WO2022225324A1 - 로터, 이를 이용한 프로펠러 구동장치 및 항공기 - Google Patents
로터, 이를 이용한 프로펠러 구동장치 및 항공기 Download PDFInfo
- Publication number
- WO2022225324A1 WO2022225324A1 PCT/KR2022/005647 KR2022005647W WO2022225324A1 WO 2022225324 A1 WO2022225324 A1 WO 2022225324A1 KR 2022005647 W KR2022005647 W KR 2022005647W WO 2022225324 A1 WO2022225324 A1 WO 2022225324A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- stator
- propeller
- driving device
- motor
- Prior art date
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
- B64D27/02—Aircraft characterised by the type or position of power plants
- B64D27/30—Aircraft characterised by electric power plants
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
- B64D33/08—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of power plant cooling systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
- H02K7/1823—Rotary generators structurally associated with turbines or similar engines
- H02K7/183—Rotary generators structurally associated with turbines or similar engines wherein the turbine is a wind turbine
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/223—Heat bridges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Definitions
- the present invention relates to a propeller driving device and an aircraft using the same, and more specifically, to realize internal air cooling using an air flow passage formed inside a motor, and to effectively dissipate heat by a water cooling method using a water jacket having a refrigerant circulation circuit. It relates to a rotor, a propeller driving device using the same, and an aircraft.
- a brushless electric motor typically used in an aircraft includes a stator to which a battery is connected, a rotor, and a case in which a propeller is mounted.
- an electric motor for aircraft it is characterized by having a high torque because the case itself rotates. Also, a large propeller can be turned directly without a reducer, and the electric motor can be lightened because it does not require accessories such as a reducer.
- the upper plate of the case is usually provided with a plurality of cooling holes formed by being perforated or cut in a predetermined area. Therefore, when the electric motor is driven, air is introduced into the cooling hole of the case through the air flow due to the rotation of the propeller, thereby cooling the electric motor.
- Foreign substances such as rainwater, moisture, or dust introduced in this way may act as a cause of an electrical short or fire due to a short circuit.
- Patent Document 1 Korean Patent Application Laid-Open No. 10-2017-0090037 (Patent Document 1) introduces an opening/closing control means that can open and close the cooling hole of the case formed to cool the electric motor.
- the opening/closing control means adjusts the opening degree of the cooling hole of the case according to the rotational force of the case during aircraft operation, thereby improving the cooling function of the electric motor.
- a power transmission device for an aircraft having functions of preventing moisture penetration and preventing overheating that can be effectively implemented.
- the electric motor of Patent Document 1 has a structure in which a stator (stator) is located in the center of the outer rotor method.
- a stator stator
- the front and rear surfaces of the cylindrical case serving as a rotor are provided with cooling holes through which air for air cooling is introduced and discharged.
- Patent Document 1 introduces an opening/closing control means that can open and close the cooling hole of the case formed to cool the electric motor. Discloses a technology to block the inflow into
- unmanned aerial vehicles i.e. drones
- UAVs unmanned aerial vehicles
- i.e. drones are used in logistics for delivering parcels, as well as monitoring/reconnaissance/search, quarantine/control/spreading, broadcasting/performance, environmental surveying, lifesaving, etc. is being applied in various ways.
- Patent Document 1 Motors for propeller driving devices, especially BLDC motors, which are used in two-person light airplanes or large drones carrying heavy loads, require a driving motor of several tens of kilowatts.
- the outer rotor type motor (Patent Document 1) has a limit in effectively cooling a lot of heat generated from the stator.
- Heat generated from the stator and not radiated to the outside and accumulated therein may shorten the operating life and reduce operating efficiency.
- a heat dissipating member or a heat dissipating device such as a heat sink or a heat exchanger is used together with a device that generates heat.
- a heat dissipation member manufactured using a polymer resin exhibits heat dissipation through a heat conductive filler, but a heat conductive filler with excellent heat dissipation performance has electrical conductivity as well. There is a problem that it is very inappropriate to use in an electronic device requiring insulation.
- the present inventor provides a plurality of through holes between the plurality of bridges connecting the stator, which generates more heat than the rotor, on the outside, and external air cooling through the natural side casing during flight, the upper and lower covers, and the rotor body and the rotating shaft. Formed to realize inner air cooling at the same time, and the problem of electric short due to moisture or foreign substances flowing into the motor due to inner air cooling was found to be able to prevent the occurrence of
- the present invention has been proposed to solve the problems of the prior art, and its purpose is to effectively cool the rotor and stator by external air cooling and internal air cooling using an inner rotor-outer stator type BLDC motor.
- An object of the present invention is to provide a propeller driving device and an aircraft using the same.
- Another object of the present invention is to form a plurality of through-holes in the upper and lower covers and at the same time connect them through a plurality of bridges between the rotor body and the rotating shaft to form a plurality of through-holes so that effective cooling can be achieved by inner air cooling. It is to provide a rotor, a propeller driving device using the same, and an aircraft.
