Patent Publication Number: US-2023132623-A1

Title: Power supply system for urban air mobility

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims priority to Korean Patent Application No. 10-2021-0147865, filed on Nov. 1, 2021, the entire contents of which is incorporated herein for all purposes by this reference. 
     BACKGROUND OF THE PRESENT DISCLOSURE 
     Field of the Present Disclosure 
     The present disclosure relates to a power supply system for an urban air mobility (UAM) device which can supply power to the UAM device by being connected to the UAM device during takeoff and stably return to the ground by separating a power cable from the UAM device after completion of takeoff. 
     Description of Related Art 
     Urban air mobility (UAM), a short-distance urban mobility system, is a flying means that vertically takes off from a city center, moves to a destination, and then vertically lands at the destination. 
     If a UAM device is powered by a battery without using a conventional fossil fuel, a large number of batteries needs to be loaded in the UAM device for taking off, landing, and operating for a long time, but battery capacity increase causes the weight of the UAM device to increase and thus more batteries need to be mounted for the heavy UAM device. 
     A UAM device, an electric airplane with vertical take-off and landing features that can accommodate multiple people, requires a method for increasing energy density while reducing a battery weight for efficient operation. 
     The UAM device consumes more energy during takeoff than during flight. When the UAM device includes a fuselage and a battery that supplies power to the UAM device, it has a considerable weight and requires tremendous energy to take off to an operational altitude (500 to 600 m). 
     Because the UAM device consumes a great amount of energy only to gain height in place, as described above, there is a problem that the overall flight distance is shortened. 
     Furthermore, a related art proposes a method of supplying power to an aircraft from the ground by connecting an external cable to the aircraft. However, the technology of the related art is not suitable for application to an aircraft that needs to be used for long-distance operation, such as a UAM device, because it relates to a device that continuously supplies power to an aircraft from the ground because the aircraft does not have its own energy source. 
     The information included in this Background of the present disclosure is only for enhancement of understanding of the general background of the present disclosure and may not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. 
     BRIEF SUMMARY 
     Various aspects of the present disclosure are directed to providing an external power supply system configured for supplying power by being connected to a UAM device during takeoff and stably returning the UAM device to the ground by removing a power cable from the UAM device after takeoff is completed. 
     The technical problems to be achieved in an exemplary embodiment of the present disclosure are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art to which an exemplary embodiment of the present disclosure belongs from the description below. 
     To achieve these objects and other advantages and in accordance with the purpose of the present disclosure, as embodied and broadly described herein, a power supply system for an urban air mobility (UAM) device includes a charging station provided on the ground and including a power cable for supplying power, a UAM power supply mobility device configured to be anchored at the charging station and provided with the power to charge a battery therein or to supply the power to the UAM device separated from the charging station using the power cable while flying with the UAM device, and an auxiliary mobility device configured to control a path of the power cable such that the power cable does not deviate from a preset space while flying between the charging station and the UAM power supply mobility device. 
     In another aspect of the present disclosure, a method for supplying power to a UAM device while the UAM device is separated from a charging station and takes off includes electrically connecting a UAM power supply mobility device to the UAM device, allowing the UAM power supply mobility device to take off such that the UAM power supply mobility device flies along with the UAM device separated from the charging station, supplying the power to the UAM device using a power cable mounted on the UAM power supply mobility device ascending with the UAM device until reaching a position in a preset space, and controlling a path of the power cable so that the power cable does not deviate from the preset space during flight between the charging station and the UAM power supply mobility device. 
     The methods and apparatuses of the present disclosure have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description, which together serve to explain certain principles of the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a diagram illustrating a UAM power supply system according to various exemplary embodiments of the present disclosure; 
         FIG.  2    and  FIG.  3    are diagrams illustrating the operation of the UAM power supply system according to various exemplary embodiments of the present disclosure; 
         FIG.  4    is a diagram illustrating a configuration of auxiliary vehicle according to various exemplary embodiments of the present disclosure; 
         FIG.  5    is a plan view of the auxiliary mobility device according to various exemplary embodiments of the present disclosure; 
         FIG.  6   ,  FIG.  7   ,  FIG.  8   ,  FIG.  9    and  FIG.  10    are diagrams illustrating an operation of mounting a power cable on the auxiliary mobility device according to various exemplary embodiments of the present disclosure; 
         FIG.  11 A ,  FIG.  11 B  and  FIG.  11 C  are diagrams illustrating operations of a plurality of auxiliary mobility devices according to various exemplary embodiments of the present disclosure; 
         FIG.  12    is a diagram illustrating operations of a plurality of auxiliary mobility device according to various exemplary embodiments of the present disclosure; 
         FIG.  13    is a diagram illustrating operations of a plurality of auxiliary mobility device according to various exemplary embodiments of the present disclosure; and 
         FIG.  14    is a diagram illustrating the operation of the auxiliary mobility device according to various exemplary embodiments of the present disclosure. 
