WO2022220579A1

WO2022220579A1 - Propeller driving device and drone using same

Info

Publication number: WO2022220579A1
Application number: PCT/KR2022/005348
Authority: WO
Inventors: 김병수
Original assignee: 주식회사 아모텍
Priority date: 2021-04-14
Filing date: 2022-04-13
Publication date: 2022-10-20

Abstract

The present invention relates to a propeller driving device capable of simultaneously performing rotational driving of a load and power generation by using a double stator-single or double rotor type of motor, and a drone using same. The propeller driving apparatus according to the present invention comprises: a double stator-single or double rotor type of motor; and a motor seating part for seating the motor on an arm of the drone, wherein the motor is of a radial gap type, in which an inner rotor and an outer rotor are disposed circumferentially on the inner side and outer side of the double stator, respectively, with an air gap therebetween, and one of the inner stator of the double stator formed on the inner side thereof and the outer stator thereof formed on the outer side is set as a power generator, and the other one is set as a driving motor.

Description

Propeller driving device and drone using the same

The present invention relates to a propeller driving device and a drone using the same, and more particularly, to a propeller driving device capable of simultaneously performing rotational driving and power generation of a load using a double stator-single rotor or double rotor type motor and using the same It's about drones.

A general drone basically includes a plurality of fans for outputting lift and a battery for supplying power to the fans. The fan includes a motor that generates rotational force by electric power applied from a battery while being fixed to the main body, and a propeller fixed to a drive shaft of the motor.

However, one of the common problems with drones is that the motor consumes a lot of power, so the flight time is short. For example, even if the battery is fully charged, the power is low, so there are many restrictions on the flight distance. Therefore, in the related art, the drone may be lost by being discharged while returning to the ground or falling into a river.

In the case of a drone motor, a motor composed of a single stator-single rotor is used, so to generate power and charge the battery, two motors are used, one is used as a driving motor and the other is a motor for power generation (that is, generators) are being used to increase the dwell time of drones in the air.

In this way, when the driving motor and the power generation motor have a separate structure, a belt or other structure is required to connect the driving motor and the power generation motor. There are many space restrictions.

In the case of automobiles, the motor for power generation (starting motor) and other driving motors are separately configured, so space restrictions and various connection devices are required.

In Korea Patent Publication No. 10-2172335 (Patent Document 1), it is installed under the fan of the drone and operates by receiving the flow pressure of air coming down to the lower part of the propeller during flight to generate power and send it to the charger to extend the flight time. Disclosed is a drone equipped with a fan device having a power generation unit that enables

Patent Document 1 has a structure in which a fan having a motor for driving a propeller and a power generation unit having a generator are separately separated. A wind tunnel is required to guide the flow pressure of air generated by the propeller to the rotor, and There is a space constraint due to the separate installation of the generator.

Accordingly, the present invention has been proposed to solve the problems of the prior art, and its object is a propeller driving device capable of simultaneously performing rotational driving and power generation of a load using a double stator-single rotor or double rotor type motor. and to provide a drone using the same.

Another object of the present invention is to use a double stator-single-rotor or double-rotor type motor to simultaneously perform rotational driving and power generation of a load, and thus a propeller driving device capable of increasing flight time even with a compact size and using the same to provide drones.

In order to achieve the above object, a propeller driving apparatus according to an embodiment of the present invention includes a double stator-double rotor type motor; and a motor seating part for seating the motor on the arm of the drone, wherein the motor is a radial gap type ( Radial gap type), and the double stator includes an inner stator formed on the inner side of the annular back yoke and an outer stator formed on the outer side, one of the inner stator and the outer stator is set as a generator, and the other is driven It is characterized in that it is set by a motor.

The double stator includes: a stator core having a plurality of inner and outer teeth radially extending inside and outside the annular back yoke having a predetermined width to form a magnetic circuit; an insulator made of an insulating material that surrounds an outer circumferential surface on which each of the plurality of inner teeth and the outer teeth is to be wound; and an inner and outer stator coil wound on an outer circumferential surface of the insulator, respectively, of the plurality of inner and outer teeth, wherein the annular back yoke includes a plurality of stator coils for fixing the double stator to the motor seat using a fixing bolt. It may have a through hole.

