KR102435814B1 - Multicopter Motor - Google Patents

Abstract

The present invention relates to a motor for a multicopter, and the present invention relates to a holder comprising a shaft coupling tube having a shaft coupling hole having a structure penetrating through the center; a rotating shaft inserted into the shaft coupling hole to rotate; a stator fitted to the outside of the shaft coupling pipe and fixed to the holder, the stator including cores disposed in a plurality of rows along the axial direction of the shaft coupling pipe at an outer edge of the holder; A plurality of magnets that are shaft-coupled to the rotation shaft and arranged in a structure surrounding the stator to form a plurality of rows along the axial direction of the shaft-coupled tube on the inner circumferential surface facing the outer edge of the stator to correspond to the cores a rotor for providing rotational force to the rotating shaft by rotating along an outer edge of the stator using a rotating magnetic field formed between the cores and the magnets by an alternating current applied to the cores; and a core spacer arranged between rows of cores along an outer circumferential surface of the shaft coupling tube to space the rows of cores apart from each other, wherein the core spacer is formed in a cylindrical shape having a penetrated structure to form the shaft coupling pipe. By being fitted to the spaced ring portion disposed between the rows of the cores so that the adjacent cores are stacked spaced apart from each other by a set distance; And extending from the spaced ring portion, is formed to be bent in a structure that covers the inner corners of the adjacent cores, the refracted portion is seated in a structure surrounding the inner side of the adjacent cores, the spaced ring portion of the shaft coupling tube Provided is a motor for a multicopter comprising an articulated fixed jaw that suppresses movement in a direction transverse to the axial direction.
According to the present invention, by easily arranging the cores in a plurality of rows using a core spacer, the rotating magnetic fields to which power is supplied can be formed in several rows, so that flight stability of the multicopter can be improved even if there is a disconnection or short circuit of the rotating magnetic field in some rows. It can be maintained, and by generating respective propulsion power by matching a plurality of power sources and a plurality of magnetic fields, it is possible to provide more efficient propulsion power compared to the existing BLDC motor.

Description

Motor for multicopter {Multicopter Motor}

The present invention relates to a motor for a multicopter, and more particularly, when the cores and magnets of the stator are arranged in two upper and lower rows to be driven by a separate power source, it is possible to easily align the cores in two upper and lower rows using a core spacer. It relates to a motor for a multicopter that can be

The propulsion power of a multicopter is usually obtained using a motor. The motor is an engine for the flight of the multicopter and is connected to the propeller to generate downward thrust according to the rotation, thereby levitating the multicopter into the air. As a motor for such a multicopter, an out-runner type BLDC motor (Brushless Direct Current motor) is mainly used.

The outrunner type motor has a structure in which the rotor is placed on the outer periphery of the DC motor to form a rotating magnetic field on the inner side of the motor. The motor uses a permanent magnet as a rotor and a coil (electromagnet) as a stator to change the direction of the current flowing through the coil to generate torque even when the wires are not in contact, and this control can be done through software. .

Specifically, the N/S pole is created through the current direction of the stator, and the rotor is rotated by pulling or pushing the N/S pole of the rotor. It can be changed to flow more efficiently.

However, when a failure such as disconnection or short circuit occurs in one of these coils, it is difficult to form a rotating magnetic field inside the motor, and thus there is a problem in that it is not possible to stably obtain the propulsion power required for the flight of the multicopter.

『Korea Patent Publication No. 10-1215978』

An object of the present invention is to provide a motor for a multicopter in which stator cores and rotor magnets are provided in upper and lower two rows so that stable propulsion power can be obtained even when the stator coil is disconnected or short circuited.

In order to achieve this object, the present invention, a holder comprising a shaft coupling tube having a shaft coupling hole having a structure penetrating through the center; a rotating shaft inserted into the shaft coupling hole to rotate; a stator fitted to the outside of the shaft coupling pipe and fixed to the holder, the stator including cores disposed in a plurality of rows along the axial direction of the shaft coupling pipe at an outer edge of the holder; A plurality of magnets that are shaft-coupled to the rotation shaft and arranged in a structure surrounding the stator to form a plurality of rows along the axial direction of the shaft-coupled tube on the inner circumferential surface facing the outer edge of the stator to correspond to the cores a rotor for providing rotational force to the rotating shaft by rotating along an outer edge of the stator using a rotating magnetic field formed between the cores and the magnets by an alternating current applied to the cores; and a core spacer arranged between rows of cores along an outer circumferential surface of the shaft coupling tube to space the rows of cores apart from each other, wherein the core spacer is formed in a cylindrical shape having a penetrated structure to form the shaft coupling pipe. By being fitted to the spaced ring portion disposed between the rows of the cores so that the adjacent cores are stacked spaced apart from each other by a set distance; And extending from the spaced ring portion, is formed to be bent in a structure that covers the inner corners of the adjacent cores, and the refracted portion is seated in a structure surrounding the inner side of the adjacent cores, whereby the shaft coupling tube of the spaced ring portion Provided is a motor for a multicopter comprising an articulated fixed jaw that suppresses movement in a direction transverse to the axial direction.

