In a cooling structure of a superconducting motor in which a superconducting coil is attached to a rotor, grooves are concavely provided on an outer surface of a rotating shaft that penetrates and is fixed to the rotor. A difference is determined between the cross ghosted signals. A transmission is arranged for transmitting a torque formed during a closing movement of the hinge to a flywheel mass for the accumulation and subsequent aiding and continuation of the closing movement. A latch circuit is coupled between the power voltage, the first terminal and the second terminal to preserve the voltage levels respectively of the first terminal and the second terminal when the memory cell operates in the standby mode. The multiobjective evolutionary algorithm unit determines a Pareto-optimal population in accordance with a genetic algorithm on the basis of a plurality of sets of estimated values. The controller is connected with each of the solenoid valves and controls opening and closing of each of the solenoid valves.