Motor device

Abstract

To provide a motor apparatus in which a structure is simplified because coaxial shafts are rotatably operated in opposite directions with a single coil wire, whereby the number of sensors and controllers is reduced.SOLUTION: An upper motor assembly and a lower motor assembly each including a stator and a rotor are disposed so as to be rotated oppositely in the up-down direction. The respective stators of the upper motor assembly and the lower motor assembly share a single coil. The coil is formed so as to be twisted at the boundary point where the upper motor assembly and the lower motor assembly are divided. The direction of current flowing through a coil portion of the upper motor assembly is opposite to the direction of current flowing through a coil portion of the lower motor assembly. The respective rotors of the upper motor assembly and the lower motor assembly are rotated in opposite directions.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a motor arrangement in which the motor rotates in different directions simultaneously using a single coil winding. [Background technology]

[0002] Motors are a very common power source element in the current technology industry, and recently, electric motor-driven flying technology has been applied to air mobility.

[0003] In particular, in the case of aircraft that perform vertical takeoff and landing, such as air mobility or drones, the operation of coaxially counter-rotating propellers on the upper and lower sides is required to generate effective thrust.

[0004] For this reason, it was necessary to have a propeller, motor, and controller on the top and bottom in the past. However, as the number of parts required to configure the coaxial contra-rotating propellers increased, the weight also increased, which was a disadvantage in terms of air mobility.

[0005] The matters described above as the background art are intended solely to enhance understanding of the background of the present invention, and should not be construed as an admission that they correspond to prior art already known to those of ordinary skill in the art. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent Publication No. 10-2020-0131767A Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been proposed to solve these problems, and its object is to provide a motor device in which the structure is simplified and the number of sensors and controllers required is reduced by using a single coil winding to rotate coaxial rotating shafts in opposite directions. [Means for solving the problem]

[0008] In order to achieve the above object, in the motor device according to the present invention, an upper motor assembly and a lower motor assembly, each including a stator and a rotor, are arranged so as to be inverted from each other in the vertical direction, and each stator of the upper motor assembly and the lower motor assembly shares a single coil, and the coil is formed so as to be twisted at the point where the upper motor assembly and the lower motor assembly are divided, so that the directions of current flowing in the coil portion of the upper motor assembly and the coil portion of the lower motor assembly are opposite to each other, and the rotors of the upper motor assembly and the lower motor assembly rotate in opposite directions to each other.

[0009] The upper motor assembly may include an upper stator around which a coil is wound, an upper rotor provided on the outside of the upper stator, and an upper housing that surrounds the upper stator and the upper rotor and is connected to an upper shaft, and the lower motor assembly may include a lower stator around which a coil is wound, a lower rotor provided on the outside of the lower stator, and a lower housing that surrounds the lower stator and the lower rotor and is connected to a lower shaft.

[0010] The upper stator and the lower stator may each have slots aligned in the circumferential direction, and the coils may be wound in a twisted manner in the slots of the upper stator and the slots of the lower stator.

[0011] The upper and lower housings may be connected to each other via a bearing portion so as to be capable of relative rotation.

[0012] The coil may have an upper part formed by a plurality of first inclined portions extending while intersecting each other and a first connecting part connecting the upper ends of each of the first inclined portions, and a lower part formed by a plurality of second inclined portions each connected to the lower ends of the first inclined portions and extending while intersecting each other and a second connecting part connecting the lower ends of each of the second inclined portions.

[0013] The coil may have a first inclined portion and a second inclined portion that are connected to each other and extend in opposite directions.

[0014] The coil may extend apart such that the respective first and second angled portions do not contact each other.

[0015] A slot may be formed in each stator of the upper motor assembly and the lower motor assembly, and each slot may be formed to have a width that gradually decreases toward a point where the upper motor assembly and the lower motor assembly are separated. Effect of the Invention

[0016] In the motor device having the above-described structure, the coaxial shafts rotate in opposite directions using a single coil winding, thereby simplifying the structure and reducing the number of sensors and controllers required. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 shows a motor arrangement according to the present invention. [Diagram 2] FIG. 2 is an exploded perspective view of the motor device shown in FIG. [Diagram 3] FIG. 2 is a diagram for explaining a coil according to the present invention. [Figure 4] FIG. 2 is a diagram for explaining a coil according to the present invention. [Diagram 5] 5A to 5C are diagrams illustrating the operation of the motor device of the present invention. [Figure 6] 5A to 5C are diagrams illustrating the operation of the motor device of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A motor device according to a preferred embodiment of the present invention will now be described with reference to the accompanying drawings.

