초록 ▼

A composite magnet comprising a core of R-Ba-Cu-O type bulk superconductor (R denotes rare-earth elements) made by melt process, enclosed around it with normal conductive or superconductive coil, or a composite magnet including a center of normal conductive or superconductive coil, enclosed around i

A composite magnet comprising a core of R-Ba-Cu-O type bulk superconductor (R denotes rare-earth elements) made by melt process, enclosed around it with normal conductive or superconductive coil, or a composite magnet including a center of normal conductive or superconductive coil, enclosed around it with ring-shaped R-Ba-Cu-O type bulk superconductor (R denotes rare-earth elements) made by melt process is disclosed, which allows easy control of generating magnetic field and gives a relatively strong magnetic field even at a temperature as high as that of liquid nitrogen.

대표청구항 ▼

A variable magnetic field strength composite magnet, comprising: a core of R-Ba-Cu-O bulk superconductor, where R is at least one rare-earth element, said superconductor being made by a melt process; and an electrically conductive coil driven by an external power source enclosing said core; wherein

A variable magnetic field strength composite magnet, comprising: a core of R-Ba-Cu-O bulk superconductor, where R is at least one rare-earth element, said superconductor being made by a melt process; and an electrically conductive coil driven by an external power source enclosing said core; wherein the magnetic field of the magnet is controlled by passing a current through the coil while the superconductor is cooled to below a critical temperature to establish a magnetic field in said superconductor and passing a current produced by said external power source of opposite polarity through the coil to reduce the magnetic field.