Effects of Spin-Up Rate on Internal Resonance in a High-Tc Superconducting Bearing System

Abstract

This research investigates transient behaviors of a rotor passing through resonance in a highsuperconducting bearing system. Such a low-damping multi-degree-of-freedom system, subjected to nonlinear force, can show complex dynamical behaviors, in which energy transfer occurs between modes through nonlinear coupling. Our numerical and experimental results show that, in a system of a high-Tc superconducting bearing, internal resonance can occur even in transient cases where the rotor passes through resonance. Effects of the internal resonance and also effects of the spin-up rate on the transient dynamics of the rotor have been examined and clarified by changing the period of increasing voltage applied to a D.C. motor for rotating the rotor.

An overview of Boeing flywheel energy storage systems with high-temperature superconducting bearings

“…High-temperature superconducting (HTS) bearings offer the potential for extremely low rotational loss and have been studied for a number of applications [1][2][3][4][5][6][7][8][9][10][11]. In particular, HTS bearings enable high-efficiency flywheel diurnal energy storage, and the technological development of flywheel energy storage that use HTS bearings has been pursued at many different laboratories worldwide [12][13][14][15][16][17].…”