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Experimental characterization of the axial rotational instability of the cryogenic rotation mechanism using synchronous motor and superconducting magnetic bearing
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Experimental characterization of the axial rotational instability of the cryogenic rotation mechanism using synchronous motor and superconducting magnetic bearing
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Experimental characterization of the axial rotational instability of the cryogenic rotation mechanism using synchronous motor and superconducting magnetic bearing
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Journal Article
Experimental characterization of the axial rotational instability of the cryogenic rotation mechanism using synchronous motor and superconducting magnetic bearing
2025
Overview
We report the experimental characterization of the rotational instability of a cryogenic rotation mechanism, which uses a superconducting magnetic bearing (SMB) and a synchronous motor and operates at about 10 K in a vacuum environment. We conducted rotation tests: driving the rotor and reconstructing the rotational frequency of the rotor. We identified the rotational frequency oscillations and the damping of its amplitude around the target rotational frequency set by the motor drive electronics. The amplitude of the oscillation of about 0.005 Hz at the rotational frequency of 0.77 Hz with the damping coefficient of about 0.02 s −1 . We compared this damping coefficient to the energy loss by the rotational frequency spin down without any driving torque. We found that the two damping coefficients agree within a factor of two. Based on the analysis, we narrowed down the cause of the oscillation to the low-torque/low-friction rotation mechanism together with the high-purity copper wires used in drive motor coils as the source of eddy current.
