Motor device

Abstract

The present disclosure relates to an electric machine apparatus comprising: an upper electric machine assembly comprising an upper stator and an upper rotor rotatably coupled to the upper stator; and a lower electric machine assembly comprising a lower stator and a lower rotor rotatably coupled to the lower stator, wherein the upper stator of the upper electric machine assembly and the lower stator of the lower electric machine assembly share a single coil, and wherein the single coil is wound so as to twist at a boundary between the upper electric machine assembly and the lower electric machine assembly, such that current flows in opposite directions in an upper portion of the single coil in the upper electric machine assembly and in a lower portion of the single coil in the lower electric machine assembly, whereby the upper rotor of the upper electric machine assembly and the lower rotor of the lower electric machine assembly rotate in opposite directions to each other.

Description

Technical Field

[0001] The present invention relates to an electrical device in which a single coil winding is used to cause a pair of motor components to rotate simultaneously in opposite directions. Background Technology

[0002] Electric motors are components that generate power and are widely used in modern science and industry. In recent years, flight technology that uses electric motors to drive aircraft has also been applied to the field of aerial mobility vehicles.

[0003] Aircraft configured for vertical takeoff and landing (such as aerial mobility vehicles or drones) require coaxial propellers that are vertically spaced apart from each other and rotate in opposite directions to effectively generate thrust.

[0004] Therefore, conventional aircraft can be constructed with an upper and lower propeller, an upper and lower motor, and an upper and lower controller. However, the increased size of components required for conventional coaxial propellers has a negative impact on aerial mobility.

[0005] The information included in the background section of this invention is provided merely to enhance the understanding of the general background of the invention and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] Several aspects of the present invention aim to provide an electrical device in which a single coil winding is used to rotate a coaxial upper shaft and a lower shaft in opposite directions, thereby simplifying the structure of the electrical device and reducing the number of sensors and controllers mounted on the electrical device.

[0007] According to various aspects of the invention, the above and other objectives can be achieved by providing an electric motor device comprising an upper motor assembly and a lower motor assembly, wherein the upper motor assembly includes an upper stator and an upper rotor, and the lower motor assembly includes a lower stator and a lower rotor, the lower motor assembly being symmetrically arranged with respect to the upper motor assembly along the axial direction of the upper motor assembly, wherein the upper stator of the upper motor assembly and the lower stator of the lower motor assembly share a single coil, and wherein the coil is wound such that the direction of current flow in the upper portion of the coil located in the upper motor assembly is opposite to the direction of current flow in the lower portion of the coil located in the lower motor assembly, thereby causing the upper rotor of the upper motor assembly and the lower rotor of the lower motor assembly to rotate in opposite directions to each other.

[0008] The upper motor assembly may include: an upper stator with coils wound around it; an upper rotor disposed outside the upper stator; and an upper housing surrounding the upper stator and connected to the upper rotor, and the upper housing being connected to an upper shaft. The lower motor assembly may include: a lower stator with coils wound around it; a lower rotor disposed outside the lower stator; and a lower housing surrounding the lower stator and connected to the lower rotor, and the lower housing being connected to a lower shaft.

[0009] Multiple slots can be formed in the upper and lower stators, and these slots are arranged circumferentially so that the coils are wound along the slots in the upper and lower stators to twist.

[0010] The upper and lower housings can be rotatably connected to each other via bearing sections.

[0011] The coil may include an upper portion and a lower portion, wherein the upper portion includes a plurality of first inclined portions that intersect each other and extend from the intersection and a first connecting portion that connects the upper ends of the first inclined portions to each other, and the lower portion includes a plurality of second inclined portions that are respectively connected to the lower ends of the first inclined portions and intersect each other and extend from the intersection and a second connecting portion that connects the lower ends of the second inclined portions to each other.

[0012] The first and second inclined portions of the coil can extend in opposite directions.

[0013] The first and second inclined portions of the coil can be spaced apart to prevent contact between the first and second inclined portions.