According to the present invention, there are the following effects.

First, by easily arranging the cores in a plurality of rows using a core spacer, it is possible to form several rows of rotating magnetic fields to which power is supplied, respectively, so even if there is a disconnection or short circuit of the rotating magnetic field in some rows, the flight stability of the multicopter can be maintained. .

Second, it is possible to provide more efficient propulsion power compared to the existing BLDC motor by generating respective propulsion powers by matching a plurality of power sources and a plurality of magnetic fields.

1 is a perspective view of a motor for a multicopter according to an embodiment of the present invention.
2 is an exploded view of the motor for the multicopter of FIG. 1 .
FIG. 3 is a front cross-sectional view taken along a line A-A' for showing a support structure between the second row cores and magnets of FIG. 1 .
4 is a front cross-sectional view taken along the line B-B' for showing the support structure and coupling relationship of the cores in the second row of FIG. 1 .
5 is a partial view illustrating a coupling relationship between the cores and magnets in the second row of FIG. 4 .
6 is a partial view illustrating the structure of the core spacer of FIG. 5 .
7 is a partial view illustrating the structure of the magnet spacer of FIG. 5 .
8 is a partially enlarged view showing the Air-Gap according to the arrangement of the core and the magnet in the portion treated with the dashed-dotted line of FIG. 3 .
9 is a partial enlarged view showing the distance between magnets according to the arrangement of the magnets in the portion treated with the dashed-dotted line of FIG. 3 .

1 to 3, the overall configuration of the motor 100 for a multicopter according to an embodiment of the present invention is shown in detail.

1 to 3 , the motor 100 for a multicopter according to an embodiment of the present invention includes a holder 110 , a driving module 120 , a stator 130 , a core spacer 140 , and a rotor 150 . and a magnet spacer 160 .

The holder 110 constitutes the base 111 of the motor 100, accommodating and supporting the stator 130 and the rotor 150 thereon, the base 111, the shaft coupling pipe 112, and the inner step. (113), including an outer fitting sill 114 and an outer stepped 115.

The base 111 is for accommodating and supporting the stator 130 and the rotor 150, which will be described later, and includes an inner periphery formed in a disk shape and an outer periphery formed in a structure inclinedly bent upward from the end of the inner periphery. Including, a plurality of exhaust ports (111b) having a structure penetrating through the inner periphery are formed at regular intervals along the circumferential direction, and a plurality of coil outlet holes (111a) having a structure penetrating through the outer periphery are at regular intervals along the circumferential direction. is formed

The shaft coupling pipe 112 is for accommodating the driving module 120 to be described later, is formed in the center of the inner periphery of the base 111, is formed to extend along the longitudinal direction of the holder 110, and has a structure penetrating the center. It includes a shaft coupling hole (112a).

The inner step 113 is provided so that the bearings for supporting the rotation shaft 121 to be described later installed in the inner side of the shaft coupling pipe 112, that is, the shaft coupling hole 112a are spaced apart from each other by a predetermined distance along the shaft coupling hole 112a. As a separation, it is formed to protrude along the circumferential direction from the middle portion of the shaft coupling hole (112a).

When a pair of core rows 131 and 132 installed along the outer periphery of the shaft coupling pipe 112 are fitted to the shaft coupling pipe 112, the outer fitting jaw 114 includes the core rows 131, In order to prevent the fixing and circumferential rotation of the shaft coupling pipe 112 , the projections are formed to protrude radially from the outer circumferential surface of the shaft coupling pipe 112 , and protrude into a plurality of protrusions at regular intervals along the circumferential direction of the shaft coupling pipe 112 , respectively. It is formed extending along the longitudinal direction of the coupling pipe (112). In addition, screw coupling holes 114a are respectively formed on the upper surface of the above-described outer fitting jaws 114, and the screw heads 114b for coupling are respectively screwed to the screw coupling holes 114a, and the protruding screw heads will be described later. The pair of core rows (131, 132) serves as a locking jaw to prevent the upper and lower flow. At this time, the coupling screw 114b is coupled to the screw coupling hole 114a and has a large radius so that the screw head can protrude more outward than the outer fitting protrusion 114 .

The outer step 115 is such that the second core ring 132a to be described later installed along the outer periphery of the shaft coupling pipe 112 is mounted at a predetermined height from the base 111 of the holder 110, the shaft coupling pipe ( 112) is formed to protrude along the circumferential direction from the middle of the outer circumferential surface.

The support structure and the coupling structure of the core rows 131 and 132 by the above-described outer fitting ridge 114 and the outer stepped 115 will be described in detail again with reference to FIGS. 6 and 7 to be described later.

The driving module 120 is accommodated in the aforementioned shaft coupling hole 112a and rotates to provide a rotational driving force to the propeller (not shown) of the multicopter coupled to the upper end, the rotation shaft 121, the shaft head 122, It includes a first bearing 123 , a second bearing 124 , a fixing nut 125 , packings 126 , and a washer 127 .

