Basic Characteristics and Design of a Novel Hybrid Magnetic Bearing for Wind Turbines

Yu, Yinquan; Zhang, Weiyu; Sun, Yuxin; Xu, Peifeng

doi:10.3390/en9110905

Cited by 8 publications

(4 citation statements)

References 21 publications

(18 reference statements)

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“…In the traditional magnetic bearings, the suspension force is produced by suspension windings to overcome the effects of rotor gravity. As a result, the power loss of magnetic bearings is increased [26]. In addition, the effects of rotor gravity in magnetic bearings were not considered in some literature studies, resulting in errors in the control [27].…”

Section: Principle Of Eliminating Rotor Gravity In the Gcwmgmentioning

confidence: 99%

Analytical Model of the Magnetic Field Distribution of a Generator Combined With Magnetic Bearing in Wind Turbines

Yu¹,

Xiang²,

Zhang³

et al. 2018

PIER B

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To achieve radial suspension and eliminate the effect of rotor gravity in wind turbines, a novel structure of a generator combined with a magnetic bearing (GCWMB) is proposed in this paper. The GCWMB not only has the characteristics of the traditional permanent magnet (PM) generator but also has the advantages of reducing friction and starting wind speed, eliminating rotor gravity. The structure and principle of the GCWMB are analyzed in this paper. To improve the calculation accuracy of flux density, an analytical model based on the Fourier series decomposition is proposed to establish the model of flux density in the outer air gap. Taking into account the edge effects and the eccentricity of the rotor, an improved equivalent magnetic circuit method is adopted to model and analyze the flux density in the inner air gap. The effectiveness and correctness of the proposed analytical model in the outer and inner air gaps are verified by finite element analysis (FEA) and experiments.

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Section: Principle Of Eliminating Rotor Gravity In the Gcwmgmentioning

confidence: 99%

Analytical Model of the Magnetic Field Distribution of a Generator Combined With Magnetic Bearing in Wind Turbines

Yu¹,

Xiang²,

Zhang³

et al. 2018

PIER B

Self Cite

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“…Therefore, the heat is transferred between the stator and rotor of the MLRW only by the thermal radiation. Poor heat transfer efficiency causes the temperature to increase, and potentially overheating, in the MLRW system, which is the key issue for the flywheel application [6,7].…”

Section: Introductionmentioning

confidence: 99%

Loss Estimation and Thermal Analysis of a Magnetic Levitation Reaction Flywheel with PMB and AMB for Satellite Application

Tong

Liu

et al. 2022

Energies

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The magnetic levitation reaction flywheel (MLRW) is a novel actuator of spacecraft attitude control because of its significant advantages, including lack of friction and active suppression of vibration. However, in a vacuum environment, the poor heat dissipation conditions make it more sensitive to various losses and rises in temperature. Therefore, increasing temperature is the key issue for components used in space. In this study, the losses of the three kinds of heat-generating areas in the MLRW, namely, the passive magnetic bearing (PMB), the active magnetic bearing (AMB) and brushless DC motor (BLDCM), were analyzed and calculated. Based on the electromagnetic field theory, the loss model of PMB was proposed. Based on the finite element method (FEM) and Bertotti model, the loss power of the AMB and the BLDCM was obtained. The calculated loss values were brought into the FEM to calculate the temperature field distribution of the MLRW system. Then, the key factors affecting the heat dissipation of the flywheel were obtained by combining thermal network analysis with the temperature field distribution. Finally, a prototype was fabricated. The maximum estimated and experimental temperatures were 34.8 °C and 36.8 °C, respectively, both at the BLDCM stator. The maximum error was 5.4%, which validates the calculated model.

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“…With the development of magnetic suspension technology, magnetic suspension technology has been widely applied to various fields, such as bearings [1,2], trains [3,4] and compressors [5]. Furthermore, magnetic suspension technology is also used in harvesting energy technology, in which the magnetic suspension wind turbine [6,7] uses the magnetic force to cause the blades of wind power generation to be suspended in the air gap, and the electrical energy generated by cutting magnetic induction lines is stored in the battery. Currently, magnetic suspension technology is developing rapidly, and mainly includes electromagnetic technology [8,9], permanent magnet (PM) technology [10,11] and hybrid magnet technology [12,13].…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Validation of a Fuzzy Cascade Controller for a Zero-Power Permanent Magnetic Suspension System with Variable Flux Path Control

et al. 2021

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Magnetic suspension technology has been a promising method to achieve contactless movement, and its advantages are smooth motion, no wear, no noise and low maintenance. In previous studies, the suspension force was mainly controlled by the current in the coils, which can lead to energy loss. To solve the problem of energy loss, we have proposed a novel zero-power permanent magnetic suspension system with variable flux path control (ZPPMSS-VFPC); moreover, the interference suppression and response of the ZPPMSS-VFPC need to be further investigated. This paper aims to improve the robustness and decrease the response time for the ZPPMSS-VFPC; as a result, a fuzzy cascade controller composed of a fuzzy controller and a cascade controller is designed and applied, in which the investigated fuzzy cascade control methods include the position loop fuzzy cascade control (PLFCC) and angle loop fuzzy cascade control (ALFCC). The structure and the working principle of the proposed ZPPMSS-VFPC are introduced, and the theoretical modeling and the fuzzy cascade controller design of the system are exhibited. An experimental setup is established to validate the simulation results and to investigate the control effect of the designed controller. The experimental results demonstrate that the response times of the fuzzy cascade controller at the displacement disturbance and the force disturbance are 0.5 s and 0.6 s faster than those of the cascade control, respectively. Furthermore, the control effect of the PLFCC is better than that of the ALFCC. Overall, the fuzzy cascade controller not only has the characteristics of strong adaptability but also has the characteristics of easy adjustment parameters, which can be applied to the complex magnetic suspension system.

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Basic Characteristics and Design of a Novel Hybrid Magnetic Bearing for Wind Turbines

Cited by 8 publications

References 21 publications

Analytical Model of the Magnetic Field Distribution of a Generator Combined With Magnetic Bearing in Wind Turbines

Analytical Model of the Magnetic Field Distribution of a Generator Combined With Magnetic Bearing in Wind Turbines

Loss Estimation and Thermal Analysis of a Magnetic Levitation Reaction Flywheel with PMB and AMB for Satellite Application

Design and Experimental Validation of a Fuzzy Cascade Controller for a Zero-Power Permanent Magnetic Suspension System with Variable Flux Path Control

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