[0014] Slots can be formed in the upper stator of the upper motor assembly and the lower stator of the lower motor assembly, and each slot formed in the upper stator of the upper motor assembly and the lower stator of the lower motor assembly can be configured such that the width of the slot continuously decreases toward the boundary located between the upper motor assembly and the lower motor assembly.

[0015] The methods and apparatus of the present invention have other features and advantages that will be apparent from the accompanying drawings and the following detailed description, or will be set forth in more detail in the accompanying drawings and the following detailed description, wherein the drawings are incorporated herein and, together with the detailed description, serve to explain certain principles of the invention. Attached Figure Description

[0016] Figure 1 This is an exemplary view of an electric motor device according to several exemplary embodiments of the present invention;

[0017] Figure 2 It is shown as an example Figure 1 An exploded perspective view of the motor equipment shown;

[0018] Figure 3 and Figure 4 This is a view illustrating the coil of an electric motor device according to an exemplary embodiment of the present invention; and

[0019] Figure 5 and Figure 6 This is a view illustrating the operation of an electric motor device according to an exemplary embodiment of the present invention.

[0020] It should be understood that the accompanying drawings are not necessarily drawn to scale, and present slightly simplified representations of various features illustrating the basic principles of the invention. Specific design features of the invention as included herein (including, for example, specific dimensions, orientations, positions, and shapes) will be determined in part by the specific intended application and environment of use.

[0021] In the accompanying drawings, the same reference numerals denote the same or equivalent parts of the invention throughout several figures. Detailed Implementation

[0022] Reference will now be made in detail to several embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with exemplary embodiments thereof, it should be understood that this description is not intended to limit the invention to those exemplary embodiments. On the other hand, the invention is intended to cover not only the exemplary embodiments thereof, but also various substitutions, modifications, equivalents and other embodiments that may be included within the spirit and scope of the invention as defined in the appended claims.

[0023] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Throughout the drawings, the same reference numerals are used wherever possible to denote the same or similar parts.

[0024] Hereinafter, an electric motor device according to several exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

[0025] Figure 1 The diagram illustrates, by way of example, a view of an electric motor device according to several exemplary embodiments of the present invention. Figure 2 It is shown as an example Figure 1 An exploded perspective view of the motor equipment shown. Figure 3 and Figure 4 This is a view illustrating the coil of an electric motor device according to an exemplary embodiment of the present invention. Figure 5 and Figure 6 This is a view illustrating the operation of an electric motor device according to an exemplary embodiment of the present invention.

[0026] like Figure 1 and Figure 2As shown, the motor device according to an exemplary embodiment of the present invention is configured such that the upper motor assembly 100 and the lower motor assembly 200 are arranged vertically in a symmetrical state, wherein both the upper motor assembly and the lower motor assembly include a stator and a rotor, and such that the stator of the upper motor assembly 100 and the stator of the lower motor assembly 200 share a single coil 300.

[0027] Thus, the motor device according to an exemplary embodiment of the present invention includes an upper motor assembly 100 and a lower motor assembly 200, each including a stator and a rotor, such that the upper motor assembly 100 and the lower motor assembly 200 operate independently of each other. Here, the upper motor assembly 100 and the lower motor assembly 200 are arranged symmetrically to each other, and the rotors of the upper motor assembly 100 and the lower motor assembly 200 rotate in different directions.

[0028] The stator of the upper motor assembly 100 and the stator of the lower motor assembly 200 share a single coil 300. In other words, since the single coil 300 is wound around both the upper motor assembly 100 and the lower motor assembly 200, the upper motor assembly 100 and the lower motor assembly 200 can be operated simultaneously by the current generated by the single coil 300.

[0029] The coil 300 is twisted at the boundary between the upper motor assembly 100 and the lower motor assembly 200, such that the direction of current flow in the coil portion of the upper motor assembly 100 is opposite to the direction of current flow in the coil portion of the lower motor assembly 200, thereby causing the rotors of the upper motor assembly 100 and the lower motor assembly 200 to rotate in opposite directions.

