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 3 publications

(1 citation statement)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Korkosz

Noga

Rogalski

2023

AEAT

View full text Add to dashboard Cite

show abstract

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

Espenhahn,

Hühne

2024

Supercond. Sci. Technol.

View full text Add to dashboard Cite

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.

show abstract

Real-time proof of concept for a hybrid magnetic bearing with improved damping and reduced control complexity

Chiu,

Liu,

Chou

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

This paper presents a novel Axial Hybrid Magnetic Bearing (AHMB) and its corresponding control approach to overcome the constraints of conventional Active Magnetic Bearings (AMB) and Passive Magnetic Bearings (PMB). The HMB architecture comprises an independent magnetic circuit for the Permanent Magnet (PM) and AMB, resulting in improved damping and reduced control complexity. A Permanent Magnet Actuator Mechanism (PMAM) and its control algorithm were developed to render the HMB system suitable for counteracting diverse loads. Real-time experiments validated the efficacy of the HMB in mitigating external disturbances. Experimental results showed that when the load was added to the AHMB system, the rotor could be regulated to its nominal position within 1.5 s by the AMB. Moreover, the control currents to the AMB coil can be effectively reduced by ≥50%. The proposed hybrid magnetic bearing has potential applications including, but not limited to, cleanroom equipment, high-speed air compressors, high-speed turbomachinery, and flywheel energy storage systems.

show abstract

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

Cited by 3 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

Real-time proof of concept for a hybrid magnetic bearing with improved damping and reduced control complexity

Contact Info

Product

Resources

About