# US 5,710,531 A · Static field converter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,710,531 A - Document ID: US5710531A - Status: Granted - Kind: A - Application number: 08/654,699 - Filed: 1996-05-29 - Granted: 1998-01-20 - Earliest claimed: 1996-05-29 - Inventors: Andrew Abolafia - Web page: https://patentgrep.com/patent/US5710531A ## CPC - H02K 19/18: having windings each turn of which co-operates only with poles of one polarity, e.g. homopolar generators - H02K 21/40: with flux distributors rotating around the magnets and within the armatures - H02K 55/06: of the homopolar type - Y02E 40/60: Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment - Y10S 505/879: Magnet or electromagnet - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A device for the conversion of a static magnetic field into electrical energy comprising a permanent or electromagnet for establishing a stationary (static) magnetic field, one or more coils responsive to the magnetic field, a switch to periodically place a load across said responsive coils, and a hemispherical diamagnetic insulating element to periodically shield the coils from the magnetic field to produce electrical energy in the coils. The responsive coil may be cylindrical and totally surround one pole (half) of a magnetic dipole. The insulating element is rotatable around the magnet and is to alternately shield and expose the coil to the field of the magnet. The switch periodically opens and closes the coil circuit corresponding of the rotation of the shield. ## Claims ### Claim 1 A static field converter comprising: support means; magnetic means for establishing a magnetic field mounted on said support means; responsive means which is responsive to the magnetic field established by said magnetic means mounted on the support means; superconductive shielding means mounted on the support means, said shielding means being movably mounted on said support means such that it can be moved around said magnetic means and said responsive means to alternately shield and unshield the responsive means from the magnetic field of the magnetic means; switching means connected to said responsive means which can be opened and closed as the shielding means moves around the magnetic field produced by the magnetic means; and the magnetic means is positioned at least partially within the responsive means. ### Claim 2 (depends on 1) A field converter according to claim 1, where the shielding means consists of a hemisphere of superconductive material which is rotatably mounted on the support means between the magnetic means and the responsive means such that the shielding means rotates around the magnetic means, periodically shielding and unshielding the responsive means from the magnetic flux of the magnetic means. ### Claim 3 (depends on 2) A field converter according to claim 2, wherein there is a flux guide of ferro-magnetic material positioned between the magnetic means and the shielding means which completely encloses the magnetic means. ### Claim 4 (depends on 2) A field converter according to claim 2, wherein the shielding means has a non-superconductive hemisphere opposite the hemisphere of superconductive material to form a single sphere containing superconductive and non-superconductive portions in which the magnetic means is mounted. ### Claim 5 (depends on 2) A field converter according to claim 2 wherein there is a cooling means for maintaining the shielding means below the transition temperature of the superconductive material from which it is formed. ### Claim 6 (depends on 2) The static field converter of claim 2, where at least two responsive means are mounted on either end of the magnetic dipole. ### Claim 7 (depends on 6) The static field converter of claim 6, where each of the responsive means consists of a coil of electrically conductive, insulated wire wound in the form of a cylinder larger in diameter than the diameter of the superconductive hemisphere of the shielding means, positioned such that when the hemisphere of the shielding means is fully rotated into one of said responsive means, it completely surrounds the portion of the magnetic means positioned in said responsive means. ### Claim 8 (depends on 1) A field converter according to claim 1, wherein a driving means rotates the shielding means around the magnetic means. ### Claim 9 (depends on 1) A field converter according to claim 1, where the shielding means consists of a superconductive material which is rotatably mounted on the support means between the magnetic means and the responsive means and where the shielding means has a cavity in which the magnetic means is at least partially mounted such that the shielding means rotates around the magnetic means, periodically shielding and unshielding the responsive means from the magnetic flux of the magnetic means. ### Claim 10 (depends on 9) A field converter according to claim 9, wherein the shielding means has a non-superconductive element opposite the superconductive element to form a single body containing superconductive and non-superconductive portions in which the magnetic means is mounted. ### Claim 11 (depends on 9) A field converter according to claim 9, wherein there is a cooling means for maintaining the shielding means below the transition temperature of the superconductive material from which it is formed. ### Claim 12 (depends on 9) The static field converter of claim 9, where at least two responsive means are mounted on either end of the magnetic dipole. ### Claim 13 (depends on 12) The static field converter of claim 12, where each of the responsive means consists of a coil of electrically conductive, insulated wire wound in the form of a cylinder larger in diameter than the diameter of the superconductive shielding means, positioned such that when the shielding means is fully rotated into one of said responsive means, it completely surrounds the portion of the magnetic means positioned in said responsive means.