[0030] Thus, coil 300 is wound around both the stator of upper motor assembly 100 and the stator of lower motor assembly 200, such that coil 300 is twisted at the boundary between upper motor assembly 100 and lower motor assembly 200 to define an "8" shape. Therefore, coil 300 causes the direction of current flow in the coil portion of upper motor assembly 100 to be opposite to the direction of current flow in the coil portion of lower motor assembly 200. Therefore, since upper motor assembly 100 and lower motor assembly 200 are connected to a single coil 300, they operate simultaneously. Furthermore, since the directions of current flow in the upper and lower portions of coil 300 are opposite to each other, the rotors of upper motor assembly 100 and lower motor assembly 200 rotate in opposite directions.

[0031] As described above, in the motor device according to an exemplary embodiment of the present invention, the upper motor assembly 100 and the lower motor assembly 200 are constructed independently of each other and connected to a single coil 300, such that the coil 300 is twisted at the boundary between the upper motor assembly 100 and the lower motor assembly 200. Therefore, the direction of current flow in the coil portion of the upper motor assembly 100 is opposite to the direction of current flow in the coil portion of the lower motor assembly 200. Consequently, the rotors of the upper motor assembly 100 and the lower motor assembly 200 rotate simultaneously in opposite directions. Because the motor assemblies of the motor device according to an exemplary embodiment of the present invention rotate in opposite directions, the motor device is configured to effectively generate thrust during vertical takeoff and landing (e.g., in aerial mobility vehicles or drones).

[0032] The motor device according to exemplary embodiments of the present invention will now be described in more detail. For example... Figure 2 As shown, the upper motor assembly 100 includes: an upper stator 110 with coils 300 wound around it; an upper rotor 120 disposed outside the upper stator 110; and an upper housing 140 surrounding the upper stator 110 and the upper rotor 120, and the upper housing is connected to the upper shaft 130. Meanwhile, the lower motor assembly 200 includes: a lower stator 210 with coils 300 wound around it; a lower rotor 220 disposed outside the lower stator 210; and a lower housing 240 surrounding the lower stator 210 and the lower rotor 220, and the lower housing is connected to the lower shaft 230.

[0033] Here, the upper stator 110 and the lower stator 210 can be integrally formed, and the slots S in the upper stator 110 and the lower stator 210 (in which the coil 300 is housed) can be aligned with each other. The coil 300 is wound around the upper stator 110 and the lower stator 210 to twist between the upper stator and the lower stator.

[0034] The upper housing 140 is connected to the upper rotor 120 of the upper motor assembly 100. Therefore, when current flows through the coil 300, the upper rotor 120 rotates relative to the upper stator 110, and thus the upper housing 140 also rotates with the upper rotor 120. As a result, the upper shaft 130 connected to the upper housing 140 rotates, thereby causing the propeller mounted on the upper shaft 130 to rotate.

[0035] Simultaneously, the lower housing 240 is connected to the lower rotor 220 of the lower motor assembly 200. Therefore, when current flows through the coil 300, the lower rotor 220 rotates relative to the lower stator 210, and thus the lower housing 240 also rotates with the lower rotor 220. Here, since the current flowing in the coil portion wound around the lower stator 210 points in the opposite direction to the current flowing in the coil portion wound around the upper stator 110, the lower rotor 220 rotates in the opposite direction to the rotation direction of the upper rotor 120. Therefore, the lower shaft 230 connected to the lower housing 240 rotates in the opposite direction to the rotation direction of the upper shaft 130, thereby causing the propeller mounted on the lower shaft 230 to rotate in the opposite direction to the propeller mounted on the upper shaft.