     
    
    
     It may be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the present disclosure. The specific design features of the present disclosure as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particularly intended application and use environment. 
     In the figures, reference numbers refer to the same or equivalent parts of the present disclosure throughout the several figures of the drawing. 
     DETAILED DESCRIPTION 
     Reference will now be made in detail to various embodiments of the present disclosure(s), examples of which are illustrated in the accompanying drawings and described below. While the present disclosure(s) will be described in conjunction with exemplary embodiments of the present disclosure, it will be understood that the present description is not intended to limit the present disclosure(s) to those exemplary embodiments of the present disclosure. On the other hand, the present disclosure(s) is/are intended to cover not only the exemplary embodiments of the present disclosure, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the present disclosure as defined by the appended claims. 
     Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the same. However, the present disclosure may be implemented in various different forms and is not limited to the embodiments described herein. In order to clearly describe the present disclosure in the drawings, parts irrelevant to the description are omitted and similar reference numerals are attached to similar parts throughout the specification. 
     Throughout the specification, when a part “includes” a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, parts indicated by the same reference numerals throughout the specification refer to the same components. 
     In addition, a unit or a control unit included in terms such as a mobility control unit (MCU) is only a term widely used in the naming of a controller that controls a specific function of air mobility and does not imply a generic function unit. For example, each controller may include a communication device that communicates with other controllers or sensors to control the function of the controller, a memory that stores an operating system or logic commands, input/output information, and the like, and one or more processors that perform determination, operation, and decision necessary for controlling the function. 
       FIG.  1    is a diagram illustrating a UAM power supply system according to various exemplary embodiments of the present disclosure and  FIG.  2    and  FIG.  3    are diagrams illustrating an operation of the UAM power supply system according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG.  1    to  FIG.  3   , the UAM power supply system according to various exemplary embodiments of the present disclosure may include a charging station  100 , an urban air mobility (UAM) device  200 , a UAM power supply mobility device  300 , and an auxiliary mobility device  400 . 
     The charging station  100  is provided on the ground and may include a power cable  110  having a predetermined length. The power cable  110  may be used to supply power to the UAM device  200  through the UAM power supply mobility device  300  electrically connected thereto under the control of the charging station  100 . 
     Although not shown, the charging station  100  may include a communication module and a charging processor. The communication module may transmit position information or flight information to a communication module of the UAM power supply mobility device  300  and a communication module of the auxiliary mobility device  400  under the control of the charging processor. For example, the charging station  100  may unwind or wind a power cable  110  based on the position information and the flight information of the UAM power supply mobility device  300  received from the UAM power supply mobility device  300 . 
     Alternatively, the charging station  100  may control at least one auxiliary mobility device  400  so that it flies to control a path of the power cable  110  based on the position information and the flight information of the UAM power supply mobility device  300  received from the UAM power supply mobility device  300 . Detailed description thereof will be provided later. 
     The UAM device  200  may be an aircraft that can fly freely in the sky and can take off and land vertically even in a narrow space. The UAM device  200  is urban air mobility device and may be defined as an aircraft in which an individual or a large number of passengers can freely fly in the sky in the city center. The UAM device  200  may be a concept including various manned/unmanned aerial vehicles that require vertical takeoff and landing, such as drones. The UAM device  200  may be referred to as a vertical takeoff and landing multicopter. 
     The UAM device  200  may include one or more rotors because boarding/deboarding in the city center should be fast and comfortable. When at least one of the rotors provided in the UAM device  200  malfunctions, flight balance may be controlled through the remaining rotors. That is, distributed electric propulsion (DEP) for independently driving multiple rotors may be applied to the UAM device  200  for noise reduction and accident prevention. 
     DEP allows multiple rotors to be driven independently with power or electrical energy generated by a single battery. Even if an individual rotor malfunctions, other rotors are continuously driven because DEP is applied to the UAM device  200  and thus the UAM device  200  can safely fly. Furthermore, the UAM device  200  utilizes smaller rotors than a helicopter and operates only necessary rotors in accordance with flight conditions such as takeoff, landing, and flying, and thus noise generation may be minimized. 