In addition, the inner rotor has a magnet disposed on the outside of the cylindrical first back yoke disposed between the inner side of the double stator and the bearing housing, and the outer rotor has a cylindrical shape disposed with a preset air gap with the outside of the double stator. A magnet is disposed inside the second back yoke of the first back yoke and one end of the second back yoke is connected to each other, and a rotation shaft may be connected to a central portion thereof.

Furthermore, the motor seating portion includes a circular cup-shaped casing; a bearing housing extending upwardly from the inner center of the casing and having upper and lower bearings installed therein; and a plurality of bolt fastening protrusions to which a plurality of fixing bolts are fastened for fixing and installing the stator to the bottom of the casing at a distance from the bearing housing on the bottom of the casing.

In the motor, the inner rotor and the inner stator may be set as one of the generator and the driving motor, and the outer rotor and the outer stator may be set as the other of the generator and the driving motor.

A propeller driving apparatus according to another embodiment of the present invention includes a double stator-double rotor type motor; and a motor seating part for seating the motor on the arm of the drone, wherein the motor includes: a double rotor in which a plurality of N-pole and S-pole magnets are alternately disposed on the inside and outside of the annular back yoke; a rotating shaft connected to the center of the annular back yoke; and an inner stator and an outer stator disposed with an air gap inside and outside the double rotor, respectively, wherein any one of the inner stator and the outer stator is set as a generator, and the other is set as a driving motor characterized.

In this case, the motor seating portion is a circular cup-shaped casing; and a bearing housing extending upward in the longitudinal direction at the inner center of the casing and having upper and lower bearings installed inside the housing.

A propeller driving device according to another embodiment of the present invention is made of a circular cup shape, extending from the bottom to the top in a cylindrical shape in the center of the inner motor casing integrally provided with a bearing housing having upper and lower bearings installed therein; an inner stator supported on the outer periphery of the bearing housing; an outer stator supported inside the motor casing; a rotor disposed between the inner stator and the outer stator; and a rotating shaft rotatably supported by the upper and lower bearings, one end of the rotor is connected, and a propeller connected to the front end thereof, wherein any one of the inner stator and the outer stator is set as a generator, and the other is a driving motor characterized in that it is set to .

The rotor disposed between the inner stator and the outer stator may form a radial gap type double stator-single rotor type motor.

In addition, the rotor is configured using an isotropic magnet simultaneously magnetized on both sides without a back yoke, the inner surface of the isotropic magnet forms an inner stator and a driving motor or generator, and the outer surface of the magnet is a generator or a generator together with an outer stator A drive motor may be formed.

A propeller driving device according to another embodiment of the present invention comprises: a rotor in which a plurality of N poles and S poles are alternately arranged on the inside and outside, respectively, by simultaneously magnetizing both sides of an isotropic magnet; a rotating shaft connected to one side of the rotor; and an inner stator and an outer stator disposed with an air gap on the inside and outside of the rotor, respectively, wherein any one of the inner stator and the outer stator is set as a generator, and the other is set as a driving motor do it with

The propeller driving device is made of a circular cup shape, the motor casing integrally provided with a bearing housing extending from the bottom to the top in a cylindrical shape in the inner center; a bearing housing extending from the bottom to the top along the longitudinal direction in a cylindrical shape at the inner center of the motor casing; and upper and lower bearings disposed at intervals inside the bearing housing and rotatably supporting the rotating shaft, wherein the rotating shaft is connected to one end of the magnet of the rotor, and the propeller is connected to the front end of the rotating shaft have.

A drone according to an embodiment of the present invention includes: a drone body having at least a battery, a wireless communication unit, and a control device inside the casing; and at least one propeller driving device installed on the drone main body or a plurality of arms extending from the outer periphery of the drone main body to drive the propeller.

As described above, in the present invention, a double stator-single rotor or a double rotor type motor may be used to simultaneously drive and generate power of a load.

As a result, in the present invention, by using a double stator-single rotor or double rotor type motor, rotational driving and power generation of the load can be simultaneously performed, so that flight time can be increased even with a compact size. In the present invention, since the drive motor and the motor for power generation (ie, the generator) have an integrated structure, a belt or other structure is not required to connect the drive motor and the motor for power generation.

In addition, in the present invention, a double stator-double rotor is provided, the inner rotor and the inner stator may be used as a driving motor, and the outer rotor and the outer stator may be used as a generator.

In this case, the outer rotor and the outer stator used for the generator generate power, and when the power generation capacity exceeds the reference value, it is converted to a driving motor, thereby increasing the efficiency and torque of the motor as a whole. To this end, a switching circuit for converting a power generation circuit connected to the outer stator into a motor driving circuit may be provided in the control unit.

