Experimental Apparatus and its Operational Characteristics for MHD Rotating Machine with Superconducting Rotor

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This paper presents the construction and operational characteristics of the experimental apparatus of MHD rotating machine with superconducting rotor, which has the electromechanical energy conversion function based on the inductive interactions between travelling magnetic field produced by the rotor and MHD working fluid.The machine consists of a rotating-dewar type superconducting rotor and a coaxially rotating metal cylinder which simulates the liquid metal MHD working fluid, and both of them are driven separately by speed-controlled driving motors.The superconducting magnets installed in the rotor has the 8 shaped winding whose outer diameter is 11cm and hight is 11cm, and with the excitation current of 200A (rating), it produces screw type magnetic field in the inductive interaction region of the cylinder with the peak value of 0.2Wb/m2, whereas the avarage field strength reaches almost 4Wb/m2 inside the winding.In this condition, mutual interaction force is 30N in the peripheral direction and 8N in the axial direction and the total driving power of motors is 1, 300W when the relative rotation speed of the rotor and the cylinder is 800rpm.Observed characteristics of this machine are for the most part in agreement with those estimated by the theoretical analysis.
公益社団法人低温工学・超電導学会 (旧社団法人低温工学協会)の論文