     The UAM power supply mobility device  300  includes at least one rotor and can fly in the sky using the rotor. The UAM power supply mobility device  300  is electrically and physically connected to the power cable  110  and can supply power to the UAM device  200  which is grounded or is flying using the power cable  110 . For example, the UAM power supply mobility device  300  may be provided between the charging station  100  and the UAM device  200  mounted or anchored in the charging station  100  and supply power to the UAM device  200 . The UAM power supply mobility device  300  may be referred to as an auxiliary power drone (APD). 
     The auxiliary mobility device  400  includes at least one rotor and can fly in the sky using the rotor. At least one auxiliary mobility device  400  may fly so that it is physically connected to or separated from the power cable  110  located in a preset space. The auxiliary mobility device  400  may be referred to as an auxiliary power drone assist (APDA). A detailed description thereof will be provided later. 
     Distributed electric propulsion (DEP) for independently driving multiple rotors for noise reduction and accident prevention may also be applied to the UAM power supply mobility device  300  and auxiliary mobility device  400 . 
     Referring to  FIG.  2   , the UAM power supply mobility device  300  may be mounted on the UAM device  200  flying in a preset space and supply power to the UAM device  200  while flying with the UAM device  200 . That is, the UAM power supply mobility device  300  may be mounted on the UAM device  200  and ascend to supply power to the UAM device  200  until the UAM device  200  removed from the charging station  100  reaches a position in a preset space a in the air. 
     The charging station  100  may control the power cable  110  so that the power cable  110  continues to be unwound based on position information and flight information of the UAM power supply mobility device  300  received from the UAM power supply mobility device  300  until the UAM device  200  is removed from the charging station  100  and reaches a position in the preset space a in the air. Accordingly, the UAM power supply mobility device  300  may stably supply power to the UAM device  200 . 
     Furthermore, the charging station  100  may determine or predict a path of the power cable  110  located in a preset space based on position information and flight information of the UAM power supply mobility device  300  received from the UAM power supply mobility device  300  which is ascending. 
     Referring to  FIG.  3   , the UAM power supply mobility device  300  may be separated from the UAM device  200  and descend to be mounted on the charging station  100  when the UAM device  200  flies into a space b outside the preset space a. 
     The UAM power supply mobility device  300  may include a fixing portion that can securely fix the power cable  110  to prevent the power cable  110  from being arbitrarily detached or separated from the UAM power supply mobility device  300 . 
     Furthermore, the charging station  100  may receive position information and flight information of the UAM power supply mobility device  300  in real time from the UAM power supply mobility device  300  that has been separated from the UAM device  200  flying in the space b out of the preset space a and control the power cable  110  such that it is gradually wound based on the position information and the flight information, as shown in  FIG.  3   . 
     Furthermore, the charging station  100  may determine or predict a path of the power cable  110  located in a preset space based on position information and flight information of the UAM power supply mobility device  300  received from the UAM power supply mobility device  300  which is descending. 
     As described above, the charging station  100  may determine whether the auxiliary mobility device  400  is flying based on the determined path of the power cable  110 . For example, when the power cable  110  deviates from a preset space, the charging station  100  may cause at least one auxiliary mobility device  400  to take off and control the path of the power cable  110 . 
     Accordingly, the auxiliary mobility device  400  may prevent the power cable  110  from being separated from the preset space a during ascending flight or descending flight under the control of the charging station  100 . 
       FIG.  4    is a block diagram illustrating the configuration of the auxiliary mobility device according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG.  4   , the auxiliary mobility device  400  according to various exemplary embodiments of the present disclosure may include a body  401 , a processor  410 , a propulsion unit  420 , a battery  430 , and a communication module  350 . The present disclosure is not limited thereto, and components may be omitted or added as necessary. 
     The body  401  has a predetermined internal space and may be formed to a predetermined thickness. For example, the body  401  may be formed to have an upper surface, a lower surface, and four sides (or lateral surfaces). The present disclosure is not limited thereto and the body  401  may have any shape as long as it can securely fasten or mount a plurality of propulsion units  420 , which will be described later. 
     The body  401  may include a cable penetrating portion  402  which is provided to penetrate the body  401  in the vertical direction to allow the power cable  110  to be provided therethrough (refer to  FIG.  5   ), a cable lead-in/lead-out portion  403  for lead-in and lead-out of the power cable  110  (refer to  FIG.  5   ), and a lead-in/lead-out door  404  configured for opening or closing the cable lead-in/lead-out portion  403  (refer to  FIG.  5   ). A detailed description thereof will be provided later. 
