# US 2018/0320696 A1 · Air cooling apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0320696 A1 - Document ID: US20180320696A1 - Status: Published application - Kind: A1 - Application number: 15/773,259 - Filed: 2016-11-04 - Published: 2018-11-08 - Earliest claimed: 2015-11-09 - Inventors: Seungjoo Han; Byungho Han; Jongtaek Han - Web page: https://patentgrep.com/patent/US20180320696A1 ## CPC - F04D 25/026: {with a magnetic coupling} - F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence) - F04D 25/08: the working fluid being air, e.g. for ventilation - F04D 29/056: Bearings - F04D 29/58: Cooling (of machines or engines in general F01P); Heating; Diminishing heat transfer {(for the motor of air-pump units F04D25/082; cooling of shafts or bearings F04D29/04)} - H02K 1/27: Rotor cores with permanent magnets - H02K 5/163: {radially supporting the rotary shaft at only one end of the rotor (H02K5/165, H02K5/167, H02K5/173 take precedence)} - H02K 7/116: with gears - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - H02K 7/1823: {structurally associated with turbines or similar engines} - H02K 9/06: with fans or impellers driven by the machine shaft - H02K 49/108: {with an axial air gap} - H02K 5/20: with channels or ducts for flow of cooling medium - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract Air cooling devices driven rotational power of electric motors to expand air to thereby produce and supply cooling air. An air cooling device includes a power transmission device for increasing a rotational driving force of an expander that is disposed between the expander housing and an electric motor and for separating the expander from the electric motor. The power transmission device generates rotational magnetic field by receiving rotational power from the electric motor or receiving rotational power from the electric motor and external electric power. The rotating magnetic field generates a rotational force by interacting with magnetic field, based on attraction and repulsion forces. The air cooling device increases rotation speed and force when it transmits the power. The air cooling device increases a flow rate, and expands air adiabatically, thereby supplying cold air with high air density. ## Claims ### Claim 1 An air cooling apparatus comprising: an electric motor; an expander rotating by rotation power of the electric motor to expand air; an expander housing surrounding the expander; and a power transmission device interposed between the electric motor and the expander housing to increase rotational driving of the expander, wherein the power transmission device comprises a power generator driven by a magnetic field and a front driver module and a rear driver module disposed at the front and rear sides of the power generator to form a magnetic field around a front rotor and a rear rotor of the power generator, the power generator being mounted with the expander on a shaft of a bearing module, being mounted with the rear driver module and the expander housing spaced apart from the rear rotor by a predetermined gap in an axial direction of a frame and disposed in a direction orthogonal to the rear rotor at the rear side of the frame, the front side of the frame being mounted on the electric motor, and the front driver module being spaced from the front rotor by a predetermined gap in the axial direction of the frame and disposed in a direction orthogonal to the front rotor at the front side of the frame and being mounted on a shaft of the electric motor to receive rotation power of the electric motor, and the front rotor and the rear rotor of the power generator face the front driver module and the rear driver module, permanent magnets of the front rotor and the rear rotor having magnetic fluxes thereof facing the axial direction of the shaft, the permanent magnets of the front driver module and the rear driver module having magnetic fluxes thereof facing the axial diameter direction of the shaft such that a rotating magnetic field generated by rotation of the front driver module, a rotating magnetic field generated by the power generator and a magnetic field of the rear driver module form a rotational force with the interaction of an attractive force and a repulsive force to increase the revolution per minute and the rotational force and transfer power. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the power generator comprises: a frame; the bearing module mounted on the frame and supporting the rotation; the front rotor and the rear rotor disposed in a direction orthogonal to the front and rear faces of the frame, spaced from the front and rear faces in an axial direction by a predetermined gap, fixed to the shaft of the bearing module, allowing the permanent magnets to be arranged in an axial diameter direction while being spaced by a predetermined gap in an axial direction of the shaft and disposed in an orthogonal direction such that the direction of the magnetic flux faces the axial direction of the shaft; driver modules spaced from the front rotor and the rear rotor by a predetermined gap in an axial direction of the shaft and disposed in an orthogonal direction such that permanent magnets are arranged around the front rotor and the rear rotor in an axial diameter direction and the direction of the magnetic flux faces the axial diameter direction of the shaft, and mounted onto the frame; lock nuts for fixing the front rotor and the rear rotor to the bearing module; and a fixture for fixing the bearing module to the frame. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the frame has 2n (n is an integer of 4 or more) or 3n (n is an integer of 2 or more) permanent magnet-embedded holes formed in inner surfaces of the front and rear side in the circumferential axial direction around the front rotor and the rear rotor at a uniform interval based on a reference point centering on the axis of the body formed into a cylindrical shape, has a mounting space and a cooling space of the bearing module formed of any one of a grease lubrication type bearing, an oil lubrication type bearing, an air cooling type bearing and a magnetic bearing formed in the inner circumferential surface of the frame, and has mounting surfaces of the electric motor, the expander housing and the rear driver module formed at the front surface and the rear surface of the body thereof. ### Claim 4 (depends on 2) The apparatus of claim 2, wherein the bearing module comprises: a shaft having a bearing mounting surface, a bearing fixing step, and fixing grooves and threads for fixing the phases of the front and rear rotors formed on a circumferential surface of a body having a round rod shape; any one of a grease lubrication type bearing, an oil lubrication type bearing, an air cooling type bearing and a magnetic bearing; and a fixture for fixing the phases of the front rotor and the rear rotor. ### Claim 5 (depends on 2) The apparatus of claim 2, wherein the front rotor and the rear rotor comprises: a rotating plate comprising a cylindrical protrusion formed at the center of a body having a disc shape, having a slot groove formed in the inner circumferential surface to fix the phase, and having 2n (hereinafter, n is an integer of 2 or more) permanent magnet-embedded holes formed on a circumferential axis line of the body at a uniform interval in accordance with the slot groove; and 2n permanent magnets whose N poles and S poles are alternately embedded in the permanent magnet-embedded holes in accordance with the slot groove of the rotating plate such that the direction of the magnetic fluxes of 2n permanent magnets faces the axial direction of the shaft. ### Claim 6 (depends on 2) The apparatus of claim 2, wherein the driver module comprises 2n (n is an integer of 4 or more) permanent magnets whose N poles and S poles are alternately embedded in the permanent magnet-embedded holes of the frame in accordance with the reference point of the frame or 3n (n is an integer of 2 or more) permanent magnets arranged in three-phase such that the direction of the magnetic fluxes of permanent magnets faces the axial diameter direction of the shaft. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the front driver module comprises: a fixing body having a shaft through hole and a mounting surface of the electric motor formed at the center of a cylindrical body with one side thereof closed and having 2n (n is an integer of 4 or more) or 3n (n is an integer of 2 or more) permanent magnet-embedded holes formed in the circumferential axial direction around the front rotor at a uniform interval in accordance with a reference point; and 2n permanent magnets whose N poles and S poles are alternately embedded in the permanent magnet-embedded holes in accordance with the reference point of the fixing body or 3n permanent magnets arranged in three-phase such that the direction of the magnetic fluxes of 2n or 3n permanent magnets faces the axial diameter direction of the shaft. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the rear driver module comprises: a fixing body having a mounting surface with the expander housing and the power generator and a through hole formed at a cylindrical body with one side thereof closed and having 2n (n is an integer of 4 or more) or 3n (n is an integer of 2 or more) permanent magnet-embedded holes formed in the circumferential axial direction around the rear rotor at a uniform interval in accordance with a reference point; and 2n permanent magnets whose N poles and S poles are alternately embedded in the permanent magnet-embedded holes in accordance with the reference point of the fixing body or 3n permanent magnets arranged in three-phase such that the direction of magnetic fluxes of 2n or 3n permanent magnets faces the axial diameter direction of the shaft. ### Claim 9 (depends on 2) The apparatus of claim 2, wherein in the power transmission device, the permanent magnets of the front rotor and the rear rotor of the power generator are arranged such that the direction of the magnetic flux faces the axial diameter direction of the shaft and the magnetic fluxes of the permanent magnets of the driver modules, the front driver module and the rear driver module of the power generator face the axial direction of the shaft. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the power transmission device comprises a rear driver module comprising stators of coil assembly wound with a coil forming a magnetic flux in a direction orthogonal to the magnetic flux direction of the permanent magnets of the rear rotor to receive rotation power and external power of the electric motor, and the front rotor and the rear rotor of the power generator face the front driver module and the rear driver module, the permanent magnets of the front rotor and the rear rotor having magnetic fluxes facing the axial direction of the shaft, the permanent magnets of the front driver module and the stators of the rear driver module having magnetic fluxes facing the axial diameter direction of the shaft such that the rotating magnetic field generated by rotation of the front driver module, the rotating magnetic field generated by the power generator and the magnetic field of the rear driver module form a rotational force with the interaction of an attractive force and a repulsive force to increase the revolution per minute and the rotational force and transfer power. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the rear driver module comprises: a fixing body having a mounting surface with the expander housing and the power generator and a through hole formed at a cylindrical body with one side thereof closed and having 2n (n is an integer of 4 or more) or 3n (n is an integer of 2 or more) stator-embedded holes formed in the circumferential axial direction and the circumferential axial diameter direction around the rear rotor at a uniform interval in accordance with a reference point; and a stator of a coil assembly wound around a coil former whose N poles and S poles are alternately embedded in 2n stator-embedded holes in accordance with the reference point of the fixing body or embedded in 3n stator-embedded holes in three-phase such that the direction of magnetic fluxes of 2n or 3n stators faces the axial diameter direction of the shaft. ### Claim 12 (depends on 10) The apparatus of claim 10, wherein in the power transmission device, the permanent magnets of the front rotor and the rear rotor of the power generator are arranged such that the direction of the magnetic flux faces the axial diameter direction of the shaft and the magnetic fluxes of the stators of the driver modules, the front driver module and the rear driver module of the power generator face the axial direction of the shaft. ### Claim 13 (depends on 1) The apparatus of claim 1, wherein the power transmission device comprises a rear driver module comprising armatures of coil assembly wound with a coil forming a magnetic flux in the same direction as the magnetic flux direction of the permanent magnets of the rear rotor on the same circumferential axial line to receive rotation power of the electric motor, and the front rotor of the power generator faces the front driver module, the permanent magnets of the front rotor and the rear rotor having magnetic fluxes facing the axial direction of the shaft, the permanent magnets of the front driver module having magnetic fluxes facing the axial diameter direction of the shaft such that the rotating magnetic field generated by rotation of the front driver module and the rotating magnetic field generated by the power generator form a rotational force with the interaction of an attractive force and a repulsive force to increase the revolution per minute and the rotational force and the rear rotor transfers power of the rotating magnetic field to the rear driver module to intermit the magnetic flux and produce power. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the rear driver module comprises: a fixing body having a mounting surface with the expander housing and the power generator and a through hole formed at a cylindrical body with one side thereof closed and having 3n (n is an integer of 2 or more) armature-embedded holes formed on the same circumferential axial line as the permanent magnet-embedded holes of the rear rotor at a uniform interval in accordance with a reference point; and an armature of a coil assembly wound around a coil former and embedded in 3n armature-embedded holes in three-phase in accordance with the reference point of the fixing body such that the direction of 3n magnetic fluxes faces the axial direction of the shaft.