In addition, in the present invention, a double stator-single rotor type motor in which a single rotor is disposed between the inner stator and the outer stator is used, and the single rotor uses an isotropic magnet with simultaneous magnetization on both sides, so that the resistance of the magnet without a separate back yoke is used. The side side constitutes the inner stator and the drive motor, and the outer side of the magnet can be used as a generator together with the outer stator.

In general, instead of an anisotropic magnet that can maximize efficiency by increasing the Gauss value of the magnet surface only when there is a back yoke on the opposite side of the used side, in the present invention, a separate back yoke is used by using an isotropic magnet simultaneously magnetized on both sides. Use both sides of the magnet without

In the present invention, if the outer stator having a relatively larger diameter than the inner stator is allocated for the generator, the number of poles (P) of the armature coil can be increased, so that the frequency of power generated per rotation of the rotor can be increased. In the case of the same rpm, allocating the outer stator for the generator may increase the frequency of the generated power than allocating the inner stator for the generator. In general, by increasing the number of poles of the generator, the rotational speed of the rotor can be reduced. Therefore, by increasing the number of poles of the generator even at a low rotational speed, the frequency of power can be increased.

Furthermore, in the present invention using a double stator-single rotor type motor, the inner surface of the magnet constitutes the inner stator and the generator, and the outer surface of the magnet can be used as a driving motor together with the outer stator.

1 is a perspective view illustrating a multicopter type drone to which a double stator-single rotor or double rotor type motor according to the present invention is applied.

2 is an axial cross-sectional view showing a propeller driving device according to a first embodiment of the present invention.

3 is a radial cross-sectional view of the double stator-double rotor type motor employed in the propeller driving apparatus according to the first embodiment of the present invention.

4 is an axial cross-sectional view showing a propeller driving device according to a second embodiment of the present invention.

5 is a radial cross-sectional view of a double stator-double rotor type motor employed in a propeller driving apparatus according to a second embodiment of the present invention.

6 is an axial cross-sectional view showing a propeller driving device according to a third embodiment of the present invention.

7 is a radial cross-sectional view of the double stator-single rotor type motor employed in the propeller driving apparatus according to the third embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described with reference to the accompanying drawings.

In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. Definitions of these terms should be made based on the content throughout this specification.

In general, a double-stator-double-rotor type motor is being applied to various fields according to the shape of the rotor output. A double rotor is driven by one motor driving circuit and connected to one rotating shaft to drive one load, or two loads are respectively connected to two rotating shafts arranged in a concentric circle and individually controlled by individual motor driving circuits. can also be driven.

In addition, in the double stator-double rotor, the double stator is implemented using an integral stator core and the double rotor is concentrically separated from each other, or the double stator is implemented using a separate stator core and the double rotor has the same back yoke It can be implemented inside and outside of

In the present invention, a double rotor is connected to one rotating shaft to drive one propeller load, one stator is driven by one motor driving circuit, and the other stator selectively serves one of power generation and driving. Switching control can be achieved. As a result, in the present invention, it is possible to simultaneously drive and generate power by using a double stator-double rotor type motor.

Furthermore, in the present invention, a double stator-single rotor type motor in which a single rotor is disposed between an inner stator and an outer stator is used, and the single rotor uses an isotropic magnet with simultaneous magnetization on both sides, so that the resistance of the magnet without a separate back yoke is used. The side side constitutes the inner stator and the drive motor or generator, and the outer surface of the magnet can be used as a generator or drive motor together with the outer stator.

1 to 3, the double stator-double rotor type motor according to the first embodiment of the present invention is applied to a multicopter-type drone capable of attaching and detaching a distribution box for delivering parcels as shown in FIG. can

The double-stator-double-rotor type motor according to the first embodiment of the present invention may be applied to a drone driving a single propeller as well as a multicopter-type drone driving a plurality of propellers, respectively.

The multicopter-type drone shown in FIG. 1 is disposed in the central portion of the drone main body 20 having a battery, a motor driving circuit, a rectifier circuit, a wireless communication unit, a control device, etc. inside the casing, and from the outer periphery of the drone main body 20. Four extended arms (22a-22d), four propeller driving devices (10a-10d) installed at the tips of the four arms (22a-22d) to drive four propellers (70a-70d), the drone body A pair of

drone legs

24a and 24b installed in the lower part of the 20 to seat the drone 200 on the ground and a logistics box for delivering a parcel delivery article detachably coupled to the lower part of the drone body 20 (26) is included.