The rotating shaft 121 is a rotating body that is accommodated in the center of the shaft coupling hole 112a, is formed in a cylindrical shape, and is inserted and received in the shaft coupling hole 112a in the axial direction.

The shaft head 122 shaft-couples the upper end of the rotary shaft 121 and the rotor cover 151 to be described later, and is formed in a disk shape having an outer diameter wider than the outer diameter of the rotary shaft 121, and the upper end of the rotary shaft 121 and By being bolted to the rotor cover 151 in the coupled or integrated state, the rotational force of the rotor 150 is transmitted to the rotating shaft 121 .

The first bearing 123 and the second bearing 124 are disposed between the rotating shaft 121 and the shaft coupling pipe 112 to reduce wear and loss when the rotating shaft 121 is supported on the shaft coupling pipe 112 . To be respectively installed, the first bearing 123 is installed on the upper portion of the above-described inner step 113 , and the second bearing 124 is installed on the lower portion of the inner step 113 , and the interval thereof is increased by the inner step 113 . kept constant

The fixing nut 125 not only fixes the rotating shaft 121 to the holder 110 but also presses the second bearing 124 to connect the second bearing 124 together with the inner stepped 113 to the shaft coupling hole 112a. By fixing it inside, it is screwed to the lower end of the rotary shaft 121 and presses the lower portion of the second bearing 124 using an outer diameter wider than the outer diameter of the rotary shaft 121 . At this time, between the fixing nut 125 and the second bearing 124, the packings 126 for increasing the friction force and a washer 127 for dispersing the load of the fixing nut 125 along the circumferential direction are further installed. Of course it could be.

The stator 130 is fitted on the outside of the shaft coupling tube 112 and arranged and fixed along the outer edge of the holder 110 to form a rotating magnetic field by alternating current, the first core row 131 and the second core row Each core row (131, 132) including a plurality of cores (C) disposed along the circumferential direction of the shaft coupling pipe 112, including the 132, is again along the axial direction of the shaft coupling pipe 112 It may be arranged in plurality.

As described above, the core spacer 140 is inserted into the shaft coupling tube 112 and disposed between the first core row 131 and the second core row 132 , and thus the first core row 131 and the second core row 131 . The core row 132 is spaced apart at regular intervals along the axial direction of the shaft coupling pipe 112 and fixed. Here, the support structure and coupling structure of the core rows 131 and 132 by the core spacer 140 and detailed functions according to the shape and structure of the core spacer 140 will be described in detail again with reference to FIGS. 4 to 6 to be described later. decide to do

The rotor 150 rotates the magnet M along the circumferential direction of the stator 130 by the rotating magnetic field provided by the above-described stator 130 including the magnet M, thereby transferring the rotational driving force to the rotation shaft 121 . It includes a rotor cover 151 , a yoke 152 , a first magnet row 153 , and a second magnet row 154 .

The rotor cover 151 connects the yoke 152 and the rotation shaft 121 to transmit the rotational force of the yoke 152 to the rotation shaft 121. 121) is bolted by the above-described shaft head 122 in a state of being fitted to the rotation shaft 121 and shaft-coupled. At this time, the rotor cover 151 has a plurality of inlets 151a through which the outside air is introduced are formed at regular intervals along the circumferential surface of the rotor cover 151, and are formed at positions corresponding to the positions of the first coils 131d, so that the outside air is provided. That is, by providing the down air flow formed by the rotating propeller to the coils C of the stator 130, the coils C are radiated. As described above, the outside air that radiates heat from the coils (C) is discharged to the outside through the exhaust port (111b) formed in the holder (110) base (111). In addition, on the lower surface of the rotor cover 151 close to the shaft coupling pipe 112, a pressing jaw 151b having a structure protruding in a cylindrical shape is formed, so that the rotor cover 151 is rotated by the shaft head 122 to rotate the shaft 121. When coupled to the shaft, the pressing jaw (151b) presses the upper portion of the first bearing (123), thereby limiting the radius of flow in the vertical direction of the first bearing (123) together with the inner stepped (113). Here, the pressing jaw 151b is preferably formed to protrude to press only the inner portion of the first bearing 123 in order to reduce the weight of the motor 100 .

The yoke 152 has a magnet (M) installed on the inner circumferential surface and the magnet (M) is rotated by the rotating magnetic field formed by the coils (C) to transmit the rotational force formed to the above-described rotor cover (151), cylindrical It is formed as an upper surface and is coupled to the end of the rotor cover 151 to cover the outer circumferential surface of the stator 130 .

The first magnet row 153 is a set of a plurality of first magnets 153a arranged at regular intervals along the inner circumferential surface of the yoke 152 , and the first magnets 153a are respectively bonded to the upper portion of the yoke 152 and combined. and maintain a predetermined distance from the second magnet column 154 by the magnet spacer 160 . In this case, the shape and size of the first magnet 153a is preferably formed in a rectangular shape to correspond to the wound structure of the first coil 131d.

The second magnet row 154 is a set of a plurality of second magnets 154a arranged at regular intervals along the inner circumferential surface of the yoke 152 in the same manner as the first magnet row 153, and is located at the lower portion of the yoke 152. The two magnets 154a are respectively bonded and coupled, and also maintain a predetermined distance from the first magnet column 153 by the magnet spacer 160 .

