Rotor optimization in a superconducting magnetic bearing by using frozen image model and Amperian current approximation

Cansız, Ahmet; Yildizer, Irfan; McGuiness, Daniel

doi:10.1016/j.cryogenics.2019.01.002

Cited by 12 publications

(6 citation statements)

References 30 publications

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“…Passive magnetic bearings do not require a feedback control but have more complex designs than AMBs [31,32]. Superconducting magnetic bearings are also extensively studied for flywheel energy storage [33,34,35,36] for their superior performances. However, most of the designs are complicated and require cryogenic equipment.…”

Section: Magnetic Bearingmentioning

confidence: 99%

A review of flywheel energy storage systems: state of the art and opportunities

Palazzolo

2022

Journal of Energy Storage

149

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Section: Magnetic Bearingmentioning

confidence: 99%

A review of flywheel energy storage systems: state of the art and opportunities

Palazzolo

2022

Journal of Energy Storage

149

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“…In sum, the traditional rubbing dynamics research method takes Bearing Body as the rigid supporting unit to analyze dynamic characteristics of a Bearing-Rotor system. MLDSB bears the severe Clearance-Rubbing compound impact load and becomes the weakest link for Bearing-Rotor system [19].…”

Section: Bracket Axial Bearingmentioning

confidence: 99%

Study on Clearance-Rubbing Dynamic Behavior of 2-DOF Supporting System of Magnetic-Liquid Double Suspension Bearing

et al. 2020

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As a new type of suspension bearing, Magnetic-Liquid Double Suspension Bearing (MLDSB) is mainly supported by electromagnetic suspension and supplemented by hydrostatic supporting. Its bearing capacity and stiffness can be greatly improved. Because of the small liquid film thickness (it is smaller 10 times than air gap), the eccentricity, crack, bending of the rotor, and the assembly error, it is easy to cause a clearance-rubbing fault between the rotor and stator. The coating can be worn and peeled, the operating stability can be reduced, and then it is one of the key problems of restricting the development and application of MLDSB. Therefore, the clearance-rubbing dynamic equation of 2-DOF system of MLDSB is established and converted into Taylor Series form and the nonlinear components are retained. Dimensionless treatment is carried out by dimensional normalization method. Finally, the rotor displacement response under different rotor eccentricity ratio and rotating speeds is numerically simulated. The studies show that the trajectory of the rotor is periodic elliptic without clearance-rubbing phenomenon when the eccentricity ratio is less than 0.2, while the rotor is greatly affected by the rotation speed and a variety of motions, such as single-period, quasi-period, double-period and chaos, are presented when greater than 0.3. Within the largest range of rotating speed and eccentricity ratio, the rotor presents the single-period trajectory, and then the number of Poincare mapping point is 1, without a clearance-rubbing fault. When the rotational speed is in the scope of (9, 13) krpm and the eccentricity ratio is in the scope of (0.27, 0.4), the number of Poincare mapping point is more than one, the maximum dimensionless rubbing force is −5.7, and then clearance-rubbing fault occurs. The research can provide a theoretical basis for the safe and stable operation of MLDSB.

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“…O FFERING low losses and passive stability, hightemperature superconductor magnetic levitation bearings [1] have the potential to usher in new classes of ultra-highspeed rotating machines [2], [3], [4], [5], [6]. However, this potential is yet to be realised due to their characteristically low stiffness [7], [8], [9]. Higher stiffness can be provided by augmenting the superconducting bearing with an active magnet bearing [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Angle-Dependence of the Levitation Force From a Frustum-Shaped Magnet and Recessed Superconducting Bulk

Storey

Badcock

2021

IEEE Trans. Appl. Supercond.

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The widespread application of superconducting magnetic levitation bearings is limited by their relatively low stiffness. Recently we investigated a novel thrust bearing geometry comprised of a conical frustum (or truncated cone) shaped permanent magnet levitating inside a matching tapered hole machined into a high-temperature superconductor bulk. This configuration was found to produce superior restoring forces and stiffness compared to the conventional cylindrical magnet and superconductor arrangement. Here, using H-formulation finiteelement simulations, we evaluate the angle-dependence of the frustum on the levitation force. We find that the optimal angle is not universal, but depends on the mode of displacement as well as the frustum dimensions. Correlations with the incident magnetic flux are identified for estimating the angle best suited to the operating regime of the bearing.

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Rotor optimization in a superconducting magnetic bearing by using frozen image model and Amperian current approximation

Cited by 12 publications

References 30 publications

A review of flywheel energy storage systems: state of the art and opportunities

A review of flywheel energy storage systems: state of the art and opportunities

Study on Clearance-Rubbing Dynamic Behavior of 2-DOF Supporting System of Magnetic-Liquid Double Suspension Bearing

Angle-Dependence of the Levitation Force From a Frustum-Shaped Magnet and Recessed Superconducting Bulk

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