Analysis of hybrid magnetic bearing with a permanent magnet in the rotor by FEM

Xu, Yanliang; Dun, Yueqin; Wang, Xiuhe; Yu, Kexun

doi:10.1109/tmag.2006.871396

Cited by 78 publications

(16 citation statements)

References 4 publications

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“…A good compromise between low cost and high performance can be achieved via a hybrid magnetic bearing (1) , some degrees of freedom being controlled, others not.…”

Section: Introductionmentioning

confidence: 99%

Parameterized Electromechanical Model for Magnetic Bearings with Induced Currents

Kluyskens

Dehez

2009

JSDD

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The purpose of this paper is to present a parameterized electromechanical model taking into account both the electromagnetic nature of the forces acting inside a magnetic bearing and the general rotating machinery aspects, as well as their interactions. This model specifically includes the effect of induced currents. These induced currents in the bearings are submitted to inductive and resistive effects, as well as skin effect, and the influence of these effects is considered. It is shown that the stability of a bearing may be analyzed, based on this model. The parameters of the model are identified from experimental results for an existing semi-passive magnetic bearing, and it is shown that the forces predicted by the model are close to experimental measurements.

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“…A good compromise between low cost and high performance can be achieved via a hybrid magnetic bearing (1) , some degrees of freedom being controlled, others not.…”

Section: Introductionmentioning

confidence: 99%

Parameterized Electromechanical Model for Magnetic Bearings with Induced Currents

Kluyskens

Dehez

2009

JSDD

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“…When |z|<0.4 mm, f z is approximately linear with respect to z and the axial passive stiffness is -4.7×10 4 N/m. The axial passive stiffness of the RHMB is larger than those of conventional homopolar HMBs such as that in [13] with a same stator radius because of its large magnetic pole central angle. The thrust bearings in the conventional HMBs can be excluded for the systems with a low requirement in axial load capacity and control precision, which can simplify the structure and control system, and reduce the power loss and weight.…”

Section: B Force-displacement Characteristicmentioning

confidence: 95%

“…The leaf element is expanded into the edge FEM to calculate the eddy current losses in the thin surface layer of a laminated core [12]. The 3-D finite element models are used to calculate the magnetic field distribution and the force-displacement and the force-current characteristics [13]- [16]. The results are compared with those of the equivalent magnetic circuit method and some prototypes are designed in [15]- [16].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis on Magnetic and Mechanical Characteristics for Hybrid Magnetic Bearing

Eryong¹,

Liu²

2012

Proceedings of the 1st International Conference on Mechanical Engineering and Material Science

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The configuration and working principle of a novel radial hybrid magnetic bearing (RHMB) are introduced in this paper, and its 3-D nonlinear finite element model, based on which air gap magnetic field distributions and magnetic forces on the rotor under different displacements and control currents are calculated, is established with the software ANSYS. The magnetic forces calculated by finite element method (FEM) are compared with those calculated by equivalent magnetic circuit method. The results show that the FEM can comprehensively reflect the magnetic field distribution and mechanical characteristics for the RHMB. When the rotor is in a suspension state without a static load or external disturbance, the air gap magnetic field is uniform and continuous, which is advantageous in reducing eddy current loss. The fluxes of the two radial channels are decoupled from each other, which is favor of reducing control power loss and simplifying control algorithm of the system. The radial magnetic force is approximately linear with respect to radial displacement and control current under the premise that soft magnetic material is not saturated, which is advantageous in improving system control precision. The thrust bearings in conventional structures could be excluded because of the axial passive resilience and large passive stiffness in the novel RHMB, which makes the system a low power loss and a simple structure.

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“…According to equation (28), the optimal external resistor is 35.9 . The dimensions are described in Table 1.…”

Section: Design Of Pmdabmentioning

confidence: 99%

“…Therefore, the structure of PMDAB is more compact and the power loss is less. 28 To improve the passive damping ability of the system, an analytical model is set up especially for the high-speed vibration rotor, and the relation between resistance of radial coils and the provided damping force is discussed for the first time. The coupling characteristic between passive radial damping coefficient and active axial bearing stiffness is also analyzed in this paper.…”

Section: Introductionmentioning

confidence: 99%

An integrated passive magnetic damping system for high-speed compressor with flexible rotor

Fang

Sun

2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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To provide a more reliable rotor damping system for high-speed compressor with flexible rotor, a passive magnetic damping integrated with an active axial bearing (PMDAB) system is proposed. The PMDAB system can provide active force in axial direction and also can provide damping force without control system in radial direction. To enhance the damping ability of the system, an analytical model is set up especially for the high-speed vibration rotor, and the relation between resistance of radial coils and the provided damping force is discussed for the first time. The coupling characteristic between passive radial damping coefficient and active axial bearing stiffness is also analyzed; the result shows that the coupling is too small, therefore can be neglected. Finally, a design example for a high-speed compressor is given based on electromagnetic analysis of PMDAB and dynamic analysis of the flexible rotor. The analytical and design results, which are verified by the finite element method result, show that the PMDAB is effective in controlling the first bending vibration of flexible rotor.

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Analysis of hybrid magnetic bearing with a permanent magnet in the rotor by FEM

Cited by 78 publications

References 4 publications

Parameterized Electromechanical Model for Magnetic Bearings with Induced Currents

Parameterized Electromechanical Model for Magnetic Bearings with Induced Currents

Finite Element Analysis on Magnetic and Mechanical Characteristics for Hybrid Magnetic Bearing

An integrated passive magnetic damping system for high-speed compressor with flexible rotor

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