- Another object of the present invention is to form a plurality of through-holes by connecting through a plurality of bridges between the rotor body and the rotating shaft, so that the rotor and the propeller using the same can be internally air-cooled together with the plurality of through-holes formed in the upper and lower covers. to provide a driving device.
- Another object of the present invention is to provide a propeller driving device capable of effectively dissipating heat in a water cooling manner by providing a water jacket having a refrigerant circulation circuit through which refrigerant circulation can be made between the outer periphery of the stator core and the casing.
- Another object of the present invention is to provide a propeller driving device using a stator excellent in heat dissipation effect by forming an insulator (or bobbin) that insulates between a stator core and a coil with an insulating heat dissipation composite material having both heat dissipation performance and insulation performance. .
- Another object of the present invention is to surround the coil wound on the insulator (or bobbin) of the stator and to insulate between the coil and the coil by insert molding with an insulating heat dissipation composite material having heat dissipation performance and insulation performance at the same time. Accordingly, an object of the present invention is to provide a propeller driving device using a stator that can solve the problem that moisture or foreign substances are introduced into the motor to cause an electric short.
- Another object of the present invention is to surround the coil wound on the first insulating heat dissipation composite material and the insulator (or bobbin) used to form an insulator (or bobbin) that insulates between the stator core and the coil, and insert an insert to insulate between the coil and the coil.
- An object of the present invention is to provide a propeller driving device using a stator that maximizes heat dissipation performance by varying the composition of the second insulating heat dissipation composite material covered by the molding method.
- a rotor for a propeller driving device includes a hollow rotating shaft; a plurality of bridges extending in a radial direction from the rotation axis; an annular rim connected to the distal end of the bridge; an annular back yoke installed on the outside of the rim to form a path of a magnetic circuit; and a plurality of magnets installed on the outside of the back yoke and configured to rotate according to the rotating magnetic field of the stator, wherein the plurality of spaces formed between the plurality of bridges form an air flow passage passing through the motor. do.
- the rotor for a propeller driving device further includes a rotor support that covers the outer surface except for the outer surface of each magnet facing the shoe portion of the stator core, wherein the rotor support covers the upper and lower portions of the magnet.
- a rotor support that covers the outer surface except for the outer surface of each magnet facing the shoe portion of the stator core, wherein the rotor support covers the upper and lower portions of the magnet.
- the rotor further includes a plurality of blades installed on the upper plate and the lower plate of the rotor support to generate a circumferential wind when the rotor rotates, and the circumferential wind collides with an air-cooling air flow passing through the motor. This can create a vortex.
- a propeller driving device includes: a housing in which an upper cover and a lower cover each having a plurality of through holes in the upper and lower portions of a cylindrical case are coupled to each other; a stator disposed inside the case; a rotor disposed to be spaced apart from the stator; and a rotation shaft connected to the rotor through a plurality of bridges, and both ends of which are rotatably supported by an upper bearing and a lower bearing positioned at the central portions of the upper cover and the lower cover. It is characterized in that the inner air cooling of the motor is made by an air flow passage passing through a plurality of spaces formed between the hole and the plurality of bridges.
- the rotor may include: a hollow rotating shaft having both ends rotatably supported by an upper bearing and a lower bearing located in the center of the upper cover and the lower cover; a plurality of bridges extending in a radial direction from the rotation axis; an annular rim connected to the distal ends of the plurality of bridges; an annular back yoke installed on the outside of the rim to form a path of a magnetic circuit; and a plurality of magnets installed outside the back yoke to rotate according to the rotating magnetic field of the stator.
- the propeller driving device further includes a plurality of blades installed on the upper and lower portions of the rotor to generate circumferential wind when the rotor is rotated, wherein the circumferential wind is air in the air flow path passing through the motor. It can collide with the flow and create a vortex.
- the propeller driving device is disposed between the cylindrical case and the stator, the water jacket having a spiral refrigerant circulation circuit in which refrigerant circulation can be made between the case; may further include.
- the propeller driving device may further include a propeller installation bracket for mounting the propeller to the rotation shaft.
- the propeller installation bracket is made in a ring shape with a central through-hole formed in the central portion, and an annular protrusion is disposed on the lower side for coupling with the rotating shaft of the motor in the central through-hole, and the upper end and the upper end of the rotating shaft are accommodated.
- the bottom surface of the protrusion to be surface-matched may be coupled in a stepped structure so as to hold the torsion during the rotation of the propeller.
- the stator includes an annular back yoke having a predetermined width to form a magnetic circuit, and a stator core having a plurality of teeth extending from the back yoke in a central direction; an insulator formed to surround an outer circumferential surface on which a coil is to be wound in each of the plurality of teeth; and a stator coil wound around the outer circumferential surface of the insulator at each of the plurality of teeth, wherein the insulator may be formed of an insulating heat dissipation composite material having both heat dissipation performance and insulating performance.
- the stator further includes a stator support having heat dissipation characteristics while enclosing the stator coil wound on the insulator and insulating between adjacent coils and coils, wherein the stator support is insert-molded with an insulating heat dissipation composite having heat dissipation performance and insulating performance. may be integrally formed.