[0036] Multiple slots S can be formed in both the upper stator 110 and the lower stator 210 such that these slots are arranged along the circumferential directions of the upper and lower stators, and the coil 300 can be twisted while winding along the slots S in the upper stator 110 and the lower stator 210. The slots S in the upper stator 110 and the lower stator 210 can be aligned with each other. Therefore, the coil 300 can be twisted while winding along the slots S in the upper stator 110 and the lower stator 210. Because the coil 300 twists while winding along the slots S in the upper stator 110 and the lower stator 210, the slots S in the upper stator 110 and the lower stator 210 are configured to accommodate the thickness of the coil 300.

[0037] like Figure 3 As shown, because the coil 300 twists while winding along slots S in the upper stator 110 and the lower stator 210, the coil 300 has an "8" shape. Therefore, because the current flowing in the coil portion wound around the upper stator 110 and the current flowing in the coil portion wound around the lower stator 210 are in opposite directions, the upper rotor 120 associated with the upper stator 110 and the lower rotor 220 associated with the lower stator 210 rotate in opposite directions to each other.

[0038] The upper shaft 130 and the lower shaft 230 can be arranged coaxially, and the upper rotor 120 and the upper housing 140 can be configured to have the same shape as the lower rotor 220 and the lower housing 240, respectively.

[0039] The upper housing 140 and the lower housing 240 can be rotatably connected to each other via bearing portion B, thereby allowing relative rotation between the upper and lower housings. Bearing portion B connects the upper housing 140 to the lower housing 240, allowing the upper housing 140 to rotate relative to the lower housing 240 in a rolling or sliding manner. Because the upper housing 140 and the lower housing 240 are connected to each other via bearing portion B, their enclosure is facilitated, and the upper housing 140 and the lower housing 240 can easily rotate in opposite directions.

[0040] Coil 300 will now be described. For example... Figure 4 As shown, the coil 300 may include an upper portion and a lower portion, wherein the upper portion includes a plurality of first inclined portions 310 that intersect each other and extend from the intersection and a first connecting portion 320 that connects the upper ends of the first inclined portions 310 to each other, and the lower portion includes a plurality of second inclined portions 330 that intersect each other and then extend from the intersection and a second connecting portion 340 that connects the lower ends of the second inclined portions 330 to each other.

[0041] Thus, the upper portion of the coil 300 includes a first inclined portion 310 and a first connecting portion 320, and the lower portion of the coil 300 includes a second inclined portion 330 and a second connecting portion 340. Because a pair of first inclined portions 310 intersect each other and extend from the intersection, and a pair of second inclined portions 330 connected to the pair of first inclined portions 310 also intersect each other and extend from the intersection, the coil 300 has a twisted shape. Here, the pair of first inclined portions 310 are connected to each other via the first connecting portion 320, and the pair of second inclined portions 330 are connected to each other via the second connecting portion 340.

[0042] Therefore, each slot S formed in the stator of the upper motor assembly 100 and the stator of the lower motor assembly 200 can be configured such that the width of the slot continuously decreases toward the boundary located between the upper motor assembly 100 and the lower motor assembly 200. Thus, when the coil 300 is wound in the slot S in the upper motor assembly 100 and the lower motor assembly 200, the first inclined portion 310 and the second inclined portion 330 can extend obliquely along the slot S. Therefore, when the coil 300 is wound around the stator of the upper motor assembly 100 and the stator of the lower motor assembly 200, the coil 300 can be smoothly twisted at the boundary between the upper motor assembly 100 and the lower motor assembly 200, and the increase in the thickness of the coil 300 due to the winding of the coil 300 can be reduced.

[0043] Multiple extension wires extending from the first connection portion 320 or the second connection portion 340 are wound around the stators of the upper motor assembly 100 and the lower motor assembly 200 in the circumferential direction of the stators of the upper and lower motor assemblies. When the motor device is implemented by a three-phase motor, the wires corresponding to the U-phase, V-phase, and W-phase can be wound around the corresponding stators of the upper motor assembly 100 and the lower motor assembly 200. Therefore, the coil 300 may include multiple wires wound around the stators of the upper motor assembly 100 and the lower motor assembly 200, and the direction of extension of the coil 300 may be reversed at each slot S in the stator.

