air‐gap magnetic fields generated by the two sets of stator windings, a controllable magnetic suspension force can be generated, which can be used to control the radial suspension of the rotor . Compared with the motor supported by magnetic bearings, the bearingless motor has a shorter shaft length and a higher critical speed, which is more suitable for long‐time and high‐speed operation .…”

Section: Introductionmentioning

confidence: 99%

Stator flux orientation inverse system decoupling control strategy of bearingless induction motor considering stator current dynamics

Chen

2018

IEEJ Transactions Elec Engng

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The bearingless induction motor (BLIM), is a multi-variable, nonlinear, and strongly coupled system. In order to improve its dynamic control performance, considering the stator current dynamics, a stator flux orientation (SFO) inverse system decoupling control strategy is proposed in this paper. Taking the dynamic characteristics of the torque winding current into account, the state equation of the BLIM system based on SFO is established. Then, on the basis of invertibility analysis, the inverse system dynamic mathematical model of the BLIM system is derived, the inverse system dynamic decoupling control strategy is presented, and the comprehensive design of the closed loop for each decoupled linear subsystem is carried out. Simulation experimental results show that the BLIM control system has excellent dynamic and static decoupling control performance, the influence of rotor parameters can be effectively overcome, and the ability to resist the load torque disturbance can be obviously improved.

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Section: Introductionmentioning

confidence: 99%

Stator flux orientation inverse system decoupling control strategy of bearingless induction motor considering stator current dynamics

Chen

2018

IEEJ Transactions Elec Engng

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“…To realize its high performance control, it is necessary to achieve the dynamic decoupling between the controlled variables. As for a nonlinear system, the inverse system method is an effective one that can be used for the liberalization decoupling [12,13]. In addition, to improve the control performance of the torque system, the rotor flux orientation is usually adopted.…”

Section: Introductionmentioning

confidence: 99%

Decoupling Control Strategy of BLIM considering Rotor Mass Eccentricity

2018

Journal of Control Science and Engineering

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A BLIM, i.e., bearingless induction motor, is a multivariable, nonlinear, and strong coupling object; to achieve its high performance magnetic suspension operation control and overcome the influence of the rotor mass eccentricity, a decoupling control strategy considering the rotor mass eccentricity is proposed. Firstly, the mathematical model of the torque system based on the rotor flux orientation and the mathematical model of the magnetic suspension system based on the air gap flux orientation are presented; on this basis, the inverse system decoupling control method of the BLIM is researched. Then, according to the frequency characteristics of the unbalanced displacement, an unbalance vibration compensator is designed, which can generate a compensation force to suppress or eliminate the unbalanced displacement. Simulation experimental results have shown that the decoupling control among the rotor flux-linkage, motor speed, and two radial displacement components can be achieved; in the steady state, the unbalanced displacement can be basically eliminated, while, during the mutation process of motor speed, the unbalanced displacement can be suppressed effectively.

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“…Sun, B. Su, L. Chen, Z. Yang, and K. Li where W and α are magnetic energy of motor and position angle, respectively, and W is approximately equal to magnetic energy in airgap and PM, which can be given as (4) where μ 0 and B are airgap permeability, airgap flux density, respectively, and B along surface of armature can be given as follows:…”

Section: Optimization Of Cogging Torquementioning

confidence: 99%

“…Thus they are suitable for many high speed drive applications, such as flywheel energy storage, compressors, turbomolecular pumps and so on [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of interior composite-rotor bearingless permanent magnet synchronous motors with two layer permanent magnets

Sun

Chen

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. In this paper, a new type of interior composite-rotor bearingless permanent magnet synchronous motors (BPMSMs) with two layer permanent magnets (PMs) is proposed. In order to reduce the torque ripple of this kind of motors, the sizes of PMs are optimized. Moreover, the magnetic field analysis of the interior composite-rotor BPMSM with two layer PMs is carried out by the finite element method (FEM). The corresponding static electronic magnetic characteristics at no load, including magnetic field, PM flux linkage and inductance, are studied in detail. In addition, electromagnetic torque characteristics and suspension force characteristics are also investigated thoroughly. The results of the analysis and simulation lay a significant foundation for further research on the interior composite-rotor BPMSMs with two layer PMs.Key words: bearingless motor, permanent magnet motor, finite element analysis, cogging torque, static electromagnetic characteristics.Design and analysis of interior composite-rotor bearingless permanent magnet synchronous motors with two layer permanent magnets In this paper, an interior composite-rotor BPMSM with two layer PMs is proposed. Then the electromagnetic characteristic of the proposed motor is analyzed by employing the finite element method (FEM) [20], which is used for the optimization of the motor. In Section 2, the suspension principle of proposed motor with two pole pairs of suspension windings and three pole pairs of suspension windings is introduced. In Section 3, the process of optimization based on the size of permanent magnets (PMs) is proposed, as well as the principle of optimization reducing the cogging torque and increasing the suspension force. In Section 4, the finite element model, plot mesh and prototype parameters are presented. Then the basic electromagnetic characteristics at no load including PM flux linkage, magnetic field and inductance of the proposed machine are analyzed. In Section 5, the electromagnetic characteristics are investigated. In Section 6, the suspension force characteristics are analyzed. Finally, Section 7 summarizes the paper. Suspension principleFor generating the suspension force and electromagnetic torque simultaneously, in the BPMSMs, the torque windings and suspension windings are wound together in the same stator slots. Suppose the pole pair number and current frequency of torque windings is P T and ω T . The pole pair number and current frequency of

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Nonlinear flux linkage modeling of a bearingless permanent magnet synchronous motor based on AW-LSSVM regression algorithm

Cited by 32 publications

References 17 publications

Stator flux orientation inverse system decoupling control strategy of bearingless induction motor considering stator current dynamics

Stator flux orientation inverse system decoupling control strategy of bearingless induction motor considering stator current dynamics

Decoupling Control Strategy of BLIM considering Rotor Mass Eccentricity

Design and analysis of interior composite-rotor bearingless permanent magnet synchronous motors with two layer permanent magnets

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