- the insulator includes upper and lower insulators enclosing an outer circumferential surface on which a coil is to be wound by 1/2 at each of the teeth, wherein the upper and lower insulators include an annular base frame each having a predetermined width; and a plurality of tooth accommodating parts protruding from the base frame and accommodating 1/2 of the winding area of the teeth from the upper part and the lower part.
- a propeller driving device includes: a radial gap type BLDC motor of an inner rotor-outer stator structure in which a rotor is circumferentially disposed with an air gap inside a stator; and a propeller installation bracket for mounting the propeller to the rotation shaft of the motor, wherein the motor includes a stator, a rotor and a rotation shaft sequentially inside a housing in which an upper cover and a lower cover are respectively coupled to the upper and lower portions of a cylindrical case is disposed, and penetrates in the axial direction of the motor through a plurality of through holes provided in the upper cover, a plurality of spaces formed between a plurality of bridges connecting the rotary shaft and the rotor, and a plurality of through holes provided in the lower cover It is characterized in that it has an air flow passage.
- the propeller driving device may further include a water jacket disposed between the cylindrical case and the stator and having a spiral refrigerant circulation circuit in which refrigerant circulation can be made between the case and the water jacket.
- An aircraft includes a fuselage; a control box disposed at the front end of the fuselage; and a propeller driving device installed at intervals on the front surface of the control box and driving a propeller, wherein the propeller driving device includes an upper cover and a lower cover each having a plurality of through holes in the upper and lower portions of the cylindrical case, respectively.
- the propeller driving device includes an upper cover and a lower cover each having a plurality of through holes in the upper and lower portions of the cylindrical case, respectively.
- combined housing ; a stator disposed inside the case; a rotor disposed to be spaced apart from the stator; and a rotation shaft connected to the rotor through a plurality of bridges, and both ends of which are rotatably supported by an upper bearing and a lower bearing positioned at the central portions of the upper cover and the lower cover.
- the inner air cooling of the motor is made by an air flow passage passing through a plurality of spaces formed between the hole and the plurality of bridges.
- an inner rotor-outer stator type BLDC motor is used, and effective cooling can be achieved by external air cooling and internal air cooling of the rotor and stator.
- a plurality of through holes are formed in the upper and lower covers, and at the same time, a plurality of through holes are formed by connecting through a plurality of bridges between the rotor body and the rotating shaft, so that effective cooling can be achieved by inner air cooling.
- effective heat dissipation can be achieved in a water cooling manner by providing a water jacket having a refrigerant circulation circuit capable of circulating refrigerant between the outer periphery of the stator core and the casing.
- the insulator (or bobbin) that insulates between the stator core and the coil is formed of an insulating heat dissipation composite material having both heat dissipation performance and insulation performance, so that it has an excellent heat dissipation effect, thereby improving motor efficiency. Furthermore, by forming an insulator (or bobbin) with an insulating heat dissipation composite material, it is possible to provide an aviation motor with guaranteed mechanical strength such as tensile strength and flexural modulus capable of supporting external forces as well as heat dissipation performance and insulating performance.
- the stator is formed to cover all parts exposed to the outside except for the shoe part of the stator core facing the magnet of the rotor.
- a plurality of through-holes are formed by connecting through a plurality of bridges between the rotor body and the rotating shaft to provide a rotor capable of inner air cooling together with a plurality of through-holes formed in the upper and lower covers.
- the first insulating heat dissipation composite material used to form an insulator (or bobbin) that insulates between the stator core and the coil and the coil wound on the insulator (or bobbin) is surrounded by an insert molding method to insulate between the coil and the coil.
- the heat dissipation performance can be maximized by varying the composition of the second insulating heat dissipation composite to be coated.
- FIG. 1 is a perspective view showing a propeller light aircraft to which a propeller driving device according to the present invention is applied.
- FIG. 2A and 2B are a plan view showing a propeller driving device according to the present invention, respectively, and a cross-sectional view taken along line A-A of FIG. 2A.
- FIG. 3 is a partially cut-away perspective view of a propeller driving device according to the present invention.
- FIG. 4 is an exploded perspective view of a propeller driving device according to the present invention.
- FIG. 5 is an exploded perspective view of the rotor of the propeller driving device according to the present invention.
- FIG. 6 is an exploded perspective view of the stator of the propeller driving device according to the present invention.
- FIG. 7 is a graph showing the temperature for each phase U, V, and W of an embodiment in which an insulator (or bobbin) is formed of an insulating heat dissipation composite according to the present invention and a comparative example in which a heat dissipation plastic is not applied.
- the propeller driving device according to the present invention can be applied to, for example, a two-person light aircraft or a large drone carrying a heavy load.
- an inner rotor-outer stator type BLDC motor in which a stator generating a lot of heat is disposed on the outside of the rotor is employed, and it will be described as an example applied to the propeller driving of a light aircraft.
- the rotation shaft of the propeller driving device may be applied to a case in which it is disposed in a horizontal direction or a case where it is disposed in a vertical direction.
- a reducer may be coupled to the output of the motor to increase the torque.
