Fabrication of HTS Bearings With Ton Load Performance

Floegel-Delor, U.; Rothfeld, R.; Wippich, D.; Goebel, Bernd; Riedel, Thomas; Werfel, F.

doi:10.1109/tasc.2007.898416

Cited by 38 publications

(14 citation statements)

References 5 publications

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“…Based on this characteristic, HTS maglev has been successfully applied in magnetic bearing, flywheel energy storage, rail transit, and other fields. Magnetic bearing has been studied for nearly 20 years in the United States [1], Germany [2], and Japan [3], and has gradually been extended to large-scale commercial applications. Other countries, such as South Korea [4], are gradually increasing their investment in this field.…”

Section: Introductionmentioning

confidence: 99%

Design and Operating Mode Study of a New Concept Maglev Car Employing Permanent Magnet Electrodynamic Suspension Technology

et al. 2021

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Based on the principle of permanent magnet electrodynamic suspension (PMEDS), a new concept maglev car was designed by using rotary magnetic wheels and a conductor plate. It has the advantages of being high-speed, low-noise, environmentally friendly, safe and efficient. The PMEDS car is designed to use a permanent magnet electrodynamic wheel (EDW) to achieve the integration of levitation force and driving force. The levitation force is generated by the repulsive force of the eddy current magnetic field, and the driving force is generated by the reaction force of magnetic resistance. A simplified electromagnetic force model of the EDW and a dynamics model of the PMEDS car were established to study the operating mode. It shows that the PMEDS car can achieve suspension when the rotational speed of the EDWs reaches a certain threshold and the critical speed of the EDWs is 600 rpm. With the cooperation of four permanent magnet EDWs, the PMEDS car can achieve stable suspension and the maximum suspension height can reach 7.3 mm. The working rotational speed of EDWs is 3500 rpm. At the same time, the movement status of the PMEDS car can be controlled by adjusting the rotational speed of rear EDWs. The functions of propulsion, acceleration, deceleration, and braking are realized and the feasibility of the PMEDS car system is verified.

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Section: Introductionmentioning

confidence: 99%

Design and Operating Mode Study of a New Concept Maglev Car Employing Permanent Magnet Electrodynamic Suspension Technology

et al. 2021

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“…This model reduces the complexity and calculation quantity of 3D FEM to a certain extent, but it still has limitations in occasions requiring fast calculation of radial levitation force. In fact, compared with the theoretical calculation, the experimental measurements are preferred to obtain the radial levitation force [12][13][14][15]. Owing to the thin air-gap between the stator and the rotor, the allowable displacement of the PM rotor is very small when performing the experimental measurements.…”

Section: Introductionmentioning

confidence: 99%

Simplified calculation for the radial levitation force of radial‐type superconducting magnetic bearing

Zhang

et al. 2018

IET Electric Power Applications

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It is usually difficult to obtain the radial levitation force of the radial-type superconducting magnetic bearing (SMB) due to the massive numerical calculations and the sophisticated experimental measurements. This study presents a method for fast calculating the radial levitation force of radial-type SMB, which is based on the infinitesimal method and the 2D finite-element method. During the modelling, the radial-type SMB is assumed to be composed circumferentially of infinite superconductorpermanent magnet (SC-PM) infinitesimals with shape of rectangular thin slice. The dependence of levitation force for the SC-PM infinitesimal on the air-gap length between the SC stator and the PM rotor can be obtained using the 2D finite-element model established in Cartesian coordinate system. Moreover, a simplified analytical model of calculating radial levitation force is developed based on the infinitesimal method and the circumferential distribution formula of non-uniform air-gap when the PM rotor exhibits radial eccentricity. The results of theoretical calculation and experimental measurement of radial levitation force show a good agreement, which verifies the feasibility of the proposed method. It has the advantages of fastness and easiness, and can be used as a theoretical tool for the design, optimisation and performance prediction of the radial-type SMB.

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“…Numerical models using finite element methods (FEM) are also proposed in the literature to improve the precision of the results [6][7][8]. Furthermore, experimental procedures are proposed in the literature to measure the stiffness and the damping of passive, active or superconductor magnetic bearings [7][8][9][10][11][12][13]. Almost all of these methodologies use a uniaxial load cell measuring the force generated in a single direction, which results in an incomplete characterization.…”

Section: Introductionmentioning

confidence: 99%

Reduced-Friction Passive Magnetic Bearing: Innovative Design and Novel Characterization Technique

2013

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Friction is mostly unwanted in rotating machines. In order to reduce its impact on the system, the integration of magnetic bearings is frequently regarded as a valid solution. In rotating systems like flywheel energy storage systems (FESS), mechanical losses created by mechanical bearings greatly reduce the overall performance. Magnetic bearings are thus frequently integrated in FESS to eliminate mechanical losses. The simple design of passive magnetic bearings (PMBs), their inherent security, and their very low friction make them perfect candidates for FESS. The main objective, and most important contribution of this paper, is to document an innovative PMB that minimizes energy losses induced by the axial thrust bearing, and to document the methodology used to measure its stiffness and damping. Although PMBs are fairly well documented in literature, no other PMB is designed to reduce the friction generated by the thrust bearing. In order to promote their integration, it is critical to identify their mechanical properties such as stiffness and damping. Hence, another contribution of this paper is to propose a new way to easily characterize any magnetic bearing topology to replace available techniques that only provided the properties for a precise configuration of the bearing. The new technique provides an unprecedented mapping of the forces generated by complex combinations of permanent magnets. Experimental results show that the new PMB can be configured to effectively reduce the force applied to the thrust bearing, resulting in lower friction. This friction reduction is achieved while allowing the proper operation of the bearing. Results

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Fabrication of HTS Bearings With Ton Load Performance

Cited by 38 publications

References 5 publications

Design and Operating Mode Study of a New Concept Maglev Car Employing Permanent Magnet Electrodynamic Suspension Technology

Design and Operating Mode Study of a New Concept Maglev Car Employing Permanent Magnet Electrodynamic Suspension Technology

Simplified calculation for the radial levitation force of radial‐type superconducting magnetic bearing

Reduced-Friction Passive Magnetic Bearing: Innovative Design and Novel Characterization Technique

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