As described above, the magnet spacer 160 is installed between the first magnet row 153 and the second magnet row 154 on the inner circumferential surface of the yoke 152, the first magnet row 153 and the second magnet row ( 154) to form a plurality of magnet accommodating grooves for accommodating the first magnets 153a and the second magnets 154a together with the yoke 152.

Hereinafter, the coupling relationship between the core rows 131 and 132 and the detailed configuration and function of the core spacer 140 will be described in detail with reference to FIGS. 4 to 6 .

Looking at the shapes and structures of the core rows 131 and 132 and the core spacer 140 with reference to FIGS. 4 to 6 , the motor 100 for a multicopter of the present invention has two rows of first core rows ( 131) and a second core row 132 and a core spacer 140 for stacking the core rows 131 and 132 spaced apart from each other by a predetermined distance.

The first core row 131 is a row of cores (C) disposed on the upper end of the shaft coupling, and maintains a predetermined distance from the second core row 132 by the core spacer 140, and the first core ring 131a ), a first fitting hole 131b, a first core 131c, and a first coil 131d. The first core ring 131a is a base 111 of the first core row 131 fitted to the shaft coupling pipe 112 , and has a cylindrical shape having an inside so that it can be fitted into the shaft coupling pipe 112 . is formed with The first fitting hole 131b is a groove formed along the axial direction of the cylindrical first core ring 131a so that the first core ring 131a can be fitted in the height direction to the above-described outer fitting jaw 114. , is formed on the inner peripheral surface of the first core ring (131a) and is formed in a shape corresponding to the outer fitting projection (114). The first core teeth 131c are projections extending radially from the outer circumferential surface of the first core ring 131a so that the first coil 131d is wound, and are formed at regular intervals along the circumferential direction of the first core ring 131a. is formed in plurality, and the end thereof has a structure in which a radius thereof is extended in a direction perpendicular to the direction of extension in order to prevent separation of the first core row 131 wound around the first core ring 131a. As described above, the first coil 131d is wound around the first core 131c to form a rotating magnetic field using an alternating current applied from a power supply (not shown, battery).

The second core row 132 is mounted on the outer step 115 of the shaft coupling pipe 112 and is disposed at the lower end of the first core row 131 , and is formed through the core spacer 140 as described above. 1 maintain a certain distance along the axial direction of the core row 131 and the shaft coupling pipe 112 . The second core row 132 also includes a second core ring 132a, a second fitting hole 132b, a second coitus and a second coil 132d in the same manner as the first core row 131, and the The shape, structure, and corresponding functions are the same as the detailed configurations of the first core array 131 , and a detailed description thereof is replaced with the description of the first core array 131 .

The core spacer 140 is such that the first core row 131 is stacked on top of the second core row 132 and stacked while maintaining a certain height, and the separation ring portion 141 and the refractive fixing jaws 142 are stacked. ) is included. The spaced ring portion 141 is formed in a cylindrical shape through which the inside is inserted and fitted to the shaft coupling pipe 112 , and is disposed between the first core row 131 and the second core row 132 . At this time, the separation ring portion 141 supports the lower portion of the first core row 131 in a state of supporting the upper portion of the second core row 132 so that the first core row 131 is the second core row 132 . It should be stacked in a state spaced apart from the upper part by a certain height.

The spaced ring portion 141 is formed in a cylindrical shape through which the inside is penetrated and fitted to the shaft coupling pipe 112, so that it is disposed between the first core row 131 and the second core row 132 and the second core row. The first core row 131 is stacked in a state spaced apart from the upper part of the second core row 132 by a predetermined height by supporting the lower part of the first core row 131 in a state in which the upper part of the 132 is supported. In addition, a plurality of coil guide grooves 141a having an upper recessed structure are formed in the spaced ring portion 141 at regular intervals along the circumferential direction. The coil guide groove 141a allows the first coil 131d wound around the first core 131c to be disposed along the outer circumferential surface of the shaft coupling tube 112, so that when the rotor 150 rotates, the rotor ( 150) so that the extension lines of the magnet M and the first coil 131d do not interfere with each other. In addition, the coil guide groove 141a may be formed in a structure in which an upper portion is recessed as described above, but may have a structure in which a lower portion is retracted or a structure in which a side portion is penetrated.

Refraction fixed jaw 142 is formed to be coupled or integrated with the inner circumferential surface of the spaced ring portion 141, extending from the inner circumferential surface of the spaced ring portion 141 toward the imaginary axial center of the spaced ring portion 141 (start end) It is refracted again and extended along the axial direction of the separation ring portion 141 (end), and the core spacer 140 is formed using a starting end connected to the inner circumferential surface of the separation ring portion 141 to form a second core row ( 132) so as to be seated on the upper surface of the second core teeth 132c, and the core spacer 140 is connected to the start end and extended using the end of the shaft coupling tube from the upper surface of the second core teeth 132c. By not flowing in a direction transverse to the direction (horizontal direction), the position of the core spacer 140 is constantly maintained.