- FIGS. 2A and 2B are a plan view showing a propeller driving device according to the present invention, respectively, and a cross-sectional view taken along line A-A of FIG. 2A.
- the propeller driving device 10 is installed at intervals in front of the control box 220 disposed at the front end of the fuselage 210 of the light aircraft 200, and the propeller at the front end of the rotating shaft. 70 is coupled to rotationally drive the propeller 70 , and the rotation shaft of the propeller driving device 10 is disposed in the horizontal direction.
- the control box 220 may include a controller for controlling various electronic devices for controlling the operation of the light aircraft 200 and a motor driving device for driving the BLDC motor 100 provided in the propeller driving device 10 . .
- FIG. 1 shows a state in which the body cover in which the air intake hole is formed on the lower side of the front end while covering the outside of the propeller driving device 10 and the control box 220 between the propeller 70 and the body 210 is omitted.
- the propeller driving device 10 is not limited to the light aircraft 200 and may be applied to a drone driving a single propeller as well as a multicopter-type drone driving a plurality of propellers, respectively.
- the propeller driving device 10 is a single rotor-single stator type motor 100 and a propeller 70 on the rotation shaft 50 of the motor 100. It may include a propeller installation bracket 20 for.
- the propeller mounting bracket 20 is largely ring-shaped, and a central through hole 21 having a large diameter is formed in the central portion. Further, a plurality of large-diameter peripheral through-holes 23 and a plurality of small-diameter peripheral through-holes 24 are arranged on the same circumference around the central through-hole 21 . The plurality of large-diameter peripheral through-holes 23 and a plurality of small-diameter peripheral through-holes 24 are arranged for weight loss to reduce weight.
- the rotating shaft 50 of the motor is sufficient to transmit the powerful rotating force of the rotor to the propeller 70 . It has a large diameter to have durability and is made in the form of a hollow part 50a in the center for weight reduction, and the outer diameter of the hollow part 50a is set to a size corresponding to the central through hole 21 of the propeller installation bracket 20 do.
- annular protrusion 25 is disposed on the lower side for coupling with the rotation shaft 50 of the motor 100 .
- a plurality of screw-fastening through-holes for fastening and fixing a plurality of fixing screws 22 to the rotating shaft 50 of the motor 100 are formed in the annular protrusion 25 .
- the upper end 50b of the rotation shaft 50 and the bottom surface of the annular protrusion 25 that receive and are surface-coupled thereto are coupled in a stepped structure.
- the step structure coupling between the upper end 50b of the rotating shaft 50 and the bottom surface of the protrusion 25 is to catch the torsion generated when the propeller 70 rotates.
- the single rotor-single stator type motor 100 includes a cylindrical case 12 , and an upper cover 16 and a lower cover 18 coupled to upper and lower portions of the cylindrical case 12 , respectively.
- the cylindrical case 12 , the upper cover 16 , and the lower cover 18 serve as a housing of the motor 100 .
- a water jacket 46 , a stator 40 , a rotor 30 , and a rotating shaft 50 are sequentially disposed inside the cylindrical case 12 to cool the motor 100 in a water-cooling manner.
- the rotating shaft 50 is rotatably supported by an upper bearing 51 and a lower bearing 52 installed in upper and lower bearing housings 16c and 18c located in the center of the upper cover 16 and the lower cover 18, respectively.
- the upper bearing 51 is used, for example, a double-row angular ball bearing capable of supporting a radial load and one large axial load at the same time
- the lower bearing 52 is a single row angular ball bearing.
- the water jacket 46 has a helical protrusion 46a formed on the outer periphery of the cylindrical body to form a helical passage, and the helical protrusion 46a is in contact with the inner surface of the cylindrical case 12 .
- a spiral passage 46b through which a refrigerant for cooling the motor 100 in a water cooling manner is circulated may be formed between the spiral protrusions 46a.
- the refrigerant may be water or aircraft cooling oil.
- O-rings 48a and 48b for sealing are respectively inserted between the upper and lower portions of the water jacket 46 with the cylindrical case 12, thereby preventing leakage of the spiral passage 46b.
- a plurality of through-holes 16e and 18e serving as air-cooling air flow passages are formed in the upper cover 16 and the lower cover 18 .
- the upper cover 16 and the lower cover 18 have a space between the upper and lower bearing housings 16c and 18c, which are located inside and serve as a hub, and the outer rings 16a and 18a disposed on the outside.
- a plurality of bridges (16d, 16d; 18d) extends radially. Accordingly, a plurality of through holes 16e and 18e are formed between the upper and lower bearing housings 16c and 18c, the intermediate rings 16b and 18b, the outer rings 16a and 18a and the plurality of bridges 16d and 18d. has been
- the intermediate rings 16b and 18b may be omitted or added as necessary for strength reinforcement, and a network for forming a plurality of through holes 16e and 18e formed in the upper cover 16 and the lower cover 18 .
- the structure may be changed differently.
- the plurality of through-holes 16e and 18e introduces relatively low-temperature external air into the motor 100 from the outside, and then heat-exchanges with the heat generated from the stator 40, followed by air-cooling air discharged to the outside of the motor. form a flow path.