The propeller driving device 10 according to the first embodiment of the present invention includes a double stator-double rotor type motor 100 and a motor seating part for seating the motor 100 on the arms 22a-22d of the drone ( 12).

The motor seating part 12 has a circular cup shape, and serves as a motor casing as well as seating the motor 100 on the arms 22a-22d of the drone.

The motor seat 12 is a circular cup-shaped casing 12a, a bearing housing extending upward along the longitudinal direction at the inner center of the casing 12a and having upper and

lower bearings

52 and 54 installed therein ( 14) and a plurality of bolt fastening projections to which a plurality of fixing bolts 68 for fixing and installing the stator 60 to the bottom of the casing 12a are fastened at a distance from the bearing housing 14 on the bottom of the casing 12a (16) is included.

In the double stator-double rotor type motor 100 according to the first embodiment, an inner rotor 30 and an outer rotor 40 are disposed inside and outside the double stator 60 as shown in FIG. 3 . have a structured

The motor 100 constitutes a radial gap type electric motor in which an inner rotor 30 and an outer rotor 40 are circumferentially disposed inside and outside the double stator 60 .

The inner rotor 30 has a plurality of N-pole and S-pole magnets 34 on the outside of the cylindrical first back yoke 32 disposed between the inner side of the double stator 60 and the bearing housing 14 alternately. It may be arranged or composed of a cylindrical magnet in which a plurality of N-pole and S-pole magnetic poles are alternately divided and magnetized.

In addition, the outer rotor 40 has a plurality of N-pole and S-pole magnets 44 on the inside of the cylindrical second back yoke 42 arranged with a preset air gap with the outside of the double stator 60 alternately. It may be arranged as or may be composed of a cylindrical magnet in which a plurality of N-pole and S-pole magnetic poles are alternately divided and magnetized.

In this case, one end of the first back yoke 32 of the inner rotor 30 and the second back yoke 42 of the outer rotor 40 are connected to each other, and the upper and lower bearings ( A rotating shaft 50 rotatably supported to 52 and 54 is connected.

As a result, the rotation output of the inner rotor 30 and the outer rotor 40 is output to the outside through a single rotation shaft 50 , and rotates the propeller 70 coupled to the rotation shaft 50 .

In addition, the first back yoke 32 and the second back yoke 42 may be formed of an electrical steel sheet (silicon steel sheet) to form a path for forming a magnetic circuit while serving as a casing of the motor 100 .

Preferably, the second back yoke 42 has the same diameter as the casing 12a of the motor seat 12 so as to serve as a casing of the motor 100 .

The double stator 60 is a stator core having a plurality of inner teeth 62b and an outer tooth 62c radially extending inside and outside an annular back yoke 62a having a predetermined width to form a magnetic circuit, respectively. (62), an insulator (or bobbin) 64 of an insulating material integrally formed so as to surround the outer circumferential surface on which each coil of the plurality of inner teeth 62b and the outer teeth 62c is to be wound, and the plurality of inner teeth Each of the teeth 62b and the outer teeth 62c includes inner and

outer stator coils

66a and 66b wound around the outer peripheral surface of the insulator 64 .

In addition, a plurality of through holes 69 are formed in the annular back yoke 62a of the stator core 62, and a plurality of bolt fastening protrusions 16 are passed through the plurality of fixing bolts 68 through the through holes 69. ), the double stator 60 can be fixed to the motor seat 12 .

The plurality of inner teeth 62b and outer teeth 62c are each formed in a “T” shape, and a shoe portion facing the magnets of the inner rotor 30 and the outer rotor 40 and an annular back yoke ( 62a) has a winding region between which the coil is wound.

In the double stator 60, an inner stator coil 66a is wound around the plurality of inner teeth 62b to form an inner stator 60a, and an outer stator coil 66b is formed on the plurality of outer teeth 62c. It is wound to form the outer stator 60b.

Therefore, in the double stator-double rotor type motor 100 according to the first embodiment of the present invention, the inner rotor 30 and the inner stator 60a are used as a driving motor, and the outer rotor 40 and the outer The stator 60b may be used as a generator.

