| 摘要 |
PURPOSE:To contrive reduction of cost and to make a power source at each magnet unnecessary by exciting plural superconductive magnets of different working current. CONSTITUTION:A power switch S is closed when permanent switches P1, P2 kept in a liquid helium H with magnets M1, M2 are conductive, that is, open. A working current I1 of the magnet M1 is obtained by controlling a controller R. This working current I1 flows through the magnet M2, that is, I1=I3. Then, the switch P1 is turned to a superconductive point. A working current I3 of the magnet M2, which actuates at the maximum working current through increasing a current by controlling the controller R, is obtained. The switch P2 is turned to a superconductive point from a normal conductive point. A permanent mode is excited when the power switch S is opened. This means that a permanent current of I1 flows in a loop between the magnet M1 and the switch P1 and a permanent current of I3 flows in a loop between the magnet M2 and the switches P1, P2. |