- the motor 100 has an inner rotor structure in which the rotor 30 is disposed inside the stator 40 .
- the motor 100 constitutes a radial gap type electric motor in which the rotor 30 is concentrically disposed inside the stator 40 .
- a plurality of bridges 34 extend radially from a hollow rotation shaft 50 disposed in the central portion, and distal ends of the plurality of bridges 34 . is connected to the annular rim (rim) (33).
- annular hub 35 is reinforced for strength reinforcement in the connection portion between the plurality of bridges 34 and the rotation shaft 50 .
- the rotating shaft 50 and the annular rim 33 connected through the plurality of bridges 34 are integrally formed, and a metal material capable of providing strength while being lightweight, for example, an aluminum alloy or duralumin, etc. can be made with
- a back yoke 31 serving as a magnetic circuit is coupled to the outer periphery of the annular rim 33 in a sliding manner.
- a plurality of engaging grooves 33a are formed on the outer periphery of the rim 33
- a plurality of engaging projections 31b coupled to the plurality of engaging grooves 33a protrude on the inner periphery of the back yoke 31 .
- the back yoke 31 may be made of an electrical steel sheet (silicon steel sheet) to form a magnetic circuit together with a plurality of magnets 32 attached to the outer surface, and a plurality of magnets 32 attached to the outer surface. of the coupling protrusion 31a protrudes.
- the plurality of coupling protrusions 31a of the back yoke 31 support while receiving the magnet 32 between two adjacent coupling protrusions 31a in a sliding coupling manner.
- the shape of the magnet 32 is formed in a trapezoidal shape, and the space formed between the two coupling protrusions 31a has a longer inner width so that the trapezoidal magnet 32 is coupled.
- the plurality of magnets 32 are made of permanent magnets, and a plurality of N-pole and S-pole magnets are alternately arranged.
- the rotor support 36 is coupled thereto.
- the rotor support 36 is disposed between the annular upper plate 36a and the lower plate 36b covering the upper and lower portions of the magnet 32, and the magnet 32 and the magnet 32, while both ends of the upper plate 36a ) and a plurality of connecting portions 36c connected to the lower plate 36b. Accordingly, the rotor support 36 covers the outer surface except for the outer surface of each magnet 32 facing the shoe portion of the stator core.
- a plurality of blades 37a and 37b protrude from the upper plate 36a and the lower plate 36b to cool the stator 40 by generating wind when the rotor 30 rotates, respectively.
- the shape of the plurality of blades 37a and 37b may be a linear shape, a round shape, or the like.
- the wind generated by the plurality of blades 37a and 37b according to the rotation of the rotor 30 follows the circumferential direction, and the circumferential wind blows through the plurality of through holes 16e of the upper cover 16, the plurality of A vortex is generated by colliding with an air-cooling air stream passing through a plurality of spaces 33c formed between the bridges 34 and a plurality of through-holes 18e formed in the lower cover 18 .
- the vortex generated in this way reaches the inner corners of the motor 100 so that heat exchange with the stator 40 that generates the greatest heat can be effectively performed.
- the upper plate 36a and the lower plate 36b are provided with protrusions having a plurality of through holes 36d formed therein for coupling with the back yoke 31, and a plurality of coupling holes ( 33b) is formed so that it can be fastened with a set screw or the like.
- the rotor 30 is connected between the rotation shaft 50 and an annular rim 33 through a plurality of bridges 34 .
- the plurality of spaces 33c formed between the plurality of bridges 34 move from the outside of the motor to the inside through the plurality of through holes 16e and 18e provided in the upper cover 16 and the lower cover 18 .
- the introduced relatively low temperature outside air forms a flow path for the air discharged to the outside of the motor.
- the stator 40 has an annular back yoke 41a having a predetermined width to form a magnetic circuit and a plurality of teeth 41b from the back yoke 41a, as shown in FIGS. 2A to 4 and 6 . ) of the stator core 41 extending radially inward, and the insulator (or bobbin) 42a and 42b of an insulating material integrally formed to surround the outer circumferential surface around which each coil of the teeth 41b is to be wound, and the A stator coil 43 wound around the outer peripheral surface of the insulators 42a and 42b of each of the plurality of teeth 41b is included.
- Each of the plurality of teeth 41b is formed in a "T" shape, and a coil 43 is wound between a shoe portion opposite to the magnet 32 of the rotor 30 and an annular back yoke 41a. It has a winding area.
- the insulators (or bobbins) 42a and 42b are pre-fabricated as upper and lower insulators 42a and 42b, and then assembled to the stator core 41 or integrally formed by insert molding with insulating plastic (resin). can
- the upper and lower insulators 42a and 42b are provided on an annular base frame 420 each having a predetermined width, with the exception of a shoe portion facing the magnet 32 of the rotor 30 and teeth 41b. ), a plurality of tooth accommodating portions 422 accommodating the winding region by 1/2 at the upper and lower portions protrude at intervals.
- the upper and lower insulators 42a and 42b may be preferably formed of an insulating heat dissipation composite material having both heat dissipation performance and insulation performance.