At this time, as described above, the extension line of the first coil 131d guided to the outer circumferential surface of the shaft coupling pipe 112 along the coil guide groove 141a is again along the refraction fixing jaw 142 of the shaft coupling pipe 112 . It is guided to the lower part, and in order to prevent a short circuit due to wear of the coil C, it is preferable that the corners of the coil guide groove 141a and the refractive fixing jaw 142 are all rounded.

On the other hand, looking at the coupling relationship between the core rows 131 and 132 and the core spacer 140 , in order to arrange the core rows 131 and 132 in a two-row structure, first, the second core row 132 is attached to the holder ( 110) is seated on the outer periphery. Specifically, in a state in which the second fitting hole 132b formed in the second core ring 132a of the second core row 132 is inserted into the outer fitting jaw of the holder 110, the second core ring 132a is tightened. It moves along the outer periphery of the shaft coupling tube 112 and is seated on the outer stepped 115 . Accordingly, the remaining parts except for the portion where the second core ring 132a and the outer fitting jaw face each other forms a structure spaced apart from the second core ring 132a by a predetermined interval rather than a structure in which the second core ring 132a is in close contact with the shaft coupling pipe 112 . .

Thereafter, the core spacer 140 is inserted into the shaft coupling tube 112 so that the starting end of the refractive fixing jaw 142 is seated on the upper surface of the second core 132c. In a state in which the core spacer 140 is seated, the first core row 131 is again seated on the outer periphery of the holder 110 . Also at this time, in a state in which the first core row 131 is fitted with the first fitting hole 131b formed in the first core ring 131a to the outer fitting jaw 114 of the holder 110, the first core ring ( 131a) is moved along the outer periphery of the shaft coupling tube 112 to be seated on the separation ring portion 141 of the core spacer 140 . When the first core ring 131a is seated, the first core ring 131a is fixed by fastening the coupling screw 114b to the screw coupling hole 114a. Again, except for the portion where the first core ring 131a and the outer fitting jaw 114 face each other, the first core ring 131a is not a structure in which the first core ring 131a is in close contact with the shaft coupling pipe 112, but is spaced apart from each other by a certain interval. to form

Here, as described above, a space in which the first core ring 131a and the second core ring 132a are spaced apart from the outer periphery of the shaft coupling tube 112 by a predetermined interval extends along the guide groove of the first coil 131d. Can be used as the outflow path (OP) of the first coil (131d) to be, the extension of the first coil (131d) guided along the outflow path (OP) exits the outflow path (OP) coil formed in the base (111) It extends to the outside along the outlet hole (111a) and is connected to the power supply of the multicopter. In addition, the second coil 132d extends from the start end (fixed end) side of the second core 132c to the outside along the coil outlet hole 111a to be connected to the power supply.

In this way, power is supplied from the power supply of the motor 100 to the first coil 131d and the second coil 132d that are leaked to the outside and connected to the power supply, so that the first core row 131 and the second core row ( By forming each rotating magnetic field in 132), even if one core row (131, 132) loses its driving force due to a failure such as disconnection or short circuit, the driving force is maintained through the remaining core rows (131, 132). It can ensure the flight stability of the multicopter. At this time, the first coil 131d and the second coil 132d are connected to the cores 131c and 132c of the respective coil arrays 131 and 132 with a single conductive wire by the coil C branched from the power supply. It goes without saying that the winding can form a rotating magnetic field at once depending on whether power is supplied or not, or annihilate the formed rotating magnetic field at once.

In addition, each core (C) is formed to have the same shape and size as the adjacent cores (C) and, and each magnet (M) is also formed to have the same shape and size as the adjacent magnets (M), facing the cores (C) and the magnet (M) are formed in a structure corresponding to each other, and also, the cores (C) and the magnets (M) corresponding to each other are arranged at the same intervals along the circumferential direction and the axial direction of the shaft coupling pipe 112, respectively, to each other It is preferable to respond. In addition, the cores C of each of the core rows 131 and 132 may be arranged in a parallel structure with the cores C of the adjacent core rows 131 and 132 or may be arranged in a staggered structure, and each magnet row ( The magnets M of 153 and 154 may also be arranged in a parallel structure with the magnets M of the adjacent magnet columns 153 and 154 to correspond to the arrangement structure of the cores C, or may be arranged in a staggered structure.

Hereinafter, the coupling relationship between the magnet columns 153 and 154 and the detailed configuration and function of the magnet spacer 160 will be described in detail with reference to FIGS. 3, 4 and 7 .

