[미국특허]
SUPERCONDUCTING MAGNET DEVICE AND METHOD FOR LIMITING CURRENT DECREASE IN CASE OF ABNORMALITY THEREIN
원문보기
IPC분류정보
국가/구분
United States(US) Patent
공개
국제특허분류(IPC7판)
H02H-007/00
H01F-006/06
H02H-003/12
출원번호
US-0951263
(2018-04-12)
공개번호
US-0233899
(2018-08-16)
우선권정보
JP-2015-204497 (2015-10-16)
발명자
/ 주소
TAKAHASHI, Masato
MAEDA, Hideaki
HASHI, Kenjiro
NISHIJIMA, Gen
MATSUMOTO, Shinji
NOGUCHI, Takashi
SHIMIZU, Tadashi
출원인 / 주소
RIKEN
인용정보
피인용 횟수 :
0인용 특허 :
0
초록▼
A superconducting magnet device including a superconducting coil formed of a high-temperature superconducting wire, a power supply which supplies current to the superconducting coil, and a protector capable of forming a short-circuit path which short-circuits both ends of the superconducting coil to
A superconducting magnet device including a superconducting coil formed of a high-temperature superconducting wire, a power supply which supplies current to the superconducting coil, and a protector capable of forming a short-circuit path which short-circuits both ends of the superconducting coil to each other is installed. Current is made to flow from the power supply to the superconducting coil in a superconducting state, and the superconducting coil thereby generates a magnetic field. After the magnetic field is generated, when an abnormality of the superconducting magnet device is detected, or when the power supply and the superconducting coil are disconnected from each other, the short-circuit path is formed by the protector.
대표청구항▼
1. A method for limiting a current decrease in a superconducting magnet device, comprising: (A) installing the superconducting magnet device including a superconducting coil formed of a high-temperature superconducting wire, a power supply which supplies current to the superconducting coil, and a pr
1. A method for limiting a current decrease in a superconducting magnet device, comprising: (A) installing the superconducting magnet device including a superconducting coil formed of a high-temperature superconducting wire, a power supply which supplies current to the superconducting coil, and a protector capable of forming a short-circuit path which short-circuits both ends of the superconducting coil to each other;(B) making current flow from the power supply to the superconducting coil in a superconducting state, and thereby causing the superconducting coil to generate a magnetic field; and(C) after the magnetic field is generated by the (B), when an abnormality of the superconducting magnet device is detected, or when the power supply and the superconducting coil are disconnected from each other, forming the short-circuit path by the protector;(D) after the power supply and the superconducting coil are disconnected from each other, making current flow again to the superconducting coil from the power supply or from a new power supply as a substitute for the power supply, in a state where current is circulating through the short-circuit path and the superconducting coil; and(E) increasing current flowing from the power supply to the superconducting coil in the (D), and removing the short-circuit path when it is detected that magnitude of current flowing through the short-circuit path becomes equal to or smaller than a set value. 2. The method for limiting a current decrease according to claim 1, wherein a pair of anti-parallel-connected diodes are connected in parallel and anti-parallel with the superconducting coil. 3. The method for limiting a current decrease according to claim 1, comprising: detecting magnitude of current supplied from the power supply to the superconducting coil;determining whether or not the detected magnitude of the current satisfies a set condition; andwhen it is determined that the magnitude of the current does not satisfy the set condition, forming the short-circuit path by the protector at the (C) for occurrence of an abnormal state. 4. The method for limiting a current decrease according to claim 1, comprising: detecting magnitude of a voltage between two points of a current path that connect the power supply and the superconducting coil;determining whether or not the detected magnitude of the voltage satisfies a set condition; andwhen it is determined that the magnitude of the voltage does not satisfy the set condition, forming the short-circuit path by the protector at the (C) for occurrence of an abnormal state. 5. The method for limiting a current decrease according to claim 1, comprising: when abnormality of the power supply is detected, forming the short-circuit path by the protector at the (C) for occurrence of an abnormal state. 6. A superconducting magnet device comprising: a superconducting coil which is formed of a high-temperature superconducting wire and which generates a magnetic field when current is suppled thereto from a power supply;a protector capable of forming a short-circuit path which short-circuits both ends of the superconducting coil to each other;a short-circuit current detecting unit which detects magnitude of current flowing through the short-circuit path formed by the protector;a short-circuit current comparing unit which determines whether or not the magnitude of the current detected by the short-circuit current detecting unit is equal to or smaller than a set value; anda removal signal output unit which outputs, to an activation device of the protector, a short-circuit removal signal for removing the short-circuit path when a determination result of the short-circuit current comparing unit is affirmative. 7. A superconducting magnet device comprising: a superconducting coil which is formed of a high-temperature superconducting wire and which generates a magnetic field when current is supplied thereto from a power supply;a protector capable of forming a short-circuit path which short-circuits both ends of the superconducting coil to each other; anda pair of anti-parallel-connected diodes connected in parallel and anti-parallel with the superconducting coil. 8. The superconducting magnet device according to claim 6, comprising: a detector which outputs a short-circuit signal when detecting that the superconducting magnet device becomes in an abnormal state; andthe activation device which activates the protector so as to form the short-circuit path when the short-circuit signal is output. 