KR20170063029A - Power supply systems of the drone - Google Patents

Power supply systems of the drone Download PDF

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Publication number
KR20170063029A
KR20170063029A KR1020150168945A KR20150168945A KR20170063029A KR 20170063029 A KR20170063029 A KR 20170063029A KR 1020150168945 A KR1020150168945 A KR 1020150168945A KR 20150168945 A KR20150168945 A KR 20150168945A KR 20170063029 A KR20170063029 A KR 20170063029A
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KR
South Korea
Prior art keywords
power
phase
frequency
voltage
drones
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KR1020150168945A
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Korean (ko)
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KR101816803B1 (en
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장수영
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장수영
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Priority to KR1020150168945A priority Critical patent/KR101816803B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F3/00—Ground installations specially adapted for captive aircraft
    • B64F3/02—Ground installations specially adapted for captive aircraft with means for supplying electricity to aircraft during flight
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/04—Helicopters
    • B64C27/08—Helicopters with two or more rotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/04—Helicopters
    • B64C27/12—Rotor drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C39/00—Aircraft not otherwise provided for
    • B64C39/02—Aircraft not otherwise provided for characterised by special use
    • B64C39/024—Aircraft not otherwise provided for characterised by special use of the remote controlled vehicle type, i.e. RPV
    • 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
    • B64D35/00—Transmitting power from power plants to propellers or rotors; Arrangements of transmissions
    • B64D35/02—Transmitting power from power plants to propellers or rotors; Arrangements of transmissions specially adapted for specific power plants
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/08—Arrangements for controlling the speed or torque of a single motor
    • B64C2201/042—
    • B64C2201/066—

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Control Of Multiple Motors (AREA)

Abstract

The present invention relates to a power supply system for a drones, and more particularly, to a power supply system for a drones, which converts AC power into high frequency and high voltage power in a ground unit, supplies the power to a public dron through a wired power line, Lt; / RTI > power supply system.
A power supply system of a drones according to an embodiment of the present invention includes a ground unit installed on the ground and converting AC power into high frequency power;
A dron which receives the high-frequency power and flows into the air by rotating the BLDC motor; And
A wire unit connecting between the ground unit and the drone and transmitting the high-frequency power of the ground unit to the drones;
.

Description

[0001] Power supply systems of the drone [0002]

The present invention relates to a power supply system for a drones, and more particularly, to a power supply system for a drones, which converts AC power into high frequency and high voltage power in a ground unit, supplies the power to a public dron through a wired power line, Lt; RTI ID = 0.0 > power supply system. ≪ / RTI >

Generally, a drone is a type of flying unit flying through the sky by rotating a plurality of propellers by a motor using electric power of a battery.

At this time, in order to fly the drone, the plurality of propellers must be rotated very quickly, so that the battery consumption is very large, and accordingly, the battery must be continuously replaced.

Generally, when the disposable battery is mounted on the drones, it is possible to fly the drones only for a limited time, so disadvantages are that the disposable battery is very much consumed in order to fly the dron for a long time.

In order to solve such a battery replacement cost problem, a rechargeable battery can be used in a drones. However, it is troublesome to charge the battery periodically when using a rechargeable battery.

For example, a rotor blade dron using a general electric power uses a battery of 3.8V to 24V as a power source, but the limitation of the capacity of the battery limits the flight time to 30 minutes or less.

In order to solve such a problem, prior art Patent Registration No. 10-1350291 discloses a wired vertical take-off and landing unmanned aerial vehicle system.

This prior art patent discloses a rotor-type unmanned aerial vehicle equipped with a communication device and an observation device and operating a rotor (a motor) to swing in the air; And a ground control device that communicates with the unmanned airplane to control the flight of the unmanned airplane and to receive observation information, the system comprising: an unmanned airplane system comprising: a tether cable including the unmanned airplane and the ground control equipment power line; And supplies the necessary power from the ground control equipment through the power line to the unmanned aircraft.

In order to solve the restriction of flight time when the purpose of the flight is limited to a designated place such as a reconnaissance or a specific area shooting, a technique of electrically connecting the ground (ground control equipment) and the unmanned airplane (drone) .

However, to drive the drones' motors requires a large power of tens to hundreds of amperes (A) or more, thus requiring thicker diameter power lines.

As the height of the drones increased, the thicker power lines increased in weight as the length became longer, allowing only very low altitude flight of less than 50 ~ 100m.

