Abstract
A 2 kW/28.5 kJ superconducting flywheel energy storage system (SFESS) with a radial-type high-temperature superconducting (HTS) bearing was set up to study the electromagnetic and rotational characteristics. The structure of the SFESS as well as the design of its main parts was reported. A mathematical model based on the finite element method (FEM) was established to research the electromagnetic characteristics of the HTS bearing during the levitation process, which show that a part of the magnetic flux penetrates into the edge of the HTS bulks and then goes back to the opposite pole of the permanent magnet rotor (PMR). The induced current mainly distributes in the edge of the HTS bulks, indicating that larger force acts on the edge part of the HTS bulks and probably causes them to crack. The free rotations of the rotor at different steady-state speeds of 2500–5000 rpm and its radial vibration were displayed. The induced voltage of the stator winding of the motor in this process was analyzed. The rotational characteristics are related to the vibration of the rotor. Below the resonant frequency, the vibration increases significantly with the speed. Enhancing the radial stiffness to limit the vibration amplitude of the rotor is an effective approach to improve the speed.
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This work is supported in part by the National Natural Science Foundation of China (Nos. 51674169, 51677180, 51477168, and 11572358) from the Chinese Ministry of Science and Technology, supported by the National Key Research and Development Program of China (No. 2018YFB0905503), supported by the Natural Science Foundation of Hebei Province of China (No. E2018210144) and supported by the Department of Education of Hebei Province of China (No. ZD2017069).
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Yu, Z., Zhang, G., Qiu, Q. et al. Electromagnetic and Rotational Characteristics of a Superconducting Flywheel Energy Storage System Utilizing a Radial-Type High-Temperature Superconducting Bearing. J Supercond Nov Magn 32, 1605–1616 (2019). https://doi.org/10.1007/s10948-018-4875-5
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DOI: https://doi.org/10.1007/s10948-018-4875-5