[0019] FIG. 1 is a diagram showing a motor device according to the present invention, FIG. 2 is an exploded perspective view of the motor device shown in FIG. 1, FIGS. 3 and 4 are diagrams for explaining a coil according to the present invention, and FIGS. 5 and 6 are diagrams for explaining the operation of the motor device according to the present invention.

[0020] As shown in Figures 1 and 2, in the motor device according to the present invention, an upper motor assembly 100 and a lower motor assembly 200, each including a stator and a rotor, are arranged in an inverted manner on the upper and lower sides, and each stator of the upper motor assembly 100 and the lower motor assembly 200 shares a single coil 300.

[0021] As described above, the present invention is divided into an upper motor assembly 100 and a lower motor assembly 200 each including a stator and a rotor, and the upper motor assembly 100 and the lower motor assembly 200 operate independently. Here, the upper motor assembly 100 and the lower motor assembly 200 are arranged in an inverted manner, and the rotor of the upper motor assembly 100 and the rotor of the lower motor assembly 200 rotate in different directions.

[0022] In particular, the stators of the upper motor assembly 100 and the lower motor assembly 200 share a single coil 300. That is, a single coil 300 is wound on both the upper motor assembly 100 and the lower motor assembly 200, allowing the upper motor assembly 100 and the lower motor assembly 200 to operate simultaneously by current flowing through the single coil 300.

[0023] The coil 300 is twisted at the point where the upper motor assembly 100 and the lower motor assembly 200 are separated, so that the currents flowing in the coil portion of the upper motor assembly 100 and the coil portion of the lower motor assembly 200 are in opposite directions, causing the rotors of the upper motor assembly 100 and the lower motor assembly 200 to rotate in opposite directions.

[0024] In this manner, the coil 300 is wound around both the stators of the upper motor assembly 100 and the lower motor assembly 200, and is twisted at the point where the upper motor assembly 100 and the lower motor assembly 200 are divided to form an '8' shape. As a result, the coil 300 has opposite currents flowing through the coil portion of the upper motor assembly 100 and the coil portion of the lower motor assembly 200. As a result, the upper motor assembly 100 and the lower motor assembly 200 operate simultaneously by being connected to the single coil 300, and the direction of current flowing through the coil 300 is opposite, causing each rotor to rotate in the opposite direction.

[0025] In this manner, in the present invention, the upper motor assembly 100 and the lower motor assembly 200 are respectively configured, a single coil 300 is connected, and the coil 300 is wound in a twisted manner, so that the directions of current flowing through the coil portion of the upper motor assembly 100 and the coil portion of the lower motor assembly 200 are opposite to each other. As a result, the rotor of the upper motor assembly 100 and the rotor of the lower motor assembly 200 rotate simultaneously in opposite directions to each other. In this manner, in the present invention, the motor rotates in both directions, so that a propulsive force can be efficiently generated when a vertical takeoff and landing operation is realized, such as in air mobility or a drone.

[0026] 2, the upper motor assembly 100 includes an upper stator 110 around which the coil 300 is wound, an upper rotor 120 provided on the outside of the upper stator 110, and an upper housing 140 surrounding the upper stator 110 and the upper rotor 120 and to which the upper shaft 130 is coupled. The lower motor assembly 200 includes a lower stator 210 around which the coil 300 is wound, a lower rotor 220 provided on the outside of the lower stator 210, and a lower housing 240 surrounding the lower stator 210 and the lower rotor 220 and to which the lower shaft 230 is coupled.

[0027] Here, the upper stator 110 and the lower stator 210 may be integrally configured, and the slots S in which the coils 300 are positioned may be formed on the same line in the upper stator 110 and the lower stator 210. The coils 300 are wound around the upper stator 110 and the lower stator 210 in a twisted manner.

[0028] Meanwhile, the upper housing 140 is coupled to the upper rotor 120 of the upper motor assembly 100, and when a current flows through the coil 300, the upper rotor 120 rotates relative to the upper stator 110, causing the upper housing 140 to rotate together with the upper rotor 120. As a result, the upper shaft 130 coupled to the upper housing 140 rotates, and the propeller attached to the upper shaft 130 can rotate.

[0029] In addition, a lower housing 240 is coupled to the lower rotor 220 of the lower motor assembly 200, and when a current flows through the coil 300, the lower rotor 220 rotates relative to the lower stator 210, causing the lower housing 240 to rotate together with the lower rotor 220. However, since the coil 300 is twisted and the coil portion wound around the lower stator 210 has a current flow in the opposite direction to the coil portion wound around the upper stator 110, the lower rotor 220 rotates in the opposite direction to the upper rotor 120. As a result, the lower shaft 230 coupled to the lower housing 240 rotates in the opposite direction to the upper shaft 130, and the propeller attached to the lower shaft 230 can rotate.