In addition, most transformers including SMPS are matched to the commercial frequency and the voltage, and when the voltage drop of several hundreds w to several kw or more is required, the transformer has a heavy weight of several tens of kilograms or more.

Registration No. 10-1350291 (Registration date January 06, 2014)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a ground level unit in which AC power is converted into high frequency and high voltage power and supplied to a public dron through a wired power line, The object of the present invention is to provide a dron power supply system capable of flying a dron to a height of 500 m or more and making the transformer compact and lightweight.

According to an aspect of the present invention, there is provided a power supply system for a drones, comprising: a ground unit installed on a ground and converting AC power into high frequency power;

A dron which receives the high-frequency power and flows into the air by rotating the BLDC motor; And

A wire unit connecting between the ground unit and the drone and transmitting the high-frequency power of the ground unit to the drones;

.

Further, the wire unit includes a power wire for electrical connection between the drones and the ground unit, and a fixed wire extending together with the power wire, wherein the power wire has a power line and a ground line for transmitting power to the dron And are separately provided.

Further, the power wire is made of an aluminum material.

Also, the ground unit converts commercial AC power into high-frequency and high-voltage power and transmits it to the dron through the wire unit,

The drones are characterized in that high-frequency and high-voltage electric power is reduced in pressure and DC, and then alternately converted into electric power through an electronic control unit (ESC) and supplied to the BLDC motor.

The ground unit includes an inverter for receiving three-phase commercial alternating-current power and converting the three-phase commercial alternating-current power into high-frequency three-phase power, and a three-phase power output unit And a scot transformer for converting the three-phase power of the adjusted high frequency outputted from the slid duck into high-frequency single-phase high-voltage power and transmitting it to the drones of the public through the wire unit,

The dron includes a down-transformer for decompressing the high-frequency single-phase high-voltage high-power power and reducing the voltage to a voltage required for driving the BLDC motor, a rectifier for converting a voltage-dropped alternating voltage output from the down-transformer into a DC voltage, And converting the converted DC voltage to a high frequency three-phase so that the BLDC motor can use the converted DC voltage, and changing the number of revolutions of the BLDC motor according to the signal of the ground unit.

The ground unit includes an inverter for receiving three-phase commercial AC power and converting the three-phase commercial AC power into high-frequency three-phase power such as an electronic transmission of a drone, and a high-frequency three-phase power such as an electronic transmission output from the inverter, And a three-phase step-up transformer for converting the high-frequency three-phase high-voltage power into a high-frequency three-phase high-voltage power and transmitting the three-

The drones are provided with a three-phase down-converter that reduces the high-frequency three-phase high-voltage power such as an electronic transmission to a three-phase high-frequency voltage required for driving the BLDC motor and supplies the reduced three-phase high voltage to the BLDC motor.

The ground unit receives the three-phase commercial AC power and converts the three-phase commercial AC power into high-frequency three-phase power such as a dron electronic transmission within a voltage (hereinafter referred to as "medium voltage") that the BLDC motor can withstand. And an inverter having a slider function for transmitting and supplying the motor to the motor.

The ground unit includes an inverter for receiving three-phase commercial AC power and converting the three-phase commercial AC power into high-frequency three-phase power such as an electronic transmission of a drone, and a high-frequency three-phase power such as an electronic transmission output from the inverter, And a three-phase transformer for converting the high-frequency three-phase medium-voltage power into a high-frequency three-phase medium-voltage power and transmitting the three-phase medium-voltage power to the drone's BLDC motor through a wire unit.

Also, the BLDC motor is characterized in that a plurality of BLDC motors of the same kind are connected to rotate in opposite directions.

And the rotational force of the BLDC motor is adjusted by inverter control of the ground unit.

According to another aspect of the present invention, there is provided a power supply system for a drone, comprising: a ground unit installed on the ground and converting AC power into high frequency power;

A dron which receives the high-frequency power and flows into the air by rotating the BLDC motor; And

A wire unit connecting between the ground unit and the drone and transmitting the high-frequency power of the ground unit to the drones; ≪ / RTI >

The voltage drop of the drones is measured by the drones and fed back to the ground units, and the voltage of the high frequency electric power is adjusted in the ground units so that the reception voltage of the drones is kept constant.

According to another aspect of the present invention, there is provided a power supply system for a drone, comprising: a ground unit installed on the ground and converting AC power into high frequency power;

A dron which receives the high-frequency power and flows into the air by rotating the BLDC motor; And

A coaxial cable connecting between the ground unit and the drone and transmitting the high-frequency power of the ground unit to the drones; of

.

