An integrated micro HTS system for energy storage and attitude control for three-axis stabilized nanosatellites

Lee, Eunjeong; Kim, Bongsu; Ko, Jong Soo; Song, Chi Young; Kim, Seong‐Jin; Jeong, Sangkwon; Lee, S.S.

doi:10.1109/tasc.2005.849643

Cited by 7 publications

(2 citation statements)

References 2 publications

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“…In our previous paper, we concentrated on a small-capacity energy storage system for micro-satellites and demonstrated that a small-sized flywheel levitates and rotates above the HTS [8][9][10]. In the first design of the flywheel, the motor and bearing magnets were located in the same plane.…”

Section: Previous Resultsmentioning

confidence: 99%

Advanced design and experiment of a small-sized flywheel energy storage system using a high-temperature superconductor bearing

Lee¹,

Kim²,

Ko³

et al. 2007

Supercond. Sci. Technol.

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A small-sized flywheel energy storage system has been developed using a high-temperature superconductor bearing. In our previous paper, a small-sized flywheel was fabricated and successfully rotated at 38 000 rpm under a vacuum condition. However, a large drag torque was present because of the non-axisymmetric magnetic flux of the motor/bearing magnet and the eddy current loss in the planar stator, resulting in a short spin-down time of 20–30 s and a coefficient of friction of 0.15. This paper presents the design, fabrication and electromagnetic analysis of the flywheel in order to reduce the large drag torque. The advanced flywheel designed for solving the non-axisymmetric magnetic flux problem comprises eight motor magnets and a single bearing magnet, a magnetic screening disc, and an aluminium disc which is 50 mm in diameter and 5 mm in thickness. The eddy current loss in the planar stator is minimized by reducing the contact area between the planar stator and the motor magnets. The maximum rotational speed increases 1.3 times to 51 000 rpm and the spin-down time increases 600 times to 3 h 20 min. On the basis of these results, the coefficient of friction decreases 100 times to 0.001–0.002.

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Section: Previous Resultsmentioning

confidence: 99%

Advanced design and experiment of a small-sized flywheel energy storage system using a high-temperature superconductor bearing

Lee¹,

Kim²,

Ko³

et al. 2007

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The spindown time was very short, within several tens of seconds, and this short spin-down time appeared to be mainly due to air drag. Figure 6 shows the rotational speed according to the input current to the circuit at 12 V. The input power also contains the power consumption of the driver circuit [14]. It was difficult to measure the force-displacement relationship of the HTS bearing in this system because the flywheel including the HTS bearing was small and the levitation force was feeble.…”

Section: Methodsmentioning

confidence: 99%

Experiment and analysis for a small-sized flywheel energy storage system with a high-temperature superconductor bearing

Kim¹,

Ko²,

Jeong³

et al. 2006

Supercond. Sci. Technol.

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This paper presents a small-sized flywheel energy storage system that uses a high-temperature superconductor (HTS) bearing characterized by a non-contacting bearing with no active control. The small-sized flywheel is made up several magnets for a motor/generator as well as an HTS bearing, and they are fitted into a 34 mm diameter, 3 mm thick aluminium disc. For simplicity and miniaturization of the whole system, the small-sized flywheel takes torque directly from a planar stator, which consists of an axial flux-type brushless DC motor/generator.The small-sized flywheel successfully rotated up to 38 000 rpm in a vacuum while levitated above the stator with a gap of about 1 mm. However, there are some eddy current losses in the stator and non-axisymmetry in the magnetic field causing large drag torque. In order to solve these problems, an improved magnet array in the flywheel, including magnetic screening, is proposed and 3D electromagnetic simulations have been conducted.

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Flywheel energy storage systems: A critical review on technologies, applications, and future prospects

Choudhury

2021

Int Trans Electr Energ Syst

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Energy storage systems (ESSs) are the technologies that have driven our society to an extent where the management of the electrical network is easily feasible. The balance in supply-demand, stability, voltage and frequency lag control, and improvement in power quality are the significant attributes that fascinate the world toward the ESS technology. However, being one of the oldest ESS, the flywheel ESS (FESS) has acquired the tendency to raise itself among others being eco-friendly and storing energy up to megajoule (MJ). Along with these, FESS also surpasses the quality of high power density, longer life cycle, higher rate of charge and discharge cycle, and greater efficiency. In this article, an overview of the FESS has been discussed concerning its background theory, structure with its associated components, characteristics, applications, cost model, control approach, stability

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An integrated micro HTS system for energy storage and attitude control for three-axis stabilized nanosatellites

Cited by 7 publications

References 2 publications

Advanced design and experiment of a small-sized flywheel energy storage system using a high-temperature superconductor bearing

Advanced design and experiment of a small-sized flywheel energy storage system using a high-temperature superconductor bearing

Experiment and analysis for a small-sized flywheel energy storage system with a high-temperature superconductor bearing

Flywheel energy storage systems: A critical review on technologies, applications, and future prospects

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