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US 8,138,867 B2Granted
Superconducting magnet device
AssigneeMitsubishi Electric Corporation
InventorHajime Tanabe
Life of this patent
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Abstract
A superconducting magnet device includes a main coil that generates a static magnetic field in an imaging space and a disturbance magnetic field compensation coil that suppresses influences of a variable magnetic field flowing inside from outside in the imaging space. The main coil is divided to at least two diode circuits. The disturbance magnetic field compensation coil has at least one coil formed of minus turns so that mutual inductances with the respective diode circuits in the main coil are made minimum.
Claims5
A superconducting magnet device, comprising:
- a main coil that generates a static magnetic field in an imaging space;
- and
- a disturbance magnetic field compensation coil that suppresses influences of a variable magnetic field flowing in from outside in the imaging space, wherein:
- the main coil is formed of a closed loop circuit having a plurality of coils divided into at least two diode circuits;
- the disturbance magnetic field compensation coil has at least one coil formed of minus turns;
- and
- mutual inductance of the main coil and the disturbance magnetic field compensation coil is optimized, so that magnetic coupling between the main coil as a whole and the disturbance magnetic field compensation coil is reduced and so that magnetic coupling between the respective diode circuits in the main coil and the disturbance magnetic field compensation coil is reduced.
4 more elements
Dependencies are inferred from the claim text.