According to the solution of the above-mentioned problem, the ground unit converts AC power into high-frequency and high-voltage power, supplies the power to the public drones through the power line of the wired line, and decreases the voltage by using the transformer at the drones. It can fly and transformer can be small and lightweight.

1 is a schematic configuration diagram of a drone power supply system according to the present invention.
2 is a detailed block diagram showing the first embodiment of FIG.
3 is a detailed block diagram showing the second embodiment of Fig.
4 is a detailed block diagram showing the third embodiment of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

It is to be noted that the same components of the drawings are denoted by the same reference numerals and symbols as possible even if they are shown in different drawings.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Also, when a part is referred to as "including " an element, it does not exclude other elements unless specifically stated otherwise.

1 is a schematic configuration diagram of a drone power supply system according to the present invention.

1, a drone power supply system according to the present invention comprises a ground unit 10, a wire unit 20, and a drone 30, as shown in FIG.

The drones 30 are for performing various operations while flying in the air, and perform various tasks such as reconnaissance, shooting or observation.

The drone 30 is equipped with a propeller for flying a dron, a motor (BLDC motor) for driving the propeller, and various measuring devices (including sensors) for working with a dron as well as an electronic transmission (ESC).

In addition, the drones 30 are provided with decompression means, for example, to supply a power required for driving the drones by lowering high frequency and high voltage of 400 to 2000 Hz.

The largest and heavy core component of the decompression means is a coil, which has the characteristic that the size can be reduced when the frequency is high.

As described above, the high-frequency and high-voltage power is transmitted to the drones 30 by using the characteristic of the decompression means using a high frequency, for example, a large power can be transmitted even if the coil constituting the transformer is small.

In addition, the voltage drop of the dron during operation of the drones may be measured and fed back to the ground unit 10, and then the transmission voltage may be adjusted in the ground unit 10 to automatically maintain the receiving front of the drones.

The ground unit 10 is installed on the ground to maintain the position of the drones 30 and receive data observed and photographed by the drones 30 and in particular to supply power to the drones 30 .

To this end, the ground unit 10 is connected to the drones 30 by a wire unit 20.

When the ground unit 10 is provided, the ground unit 10 limits the position of the drones 30 within a predetermined range. In the case where one ground unit 10 is provided, However, it is preferable that a plurality of ground units 10 are provided to maintain a more stable position.

The ground unit 10 includes high frequency generating means to generate a high frequency and a high voltage of, for example, 400 to 2000 Hz to transmit power to the public drones 30 through the wire unit 20.

The wire unit 20 includes a power wire 24 for electrical connection between the drones 30 and the ground unit 10 and a fixed wire 21 extending together with the power wire 24 .

The power wire 24 is separately provided with two power supply lines 22 and a ground line 23 for supplying power to the drone 30.

This is for reducing the weight of the wire unit 20 by omitting the insulating member for mutual insulation required when the power line 22 and the grounding line 23 are provided in one.

Particularly, when the power wire 24 is made of aluminum, its weight can be further reduced.

The fixing wire 21 functions to prevent the drones 30 from moving away from the ground unit 10 by a predetermined distance through tensile force. In this embodiment, the fixing wire 21 is formed of a plurality of strands of high strength fiber material.

Of course, the fixing wire 21 may be made of a fiber material including glass-reinforced fiber or its PE yarn, or may further include various other materials.

In the wire unit 20, a plurality of current sensor units may be provided at predetermined intervals along the longitudinal direction of the wire unit 20 to sense a short circuit of the wire unit 20. [

At least a portion of the wire unit 20 adjacent to the ground unit 10 may be provided with a reinforcing cover for reinforcing the strength of the wire unit 20 or the thickness of the wire unit 20 may be increased, It is possible to prevent the wire unit 20 from being damaged due to collision of the wire unit 20 and the like.

In another embodiment of the present invention, the wire unit 20 may be replaced by a coaxial cable.

In case of operating in accordance with the purposes such as broadcasting relay in the populated area, safety is more important than flight altitude. Therefore, by using coaxial cable, high frequency interference is eliminated and the wire connected to the outer shield is grounded, It can be safely operated from a short circuit accident.

With this configuration, high-frequency power is generated in the high-frequency generating means of the ground unit 10, and is transmitted to the drones 30 in the air through the wire unit 20. The power supplied from the decompression means of the drones 30 So that the power required for driving the drones 30 is supplied.