[0030] In detail, the upper stator 110 and the lower stator 210 each have slots S formed side by side in the circumferential direction, and the coil 300 can be wound while being twisted around the slots S of the upper stator 110 and the slots S of the lower stator 210. The slots S of the upper stator 110 and the slots S of the lower stator 210 can be formed on the same line. As a result, the coil 300 can be wound while being twisted around the slots S of the upper stator 110 and the slots S of the lower stator 210. In addition, since the coil 300 is twisted, the slots S of the upper stator 110 and the slots S of the lower stator 210 can be shaped to accommodate the width of the coil 300 to be wound.

[0031] 3, the coil 300 is wound in a twisted manner around the slots S of the upper stator 110 and the slots S of the lower stator 210, forming an '8' shape. As a result, the current direction of the coil 300 is opposite between the part wound around the upper stator 110 and the part wound around the lower stator 210, so that the rotation direction of the upper rotor 120 matching with the upper stator 110 and the rotation direction of the lower rotor 220 matching with the lower stator 210 are opposite to each other.

[0032] Also, the upper shaft 130 and the lower shaft 230 may be provided coaxially, and the upper rotor 120 and the lower rotor 220, and the upper housing 140 and the lower housing 240 may be formed to have the same shape, respectively.

[0033] In addition, the upper housing 140 and the lower housing 240 may be connected to be relatively rotatable via a bearing part B. The bearing part B connects the upper housing 140 and the lower housing 240 and allows them to rotate relative to each other, allowing the upper housing 140 and the lower housing 240 to rotate relative to each other by rolling or slipping. As such, since the upper housing 140 and the lower housing 240 are connected to each other via the bearing part B, packaging is easy, and the upper housing 140 and the lower housing 240 can smoothly rotate in opposite directions.

[0034] To explain the coil 300 of the present invention in more detail, as shown in FIG. 4, the coil 300 may have an upper portion formed by a plurality of first inclined portions 310 extending while crossing each other and a first connecting portion 320 connecting the upper ends of each first inclined portion 310, and a lower portion formed by a plurality of second inclined portions 330 respectively connected to the lower ends of the first inclined portions 310 and extending while crossing each other and a second connecting portion 340 connecting the lower ends of each second inclined portion 330.

[0035] In this manner, the coil 300 has an upper portion composed of the first inclined portion 310 and the first connecting portion 320, and a lower portion composed of the second inclined portion 330 and the second connecting portion 340. In particular, the coil 300 has a twisted shape as the pair of first inclined portions 310 extend while crossing each other, and the pair of second inclined portions 330 connected to the pair of first inclined portions 310 also extend while crossing each other. Here, the pair of first inclined portions 310 are connected via the first connecting portion 320, and the pair of second inclined portions 330 are connected via the second connecting portion 340.

[0036] For this, the slots S formed in each stator of the upper motor assembly 100 and the lower motor assembly 200 may be formed to have a width that gradually decreases toward the point where the upper motor assembly 100 and the lower motor assembly 200 are divided. As a result, when the coil 300 is wound around the slots S formed in each stator of the upper motor assembly 100 and the lower motor assembly 200, the first inclined portion 310 and the second inclined portion 330 may be wound while extending obliquely along the shape of the slot S. As a result, when the coil 300 is wound around the stators of the upper motor assembly 100 and the lower motor assembly 200, the coil 300 may be naturally twisted at the point where the upper motor assembly 100 and the lower motor assembly 200 are divided, and an increase in thickness due to the coil 300 being wound may be reduced.

[0037] Meanwhile, an extension wire may be connected to the first connecting portion 320 or the second connecting portion 340 of the coil 300 so as to be wound in the circumferential direction of each stator of the upper motor assembly 100 and the lower motor assembly 200. In addition, when the motor device is a three-phase motor, wires corresponding to U, V, and W phases may be wound on each stator of the upper motor assembly 100 and the lower motor assembly 200. Thus, the coil 300 may be made up of a number of wires wound on the stators of the upper motor assembly 100 and the lower motor assembly 200, and extend such that the winding directions are reversed with respect to the slots S of each stator.

[0038] As a result, the coil 300 may have the first inclined portion 310 and the second inclined portion 330 connected to each other extending in opposite directions. That is, the coil 300 is twisted at the point where the upper motor assembly 100 and the lower motor assembly 200 are separated, so that the widths of the first inclined portion 310 and the second inclined portion 330 become gradually smaller toward the point where the upper motor assembly 100 and the lower motor assembly 200 are separated. Also, the inclination direction of the first inclined portion 310 and the second inclined portion 330 connected to each other is reversed at the twisted position. As a result, the coil 300 may be twisted in an '8' shape, so that the current direction in the upper motor assembly 100 and the current direction in the lower motor assembly 200 may be configured to be opposite.

