Development of Superconducting Magnetic Bearing for 300 kW Flywheel Energy Storage System

Mukoyama, S.; Nakao, Kengo; Sakamoto, H.; Matsuoka, Taro; Nagashima, K.; Ogata, Masafumi; Yamashita, Tomohisa; Miyazaki, Yoshiki; Miyazaki, Kazufumi; Maeda, Tadakazu; Shimizu, Hideki

doi:10.1109/tasc.2017.2652327

Cited by 71 publications

(27 citation statements)

References 2 publications

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“…At the high rotational speed desired, housing the system in a vacuum is required to reduce windage friction that would otherwise result in high drag. Frictionless non-contact magnetic bearings are also required as mechanical bearings would not be able to operate continuously due to frictional losses and wear [18]. In the flywheel energy storage system, the homopolar motor/generator is located between two glass fiber reinforced polymer flywheels as shown in Figure 2.…”

Section: Machine Configurationmentioning

confidence: 99%

Superconducting AC Homopolar Machines for High-Speed Applications

et al. 2018

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This paper presents a novel high-speed alternating current (AC) homopolar motor/generator design using stationary ReBCO excitation windings. Compact, lightweight, high-efficiency motors and generators are sought for a multitude of applications. AC homopolar synchronous machines are an ideal choice for such applications as these machines enable very high rotational frequencies. These machines include both AC armature winding and direct current (DC) excitation winding within the stationary part of the machine. The stationary excitation winding magnetizes a solid steel rotor, enabling operating speeds limited only by the mechanical stress limit of the rotor steel. The operating speeds are many multiples of conventional power 50/60 Hz machines. Significant cooling requirements limit machines of this type utilizing copper excitation windings to only a few kilowatts. However, megawatt ratings become possible when superconductor coils are used. This paper describes the design and analysis of an AC homopolar machine in the context of developing a 500 kW flywheel system to be used for energy recovery and storage in commuter rail subway systems. Different approaches are discussed for an AC armature employing conventional copper coils. Challenges of building and cooling both armature and field coils are discussed and preferred approaches are suggested. Calculations of the machine performance are then made.

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Section: Machine Configurationmentioning

confidence: 99%

Superconducting AC Homopolar Machines for High-Speed Applications

et al. 2018

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“…Recently, a realistic 300-kW FESS using the HTS magnetic bearing has been developed, which was claimed to be the world's largest-class FESS in 2015 [58]. In this FESS, the rotor coupled with three YBCO HTS plates are levitated by five REBCO HTS coils located in the stator.…”

Section: Off-board Energy Storagementioning

confidence: 99%

State-of-the-Art Electromagnetics Research in Electric and Hybrid Vehicles (Invited Paper)

Chau¹,

Jiang²,

Han³

et al. 2017

PIER

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Abstract-There is no doubt that electrified vehicles are superseding internal combustion engine vehicles for road transportation. Among them, electric vehicles (EVs) have been identified as the greenest road transportation while hybrid EVs have been tagged as the super ultra-low emission vehicles. In this paper, the definition, classification, merits and demerits of electric and hybrid vehicles are first introduced. Then, after revealing their multidisciplinary technologies and development trends, the state-of-the-art electromagnetics research in electric and hybrid vehicles are discussed, with emphasis on electric motors for electric propulsion, electric machine systems for hybrid propulsion, wireless power transfer technologies for park-and-charge a well as move-and-charge, electromagnetic interference and compatibility issues in EVs, electromechanical flywheels for energy storage and magnetic sensors for EV operation. Meanwhile, the development trend of these research areas is revealed.

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“…One of the most promising features of magnetic bearings is that the dynamic performance of the shaft is able to be shaped to different applications. ese superior characteristics make magnetic bearings widely used in various fields, such as flywheels and high-speed motors [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Vibration Torque Suppression for Magnetically Suspended Flywheel Using Improved Synchronous Rotating Frame Transformation

Peng

Cai

Deng

et al. 2019

Shock and Vibration

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Synchronous vibration, a common issue in active magnetic bearing (AMB) system, is mainly caused by mass imbalance of the rotor. It comes with high-power consumption and serious impact on the housing base, dramatically degrading the performance of AMB. Magnetically suspended flywheel (MSFW), which owns a flat rotor and consequently shows strong gyroscopic effects even at low operating speed, requires additional attention not only for suppressing the synchronous vibration but also for maintaining the overall stability faced with the coupled dynamics. In this work, in order to suppress the vibration torques in MSFW with significant gyroscopic effects, an improved synchronous rotating frame- (SRF-) based control method is proposed. The proposed method introduces the compensation phase for stability adjustment and aims at simultaneously suppressing the synchronous components in the coupled axes. Firstly, the vibration torque model of MSFW is established, and the baseline control strategy for suspension and gyroscopic effects restrain is derived. Then, the principle and implementation of the improved SRF-based vibration torque method are analyzed, which aims at suppressing the synchronous vibration torques through attenuating synchronous components in coil currents. Moreover, the stability of the overall closed-loop system is analyzed. Finally, the effectiveness of the proposed method is verified through simulation and experimental results.

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Development of Superconducting Magnetic Bearing for 300 kW Flywheel Energy Storage System

Cited by 71 publications

References 2 publications

Superconducting AC Homopolar Machines for High-Speed Applications

Superconducting AC Homopolar Machines for High-Speed Applications

State-of-the-Art Electromagnetics Research in Electric and Hybrid Vehicles (Invited Paper)

Vibration Torque Suppression for Magnetically Suspended Flywheel Using Improved Synchronous Rotating Frame Transformation

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