     The propulsion unit  420  is provided on the circumferential surface of the body  401  and may operate to cause the auxiliary mobility device  400  to fly. The propulsion unit  420  may be referred to as a rotor. The propulsion unit  420  may operate by receiving electrical energy or power charged in the battery  430  under the control of the processor  410 . 
     A plurality of propulsion units  420  may be provided. For example, the propulsion unit  420  includes a first rotor  420   a  (refer to  FIG.  5   ), a second rotor  420   b  (refer to  FIG.  5   ), a third rotor  420   c  (refer to  FIG.  5   ), and a fourth rotor  420   d  (refer to  FIG.  5   ). The first rotor  420   a  (refer to  FIG.  5   ) to the fourth rotor  420   d  (refer to  FIG.  5   ) may fly the auxiliary mobility device  400  in the ascending or descending direction or in the forward, backward, left and right directions under the control of the processor  410 . 
     The processor  410  may be provided in the internal space of the body  401  to be electrically connected to a plurality of components mounted on the auxiliary mobility device  400 . That is, the processor  410  may control a plurality of hardware or software components electrically connected to the processor  410  by executing an operating system or an application program and perform processing/operations of various types of data including data related to the propulsion unit  420 . The processor  410  may be referred to as a mobility controller (MCU) or a controller. 
     The processor  410  may be configured as a single integrated circuit (IC). For example, the processor  410  may include a system on chip (SoC), a graphics processing unit (GPU), or the like. 
     The processor  410  controls the communication module  450  to execute functions of managing data links and converting communication protocols in communication between the auxiliary mobility device  400  and the charging station  100 , the UAM power supply mobility device  300 , or another auxiliary mobility device  400  connected through a network. The processor  410  may control data transmission/reception of the communication module  450 . 
     The processor  410  may load a command or data received from at least one of a non-volatile memory or other components connected thereto into a volatile memory and process the same. Furthermore, the processor  410  may store data received from or generated by at least one of the other components in the nonvolatile memory. 
     The processor  410  having the above-described functions may control the propulsion unit  420  to draw in or draw out the power cable  110 . The processor  410  may operate by receiving power from the battery  430  and control a plurality of components. 
     The communication module  450  may transmit flight information and position information of a device related to the auxiliary mobility device  400  to the charging station  100  and the UAM power supply mobility device  300  under the control of the processor  410 . The communication module  450  may receive position information of the charging station  100  from the charging station  100 . The communication module  450  may receive various types of information related to the UAM power supply mobility device  300 , including flight information of the UAM power supply mobility device  300  and position information of the UAM power supply mobility device  300 , from the UAM power supply mobility device  300 . 
     The above-described communication module  450  may include a wireless communication module or an RF module. 
     The wireless communication module may include Wi-Fi, BT, Global Positioning System (GPS) or NFC. For example, the wireless communication module may provide a wireless communication function using a radio frequency. Additionally or alternatively, the wireless communication module may include a network interface, a modem, or the like for connecting the auxiliary mobility device  400  to a network (e.g., the Internet, a LAN, a WAN, a telecommunication network, a cellular network, a satellite network, POTS,  5 G network, or the like). 
     The RF module is configured to transmit/receive data, for example, transmit/receive RF signals or called electronic signals. For example, the RF module may include a transceiver, a power amplifier module (PAM), a frequency filter, a low noise amplifier (LNA), or the like. 
     The battery  430  may store or charge power supplied from the charging station  100  under the control of the processor  410 . For example, the battery  430  may include a battery cell, which is a lithium-ion battery which is formed by putting a positive electrode, a negative electrode, a separator, and an electrolyte in a rectangular aluminum case and may be charged with and discharge electrical energy, a battery module which is a battery assembly formed by putting a bundle of a predetermined number of battery cells in a frame to protect the battery cells from external shock, heat, and vibration, and a battery pack formed by mounting various control and protection systems such as a battery management system (BMS) and a cooling system in the battery module. 
       FIG.  5    is a plan view of the auxiliary mobility device according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG.  5   , the auxiliary mobility device  400  may include the cable penetration portion  402 , the cable lead-in/lead-out portion  403 , the lead-in/leak-out door  404 , a fixing roller  405 , and the propulsion unit  420 . 
     The cable penetrating portion  402  may penetrate the body  401  in the vertical direction so that the power cable  110  is provided therethrough. The cable penetration portion  402  may have a diameter greater than that of the power cable  110 . Accordingly, the auxiliary mobility device  400  can fly in the vertical direction along the power cable  110  in a state in which the power cable  110  is accommodated into the cable penetration portion  402 . 