In general, by increasing the number of poles of the generator, the rotational speed of the rotor can be reduced. That is, if the number of poles (P) of the armature coil is increased, the frequency of power generated per rotation is increased. For this reason, it is preferable to allocate the outer stator 60b having a relatively larger diameter than the inner stator 60a for the generator.

In addition, the number of poles P of the outer stator 60b allocated for the generator for the above reason is set larger than the inner stator 60a, and correspondingly, the number of magnetic poles of the outer rotor 40 is also the magnetic poles of the inner rotor 30 It can be set to be larger than the number.

That is, the number of inner teeth 62b and outer teeth 62c of the double stator 60 is set differently as shown in FIG. 3 or the number of outer teeth 62c is greater than the number of inner teeth 62b. can be set.

The motor 100 employed in the propeller driving device 10 of the present invention has a double stator-double rotor structure, and the inner rotor 30 is rotated by the rotating magnetic field generated by the inner stator 60a. A three-phase AC voltage may be obtained from the outer stator coil 66b wound around the outer teeth 62c of the outer stator 60b by using the rotation of the outer rotor 40 integrally with the rotor 30 .

Therefore, when the three-phase AC voltage is rectified into direct current (DC) by a rectifying circuit, it can be stored and used in the battery built into the drone body 20 .

As described above, in the first embodiment of the present invention, by using the double stator-double rotor type motor 100, rotational driving and power generation of the load can be simultaneously performed, thereby increasing the flight time.

In addition, since the motor 100 of the present invention has an integrated structure in which a double stator 60 is disposed with a gap between the inner rotor 40 and the outer rotor 50, it can be implemented in a compact size, and a drone built-in battery Smaller capacity can be adopted.

Moreover, in the present invention, since the driving motor and the generator have an integrated structure, a belt or other structure is not required to connect the driving motor and the generator.

In addition, in the present invention, the inner rotor 30 of the double rotor is connected to one rotating shaft 50 to drive one propeller load by the rotating magnetic field of the inner stator 60a, and the outer stator 60b is generated and driven Switching control may be made to selectively serve one of the two.

That is, the outer rotor 40 and the outer stator 60b used for the generator generate power, and when the preset power generation capacity exceeds the reference value, it is converted to a driving motor, thereby increasing the efficiency and torque of the motor as a whole. . To this end, a switching circuit for converting a power generation circuit connected to the outer stator 60b into a motor driving circuit may be provided in the control unit.

4 is an axial cross-sectional view showing a propeller driving device according to a second embodiment of the present invention, and FIG. 5 is a double stator employed in the propeller driving device according to the second embodiment of the present invention - a diameter in a double rotor type motor directional cross-section.

4 and 5 , the propeller driving device 10 according to the second embodiment of the present invention includes a double stator-double rotor type motor 100a and a drone arm 22a-22d using the motor 100a. ) includes a motor seating portion 12 for seating in the .

The motor seating part 12 has a circular cup shape, and serves as a motor casing as well as seating the motor 100a on the arms 22a-22d of the drone.

The motor seating part 12 extends upward along the longitudinal direction at the inner center of the circular cup-shaped casing 12a and the casing 12a, and has upper and

lower bearings

52 and 54 installed therein. 14) is included.

The motor 100a according to the second embodiment that can be employed in the propeller driving device of the present invention is a lady in which an inner stator 210 and an outer stator 310 are arranged on the inside and outside of the double rotor 110 in a circumferential shape. It constitutes a radial gap type motor.

The motor 100a according to the second embodiment of the present invention is the same as the first embodiment in that it has a double stator-double rotor structure, but the double rotor 110 has a plurality of inner and outer sides of the annular back yoke 116 The N-pole and S-pole magnets 112 and 1114 of the are alternately arranged, the annular back yoke 116 is connected to one rotation shaft 50, and the inner stator 210 and the outer stator 310 are cylindrical. There is a difference in that it is separated into the inner side of the casing (12a) and the outer side of the bearing housing (14).

The outer stator 310 is mounted inside the casing 12a, and the rotating shaft 50 connected to the annular back yoke 116 of the double rotor 110 has both ends of the motor casing or the upper portion mounted on the bearing housing 14. and rotatably supported by the

lower bearings

52 and 54 .

The inner stator 210 includes an inner stator core 212 in which a plurality of inner teeth each having a “T” shape extend radially from an annular yoke and an inner stator coil wound on the inner teeth of the inner stator core 212 ( 214), wherein the outer stator 310 has an outer stator core 312 in which a plurality of outer teeth each having a “T” shape extend radially inward from the annular yoke, and the outer teeth of the outer stator core 312 . It includes an outer stator coil 314 wound on the.