- insulation performance of at least 10Kv or more so as to be safe from lightning strikes, and thermal conductivity is preferably 3W/mK or more in consideration of heat dissipation characteristics.
- the insulating heat dissipation composite material used in the present invention has a continuous use temperature of 150 ° C. or higher, and an insulating heat dissipation filler composed of a polymer matrix acting as a binder, a ceramic added and dispersed to improve thermal conductivity, and strength reinforcement. It contains added reinforcing fibers.
- the polymer matrix is polyamide, polyester, polyketone, liquid crystal polymer, polyolefin, polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyphenylene oxide (PPO), polyether sulfone (PES), poly It may include one kind of compound selected from the group consisting of etherimide (PEI) and polyimide, or a mixture or copolymer of two or more kinds.
- PPS polyphenylene sulfide
- PEEK polyether ether ketone
- PPO polyphenylene oxide
- PES polyether sulfone
- poly It may include one kind of compound selected from the group consisting of etherimide (PEI) and polyimide, or a mixture or copolymer of two or more kinds.
- the polymer matrix preferably has a continuous use temperature of 150° C. or higher, and for example, polyphenylene sulfide (PPS) may be used.
- PPS polyphenylene sulfide
- the insulating heat dissipation filler may be provided in an amount of 75 to 100 parts by weight based on 100 parts by weight of the polymer matrix.
- the insulating heat dissipation filler is selected from the group consisting of magnesium oxide, talc, titanium dioxide, aluminum nitride, silicon nitride, boron nitride, aluminum oxide, silica, zinc oxide, barium titanate, strontium titanate, beryllium oxide, silicon carbide and manganese oxide. It may include one or more species.
- the insulating heat dissipation filler may have an average particle diameter of 10 nm to 600 ⁇ m.
- the reinforcing fiber may be provided in an amount of about 30 parts by weight based on 100 parts by weight of the polymer matrix, for example, glass fiber or the like may be used.
- the insulating composite may further include at least one additive selected from the group consisting of a dispersant, an antioxidant, a work improving agent, a coupling agent, a stabilizer, a flame retardant, a pigment, and an impact modifier.
- the inner rotor-outer stator type BLDC motor 100 applied to the propeller driving device 10 of the present invention includes a single rotor 30 and a single stator 40 .
- a three-phase (U, V, W) coil 43 is wound on the teeth 41b of the stator core 41, and the three-phase (U, V, W) It is connected through a cable 45 to apply a driving signal to the coil 43 .
- FIG. 7 is a graph showing the temperature for each phase U, V, and W of an embodiment in which an insulator (or bobbin) is formed of an insulating heat dissipation composite according to the present invention and a comparative example in which a heat dissipation plastic is not applied.
- an insulator or bobbin
- an insulating heat dissipation composite material By forming an insulator (or bobbin) with an insulating heat dissipation composite material, it is possible to provide an aviation motor in which mechanical strength such as tensile strength and flexural modulus capable of supporting external forces as well as heat dissipation performance and insulating performance is guaranteed.
- an insulating heat dissipation composite material having both heat dissipation performance and insulation performance to insulate the adjacent coil and coil while surrounding the coil 43 wound on the insulator (or bobbin) 42a, 42b of the stator 40. It includes an insert-molded stator support 44 for heat dissipation.
- stator support 44 which is insert-molded with the insulating heat dissipation composite, includes all parts exposed to the outside except for the shoe part of the stator core 41 facing the magnet 32 of the rotor 30. formed to cover.
- the radially outer surface of the heat dissipation stator support 44 is in contact with the water jacket 46 . Therefore, when heat is generated from the coil 43 of the stator 40, the heat is conducted to the stator support 44 for heat dissipation, and then heat exchange is made with the water jacket 46 which is cooled by a water cooling method. Heat dissipation can be achieved.
- the inner rotor-outer stator type BLDC motor 100 is used to effectively cool the rotor 30 and the stator 40 by external air cooling and internal air cooling. can be done
- a plurality of cooling through-holes 16e and 18e are formed in the upper and lower covers 16 and 18, and an annular rim 33 and a rotating shaft supporting the body of the rotor at the same time
- an air flow passage passing through the inside of the motor is formed by forming a plurality of spaces 33c between the plurality of bridges 34 .
- the internal air cooling of the motor may be performed by the flow of air discharged to the outside of the motor.
- effective heat dissipation can be achieved in a water cooling manner by providing a water jacket 46 having a refrigerant circulation circuit through which refrigerant circulation can be made between the outer periphery of the stator core 41 and the casing 12 .
- the insulator (or bobbin) 42a, 42b that insulates between the stator core 41 and the coil 43 is formed of an insulating heat dissipation composite material having both heat dissipation performance and insulation performance, so that there is an excellent heat dissipation effect. Motor efficiency can be improved.