     The cable lead-in/lead-out portion  403  may be physically connected to the cable penetration portion  402  to allow the power cable  110  to be drawn in or out. That is, the cable lead-in/lead-out portion  403  may be a passage connecting one side of the circumferential surface of the body  401  to the cable penetration portion  402 . The cable lead-in/lead-out portion  403  may be referred to as a cable inlet. 
     The cable lead-in/lead-out portion  403  may have a width greater than the diameter of the power cable  110 . Accordingly, the power cable  110  may be provided in the cable penetration portion  402  through the cable lead-in/lead-out portion  403 . 
     The lead-in/lead-out door  404  may be formed to open or close the cable lead-in/lead-out portion  403  under the control of the processor  410 . For example, the lead-in/lead-out door  404  may be opened when the auxiliary mobility device  400  approaches the power cable  110 , and closed when the power cable  110  is accommodated into the auxiliary mobility device  400 . The lead-in/lead-out door  404  may be closed when the power cable  110  is accommodated into the auxiliary mobility device  400  to prevent the power cable  110  from being arbitrarily separated from the auxiliary mobility device  400 . 
     The lead-in/lead-out door  404  may be embedded in the auxiliary mobility device  400  in a flexible or rollable state. The present disclosure is not limited thereto, and the lead-in/lead-out door  404  may be formed in various shapes and may operate to open or close the cable lead-in/lead-out portion  403 . 
     The fixing roller  405  is provided in the cable penetration portion  402  and may fix the power cable  110  provided or accommodated into the cable penetration portion  402 . One or more fixing rollers  405  may be provided in the cable penetration portion at regular intervals  402 . When the power cable  110  is provided in the cable penetration portion  402 , the fixing rollers  405  may gradually move to the center portion of the cable penetration portion  402  to fix the power cable  110 . The fixing roller  405  may be referred to as a cable fixing roller. 
     A plurality of propulsion units  420  may be provided on the circumferential surface or the side of the body  401 . Although  FIG.  5    illustrates that the propulsion units  420  are provided at corners between neighboring sides, the present disclosure is not limited thereto. The propulsion units  420  may be referred to as propulsion devices or rotors. 
     The propulsion unit  420  may include the first rotor  420   a , the second rotor  420   b , the third rotor  420   c , and the fourth rotor  420   d.    
     The first rotor  420   a  may be provided on the left front side of the upper surface of the body  401 . The second rotor  420   b  may be provided on the right front side of the upper surface of the body  401 . The third rotor  420   c  may be provided on the right rear side of the upper surface of the body  401 . The fourth rotor  420   d  may be provided on the left rear side of the upper surface of the body  401 . 
     The first rotor  420   a  to the fourth rotor  420   d  may operate individually or together under the control of the processor  410  to allow the auxiliary mobility device  400  to fly in the ascending or descending direction or in the forward, backward, left and right directions. For example, the first to fourth rotors  420   a  to  420   d  can push the air downward to generate lift or propulsion and use the lift or propulsion to allow the auxiliary mobility device  400  to fly. 
       FIG.  6   ,  FIG.  7   ,  FIG.  8   ,  FIG.  9    and  FIG.  10    are diagrams illustrating an operation in which the power cable is accommodated in the auxiliary mobility device according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG.  6    and  FIG.  7   , the auxiliary mobility device  400  may open the lead-in/lead-out door  404  so that the power cable  110  is accommodated or loaded thereon. 
     The auxiliary mobility device  400  may control the propulsion unit  420  to access the power cable  110  and open the lead-in/lead-out door  404  so that the power cable  110  is accommodated thereinto. The lead-in/lead-out door  404  may be opened under the control of the processor  410 . 
     In the instant case, the fixing roller  405  may be in a state in which it is provided in the cable penetration portion  402 . 
     Referring to  FIG.  6    and  FIG.  8   , the auxiliary mobility device  400  may allow the power cable  110  to be accommodated in or accommodated into the cable penetration portion  402  through the cable lead-in/lead-out portion  403 . 
     Here, the lead-in/lead-out door  404  may continuously maintain an open state. Furthermore, the fixing roller  405  may also be provided in the cable penetration portion  402 . 
     Referring to  FIG.  6    and  FIG.  9   , the auxiliary mobility device  400  may close the open lead-in/lead-out door  404  when the power cable  110  is accommodated in or accommodated into the cable penetration portion  402 . In the present manner, the power cable  110  accommodated on the auxiliary mobility device  400  may be prevented from being arbitrarily separated from the auxiliary mobility device  400  by closing the lead-in/lead-out door  404 . 