The inner stator 210 is provided with a through hole in the center of the annular yoke, and the bearing housing 14 in which the upper and

lower bearings

52 and 54 are installed may be inserted into the through hole.

The motor 100a according to the second embodiment may operate substantially the same as that of the first embodiment.

That is, the magnet 112 disposed on the inside of the annular back yoke 116 by the rotating magnetic field generated by the inner stator 210 forms an inner rotor, and a propeller coupled to the rotating shaft 50 while the inner rotor rotates ( 70), the magnet 114 disposed on the outside of the annular back yoke 116 forms an outer rotor, and a three-phase AC voltage can be obtained from the outer stator 310 disposed to face the outer rotor. .

In the description of the second embodiment, a structure in which the inner rotor and the inner stator are used as a driving motor, and the outer rotor and the outer stator are used as a generator by using the motor 100a of the double stator-double rotor structure were described as an example, The present invention is not limited thereto.

In general, as in the first embodiment shown in FIGS. 2 and 3 , the outer rotor 40 having a larger diameter has a larger rotational torque than the inner rotor 30 having a smaller diameter. Therefore, by driving the outer rotor 40 having a large rotational torque as the outer stator 60b to obtain a large rotational torque, the inner rotor 30 is rotated accordingly to drive the inner stator 60a, and from this, three phases are obtained. It may also be considered to increase the overall motor efficiency by obtaining AC power.

That is, in the present invention, in the motor 100a of the double stator-double rotor structure, the outer rotor and the outer stator may be used as a generator, and the inner rotor and the inner stator may be used as a driving motor.

In addition, in the description of the first embodiment, in the motor 100 of the double stator-double rotor structure, the outer rotor 40 and the outer stator 60b having a large diameter are the inner rotor 30 and the inner stator 60a having a small diameter. Although it is exemplified that the number of poles and the number of slots are set larger than that, the number of poles and the number of slots can be changed differently depending on whether the outer motor and the inner motor are set for either a generator or a driving motor.

6 and 7, the propeller driving device 10 according to the third embodiment of the present invention includes a motor casing 12a having a circular cup shape and an inner stator 210 inside the motor casing 12a. and a single rotor 40 disposed between the outer stator 310 and a double stator-single rotor type motor 100b.

The motor casing 12a serves as a motor seating part for seating the motor 100b on the arms 22a-22d of the drone 200 .

The motor casing 12a includes a bearing housing 14 extending upward in a cylindrical shape in the longitudinal direction at the center of the motor casing and having upper and

lower bearings

52 and 54 installed therein.

The double stator-single rotor type motor 100b is configured as a radial gap type motor in which a single rotor 140 is disposed between the inner stator 210 and the outer stator 310 .

The rotor 140 uses an isotropic magnet 142 in which both sides are simultaneously magnetized, and the inner surface of the magnet 142 without a separate back yoke constitutes an inner stator 210 and a driving motor or generator, and the magnet 142 The outer surface of the may be used as a generator or a driving motor together with the outer stator 310 .

In the present invention, the rotor 140 is generally an isotropic magnet that simultaneously magnetizes both sides instead of an anisotropic magnet that can maximize efficiency by increasing the Gauss value of the magnet surface only when there is a back yoke on the opposite side of the used surface ( 142) to utilize both sides of the magnet 142 without a separate back yoke.

The isotropic magnet 142 used in the rotor 140 may be configured as a cylindrical magnet in which a plurality of N-pole and S-pole poles are alternately divided and magnetized when both surfaces are simultaneously magnetized.

In this case, one end of the isotropic magnet 142 of the rotor 140 is connected to the rotor support 144 , and the central portion of the rotor support 144 is rotatable to the upper and

lower bearings

52 and 54 . The supported rotation shaft 50 is connected.

As a result, the rotation output of the rotor 140 is output to the outside through a single rotation shaft 50 , and rotates the propeller 70 coupled to the rotation shaft 50 .

The inner stator 210 includes an inner stator core 212 in which a plurality of inner teeth 212b each having a “T” shape extend radially from an annular back yoke 212a and an inner tooth of the inner stator core 212 . and an inner stator coil 214 wound around 212b.