3, 4 and 7, the motor 100 for a multicopter of the present invention is to arrange the core rows 131 and 132 and the corresponding magnet rows 153 and 154 in a two-row structure, The first core row 131 and the second core row 132 radially disposed along the circumferential direction of the shaft coupling pipe 112 described above are formed by the core spacer 140 in the height direction of the shaft coupling pipe 112 . The first magnet column 153 and the second magnet column 154 are spaced apart from each other by a predetermined distance along It is disposed at positions corresponding to the first core row 131 and the second core row 132 in a state where the distance is kept constant. Here, the magnets (M) of the two-row structure are disposed in the rotor cover 151 in a state of being inserted into the magnet receiving groove formed by the magnet spacer 160 and the yoke 152, and are applied to the rotating magnetic field formed by the cores (C). rotated by

Each of the magnets (M) is preferably divided by a magnet spacer 160 partially or entirely composed of a non-magnetic material in order to form a divided magnetic field, and thus, the magnet spacer 160 is a vertical frame ( 161), a horizontal frame 162 and a magnet cover body 163. In an embodiment of the present invention, it is assumed that all of the magnet spacers 160 are non-magnetic.

The vertical frame 161 is respectively disposed between the plurality of magnets M arranged in the horizontal direction of the first magnet column 153 and the second magnet column 154, and the magnets M adjacent to each other in the horizontal direction. They are arranged to be spaced apart from each other by a predetermined distance in the horizontal direction, and the horizontal frame 162 crosses between the plurality of magnets M disposed in the vertical direction of the first magnet column 153 and the second magnet column 154 . By extending along the inner circumferential surface of the yoke 152, the magnets M adjacent to each other in the vertical direction are arranged to be spaced apart from each other by a predetermined interval in the vertical direction. The magnet cover body 163 is formed to extend along the inner surfaces of the magnets M divided by the vertical frame 161 and the horizontal frame 162, respectively, and has a cylindrical shape through which the start end and the end are connected to each other. By being coupled or integrated with the vertical frame 161 and the horizontal frame 162, respectively, the vertical frame 161 and the horizontal frame 162 are also coupled or integrated with each other, as well as the above-described yoke 152. A plurality of magnet accommodating grooves for accommodating the magnets (M) together with the inner circumferential surface, the vertical frame 161 and the horizontal frame 162 are formed.

In addition, it is preferable that the above-described vertical frame 161 and the horizontal frame 162 are formed to have the same thickness to divide each magnet M in a horizontal direction and a vertical direction, but leakage of the bonding material generated in the assembly process Of course, in order to reduce the weight of the multicopter, the thickness of the horizontal frame 162 is formed thinner than the thickness of the vertical frame 161, so the space S between the magnets M in the upper row and the magnets M in the lower row (S) ) is preferably formed. That is, when the magnet M is bonded and fixed to the inner circumferential surface of the yoke 152 in a divided state by being fitted by the magnet spacer 160, the bonding material is formed by the pressing force applied to the magnet spacer 160 for adhesion. In order to reduce the problem of protruding through the upper and lower portions or sides of the magnet and causing a post-treatment process to remove the protruding bonding material, the above-described separation space (S) is formed, as well as the magnet cover body (163). By using the closing space (S), it is possible to block the bonding material leaking in the direction of the core (C).

Hereinafter, the vertical spacing D _c of each of the core rows 131 and 132 that can optimize the rotational driving force of the motor 100 , the vertical spacing D _m of the magnet rows 153 and 154 and the core row ( 131 and 132 and the horizontal spacing D _a between the magnet columns 153 and 154 will be described in detail with reference to FIGS. 8 and 9 .

8 and 9, the distance (D _a ) between each of the core rows (131, 132) and the magnet rows (153, 154), that is, between the free ends of the core rows (131, 132) and the inner peripheral surface of the magnet (M) When the air gap, which is the interval, is about 0.35 within the section of 0.33 to 0.37, the driving efficiency can be maximized, and the distance between the magnet rows 153 and 154 (D _m ), that is, the uppermost end of the lower magnet (M). And the distance (D _m ) of the lowermost end of the upper end magnet (M) is greater than or equal to the above-described air gap, the first core row 131 and the second core row 132 When the distance (D _c ) or less, the driving efficiency is the maximum can be

Accordingly, each of the coil rows 131 and 132 and the magnet rows 153 and 154 are symmetrically disposed in the vertical and horizontal directions, and as described above, while maintaining the air gap at an interval of 0.33 to 0.37, the magnet (M) ) It is preferable to maintain the spacing (D _m ) in the vertical direction from more than to the spacing (D _c ) between the core rows (153 and 154) or less.

Although the present invention has been described with reference to the embodiment shown in the drawings, which is merely exemplary, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

100: motor for multicopter
110: holder 111: base
111a: coil outlet hole 111b: exhaust port
112: shaft coupling pipe 112a: shaft coupling hole
113: inner step 114: outer fitting jaw
114a: screw coupling hole 114b: coupling screw
115: outer step
120: drive module 121: rotation shaft
122: shaft head 123: first bearing
124: second bearing 125: fixing nut
126: packings 127: washer
130: stator 131: first core row
131a: first core ring 131b: first fitting hole
131c: first core 131d: first coil
132: second core row 132a: second core ring
132b: second fitting hole 132c: second core
132d: second coil
140: core spacer 141: spaced ring portion
141a: coil guide groove 142: refractive fixed jaw
150: rotor 151: rotor cover
151a: inlet 151b: press jaw
152: yoke 153: first magnet row
153a: first magnet 154: second magnet row
154a: second magnet
160: magnet spacer 161: vertical frame
162: horizontal frame 163: magnet cover body
OP: Outflow Path C: Coil, Core
M : Magnet D _m : Distance between magnet modules
D _c : Distance between cores D _a : Air Gap

