Numerical evaluation of rotation speed degradation of SMB in the 100 kWh superconducting flywheel

Masaie, Issei; Demachi, Kazuyuki; Matsunaga, Kentaro; Uesaka, Mitsuru

doi:10.1016/j.physc.2004.01.103

Cited by 2 publications

(4 citation statements)

References 4 publications

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“…Once a flywheel rotor is optimally designed, only the scaling factor c needs to be determined using Equation (16) to design another rotor with a different energy capacity. Then, the optimized SED remains unchanged as in Equation (18). The rotating speed should be inversely proportional to the scaling factor as in Equation (12).…”

Section: A Stress Analysis Of the Scaled Multi-rim Rotormentioning

confidence: 99%

“…Over the last five years, flywheel systems of 0.5 kWh and 5 kWh have been developed, and the current goal is to develop a 100-kWh flywheel system. Several centers throughout the world are also developing high energy capacity flywheel systems using the sub-model flywheel system [14][15][16][17][18][19]. Once the scaling effects are fully understood, the spin test to characterize the multi-rim type material systems can be performed on the sub-scale model to avoid high testing costs.…”

Section: Introductionmentioning

confidence: 99%

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Design of a Hybrid Composite Flywheel Multi-rim Rotor System using Geometric Scaling Factors

Kim

Han

2008

Journal of Composite Materials

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The effects of geometric scaling on the static and dynamic behavior of a multi-rim hybrid press-fitted composite flywheel rotor are investigated and applied to its design procedure. It is verified that the stresses among the scaled multi-rim hybrid rotors remain the same as long as press-fit interferences are linearly scaled, curing temperature remains unchanged, and the rotational speed is inversely proportional. With the linearly scaled supporting stiffness of the scaled rotor and shaft, a relationship between inversely scaled critical speeds and rotational speeds remains unchanged. Double rim rotors of 5 kWh and 100 kWh energy storage are designed by scaling an optimized 0.5 kWh multi-rim rotor. Then, the rotors of 5 kWh were manufactured by wet-winding E-glass and T-700 fibers with a low-temperature cured epoxy system.

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Section: A Stress Analysis Of the Scaled Multi-rim Rotormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a Hybrid Composite Flywheel Multi-rim Rotor System using Geometric Scaling Factors

Kim

Han

2008

Journal of Composite Materials

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“…1–3 Especially for the attitude control and energy storage flywheel (ACESF), not only is the speed of the rotor high but also the mass of the flywheel, especially the mass of the rotor are restricted strictly. 4,5 The flywheel rotor system, mostly supported by frictionless bearings such as magnetic bearings 6–11 or superconducting magnetic bearings, 12–20 generally consists of a metallic shaft, a rotor of composite materials and a hub that connects the rotor with the shaft. The total kinetic energy stored in the flywheel is given by Iω2/2, where I is the mass moment of inertia of the rotor around the spin axis and ω is the angular velocity of the rotor.…”

Section: Introductionmentioning

confidence: 99%

“…Substituting it into equation(14) to eliminate C ðiÞ , we have f ðiÞ ¼ I Ã G ðiÞ È ðiÞ G ðiÞ À Á À1 u ðiÞ À I Ã G ðiÞ È ðiÞ G ðiÞ…”

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confidence: 99%

Hollow interference fitted multi-ring composite rotor of the superconducting attitude control and energy storage flywheel

Tang

Zhang

et al. 2013

Journal of Reinforced Plastics and Composites

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The superconducting attitude control and energy storage flywheel is a kind of energy storage flywheel. With respect to this kind of flywheel, a rotor consisting of a hollow hub and three composite cylindrical rings in interference fitted state is presented to achieve high specific energy density. The hollow hub made of high strength steel 18Ni350 is used to change the distribution of centrifugal stress, reduce the maximum radial stress and to ensure the working gap of radial magnetic bearings and motor/generator is constant when the rotor rotates at a high rotary speed. Interference has been introduced between rings or ring and hub to avoid their delamination and eventually increase the maximum speed of the rotor. In order to find out the quantitative relationship among interference, tension force, radial pre-stress and so on, we analyzed the stress distribution of the rotor subjected to centrifugal loads, the initial stresses and displacements of the multi-rings rotor in interference fitted state by mathematical methods and finite element methods. Effects of these factors, such as interference between rings, thickness ratio of rings, different materials of rings and so on, are studied in detail to make clear how they affect the stress distribution of the interference fitted multi-ring composite rotor. The results of this study will give a useful hint for the design, test and manufacture of the composite rotor for the superconducting attitude control and energy storage flywheel.

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Numerical evaluation of rotation speed degradation of SMB in the 100 kWh superconducting flywheel

Cited by 2 publications

References 4 publications

Design of a Hybrid Composite Flywheel Multi-rim Rotor System using Geometric Scaling Factors

Design of a Hybrid Composite Flywheel Multi-rim Rotor System using Geometric Scaling Factors

Hollow interference fitted multi-ring composite rotor of the superconducting attitude control and energy storage flywheel

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