In addition, the outer stator 310 includes an outer stator core 312 in which a plurality of outer teeth 312b each having a “T” shape extend radially inward from the annular back yoke 312a and the outer stator core 312 . It includes an outer stator coil 314 wound on the outer teeth 312b of the .

The inner teeth 212b of the inner stator core 212 and the outer teeth 312b of the outer stator core 312 include an insulator (or bobbin) made of an insulating material integrally formed to surround the outer circumferential surface on which each coil is to be wound. can be formed.

The inner teeth 212b of the inner stator core 212 and the outer teeth 312b of the outer stator core 312 are each formed in a “T” shape, and the isotropic magnet 142 and the opposing shoe (shoe) portion and the annular There is a winding region in which the

coils

214 and 314 are wound between the

back yokes

212a and 312a.

In the third embodiment shown in FIGS. 6 and 7, the inner teeth 212b of the inner stator core 212 and the outer teeth 312b of the outer stator core 312 have the same teeth (slots), and However, the present invention is not limited thereto and may be changed differently.

In the present invention, the outer stator 310 having a relatively larger diameter than the inner stator 210 is allocated for the generator, and the number of teeth (slots) of the outer stator 310 can be formed more than that of the inner stator 210. . Also, in response to this, the number of magnetic poles on the outer surface of the inner and outer surfaces of the isotropic magnet 142 may be set to be larger than the number of magnetic poles on the inner surface.

In addition, the inner stator core 212 and the outer stator core 312 may be formed of electric steel (silicon steel sheet) to form a path for forming a magnetic circuit.

The inner stator 210 is supported on the outer periphery of the bearing housing 14 , and the outer stator 310 is supported and mounted on the inner periphery of the motor casing 12a.

The rotating shaft 50 connected to the rotor 140 is rotatably supported by upper and

lower bearings

52 and 54 installed inside the bearing housing 14 .

The inner surface of the isotropic magnet 142 constitutes the inner stator 210 and a driving motor or generator, and the outer surface of the isotropic magnet 142 together with the outer stator 310 may be used as a generator or a driving motor.

The propeller driving device 10 according to the third embodiment of the present invention is an isotropic magnet 142 by a rotating magnetic field generated by any one of the inner stator 210 and the outer stator 310 serving as a driving motor. The propeller 70 coupled to the rotation shaft 50 is rotated by rotating the rotor 140 having An alternating voltage can be obtained.

As described above, in the third embodiment of the present invention, the double stator-single rotor type motor 100b can be used to simultaneously drive the load and generate power, thereby increasing the flight time.

In addition, since the motor 100b of the third embodiment is a radial gap type in which a single rotor 140 is disposed between the inner stator 210 and the outer stator 310, it can be implemented with a compact size. In addition, it is possible to adopt a small capacity of the drone's built-in battery.

In the above embodiment description, the double stator-single rotor or double rotor structure of the motor rotating shaft 50 exemplifies the rotational driving of the exposed propellers 70a-70d, but the propeller or blade is built-in inside the cylindrical casing. The fan structure can be changed.

In the above embodiment description, it is illustrated that a plurality of propeller driving devices 10a-10d are applied to a multicopter-type drone installed on a plurality of arms 22a-22d extending from the drone main body 20, but the present invention is a single propeller The driving device may have a structure installed on the upper side of the drone body.

In addition, the present invention exemplifies the application of a logistics box for delivering parcels to a logistics field that is detachably provided in the lower part of the drone body, but monitoring / reconnaissance / search, prevention / control / spraying, broadcasting / performance, It can be variously changed for various purposes such as environmental surveying and structure.

In the above, the present invention has been illustrated and described with examples of specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and within the scope of not departing from the spirit of the present invention, common knowledge in the technical field to which the present invention belongs Various changes and modifications will be possible by those who have

The present invention can be applied to a drone that can increase flight time even with a compact size because it can simultaneously drive and generate power by using a double-stator-single-rotor or double-rotor type motor.

Claims

double stator-double rotor type motor; and

It includes; a motor seating part for seating the motor on the arm of the drone.