Claims (17)

a holder including a shaft coupling tube having a shaft coupling hole having a structure penetrating through the center;
a rotating shaft inserted into the shaft coupling hole to rotate;
a stator fitted to the outside of the shaft coupling pipe and fixed to the holder, the stator including cores disposed in a plurality of rows along the axial direction of the shaft coupling pipe at an outer edge of the holder;
A plurality of magnets that are shaft-coupled to the rotation shaft and arranged in a structure surrounding the stator to form a plurality of rows along the axial direction of the shaft-coupled tube on the inner circumferential surface facing the outer edge of the stator to correspond to the cores a rotor for providing rotational force to the rotating shaft by rotating along an outer edge of the stator using a rotating magnetic field formed between the cores and the magnets by an alternating current applied to the cores; and
and a core spacer spaced apart from each other by being disposed between the rows of cores along the outer circumferential surface of the shaft coupling tube,
The core spacer,
A spaced ring portion formed in a cylindrical shape of a perforated structure and fitted to the shaft coupling tube, arranged between the rows of the cores so that adjacent cores are stacked spaced apart from each other by a set distance; and
Doedoe extending from the spaced ring portion, is formed to be bent in a structure that covers the inner corners of the adjacent cores, and the refracted portion is seated in a structure surrounding the inner side of the adjacent cores, whereby the axis of the shaft coupling tube of the spaced ring portion Includes a refractive fixed jaw that suppresses movement in a direction transverse to the direction,
The separation ring portion,
A plurality of coil guide grooves having a penetrating structure are formed at a set interval along the circumferential direction, so that the coil wound on the cores is guided to a path adjacent to the shaft coupling tube through the coil guide groove, thereby electrically connecting to the power supply. Connected motor for multicopter. delete The method according to claim 1,
The refractive fixed jaw,
A multicopter motor for reducing abrasion and loss of the coil guided through the coil guide groove by the corner by being rounded and rounded at the edge of the surface exposed to the outside. The method according to claim 1,
The stator is
a second core row in which a plurality of cores are disposed along the circumferential direction of the shaft coupling tube; and
It is positioned above the second core row along the axial direction of the shaft coupling pipe, and includes a first core row in which a plurality of cores are disposed along the circumferential direction of the shaft coupling pipe,
The rotor is
a plurality of magnets arranged along the circumferential direction of the shaft coupling tube, a second magnet row corresponding to the cores of the second core row, respectively; and
A motor for a multicopter including a first magnet row positioned above the second magnet row along the axial direction of the shaft coupling tube, and in which a plurality of magnets are disposed along the circumferential direction of the shaft coupling pipe. 5. The method according to claim 4,
The shaft coupling tube,
Outside fitting protrusions protruding at a plurality of set intervals along the circumferential direction on the outer circumferential surface and extending along the longitudinal direction of the shaft coupling tube; and
It includes an outer step protruding along the circumferential surface in a structure in which the outer diameter of the outer circumferential surface is extended in the middle and lower end portion,
The second core row,
A plurality of second fitting holes formed in a cylindrical shape and having a retracted structure corresponding to the outer fitting jaws are formed on the inner circumferential surface, and the second fitting holes are seated on the outer step in a state where they are respectively fitted to the outer fitting jaws. , A second core ring disposed to be spaced apart from the shaft coupling hole by a set interval;
a plurality of second core teeth spaced apart from each other by a set interval in the circumferential direction on the outer circumferential surface of the second core ring, the second core teeth extending radially from the outer circumferential surface of the second core ring and formed in a structure in which the width of the end is extended; and
A motor for a multicopter comprising a first coil wound on the second cortises, respectively, and electrically connected to each other. 6. The method of claim 5,
The first core row,
A plurality of first fitting holes formed in a cylindrical shape and having a retracted structure corresponding to the outer fitting jaws are formed on the inner circumferential surface, and the first fitting holes are seated on the core spacer in a state of being fitted to the outer fitting jaws, respectively. , A first core ring disposed to be spaced apart from the shaft coupling hole and the first core row by a set interval;
a plurality of first core teeth spaced apart from each other by a set interval in the circumferential direction on the outer circumferential surface of the first core ring, the first core teeth extending radially from the outer circumferential surface of the second core ring and formed in a structure in which the width of the end is extended; and
A motor for a multicopter comprising a first coil wound on the first cortises, respectively, and electrically connected to each other. 7. The method of claim 6,
The holder is
It is coupled to the screw coupling hole formed on the upper surface of the outer fitting jaw, and the rim of the head protrudes more than the outer fitting jaw to press the upper surface of the first core ring, so that the first core ring together with the core spacer Multicopter motor further comprising a screw for coupling to suppress the vertical flow. 5. The method according to claim 4,
The distance between the first core row and the first magnet row (Air Gap) is 0.33 to 0.37,
The distance between the second core row and the second magnet row (Air Gap) is 0.33 to 0.37,
Motor for multicopter. 5. The method according to claim 4,