9. The superconducting magnet device according to claim 8, wherein the protector includes a switch, and the short-circuit path is formed by closing the switch. 10. The superconducting magnet device according to claim 6, wherein the power supply is a constant current source which supplies constant current to the superconducting coil, and the constant current flows through the superconducting coil in a direction from one end to the other end of the superconducting coil, and the superconducting magnet device comprises a pair of anti-parallel-connected diodes connected in parallel and anti-parallel with the superconducting coil. 11. The superconducting magnet device according to claim 8, wherein the detector includes: a supply current detecting unit which detects magnitude of current supplied from the power supply to the superconducting coil;a supply current comparing unit which determines whether or not the magnitude of the current detected by the supply current detecting unit satisfies a set condition; anda short-circuit signal outputting unit which outputs the short-circuit signal for occurrence of an abnormal state, when the supply current comparing unit determines that the magnitude of current does not satisfy the set condition. 12. The superconducting magnet device according to claim 8, wherein the detector includes: a voltage detection unit which detects magnitude of a voltage between two points of a current path that connects the power supply and the superconducting coil;a voltage comparison unit which determines whether or not the magnitude of the voltage detected by the voltage detection unit satisfies a set condition; anda short-circuit signal outputting unit which outputs the short-circuit signal for occurrence of an abnormal state, when the voltage comparison unit determines that the magnitude of the voltage does not satisfy the set condition. 13. The superconducting magnet device according to claim 11, wherein the set condition is a condition that the detected magnitude is larger than a threshold value, or a condition that the detected magnitude falls within a set range. 14. The superconducting magnet device according to claim 12, wherein the set condition is a condition that the detected magnitude is larger than a threshold value, or a condition that the detected magnitude falls within a set range. 15. The superconducting magnet device according to claim 8, wherein the detector includes: a power abnormality detecting unit which detects an abnormality of the power supply; anda short-circuit signal outputting unit which outputs the short-circuit signal for occurrence of an abnormal state, when the power abnormality detecting unit detects an abnormality of the power supply. 16. The superconducting magnet device according to claim 8, wherein when receiving the short-circuit removal signal, or when receiving both of the short-circuit removal signal and a short-circuit removal command, the activation device removes the short-circuit path formed by the protector. 17. The superconducting magnet device according to claim 9, comprising a plurality of magnetic field generators each including the superconducting coil and the protector, wherein the power supply is shared by the plurality of magnetic field generators, andthe superconducting magnet device comprises:a coil state detecting unit which is provided in each of the magnetic field generators and which detects magnitude of current flowing through the superconducting coil or magnitude of a magnetic field generated by the superconducting coil;a current supply switch which is provided in each of the magnetic field generators and which is driven between a closed position at which current is supplied from the power supply to the magnetic field generator and an open position at which the magnetic field generator is disconnected from the power supply; anda control unit which causes the current supply switch in each of the magnetic field generators to be driven to the closed position when the magnitude detected by the coil state detecting unit becomes equal to or smaller than a reference value, in a state where the switch of the protector is closed in the magnetic field generator. 18. The superconducting magnet device according to claim 17, comprising: a supply current detecting unit which is provided in each of the magnetic field generators and which detects current supplied from the power supply to the magnetic field generator; anda short-circuit current detecting unit which is provided in each of the magnetic field generators and which detects magnitude of current flowing through the short-circuit path,wherein after causing the current supply switch of the magnetic field generator to be driven to the closed position, the control unit:causes the switch of the protector to be driven to the open position when a current value detected by the short-circuit current detecting unit becomes equal to or smaller than a set value in a course of increasing of current supplied from the power supply to the magnetic field generator;then causes the switch of the protector to be driven to the closed position when a current value detected by the supply current detecting unit becomes a rated current value in a course of further increasing of current supplied from the power supply to the magnetic field generator; andthen causes the current supply switch to be driven to the open position when the current value detected by the supply current detecting unit becomes zero in a course of decreasing of current supplied from the power supply to the magnetic field generator. 19. The superconducting magnet device according to claim 7, wherein when receiving the short-circuit removal signal, or when receiving both of the short-circuit removal signal and a short-circuit removal command, the activation device removes the short-circuit path formed by the protector. 20. The superconducting magnet device according to claim 7, wherein the power supply is a constant current source which supplies constant current to the superconducting coil, and the constant current flows through the superconducting coil in a direction from one end to the other end of the superconducting coil.
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