2 is a detailed block diagram showing the first embodiment of FIG.

2, the ground unit 10 is provided with an inverter 11, a slider-AC 12 and a Scott transformer 13, and the dron 30 is provided with a down transformer 31 A rectifier 32, an electronic transmission 33, a BLDC motor 34, and a battery 36. [

The scot transformer 13 of the ground unit 10 and the down transformer 31 of the drones are electrically connected through the power wire 24 of the wire unit 20.

First, the inverter 11 generates and outputs a high frequency. The inverter 11 receives power of three-phase 380 V of commercial AC power, for example, 50 Hz or 60 Hz, converts it into three-phase 380 V power of high frequency (400 to 2000 Hz) .

The inverter 11 receives the AC power generated by the single phase or the mover power and converts the AC power into high frequency power.

At this time, a converter is provided in the inverter 11 to convert AC into direct current (DC) to supply power to the ground unit 10, and generate and output a high frequency from the inverter 11 to the remaining DC .

The inverter 11 has a built-in program for automatically adjusting the power and the frequency. When the voltage is detected by the drones 30 during the operation of the drone and the voltage is fed back to the ground unit 10, .

Since the voltage of the next slideways 12 varies according to the length of the power wire 24, the ground voltage (three phases) is applied to the output voltage of the down transformer 31 provided in the drone 30, (Variable) the high frequency (400 to 2000 Hz) 380 V).

That is, the slider duck 12 is a variable power source device that converts a currently inputted AC voltage into a desired magnitude and outputs a new AC voltage.

The next scot transformer 13 is a transformer that obtains a single-phase high voltage output from a three phase power supply.

The scot transformer 13 converts, for example, a 3-phase high frequency (400 to 2000 Hz) 380 V voltage into a single-phase high frequency (400 to 2000 Hz) 2000 V high voltage and outputs it.

The scot transformer 13 is a device for writing only two wires of the power wire 24.

The single-phase high-frequency high voltage output from the scot transformer 13 is transmitted to the down transformer 31 of the drones 30 via the power wire 24.

Thus, when power is transmitted using a high frequency high voltage, a thin electric power wire 24 can be used by flowing a small current to transmit electric power, thereby reducing the weight of the electric power wire 24.

For example, if the drones 30 are 12V and 60A * 6 (hexacopters), then a power wire 24 of greater than about 65 sq in power line specifications should be used, but according to the present invention, 0.5sq (square) 24) may be used.

In addition, the size and weight of the down transformer 31, which is a kind of decompression means mounted on the drone 20, can be reduced as described above.

The down transformer 31 of the drones 30 depressurizes a high-frequency power of, for example, 400 Hz to 2000 Hz and a high-voltage power of 2000V to reduce the voltage required for driving the BLDC motor 34 to a voltage of, for example, 23V.

The rectifier 32 converts the dropped AC voltage into a DC voltage in accordance with the voltage required for driving the BLDC motor 34 in the down-transformer 31.

An electronic speed controller (ESC) 33 converts this direct current voltage into high frequency three poles (three phases) for use by the BLDC motor 34 and outputs the DC voltage to the BLDC motor 34 in accordance with the signal of the ground unit 10. [ Is changed.

The BLDC motor 34 rotates while the three poles are phase-shifted by the frequency control to allow the drones 30 to fly.

The battery 30 is charged by the DC power converted and supplied from the rectifier 32 and supplies power to the electronic transmission 33 even when the power supply from the ground unit 10 is interrupted, Let it fly.

In this way, in the first embodiment, the high-frequency high-voltage electric power is transmitted, and then the electric current is converted into the direct current and the electric current is alternately converted into the high frequency three-phase through the electronic transmission 33 to rotate the BLDC motor 34.

In the first embodiment, it is possible to fly at an altitude of about 500 mm to 1 km by using 6 kW of 22.8 vx 60 A BLDC motors using a power of about 8 kW with a weight of 10 kg and a load weight of 30 kg in the first embodiment, 24) can fly to an altitude of 2 km using aluminum.

3 is a detailed block diagram showing the second embodiment of Fig.

3, the ground unit 10 is provided with an inverter 11 and a three-phase step-up transformer 15. The three-phase down-converter 37 and the BLDC motors 34a and 34b are connected to the dron 30 Respectively.

Further, the three-phase down-converting transformer 15 of the ground unit 10 and the three-phase down transformer 37 of the drones 30 are electrically connected through the power wire 24.

