Dynamics of Active Magnetic Thrust Bearings.

Fukata, Satoru; Kouya, Yoshinori; Shimomachi, Takashi; Mizumachi, Yutaka; Kuga, Makoto

doi:10.1299/jsmec1988.34.404

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…The cross section and the size parameters are shown in Figure 5. According to the magnetic path theory and the influence of the eddy currents, 16 the flux density variation caused by the eddy current is equivalent to the magnetic reluctance and permeability. Under the condition of one-dimensional hypothesis, the stator and the thrust disk just have radial flux component while the air gap and two poles of the stator only have axial flux component.…”

Section: Equivalent Reluctance Models For Mtbmentioning

confidence: 99%

Dynamic performances of a magnetic thrust bearing based on new soft magnetic composites

Xiao

Hou

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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According to the material theory and analysis method, the characteristics of the soft magnetic composites were analyzed. As the required magnetic properties can be achieved by adjusting the formulation ratio, the high electrical resistivity (about 10−4 Ωm) and decent magnetic properties were obtained. Based on the good performance, soft magnetic composites were firstly applied to the magnetic thrust bearings. The dynamic models including the dynamic stiffnesses, magnetic force based on the effective reluctance model were analyzed. The parameters for soft magnetic composites were obtained by experiments and theoretical calculations. The results showed that the dynamic bandwidth of magnetic force for the bearing with MgO-based soft magnetic composites can reach more than 1000 Hz, which is far beyond that for carbon steel bearing. If the magnetic permeability is further increased to 650, the dynamic bandwidth of the electromagnetic force can also exceed 1000 Hz for the magnetic thrust bearings made by soft magnetic composites. Therefore, the possibility of magnetic thrust bearing made by soft magnetic composites instead of carbon steel materials is equipped with the satisfactory performance, which may provide a theoretical basis and technical support for high-performance magnetic thrust bearing.

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Section: Equivalent Reluctance Models For Mtbmentioning

confidence: 99%

Dynamic performances of a magnetic thrust bearing based on new soft magnetic composites

Xiao

Hou

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…Certainly, some excellent analytical methods have been given out for nonlaminated structures. Fukata 3 analyzed the dynamics of an MTB using a linear model in view of the effects of eddy current. The frequency characteristics of the magnetic flux for coil current showed the effects of eddy current on dynamics.…”

Section: Introductionmentioning

confidence: 99%

Frequency domain modeling of eddy current loss for magnetic thrust bearings

Zhang

Tian

2013

Proceedings of the Institution of Mechanical Engineers, Part J:

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The eddy current loss, produced in the solid stator and thrust disk by a time-dependent field, limits the operation performance of magnetic thrust bearings. Therefore, the accurate modeling of eddy current loss is essential for them. This article presents an analytical model to calculate the eddy current loss for a magnetic thrust bearing. After dividing the magnetic thrust bearing into several parts according to flux distributions, the eddy current loss expression for each iron part is proposed by solving one-dimensional diffusion equations and integrating power density over the volume. As the boundary condition of the magnetic field problem, the surface magnetic field intensity is confirmed by a fractional transfer function. Finally, the validity of this model is verified by finite element method analysis and experimental measurements. Based on the above analysis and research, this modeling method can be used as a reference for the eddy current loss calculation of nonlaminated actuators.

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“…Certainly, some excellent analytical methods have been given out for non-laminated structures. Fukata et al [8] analysed the dynamics of an MTB using a linear model in considering of the effect of eddy current. In this model, the eddy current was simplified to be a one-loop circuit and the skin effect was ignored.…”

Section: Introductionmentioning

confidence: 99%

Calculation of eddy current loss for magnetic thrust bearings

Tian

Sun

2011

Proceedings of the Institution of Mechanical Engineers, Part J:

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A magnetic circuit model of eddy current loss for a magnetic thrust bearing (MTB) is presented based on the effective reluctance and the magnetic circuit theorem. Considering the skin effect of eddy current, the effective reluctance is introduced into the flux path, and the magnetic flux, coil impedance and eddy current loss are analysed. In addition, a harmonic analysis on the finite element method model of the MTB and the magnetic circuit model is conducted and the results are compared in consideration of such affecting factors as material non-linearity, leakage, and fringing flux. It shows that the magnetic flux and the coil impedance have the same frequency domain properties in the above two models. The eddy current losses derived from these two models agree well with the experimental results.

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Dynamics of Active Magnetic Thrust Bearings.

Cited by 6 publications

References 4 publications

Dynamic performances of a magnetic thrust bearing based on new soft magnetic composites

Dynamic performances of a magnetic thrust bearing based on new soft magnetic composites

Frequency domain modeling of eddy current loss for magnetic thrust bearings

Calculation of eddy current loss for magnetic thrust bearings

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