The distance between the first magnet row and the second magnet row,
greater than the distance between the first core row and the first magnet row,
greater than the distance between the second core row and the second magnet row,
A motor for a multicopter that is less than or equal to a distance between the first core row and the second core row. The method according to claim 1,
The rotor is
It is shaft-coupled to the rotating shaft and formed to cover the upper portion of the stator, and includes a rotor cover having a plurality of inlets having a structure penetrating in the circumferential direction,
The holder is
It is coupled to the shaft coupling pipe and has a structure covering the lower portion of the stator, and a base having a plurality of exhaust ports having a structure penetrating in the circumferential direction so that the external air introduced through the inlet is discharged after dissipating the cores. A motor for a multicopter comprising a. The method according to claim 1,
The cores and the magnets,
Motors for multicopters that are each formed in the same shape and size. The method according to claim 1,
The cores and the magnets,
A motor for a multicopter in which cross-sections facing each other are formed in a structure corresponding to each other. The method according to claim 1,
The cores and the magnets,
A motor for a multicopter disposed at a set interval along the circumferential direction of the shaft coupling tube, and disposed at a set interval along the axial direction of the shaft coupling pipe at the same or different intervals as the circumferential direction. The method according to claim 1,
The cores are
They are arranged side by side with the up and down adjacent cores or are arranged to cross each other,
The magnets are
In the same manner as in the arrangement of the cores, the magnets are arranged in parallel with the up and down adjacent magnets or are arranged to alternate with each other, and the multicopter motor corresponds to the cores, respectively. The method according to claim 1,
Further comprising a power supply for supplying power to the stator,
The stator is
a second core row in which a plurality of cores are disposed along the circumferential direction of the shaft coupling tube; and
It is positioned above the second core row along the axial direction of the shaft coupling pipe, and includes a first core row in which a plurality of cores are disposed along the circumferential direction of the shaft coupling pipe,
The power supply unit,
A multicopter motor for applying power to the first core row and the second core row, respectively. a holder including a shaft coupling tube having a shaft coupling hole having a structure penetrating through the center;
a rotating shaft inserted into the shaft coupling hole to rotate;
a stator fitted to the outside of the shaft coupling pipe and fixed to the holder, the stator including cores disposed in a plurality of rows along the axial direction of the shaft coupling pipe at an outer edge of the holder;
A plurality of magnets that are shaft-coupled to the rotation shaft and arranged in a structure surrounding the stator to form a plurality of rows along the axial direction of the shaft-coupled tube on the inner circumferential surface facing the outer edge of the stator to correspond to the cores a rotor for providing rotational force to the rotating shaft by rotating along an outer edge of the stator using a rotating magnetic field formed between the cores and the magnets by an alternating current applied to the cores; and
and a core spacer spaced apart from each other by being disposed between the rows of cores along the outer circumferential surface of the shaft coupling tube,
The core spacer,
A spaced ring portion formed in a cylindrical shape of a perforated structure and fitted to the shaft coupling tube, arranged between the rows of the cores so that adjacent cores are stacked spaced apart from each other by a set distance; and
Doedoe extending from the spaced ring portion, is formed to be bent in a structure that covers the inner corners of the adjacent cores, and the refracted portion is seated in a structure surrounding the inner side of the adjacent cores, whereby the axis of the shaft coupling tube of the spaced ring portion Includes a refractive fixed jaw that suppresses movement in a direction transverse to the direction,
A part or all of the non-magnetic material is formed and disposed between the magnets along the inner circumferential surface of the rotor, further comprising a magnet spacer to space the magnets apart from each other,
The magnet spacer,
a plurality of vertical frames respectively disposed between the magnets disposed in a direction transverse to the axial direction of the shaft coupling pipe, such that the magnets and adjacent magnets in a direction transverse to the shaft direction of the shaft coupling pipe are spaced apart from each other;
It is formed extending along the inner circumferential surface of the rotor between the magnets disposed along the axial direction of the shaft coupling pipe and coupled with the vertical frames, so that adjacent magnets along the axial direction of the shaft coupling pipe are each spaced apart from each other, a horizontal frame formed thinner than the vertical frame so that a plurality of spaced spaces for accommodating leakage of the bonding material are formed between adjacent magnets along the axial direction of the shaft coupling tube; and
Doedoe extending along the inner surfaces of the magnets, the start end and the end are formed in a cylindrical shape that are connected to each other, and the vertical frame and the horizontal frame are coupled to the outer peripheral surface, so that the inner peripheral surface of the rotor, the vertical frame and the horizontal frame together with A multicopter motor comprising a plurality of magnet accommodating grooves each accommodating the magnets, and a magnet cover body closing the separation spaces. 17. The method of claim 16,
The magnets are
The inner peripheral surface of the rotor is provided with a magnetic material, the motor for a multicopter is attached to the inner peripheral surface and magnetic force of the rotor.

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