     When the lead-in/lead-out door  404  is closed, the fixing roller  405  may act on the power cable  110  accommodated in the cable penetration portion  402  under the control of the processor  410 . 
     Referring to  FIG.  6    and  FIG.  10   , the auxiliary mobility device  400  may fix the power cable  110  using the fixing roller  405 . The auxiliary mobility device  400  may control the fixing roller  405  to adjust the strength or force for fixing the power cable  110 . 
     The auxiliary mobility device  400  may determine or predict a path of the power cable  110  by collecting wind information and the like provided from the UAM power supply mobility device  300  or the charging station  100  and ascend and descend based on the predicted path of the power cable  110 . Accordingly, the auxiliary mobility device  400  may control the fixing roller  405  to adjust the strength or force for fixing the power cable  110  in consideration of surrounding conditions or weather conditions in the sky. 
       FIG.  11 A ,  FIG.  11 B  and  FIG.  11 C  are diagrams illustrating operations of a plurality of auxiliary mobility devices according to various exemplary embodiments of the present disclosure. 
     As shown in  FIG.  11 A , the UAM power supply mobility device  300  according to various exemplary embodiments of the present disclosure may ascend or descend while controlling the power cable  110  so that it does not deviate from a preset space based on a location state of the UAM power supply mobility device  300 . The preset space may be a ground area where the charging station  100  is provided and an area above the charging station  100 . 
     The UAM power supply mobility device  300  may collect information on a location state or an operating state in real time and determine or predict wind information in the preset space based on the collected information. For example, the wind information may include a wind direction or a wind strength. 
     When wind blows over the charging station  100  or a platform, the power cable  110  and the UAM power supply mobility device  300  flow in the opposite direction to the wind. In the instant case, the power cable  110  and the UAM power supply mobility device  300  may collide with other facilities or interfere with a route of another UAM device in a nearby charging station  100 . 
     Accordingly, when wind blows in a first direction, the UAM power supply mobility device  300  may descend by operating the propulsion in a second direction opposite to the first direction while simultaneously operating the propulsion in the upward direction thereof. 
     On the other hand, as shown in  FIG.  11 B  and  FIG.  11 C , the charging station  100  may also allow the auxiliary mobility device  400  to fly when the power cable  110  is beyond a predetermined range although the UAM power supply mobility device  300  operates the propulsion in the opposite direction to the wind. 
     The charging station  100  may receive flight information, position information, and wind information from the UAM power supply mobility device  300  and determine whether to allow at least one auxiliary mobility device  400  to fly to control the path of the power cable  110 . 
     Here, the charging station  100  may receive weather information from an external server that can provide weather related information, such as the Meteorological Administration, analyze the information, and determine flight of at least one auxiliary mobility device  400  based on processed data. The at least one auxiliary mobility device  400  may include a first auxiliary mobility device  400   a  and a second auxiliary mobility device  400   b . 
     For example, the charging station  100  may control the first auxiliary mobility device  400   a  so that the first auxiliary mobility device  400   a  pulls the power cable  110  in the middle portion of the power cable  110  in the opposite direction to the direction in which the wind blows to prevent the power cable  110  from deviating with a predetermined distance or more when a path (route) of the power cable  110  from the charging station  100  to the UAM power supply mobility device  300  deviates by a predetermined value a max or more due to the wind. The charging station  100  may be referred to as a ground platform. 
     Furthermore, when the charging station  100  controls the power cable  110  such that it does not deviate beyond a predetermined space or a predetermined range in the charging station  100  due to wind, if it is impossible to cause the power cable to be provided within a predetermined range using the first auxiliary mobility device  400 , the charging station  100  may control the first auxiliary mobility device  400   a  and the second auxiliary mobility device  400   b  such that the power cable  110  is pulled in the middle portion of the power cable  110  using the additional second auxiliary mobility device  400   b  in the opposite direction to the direction in which the wind blows. 
     The first auxiliary mobility device  400   a  or the second auxiliary mobility device  400   b  for pulling the power cable  110  may continuously control the propulsion force and propulsion direction such that the power cable  110  does not deviate from the charging station  100  due to the wind. 
     The first auxiliary mobility device  400   a  or the second auxiliary mobility device  400   b  may move upwards from the ground to a predetermined altitude along the power cable  110  and then may be separated from the power cable  110  with a predetermined distance and fixed, and a force may be applied thereto in the opposite direction to the wind such that the power cable  110  does not deviate by a predetermined range or more. 
