# US 9,752,558 B2 · Apparatus having a flywheel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,558 B2 - Document ID: US9752558B2 - Status: Granted - Kind: B2 - Application number: 14/946,683 - Filed: 2015-11-19 - Published: 2017-01-12 - Granted: 2017-09-05 - Earliest claimed: 2015-07-06 - Assignees: Nurielecom Co., Ltd. - Applicants: Nurielecom Co., Ltd. - Inventors: Jong Bae Lee; In Duk Kim; Jong Sun Kim - Web page: https://patentgrep.com/patent/US9752558B2 ## CPC - F03D 7/0204: {for orientation in relation to wind direction} - F03D 9/25: the apparatus being an electrical generator (F03D9/22 takes precedence) - H02K 7/02: Additional mass for increasing inertia, e.g. flywheels - H02K 7/183: {wherein the turbine is a wind turbine (adaptation of a wind turbine to an electric generator F03D9/25)} - F05B 2260/421: in the form of rotational kinetic energy, e.g. in flywheels - H02P 9/02: Details {of the control} - Y02E 10/72: Wind turbines with rotation axis in wind direction - Y02E 60/16: Mechanical energy storage, e.g. flywheels or pressurised fluids - F03D: WIND MOTORS - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A flywheel includes a shaft a rotor attached to the shaft. The rotor rotates using the shaft as a central axis. The rotor includes at least one magnet along an outer circumferential surface thereof, at least one coil spaced apart from the rotor in a radial direction. The coil may form a magnetic field that exerts a magnetic force on the magnets when current is supplied to the coil by an electric circuit, thus mitigating fluctuations in rotation of the rotor. ## Claims ### Claim 1 An apparatus, comprising: a plurality of blades coupled to a rotation center body; an electric generator configured to generate electricity when the rotation center body rotates; a flywheel including a rotor coupled to the rotation center body, and a magnet attached to an outer surface of the rotor; and a trigger coil spaced apart from the rotor in a radial direction and coupled to an electric circuit; the trigger coil configured to exert a magnetic force on the magnet when the electronic circuit supplies the trigger coil with current, wherein the magnet is one of a plurality of magnets disposed on the outer surface of the rotor, each of the plurality of magnets having an N-pole pointed radially from the rotor. ### Claim 2 (depends on 1) The apparatus of claim 1, further comprising: a housing, a rotation shaft extending from a first side of the housing; and a support physically supporting the housing, wherein the housing is configured to rotate with respect to the support. ### Claim 3 (depends on 1) The apparatus of claim 1, further comprising: the rotation center body having a sleeve shape, wherein the magnet has a magnetic moment pointed in a nonzero angle with respect to the rotation center body. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the magnet is a permanent magnet. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the magnet has a rectangular parallel piped shape. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the trigger coil includes a plurality of wound bifilar coils that are stacked and connected in series. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein each of the plurality of bifilar coils includes a spiral-shaped primary coil, and a spiral-shaped secondary coil adjacent to the primary coil, each of the primary coil and the secondary coil disposed on a common plane. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the electric circuit is configured to supply a pulse-type current to the trigger coil. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the electric circuit includes a rechargeable battery coupled to the electric generator, first and second transistors, first and second diodes, and a capacitor. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the pulse-type current has a frequency that aligns with a rotational frequency of the rotor. ### Claim 11 (depends on 2) The apparatus of claim 2, further comprising: a tail body extending from a second side of the housing, the second side being opposite to the first side; and a vertical tail wing connected to the tail body. ### Claim 12 A flywheel, comprising: a rotor coupled to a rotation center body, the rotor configured to rotate; a magnet attached to an outer surface of the rotor; a coil that is spaced apart from the rotor in a radial direction, wherein the coil part includes a trigger coil configured to form magnetic fields when current is supplied to the trigger coil; and a circuit configured to supply a current to the trigger coil when the magnet passes a center of the trigger coil, wherein the magnet is one of a plurality of magnets disposed on the outer surface of the rotor, each of the plurality of magnets having an N-pole pointed radially from the rotor. ### Claim 13 A method of rotating a rotor, comprising: generating an attractive magnetic force between a trigger coil and a magnet attached to the rotor by inducing a first current signal in a trigger coil when the magnet approaches the trigger coil; and generating a repulsive magnetic force between the trigger coil and the magnet by inducing a second current signal in the trigger coil when the magnet passes the trigger coil, wherein the magnet is one of a plurality of magnets disposed on an outer surface of the rotor, each of the plurality of magnets having an N-pole pointed radially from the rotor.