- the insulator (or bobbin) 42a, 42b with an insulating heat dissipation composite material it is possible to provide an aviation motor with guaranteed mechanical strength such as tensile strength and flexural modulus that can support external forces as well as heat dissipation and insulation performance. can
- an insulating heat dissipation composite material having both heat dissipation performance and insulation performance to insulate the adjacent coils and coils while surrounding the coil 43 wound on the insulator (or bobbin) 42a, 42b of the stator for insert molding and heat dissipation
- a stator support body 44 is provided.
- the heat dissipation stator support 44 covers all parts exposed to the outside except for the shoe part of the stator core 41 facing the magnet 32 of the rotor 30 . That is, waterproof molding is performed except for the magnet 32 of the rotor and the shoe portion of the stator core 41 that forms the magnetic circuit path.
- the present invention exemplifies that the propeller driving device rotates and drives the propeller of the light aircraft, but a single propeller driving device is installed in the drone body or a plurality of propeller driving devices are installed on a plurality of arms extending from the drone body It can be applied to installed multicopter type drones.
- the rotational shaft of the motor exemplifies rotation of the propeller of the light aircraft exposed to the outside, but it can be changed to a drone having a fan structure in which a propeller or a blade is built in a cylindrical casing.
- the present invention provides a variety of logistics fields, monitoring/reconnaissance/search, quarantine/control/spreading, broadcasting/performance, environmental surveying, structure, etc., in which a distribution box for delivering parcels is detachably provided on the lower part of the drone body. It can be changed in various ways for the purpose.
- the present invention uses a single rotor-single stator type large BLDC motor of several tens of kilowatts to realize inner air cooling using an air flow passage formed inside the motor, and effectively dissipate heat in a water cooling method using a water jacket having a refrigerant circulation circuit.
- This relates to a propeller driving device that can be made, and can be applied to a light aircraft or a drone.
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Abstract
Description
Claims (15)
- 중공형 회전축;상기 회전축으로부터 방사방향으로 연장된 복수의 브릿지;상기 브릿지의 선단부에 연결된 환형 림;상기 림의 외측에 설치되어 자기회로의 경로를 형성하는 환형 백요크; 및상기 백요크의 외측에 설치되어 스테이터의 회전자기장에 따라 회전이 이루어지는 복수의 마그넷;을 포함하며,상기 복수의 브릿지 사이에 형성된 복수의 공간은 모터를 관통하는 공기흐름통로를 형성하는 프로펠러 구동장치용 로터.
- 제1항에 있어서,스테이터 코어의 슈 부분과 대향하는 각 마그넷의 외표면을 제외하고 외측면을 커버는 로터지지체를 더 포함하며,상기 로터지지체는상기 마그넷의 상부와 하부를 커버하는 환형의 상부판과 하부판; 및상기 마그넷과 마그넷 사이에 배치되면서 양단부가 상부판과 하부판에 연결되는 복수의 연결부;를 포함하는 프로펠러 구동장치용 로터.
- 제2항에 있어서,상기 로터지지체의 상부판과 하부판에 설치되어 로터의 회전시에 원주 방향 바람을 발생시키는 복수의 블레이드를 더 포함하며,상기 원주 방향 바람은 모터를 관통하는 공냉용 공기흐름과 충돌하여 와류를 발생시키는 프로펠러 구동장치용 로터.
- 원통형 케이스의 상부와 하부에 각각 복수의 관통구멍을 갖는 상부 커버와 하부 커버가 각각 결합된 하우징;상기 케이스의 내측에 배치된 스테이터;상기 스테이터와 간격을 두고 배치된 로터; 및상기 로터와 복수의 브릿지를 통하여 연결되고, 양단부가 상부 커버와 하부 커버의 중앙부에 위치한 상부 베어링과 하부 베어링에 회전 가능하게 지지되는 회전축;을 포함하며,상기 상부 커버와 하부 커버의 복수의 관통구멍과 상기 복수의 브릿지 사이에 형성된 복수의 공간을 통과하는 공기흐름통로에 의해 모터의 내측 공냉이 이루어지는 프로펠러 구동장치.
- 제4항에 있어서,상기 로터는양단부가 상부 커버와 하부 커버의 중앙부에 위치한 상부 베어링과 하부 베어링에 회전 가능하게 지지되는 중공형 회전축;상기 회전축으로부터 방사방향으로 연장된 복수의 브릿지;상기 복수의 브릿지의 선단부에 연결된 환형 림;상기 림의 외측에 설치되어 자기회로의 경로를 형성하는 환형 백요크; 및상기 백요크의 외측에 설치되어 스테이터의 회전자기장에 따라 회전이 이루어지는 복수의 마그넷;을 포함하는 프로펠러 구동장치.
- 제4항에 있어서,상기 로터의 상부와 하부에 설치되어 로터의 회전시에 원주 방향 바람을 발생시키는 복수의 블레이드를 더 포함하며,상기 원주 방향 바람은 모터를 관통하는 공기흐름통로의 공기흐름과 충돌하여 와류를 발생시키는 프로펠러 구동장치.
- 제4항에 있어서,상기 원통형 케이스와 스테이터 사이에 배치되며 케이스와의 사이에 냉매 순환이 이루어질 수 있는 나선형의 냉매순환회로를 갖는 워터 자켓;을 더 포함하는 프로펠러 구동장치.
