# US 5,350,958 A · Superconducting rotating machine, a superconducting coil, and a superconducting generator for use in a lighting equipment using solar energy

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- Number: US 5,350,958 A
- Document ID: US5350958A
- Status: Granted
- Kind: A
- Application number: 07/975,445
- Filed: 1992-01-17
- Granted: 1994-09-27
- Earliest claimed: 1991-01-17
- Inventors: Yoshihiro Ohnishi
- Web page: https://patentgrep.com/patent/US5350958A

## CPC

- H02K 55/00: Dynamo-electric machines having windings operating at cryogenic temperatures
- H02K 53/00: Alleged dynamo-electric perpetua mobilia
- H02S 99/00: Subject matter not provided for in other groups of this subclass
- Y02E 10/46: Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
- Y02E 10/50: Photovoltaic [PV] energy
- Y02E 40/60: Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
- Y10S 505/876: Electrical generator or motor structure
- Y10S 505/877: Rotary dynamoelectric type
- Y10S 505/878: with cooling
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- H02S: GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES (obtaining electrical energy from radioactive sources G21H1/12; light sensitive inorganic semiconductor devices H10F; light sensitive organic semiconductor devices H10K30/00; thermoelectric devices H10N10/00; pyroelectric devices H10N15/00)
- 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 superconducting rotating machine comprises a cylindrical frame, a stator installed integrally around an inner periphery of the cylindrical frame and a rotor arranged concentrically and rotatably within the stator in a juxtaposed spaced relationship to the inner surfaces of the stator and with a cylindrical clearance between the inner periphery of the stator and the outer periphery of the rotor. The stator coil includes a primary coil having extra fine Cu filaments and a secondary coil having extra fine filaments made of a superconducting alloy containing Cu, Nb.sub.3 Sn, V.sub.3 Ga, V.sub.3 Ge, Bi, Ca, CuO and Sr. The secondary coil is covered with an insulating layer. Even if a conventional rotatable cryogenic container is not provided, a strong anomalous pseudo-Josephson effect can be obtained. A superconducting generator for use in lighting equipment is also disclosed.

## Claims

### Claim 1

A superconducting rotating apparatus, comprising:
a cylindrical frame having an inner peripheral surface;
a cylindrical stator disposed in said cylindrical frame around said inner peripheral surface thereof, said cylindrical stator comprising a plurality of permanent magnet rings, wherein each said permanent magnet ring comprises three arcuate permanent magnets that have outer arcuate surfaces with a radius approximately equal to a radius of said inner peripheral surface of said cylindrical frame, and wherein said three arcuate permanent magnets have said outer arcuate surfaces thereof engaging said inner peripheral surface of said cylindrical frame, and a pair of end covers at opposite ends of said cylindrical stator;
said cylindrical stator having an inner surface;
a stator coil disposed around said inner surface of said cylindrical stator, said stator coil comprising a primary coil and a secondary coil, said primary coil comprising extra fine Cu filaments and said secondary coil comprising extra fine filaments of superconducting alloy containing Cu, Nb.sub.3 Sn, V.sub.3 Ga, V.sub.3 Ge, Bi, Ca, CuO, and Sr, said secondary coil being covered with a Cu layer, and said Cu layer being covered with an insulating layer;
a rotor disposed concentrically and rotatably inside said cylindrical stator, said rotor having a cylindrical clearance around an outer periphery thereof spacing said rotor from said stator coil, and said rotor comprising a non-magnetic shaft, a cylindrical non-magnetic holder integral with and disposed around said non-magnetic shaft, a plurality of permanent magnet rings disposed around said non-magnetic shaft, wherein each said permanent magnet ring of said rotor comprises a pair of arcuate permanent magnets, and a pair of non-magnetic end disks at opposite ends of said rotor;
a pair of non-magnetic disk end covers on opposite ends of said cylindrical frame, each said disk end cover comprising a bearing supporting an end of said non-magnetic shaft of said rotor; and
an auxiliary motor connected with one said end of said non-magnetic shaft of said rotor.

### Claim 2 (depends on 1)

The superconducting rotating apparatus of claim 1, wherein said pairs of arcuate permanent magnets of said rotor are disposed circumferentially and axially around said cylindrical non-magnetic holder, each said arcuate permanent magnet of said rotor having a predetermined length and width with a radial delay of an angle between 15 and 30 degrees in the axial direction.

### Claim 3 (depends on 2)

The superconducting rotating apparatus of claim 2, wherein said end covers and said non-magnetic disk end covers have small openings therein, and said primary and secondary coils have leads penetrating said small openings.

### Claim 4 (depends on 1)

The superconducting rotating apparatus of claim 1, wherein said end covers and said non-magnetic disk end covers have small openings therein, and said primary and secondary coils have leads penetrating said small openings.

### Claim 5

An apparatus, comprising:
a superconducting rotating apparatus, comprising
a cylindrical frame having an inner peripheral surface,
a cylindrical stator disposed in said cylindrical frame around said inner peripheral surface thereof, said cylindrical stator comprising a plurality of permanent magnet rings, wherein each said permanent magnet ring comprises three arcuate permanent magnets that have outer arcuate surfaces with a radius approximately equal to a radius of said inner peripheral surface of said cylindrical frame, and wherein said three arcuate permanent magnets have said outer arcuate surfaces thereof engaging said inner peripheral surface of said cylindrical frame, and a pair of end covers at opposite ends of said cylindrical stator,
said cylindrical stator having an inner surface,
a stator coil disposed around said inner surface of said cylindrical stator, said stator coil comprising a primary coil and a secondary coil, said primary coil comprising extra fine fine Cu filaments and said secondary coil comprising extra filaments of superconducting alloy containing Cu, Nb.sub.3 Sn, V.sub.3 Ga, V.sub.3 Ge, Bi, Ca, CuO, and Sr, said secondary coil being covered with a Cu layer, and said Cu layer being covered with an insulating layer,
a rotor disposed concentrically and rotatably inside said cylindrical stator, said rotor having a cylindrical clearance around an outer periphery thereof spacing said rotor from said stator coil, and said rotor comprising a non-magnetic shaft, a cylindrical non-magnetic holder integral with and disposed around said non-magnetic shaft, a plurality of permanent magnet rings disposed around said non-magnetic shaft, wherein each said permanent magnet ring of said rotor comprises a pair of arcuate permanent magnets, and a pair of non-magnetic end disks at opposite ends of said rotor,
a pair of non-magnetic disk end covers on opposite ends of said cylindrical frame, each said disk end cover comprising a bearing supporting an end of said non-magnetic shaft of said rotor, and
an auxiliary motor connected with one said end of said non-magnetic shaft of said rotor;
a solar array having a desired angular position relative to the sun;
an anti-overcharge circuit connected to said solar array;
a storage battery connected to said anti-overcharge circuit;
an anti-overdischarge circuit connected to said anti-overcharge circuit, said anti-overdischarge circuit having an anti-overdischarge meter and an anti-chattering circuit connected therewith;
a control unit connected to said anti-overdischarge circuit, said control unit having an automatic-manual transfer switch and an external tumbler switch;
a sunset illuminance detecting circuit connected to said control unit;
a timer connected to said sunset illuminance detecting circuit;
a D/A inverter connected to said control unit; and
lighting equipment connected to said D/A inverter;
wherein said superconducting rotating apparatus is connected to and between said control unit and said D/A inverter.