Mitsubishi Denki Kabushiki Kaisha

Aisin Seiki Kabushiki Kaisha

Central Japan Railway Company

Toshiyuki Amano

Takeo Kawaguchi

Takashi Inaguchi

Akinori Ohara

Itsuo Kodera

Hideto Yoshimura

Hideo Mita

Yoshihiro Jizo

Motohiro Igarasi

Takayuki Furusawa

Tetsuya Gotou

A cooling apparatus comprises a pulse tube refrigerator (A) having a pressure source (), a cold reservoir (), a condenser (), a pulse tube (), a radiator (), and a phase adjuster (); and a low-temperature container having a liquid reservoir () fixed to a vacuum tank () through heat-insulating support members () and (). The condenser () is fixed to a cold end () of the cold reservoir (), and is disposed in a gas phase portion () of the liquid reservoir (). A hot end of the pulse tube () is fixed to the vacuum tank () and is disposed in such a manner that a cold end () of the pulse tube () is located lower than the hot end and is located in a liquid phase portion () of the liquid reservoir (). The cold end () of the pulse tube () is disposed outside the liquid reservoir () but within the vacuum tank (), and the cold end () of the pulse tube () and the condenser () communicate with each other through piping ().

Cooling device

Superconducting magnet and regenerative refrigerator can be reduced in size of the apparatus and is capable of reducing the evaporating amount of liquid helium. A coil portion second thermal shield 17a and a coil portion thermal shield 8a are disposed so as to enclose a coil portion helium tank 2a which contains superconducting coil 1. Further, a helium portion second thermal shield 17b and a helium reservoir portion thermal shield 8b are disposed so as to enclose a helium reservoir tank 2b which stores liquid helium 3. A coil portion second thermal shield 17a and a coil portion thermal shield 8a are cooled by a coil portion 2-stage type Gifford-McMahon cycle refrigerator 50a while a helium portion second thermal shield 17b and a helium reservoir portion thermal shield 8b are cooled by a helium reservoir portion 2-stage type Gifford-McMahon cycle refrigerator 50b.

Superconducting magnet and regenerative refrigerator for the magnet

Superconducting magnet and regenerative refrigerator can be reduced in size of the apparatus and is capable reducing the evaporating amount of liquid helium. A coil portion second thermal shield 17a and a coil portion thermal shield 8a are disposed so as to enclose a coil portion helium tank 2a which contains superconducting coil 1. Further, a helium portion second thermal shield 17b and a helium reservoir portion thermal shield 8b are disposed so as to enclose a helium reservoir tank 2b which stores liquid helium 3. A coil portion second thermal shield 17a and a coil portion thermal shield 8a are cooled by a coil portion 2-stage type Gifford-McMahon cycle refrigerator 50a while a helium portion second thermal shield 17b and a helium reservoir portion thermal shield 8b are cooled by a helium reservoir portion 2-stage type Gifford-McMahon cycle refrigerator 50b.

A superconducting rotating electric machine has superconducting rotor windings made from a high-temperature superconductor having a critical temperature of at least 78.degree. K. The rotor windings are cooled by a liquid coolant such as liquid nitrogen which is sprayed from the stator directly at the outer surface of the rotor.

Cooling system for superconducting rotating machine

Growing community of inventors

Amagasaki, Japan

Toshiyuki Amano