[0039] In particular, the coil 300 may extend with a distance between the first and second inclined portions 310 and 330 so that they do not come into contact with each other. In this manner, when the coil 300 is wound around each stator of the upper motor assembly 100 and the lower motor assembly 200, the first and second inclined portions 310 and 330 do not come into contact with each other, so that problems due to electrical short circuits do not occur.

[0040] The flow of current due to the shape of the coil 300 of the present invention will be described below.

[0041] FIG. 5 is a diagram showing the coil 300 portion of the upper motor assembly 100, and FIG. 6 is a diagram showing the coil 300 portion of the lower motor assembly 200. As shown in FIG.

[0042] Referring now to FIG. 4, the coil 300 is twisted in an '8' shape, so that the current flowing through the coil 300 flows counterclockwise at the upper portion and clockwise at the lower portion.

[0043] As a result, as shown in FIG. 5, in the upper motor assembly 100, the current flows in the coil 300 in a counterclockwise direction, causing the rotor to rotate in a rightward direction.

[0044] Meanwhile, as shown in FIG. 6, in the lower motor assembly 200, the current flows in the coil 300 in a clockwise direction, so that the rotor rotates in a left direction.

[0045] In this manner, in the present invention, the upper motor assembly 100 and the lower motor assembly 200, each including a stator and a rotor, are arranged in an inverted manner on the top and bottom sides and share a single coil 300, which is formed so that the coil 300 is twisted, so that the rotors of the upper motor assembly 100 and the lower motor assembly 200 simultaneously rotate in opposite directions.

[0046] In this manner, the present invention allows the coaxial shafts to rotate in opposite directions by the winding of a single coil 300, thereby simplifying the structure and reducing the number of sensors and controllers required.

[0047] While particular embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various modifications and variations of the present invention can be made without departing from the spirit and scope of the present invention as defined by the following claims. [Explanation of symbols]

[0048] 100 Upper motor assembly 110 Upper stator 120 Upper Rotor 130 Upper Shaft 140 Upper housing 200 Lower Motor Assembly 210 Lower Stator 220 Lower Rotor 230 Lower Shaft 240 Lower Housing 300 coils 310 1st slope section 320 1st connection part 330 2nd slope part 340 2nd connection part

Claims

1. An upper motor assembly and a lower motor assembly each including a stator and a rotor are arranged so as to be inverted with respect to each other in the vertical direction, Each stator of the upper motor assembly and the lower motor assembly shares a single coil; The coils are formed so as to be twisted at a point where the upper motor assembly and the lower motor assembly are separated, and the directions of current flowing through the coil portions of the upper motor assembly and the coil portions of the lower motor assembly are opposite to each other, so that the rotors of the upper motor assembly and the lower motor assembly rotate in opposite directions to each other.

2. The upper motor assembly includes an upper stator around which a coil is wound, an upper rotor provided on the outside of the upper stator, and an upper housing that surrounds the upper stator and the upper rotor and to which the upper shaft is coupled, 2. The motor device according to claim 1, wherein the lower motor assembly includes a lower stator around which a coil is wound, a lower rotor provided on the outside of the lower stator, and a lower housing surrounding the lower stator and the lower rotor and to which the lower shaft is coupled.

3. 3. The motor device according to claim 2, wherein the upper stator and the lower stator have slots arranged side by side in the circumferential direction, and the coils are wound in a twisted manner in the slots of the upper stator and the slots of the lower stator.

4. 3. The motor device according to claim 2, wherein the upper housing and the lower housing are connected to each other via a bearing portion so as to be capable of rotating relative to each other.

5. 2. The motor device according to claim 1, wherein the coil has an upper portion formed of a plurality of first inclined portions extending while intersecting each other and a first connecting portion connecting the upper ends of each of the first inclined portions, and a lower portion formed of a plurality of second inclined portions each connected to the lower ends of the first inclined portions and extending while intersecting each other and a second connecting portion connecting the lower ends of each of the second inclined portions.

6. The motor device according to claim 5 , wherein the coil has a first inclined portion and a second inclined portion that are connected to each other and extend in opposite directions.

7. 6. The motor device according to claim 5, wherein the coils each extend so that the first inclined portion and the second inclined portion are spaced apart from each other so as not to contact each other.

8. Each stator of the upper motor assembly and the lower motor assembly is formed with a slot; 2. The motor device according to claim 1, wherein each slot is gradually narrowed toward a point where the upper motor assembly and the lower motor assembly are separated.

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