First, the inverter 11 is used as a kind of large capacity electronic transmission (ESC) and generates and outputs a high frequency. The inverter 11 receives power of 380 V of three-phase commercial AC power, for example, 50 Hz or 60 Hz, And converts it into high-frequency three-phase 380V power such as a transmission.

The next three-phase step-up transformer 15 converts, for example, a 3-phase high-frequency 380V voltage into a 3-phase high-frequency 2000V high voltage and outputs it.

The three-phase high frequency high voltage output from the three-phase step-up transformer 15 is transmitted to the three-phase down transformer 37 of the drones 30 via the power wire 24.

Thus, when power is transmitted using a high frequency high voltage, a thin electric power wire 24 can be used by flowing a small current to transmit electric power, thereby reducing the weight of the electric power wire 24.

Also, as described above, the size and weight of the three-phase down-converter 37, which is one type of decompression means mounted on the drone 30, can be reduced.

The three-phase down-converter 37 of the drones 30 decompresses the high voltage power of, for example, three-phase high frequency (frequency equal to that of the electronic transmission) of 2000V to generate three-phase high frequency 14 to 50V The pressure is reduced to a low level.

The BLDC motors 24a and 34b rotate by rotating the propeller while the three poles are phase-shifted by the frequency control by the low voltage of the three-phase high frequency 14 to 50V, thereby allowing the drones 30 to fly.

At this time, the BLDC motors 34a and 34b can be used by connecting a plurality of BLDC motors of the same type to rotate in opposite directions.

At this time, the rotational force of the BLDC motors 34a and 34b can be adjusted by controlling the ground inverter 11 serving as the electronic transmission of the drones.

According to the second embodiment, after the three-phase electric power of the inverter 11 is boosted to the high voltage, the three-phase electric power is directly transmitted to the drones 30, The electric power is supplied to the BLDC motors 34a and 34b immediately after the voltage is reduced to the voltage for the BLDC motors 34a and 34b without the need for a separate rectifier or an electronic transmission ESC. Can be reduced in weight.

4 is a detailed block diagram showing the third embodiment of FIG.

The third embodiment is made so as to further simplify the second embodiment so as to eliminate the three-phase down-converter 37 of the dron 30 or the three-phase step-up transformer 15 of the ground unit 10. [

As shown in FIG. 4, the ground unit 10 is provided with an inverter 11 having a built-in slideways 12 function, and the drone 30 is provided with BLDC motors 34a and 34b.

The inverter 11 in which the slider dash 12 function of the ground unit 10 is incorporated and the BLDC motors 34a and 34b of the drones 30 are electrically connected through the power wire 24. [

The inverter 11 having the built-in slip duck 12 functions as a kind of large capacity electronic transmission and generates and outputs a high frequency. The inverter 11 receives a commercial AC power, for example, three phase 380V power of 50Hz or 60Hz Converts into a three-phase high-frequency electric power such as an electronic transmission of the drones 30 within a voltage range (for example, 100 V to 380 V) (hereinafter referred to as "medium voltage") that the BLDC motor can withstand.

The three-phase high frequency middle voltage output from the inverter 11 having the built-in slicer 12 function is directly transmitted to the BLDC motors 34a and 34b of the drones 30 through the power wire 24. [

Thus, when power is transmitted using high-frequency medium voltage, a thin electric power wire 24 can be used by flowing a small current to transmit electric power, thereby reducing the weight of the electric power wire 24.

If the inverter 11 does not have the slidax 12 function, a three-phase transformer 15 may be provided instead of the three-phase step-up transformer 15 shown in FIG. 4, and a three-phase high- For example, 100V to 380V).

The BLDC motors 34a and 34b of the drone 30 are rotated by three-phase high-frequency middle voltage and three poles are rotated by frequency control to rotate the propeller so that the drone 30 can fly.

At this time, the BLDC motors 34a and 34b can be used by connecting a plurality of BLDC motors of the same type to rotate in opposite directions.

At this time, the rotational force of the BLDC motors 34a and 34n can be adjusted by controlling the inverter 11 of the ground unit 10 serving as an electronic transmission of the drone 30.

According to the third embodiment, the ultra lightweight drones 30 can fly within a range of about 100 to 500 m.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

In addition, it is a matter of course that various modifications and variations are possible without departing from the scope of the technical idea of the present invention by anyone having ordinary skill in the art.