     Furthermore, the power cable  110  may be accommodated into the first auxiliary mobility device  400   a  or the second auxiliary mobility device  400   b  on the ground, the first auxiliary mobility device  400   a  or the second auxiliary mobility device  400   b  with the power cable  110  accommodated thereinto may move upward to a set altitude along the power cable  110 , and when the first auxiliary mobility device  400   a  or the second auxiliary mobility device  400   b  reaches the set altitude, the power cable and the first auxiliary mobility device  400   a  or the second auxiliary mobility device  400   b  may be fixed and the path of the power cable  110  may be controlled. 
       FIG.  12    is a diagram illustrating operations of a plurality of auxiliary mobility devices according to various exemplary embodiments of the present disclosure. 
     As illustrated in  FIG.  12   , when the strength of the wind varies according to altitude, the altitude of the first auxiliary mobility device  400   a  or the second auxiliary mobility device  400   b  may be changed. 
     When the first auxiliary mobility device  400   a  and the second auxiliary mobility device  400   b  are provided to control the path of the power cable, the strength of the wind may be different depending on the altitude. 
     When the first auxiliary mobility device  400   a  and the second auxiliary mobility device  400   b  provided to control the path of the power cable are uniformly provided, it may be difficult to pull the power cable beyond a set range or more using the first auxiliary mobility device  400   a  located in a place where the wind blows strongly. 
     As a result, it is necessary to provide more auxiliary mobility devices  400  at the altitude where the wind blows strongly. However, it is difficult to check the strength of the wind for each altitude in advance. 
     To solve the present problem, the first auxiliary mobility device  400   a  and the second auxiliary mobility device  400   b  may share information on the magnitude of propulsion of each of the first auxiliary mobility device  400   a  and the second auxiliary mobility device  400   b  for power cable path control and set a path such that more second auxiliary mobility devices  400   b  are located closer to the first auxiliary mobility device  400   a  having a large lateral propulsion. 
     The first auxiliary mobility device  400   a  and the second auxiliary mobility device  400   b  may include a GPS and an altimeter for flight control. 
     A large lateral propulsion action means generation of a larger propulsion for path control due to strong wind. As a result, the strength of wind may be indirectly estimated from information on the lateral propulsion. 
       FIG.  13    is a diagram illustrating operations of a plurality of auxiliary mobility devices according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG.  13   , the additional first auxiliary mobility device  400   a  or the second auxiliary mobility device  400   b  may include a battery mounted therein and may be separated from/connected to the power cable  110  as necessary. 
     The first auxiliary mobility device  400   a  or the second auxiliary mobility device  400   b  may be separated from the power cable  110  and returned to the charging station  110  as necessary. 
     Upon determining that it is difficult to control the path of the power cable  110  due to insufficient battery power during the operation of the first auxiliary mobility device  400   a  or the second auxiliary mobility device  400   b , the charging station  100  may perform control such that the first auxiliary mobility device  400   a  is separated from the power cable  110  and returned to the ground and another third auxiliary mobility device  400   c  replaces the insufficient first auxiliary mobility device  400   a.    
     The charging station  110  may readjust the altitudes of the first auxiliary mobility device  400   a  to the third auxiliary mobility device  400   c  such that the path of the power cable  110  may be selectively controlled when the first auxiliary mobility device  400   a  to the third auxiliary mobility device  400   c  are separated/additionally provided. 
     When the UAM power supply mobility device  300  gradually lowers the altitude thereof to return to the charging station  100 , the altitudes of the first auxiliary mobility device  400   a  to the third auxiliary mobility device  400   c  also decrease, and when the altitudes decrease below a predetermined value, one of the first auxiliary mobility device  400   a  to the third auxiliary mobility device  400   c  may be separated from the power cable  110  and returned to the charging station  100 . 
     Among the first auxiliary mobility device  400   a  to the third auxiliary mobility device  400   c , the auxiliary mobility device located at the lowest position may be separated from the power cable  110  first. 
     That is, among the first auxiliary mobility device  400   a  to the third auxiliary mobility device  400   c , the auxiliary mobility device including an altitude lowered below a predetermined value may be separated from the power cable  110  first and returned to the charging station  100 . 
       FIG.  14    is a diagram illustrating the operation of an auxiliary mobility device according to various exemplary embodiments of the present disclosure. 
     Referring to  FIG.  14   , the operation of the auxiliary mobility device according to various exemplary embodiments of the present disclosure is as follows. 
