Superconducting magnet device

Patent metadata

Field	Value
Publication number	US-10056178-B2
Application number	US-201415111620-A
Country	US
Kind code	B2
Filing date	Jan 27, 2014
Priority date	Jan 27, 2014
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

The superconducting magnet device reduces the number of connections within and/or the number of wires leading out of a superconducting coil winding and promptly starts expending the magnetic energy in a superconducting coil operating in a persistent-current mode when the superconducting coil increases in temperature or transitions to normal conductivity. This invention provides a superconducting magnet device that has the following: a superconducting coil connected to an excitation power supply; a persistent-current switch connected to the superconducting coil; a heater that controls the temperature of the persistent-current switch; a current source that is connected in parallel with the persistent-current switch and has a different polarity from the excitation power supply; a driving circuit connected to the heater and the current source; and a signal-inputting means for inputting a signal to the driving circuit. The driving circuit operates the heater and the current source when the signal is inputted thereto.

First claim

The invention claimed is:

1. A superconducting magnet device, comprising:
a superconducting coil connected to a power supply for excitation;
a persistent current switch connected to the superconducting coil;
a heater configured to control a temperature of the persistent current switch;
a current source connected in parallel to the persistent current switch and having a polarity different from that of the power supply for excitation;
a driving circuit connected to the heater and the current source; and
signal inputting means for inputting a signal to the driving circuit; wherein
the driving circuit renders the heater and the current source operative when the signal is inputted thereto.

2. The superconducting magnet device according to claim 1 , further comprising:
a good conductor contacting with the superconducting coil; and
a refrigerator connected to the good conductor.

3. The superconducting magnet device according to claim 1 , further comprising:
abnormality detection means disposed for the superconducting coil; wherein
the abnormality detection means is connected to the signal inputting means.

4. The superconducting magnet device according to claim 2 , further comprising:
a driving mechanism provided at part or the entirety of the good conductor connected to the refrigerator; wherein
the good conductor and the refrigerator are separable from each other.

5. The superconducting magnet device according to claim 1 , wherein
the superconducting coil or the persistent current switch is cooled by coolant.

6. The superconducting magnet device according to claim 5 , further comprising:
a measuring element configured to measure a coolant amount of the coolant.

Assignees

• Hitachi Ltd

Inventors

• MIYAZOE Akihisa
• Nakayama Takeshi
• Aoki Manabu

Classifications

• H01F6/04

  Cooling · CPC title

• H01F6/008 Primary

  Electric circuit arrangements for energising superconductive electromagnets · CPC title

• F17C2250/0443

  Flow or movement of content · CPC title

• H01F6/06

  Coils, e.g. winding, insulating, terminating or casing arrangements therefor · CPC title

• G01R33/3815

  with superconducting coils, e.g. power supply therefor · CPC title