HTS-Tape Magnetic Bearing for Ultra High-Speed Turbo Motor

Oliveira, Roberto; Zeng, Xianwu; Pei, Xiaoze; Burke, Richard

doi:10.1109/tasc.2023.3253064

Cited by 2 publications

(1 citation statement)

References 25 publications

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“…At the same time, regardless of the type of motor intended for a high-speed drive, the problem of bearing losses arises. There is an increasing number of publications discussing drive systems in which magnetic bearings are used (El-Shourbagy et al , 2021; Farhan et al ., 2020; Oliveira et al , 2023; Yu et al , 2020).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the mechanical limitations of the selected high-speed electric motor

Korkosz

Noga

Rogalski

2023

AEAT

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Purpose The study aims to show the influence of selected mechanical parameters of the rotor on the maximum speed and parameters of the electric motor. Design/methodology/approach A simplified mechanical analysis of the rotor of the electric motor was conducted, determining the safety factor of the motor. An analysis of the impact of key rotor parameters (significant from the mechanical strength perspective) on the electromagnetic parameters and the safety factor of the selected high-speed electric motor was carried out. The influence of changes in the rotor’s geometrical dimensions (centrifugal force) on the electromagnetic parameters of the electric motor was shown. Findings The study shows the impact of changes in selected rotor parameters on electromagnetic parameters and the safety factor of a high-speed electric motor (at its required operating point of 45,000 rpm). The dependence of the safety factor as a function of the maximum motor speed was determined for the proposed rotor modifications. Practical implications The proposed modifications can be used in larger drive systems. They have practically no impact on increasing the value of the motor’s moment of inertia (they do not degrade the dynamics of the motor’s operation). Originality/value It was proposed to use a new design coefficient which is in relation to the motor’s safety coefficient. It has been shown that a minimal modification of the motor rotor allows to increase its maximum speed by several dozen per cent (while maintaining the safety factor). It has also been shown that when operating at maximum speed within the safe range, the change in the geometrical dimensions of the rotor hardly influences the change in the value of the centrifugal force.

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Section: Introductionmentioning

confidence: 99%

Analysis of the mechanical limitations of the selected high-speed electric motor

Korkosz

Noga

Rogalski

2023

AEAT

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A fully superconducting magnetic bearing with a jointless coil excited by a superconducting dynamo

Espenhahn,

Hühne

2024

Supercond. Sci. Technol.

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Superconducting magnetic bearings usually combine a setup of permanent magnets and superconducting bulks. The bearing size is typically scaled up to increase the levitation force as the force density is limited in such setups due to the magnetic flux density and its spatial gradient. As alternative, the permanent magnets might be replaced by a superconducting coil.To test this, jointless coils were prepared by a wind and flip technology using coated conductors of different tape manufacturers. The realized pancake coils were studied at liquid nitrogen temperature. Numerical simulations yielded a magnetic field of up to 0.5 T at 77 K for coils with a inner diameter of 20 mm. The prepared coils were charged with a superconducting dynamo, in which two magnet configurations were tested. A clear dependence on the magnet size and frequency was found for the charging characteristics. A magnetic field of about 0.3 T at 77 K was imprinted in one of the coils. However, a degradation of the coils was found over time indicated by some delamination at the cutted edges, which reduced the maximum achievable magnetic field after a few weeks.Nevertheless, a fully superconducting bearing was realized with by combining the jointless coil with an additional YBCO bulk. After charging the coil with the dynamo, a levitation force of up to 10 N at 77 K was measured under zero-field cooling conditions. The generated levitation force decayed only slightly after charging indicating low losses in the coil.

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HTS-Tape Magnetic Bearing for Ultra High-Speed Turbo Motor

Cited by 2 publications

References 25 publications

Analysis of the mechanical limitations of the selected high-speed electric motor

Analysis of the mechanical limitations of the selected high-speed electric motor

A fully superconducting magnetic bearing with a jointless coil excited by a superconducting dynamo

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