     First, upon determining that the auxiliary mobility device needs to be provided for power cable path control, the auxiliary mobility device may be operated. In the instant case, the auxiliary mobility device may be connected to the power cable on the ground. 
     Thereafter, the power cable lead-in/lead-out door may be opened to connect the auxiliary mobility device to the power cable (S 110 ) and the power cable may be accommodated into the center portion of the auxiliary mobility device (S 120 ). 
     Upon completion of insertion of the power cable into the center portion of the auxiliary mobility device, the power cable lead-in/lead-out door may be closed so that the power cable is not separated ( 5130 ). 
     After closing the lead-in/lead-out door, the auxiliary mobility device may move up along the power cable up to a set height for controlling the power cable (S 140 ). 
     Upon reaching the set height, the auxiliary mobility device may be fixed to the power cable (S 150 ), and the propulsion and propulsion direction of the auxiliary mobility device may be controlled so that the path of the power cable does not deviate by a predetermined range or more to control the path of the power cable (S 160 ). The auxiliary mobility device may be referred to as an auxiliary power drone assist (APDA). 
     If the UAM power supply mobility device gradually descends for landing during power cable path control, the auxiliary mobility device may also descend. At the instant time, when the altitude of the auxiliary mobility device decreases below a set value H  1  (S 170 ), fixing of the auxiliary mobility device to the power cable may be released (S 180 ), and the auxiliary mobility device may open the cable lead-in/lead-out door (S 190 ) to be separated from the cable (S 200 ). 
     Thereafter, the auxiliary mobility device may close the cable lead-in/lead-out door (S 210 ) and return to the ground (S 220 ). 
     Upon determining that it is difficult to control the path of the power cable because the SOC value of the battery of the auxiliary mobility device decreases during power cable path control (S 230 ), fixing of the auxiliary mobility device to the power cable may be released (S 180 ) and the auxiliary mobility device may return to the ground (S 220 ). 
     At the present time, when a single auxiliary mobility device is separated from the power cable, another auxiliary mobility device may be additionally provided on the ground (S 240 ) so that the path of the power cable may be smoothly controlled. 
     The path of the power cable may be effectively controlled by readjusting the altitudes of the additionally provided auxiliary mobility device and the existing auxiliary mobility device (S 250 ). 
     The present disclosure described above may be implemented as computer-readable code on a medium in which a program is recorded. A computer-readable medium includes all kinds of recording devices in which data readable by a computer system is stored. Examples of the computer-readable medium include a Hard Disk Drive (HDD), a solid state drive (SSD), a silicon disk drive (SDD), a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc. 
     Therefore, the above detailed description may not be construed as restrictive in all respects but as exemplary. The scope of the present disclosure may be determined by reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present disclosure are included in the scope of the present disclosure. 
     In the power supply system for a UAM device according to at least various exemplary embodiments of the present disclosure configured as described above, when the UAM power supply mobility device floats in the sky, the auxiliary mobility device fixes the power cable so that the power cable is not moved by the wind to prevent the power cable from deviating by a predetermined range from the charging station, improving stability. 
     Furthermore, in the power supply system for a UAM device according to at least various exemplary embodiments of the present disclosure, when the wind is strong and thus it is difficult to control the path of the power cable by the UAM power supply mobility device alone, at least one auxiliary mobility device is additionally provided to control the path of the power cable, achieving stable system operation. 
     Furthermore, the power supply system for a UAM device according to at least various exemplary embodiments of the present disclosure may use at least one auxiliary mobility device for power cable path control, and thus the number of auxiliary mobility devices to be used may be selectively set according to the strength of wind. 
     Furthermore, the terms such as “unit”, “module”, etc. included in the specification mean units for processing at least one function or operation, which may be implemented by hardware, software, or a combination thereof 
     For convenience in explanation and accurate definition in the appended claims, the terms “upper”, “lower”, “inner”, “outer”, “up”, “down”, “upwards”, “downwards”, “front”, “rear”, “back”, “inside”, “outside”, “inwardly”, “outwardly”, “interior”, “exterior”, “internal”, “external”, “forwards”, and “backwards” are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures. It will be further understood that the term “connect” or its derivatives refer both to direct and indirect connection. 
     The foregoing descriptions of predetermined exemplary embodiments of the present disclosure have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present disclosure to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to enable others skilled in the art to make and utilize various exemplary embodiments of the present disclosure, as well as various alternatives and modifications thereof. It is intended that the scope of the present disclosure be defined by the Claims appended hereto and their equivalents.