The motor is a radial gap type in which an inner rotor and an outer rotor are circumferentially arranged with an air gap on the inside and outside of the double stator, respectively,

The double stator includes an inner stator formed on the inner side of the annular back yoke and an outer stator formed on the outer side, any one of the inner stator and the outer stator is set as a generator, and the other is set as a driving motor. Device.
According to claim 1,

The double stator

a stator core having a plurality of inner and outer teeth radially extending inside and outside the annular back yoke having a predetermined width to form a magnetic circuit;

an insulator made of an insulating material that surrounds an outer circumferential surface on which each of the plurality of inner teeth and the outer teeth is to be wound; and

Including; an inner and outer stator coil wound around the outer peripheral surface of the insulator, respectively, the plurality of inner and outer teeth,

The annular back yoke is a propeller driving device having a plurality of through holes for fixing the double stator to the motor seating portion using a fixing bolt.
According to claim 1,

The inner rotor is

A magnet is disposed on the outside of the cylindrical first back yoke disposed between the inner side of the double stator and the bearing housing,

The outer rotor has a magnet disposed on the inside of the cylindrical second back yoke disposed with a preset air gap with the outside of the double stator,

One end of the first back yoke and the second back yoke is connected to each other, and a rotation shaft is connected to a central portion thereof.
According to claim 1,

The motor mounting part

casing in the form of a round cup;

a bearing housing extending upwardly from the inner center of the casing and having upper and lower bearings installed therein; and

A propeller driving device comprising a; a plurality of bolt fastening projections to which a plurality of fixing bolts for fixing and installing the stator to the bottom of the casing are fastened at a distance from the bearing housing on the bottom of the casing.
According to claim 1,

The motor is a propeller driving device in which an inner rotor and an inner stator are set as one of a generator and a driving motor, and an outer rotor and an outer stator are set as the other of the generator and the driving motor.
double stator-double rotor type motor; and

Including; a motor seating part for seating the motor on the arm of the drone.

the motor is

a double rotor in which a plurality of N-pole and S-pole magnets are alternately disposed on the inner and outer sides of the annular back yoke;

a rotating shaft connected to the center of the annular back yoke; and

Including; an inner stator and an outer stator disposed with an air gap on the inside and outside of the double rotor, respectively,

Any one of the inner stator and the outer stator is set as a generator, and the other is set as a driving motor.
7. The method of claim 6,

The motor mounting part

round cup-shaped casing; and

A propeller driving device comprising a; a bearing housing extending upward along the longitudinal direction at the inner center of the casing and having upper and lower bearings installed inside the housing.
a motor casing formed in a circular cup shape, extending from the bottom to the top in a cylindrical shape in the center of the inner center, and integrally provided with a bearing housing having upper and lower bearings installed therein;

an inner stator supported on the outer periphery of the bearing housing;

an outer stator supported inside the motor casing;

a rotor disposed between the inner stator and the outer stator; and

A rotary shaft rotatably supported on the upper and lower bearings, one end of the rotor is connected, and a propeller is connected to the front end;

Any one of the inner stator and the outer stator is set as a generator, and the other is set as a driving motor.
9. The method of claim 8,

The rotor disposed between the inner stator and the outer stator is a radial gap type double stator-propeller driving device forming a single rotor type motor.
9. The method of claim 8,

The rotor is configured using an isotropic magnet that is simultaneously magnetized on both sides without a back yoke,

An inner surface of the isotropic magnet forms an inner stator and a drive motor or a generator, and an outer surface of the magnet forms a generator or a drive motor together with the outer stator.
A rotor in which a plurality of N poles and S poles are alternately arranged on the inside and outside, respectively, by simultaneously magnetizing both sides of the isotropic magnet;

a rotating shaft connected to one side of the rotor; and

Including; an inner stator and an outer stator disposed with an air gap on the inside and outside of the rotor, respectively,

Any one of the inner stator and the outer stator is set as a generator, and the other is set as a driving motor.
12. The method of claim 11,

a motor casing formed in a circular cup shape and integrally provided with a bearing housing extending from the bottom to the top in a cylindrical shape at the inner center;

a bearing housing extending from the bottom to the top along the longitudinal direction in a cylindrical shape at the inner center of the motor casing; and

It further includes; upper and lower bearings disposed at intervals inside the bearing housing and rotatably supporting the rotation shaft,

A propeller driving device in which a rotating shaft is connected to one end of the magnet of the rotor, and a propeller is connected to a front end of the rotating shaft.
A drone body having at least a battery, a wireless communication unit, and a control device inside the casing; and

At least one propeller driving device installed on the drone body or a plurality of arms extending from the outer periphery of the drone body to drive the propeller;

The drone driving device is the propeller driving device according to any one of claims 1 to 12.