- 제4항에 있어서,상기 회전축에 프로펠러를 장착하기 위한 프로펠러 설치 브라켓;을 더 포함하는 프로펠러 구동장치.
- 제8항에 있어서,상기 프로펠러 설치 브라켓은 중앙부에 중앙관통구멍이 형성된 링 형상으로 이루어지고, 상기 중앙관통구멍에는 모터의 회전축과 결합을 위해 환형의 돌기부가 하측에 배치되어 있으며,상기 회전축의 상단부와 상기 상단부를 수용하여 면접합되는 상기 돌기부의 저면은 상기 프로렐러의 회전시에 비틀림을 잡아주도록 단차 구조로 결합이 이루어지는 프로펠러 구동장치.
- 제4항에 있어서,상기 스테이터는자기회로를 형성하도록 소정의 폭을 갖는 환형의 백요크와 상기 백요크로부터 복수의 티스가 중심방향으로 뻗어 있는 스테이터 코어;상기 복수의 티스 각각에서 코일이 권선될 외주면을 감싸도록 형성되는 인슐레이터; 및상기 복수의 티스 각각에서 인슐레이터의 외주면에 권선되는 스테이터 코일;을 포함하며,상기 인슐레이터는 방열성능 및 절연성능을 동시에 갖는 절연성 방열복합재로 형성되는 프로펠러 구동장치.
- 제10항에 있어서,상기 인슐레이터에 권선된 스테이터 코일을 둘러싸면서 인접한 코일과 코일 사이를 절연하면서 방열 특성을 갖는 스테이터 지지체를 더 포함하며,상기 스테이터 지지체는 방열성능 및 절연성능을 갖는 절연성 방열복합재로 인서트 몰딩하여 일체로 형성되는 프로펠러 구동장치.
- 제10항에 있어서,상기 인슐레이터는 티스 각각에서 코일이 권선될 외주면을 1/2씩 감싸는 상부 및 하부 인슐레이터를 포함하며,상기 상부 및 하부 인슐레이터는 각각소정 폭으로 이루어진 환형의 베이스 프레임; 및상기 베이스 프레임으로부터 돌출되어 티스의 권선영역을 상부와 하부에서 1/2씩 수용하는 복수의 티스수용부;를 포함하는 프로펠러 구동장치.
- 스테이터의 내측에 로터가 에어갭을 두고 원주상으로 배치된 인너 로터-아우터 스테이터 구조의 레이디얼 갭 타입(Radial gap type)의 BLDC 모터; 및상기 모터의 회전축에 프로펠러를 장착하기 위한 프로펠러 설치 브라켓;을 포함하며,상기 모터는 원통형 케이스의 상부와 하부에 상부 커버와 하부 커버가 각각 결합된 하우징의 내측에 스테이터, 로터 및 회전축이 순차적으로 배치되어 있으며,상기 상부 커버에 구비된 복수의 관통구멍, 회전축과 로터 사이를 연결하는 복수의 브릿지 사이에 형성된 복수의 공간 및 하부 커버에 구비된 복수의 관통구멍을 경유하여 모터의 축방향으로 관통하는 공기흐름통로를 갖는 프로펠러 구동장치.
- 제13항에 있어서,상기 원통형 케이스와 스테이터 사이에 배치되며 케이스와의 사이에 냉매 순환이 이루어질 수 있는 나선형의 냉매순환회로를 갖는 워터 자켓;을 더 포함하는 프로펠러 구동장치.
- 동체;상기 동체의 선단부에 배치된 콘트롤 박스; 및상기 콘트롤 박스의 전면에 간격을 두고 설치되며 프로펠러를 구동하는 프로펠러 구동장치;를 포함하며,상기 프로펠러 구동장치는원통형 케이스의 상부와 하부에 각각 복수의 관통구멍을 갖는 상부 커버와 하부 커버가 각각 결합된 하우징;상기 케이스의 내측에 배치된 스테이터;상기 스테이터와 간격을 두고 배치된 로터; 및상기 로터와 복수의 브릿지를 통하여 연결되고, 양단부가 상부 커버와 하부 커버의 중앙부에 위치한 상부 베어링과 하부 베어링에 회전 가능하게 지지되는 회전축;을 포함하며,상기 상부 커버와 하부 커버의 복수의 관통구멍과 상기 복수의 브릿지 사이에 형성된 복수의 공간을 통과하는 공기흐름통로에 의해 모터의 내측 공냉이 이루어지는 항공기.
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EP22792024.6A EP4329154A1 (en) | 2021-04-23 | 2022-04-20 | Rotor, and propeller driving device and aircraft using same |
US18/286,662 US20240204617A1 (en) | 2021-04-23 | 2022-04-20 | Rotor, and propeller driving device and aircraft using the same |
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CN116760235A (zh) * | 2023-06-28 | 2023-09-15 | 京马电机有限公司 | 一种台式烟机用温控防护外转子电机及防护方法 |
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- 2022-04-20 US US18/286,662 patent/US20240204617A1/en active Pending
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