10; Ground unit 11: inverter
12: Slidax 13: Scott transformer
15: 3 phase-boosting transformer 20: wire unit
21: fixed wire 22: power line
23: ground wire 24: power wire
30: Drones 31: Down transformer
32: rectifier 33: electronic transmission
34: BLDC motor 36: battery
37: Three phase down transformer

Claims (12)

A ground unit installed on the ground and converting AC power into high frequency power;
A dron which receives the high-frequency power and flows into the air by rotating the BLDC motor; And
A wire unit connecting between the ground unit and the drone and transmitting the high-frequency power of the ground unit to the drones;
The power supply system of the drones. The method according to claim 1,
The wire unit includes a power wire for electrical connection between the drone and the ground unit and a fixed wire extending together with the power wire, wherein the power wire is divided into a power line and a ground line for transmitting power to the dron respectively Wherein the power supply system of the drones is provided separately. The method according to claim 1,
Wherein the power wire is made of an aluminum material. The method according to claim 1,
The ground unit converts commercial AC power into high-frequency and high-voltage power and transmits it to the drones through the wire unit,
Wherein the drones convert the high-frequency and high-voltage electric power to reduced pressure and direct current, and then alternately convert the alternating current through an electronic transmission (ESC) and supply the alternating current to the BLDC motor. 5. The method of claim 4,
The ground unit includes an inverter for receiving three-phase commercial AC power and converting the three-phase commercial AC power into high-frequency three-phase power, and a slider for adjusting three-phase power of a high frequency output from the inverter to match the output voltage of the down- And a scot transformer for converting the three-phase high-frequency three-phase power output from the slid duck into high-frequency single-phase high-voltage power and transmitting the three-phase high-frequency power to the drones in the air through the wire unit,
The dron includes a down-transformer for decompressing the high-frequency single-phase high-voltage high-power power and reducing the voltage to a voltage required for driving the BLDC motor, a rectifier for converting a voltage-dropped alternating voltage output from the down-transformer into a DC voltage, And an electronic transmission that converts the converted DC voltage to a high frequency three-phase so that the BLDC motor can use the converted DC voltage and changes the number of revolutions of the BLDC motor according to the signal of the ground unit. The method according to claim 1,
The ground unit includes an inverter that receives three-phase commercial AC power and converts the three-phase commercial AC power into high-frequency three-phase power such as an electronic transmission of a drone, and a high-frequency three-phase power such as an electronic transmission output from the inverter, And a three-phase step-up transformer for converting the three-phase high voltage power into three-phase high voltage power and transmitting the three-phase high voltage power to the drones of the public through the wire unit,
Wherein the drones are provided with a three-phase down-converter for reducing the high-frequency three-phase high-voltage power such as an electronic transmission to a three-phase high-frequency voltage required for driving the BLDC motor and supplying the three- The method according to claim 1,
The ground unit receives the three-phase commercial AC power and converts it into high-frequency three-phase power such as a dron electronic transmission within a voltage (hereinafter referred to as "medium voltage") that the BLDC motor can withstand. Wherein the power supply system comprises an inverter having a built-in slicer function. The method according to claim 1,
The ground unit includes an inverter that receives three-phase commercial AC power and converts the three-phase commercial AC power into high-frequency three-phase power such as an electronic transmission of a drone, and a high-frequency three-phase power such as an electronic transmission output from the inverter, And a three-phase transformer for converting the three-phase medium-voltage power into three-phase medium-voltage power and transmitting the three-phase medium voltage power to the BLDC motor of the drone through a wire unit. 9. The method according to any one of claims 6 to 8,
Wherein the BLDC motor is used by connecting a plurality of BLDC motors of the same type so as to rotate in opposite directions. 9. The method according to any one of claims 6 to 8,
And the rotational force of the BLDC motor is adjusted by inverter control of the ground unit. A ground unit installed on the ground and converting electric power into high frequency electric power;
A dron which receives the high-frequency power and flows into the air by rotating the BLDC motor; And
A wire unit connecting between the ground unit and the drone and transmitting the high-frequency power of the ground unit to the drones; ≪ / RTI >
Wherein the voltage drop of the dron is measured at the time of operation of the dron to be fed back to the ground unit and the voltage of the high frequency electric power is adjusted in the ground unit to maintain a constant reception voltage of the dron. A ground unit installed on the ground and converting electric power into high frequency electric power;
A dron which receives the high-frequency power and flows into the air by rotating the BLDC motor; And
A coaxial cable connecting between the ground unit and the drone and transmitting the high-frequency power of the ground unit to the drones; of
Includes a drones power supply system.


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