[0044] Therefore, the first inclined portion 310 and the second inclined portion 330, which are connected to each other, can extend in opposite directions. Because the coil 300 is twisted at the boundary between the upper motor assembly 100 and the lower motor assembly 200, the distance between the pair of first inclined portions 310 and the distance between the pair of second inclined portions 330 gradually decreases towards the boundary between the upper motor assembly 100 and the lower motor assembly 200. The inclination directions of the first inclined portion 310 and the second inclined portion 330 are reversed at the twisted position. Therefore, the coil 300 is twisted into an "8" shape, and the current in the upper motor assembly 100 and the current in the lower motor assembly 200 can flow in opposite directions.

[0045] The first inclined portion 310 and the second inclined portion 330 of the coil 300 can extend apart from each other. Because the first inclined portion 310 and the second inclined portion 330 do not contact each other when the coil 300 is wound around the stator of the upper motor assembly 100 and the stator of the lower motor assembly 200, there is no risk of short circuit in the wires.

[0046] In the following, the flow of current in the coil 300 according to an exemplary embodiment of the present invention will be described.

[0047] Figure 5 The diagram shows an exemplary view of the coil 300 of the upper motor assembly 100. Figure 6 The diagram shows an exemplary view of the coil 300 of the lower motor assembly 200.

[0048] Reference Figure 4 Because coil 300 is twisted into the shape of an "8", the current in the upper part of coil 300 flows counterclockwise, while the current in the lower part of coil 300 flows clockwise.

[0049] Therefore, as Figure 5 As shown, because the current flows counterclockwise in the coil 300 of the upper motor assembly 100, the upper rotor 120 rotates to the right.

[0050] At the same time, such as Figure 6 As shown, because the current flows clockwise in the coil 300 of the lower motor assembly 200, the lower rotor 220 rotates to the left.

[0051] As described above, the motor device according to an exemplary embodiment of the present invention is configured such that an upper motor assembly 100, including a stator and a rotor, and a lower motor assembly 200, including a stator and a rotor, share a single coil 300 while being symmetrically arranged, and the coil 300 is wound in a torsional manner. Therefore, the rotor of the upper motor assembly 100 and the rotor of the lower motor assembly 200 rotate simultaneously in opposite directions.

[0052] As is apparent from the above description, various aspects of the present invention are intended to provide an electrical device in which a single coil winding is used to rotate a coaxial upper shaft and a lower shaft in opposite directions, thereby simplifying the structure of the electrical device and reducing the number of sensors and controllers to be mounted on the electrical device.

[0053] For ease of interpretation and precise definition in the appended claims, the terms “upper,” “lower,” “inner,” “outer,” “up,” “lower,” “upward,” “downward,” “front,” “rear,” “rear,” “inner side,” “outer side,” “inward,” “outer,” “internal,” “external,” “inner,” “outer,” “forward,” and “backward” are used to describe features of exemplary embodiments with reference to the positions of these features shown in the accompanying drawings. Furthermore, it should be understood that the term “connection” or its derivatives refer to both direct and indirect connections.

[0054] The foregoing description of specific exemplary embodiments of the invention has been presented for purposes of illustration and description. These descriptions are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and many modifications and variations will be apparent from the foregoing teachings. Exemplary embodiments were chosen and described to explain certain principles of the invention and its practical application, enabling others skilled in the art to make and utilize various exemplary embodiments of the invention, as well as various alternatives and modifications thereof. The scope of the invention is intended to be defined by the appended claims and their equivalents.

Claims

1. An electric motor device, comprising: An upper motor assembly includes an upper stator and an upper rotor rotatably connected to the upper stator; as well as The lower motor assembly includes a lower stator and a lower rotor rotatably connected to the lower stator. In this configuration, the upper stator of the upper motor assembly and the lower stator of the lower motor assembly share a single coil. The individual coil is wound in a twisted manner at the boundary between the upper motor assembly and the lower motor assembly, such that the direction of current flow in the upper portion of the individual coil in the upper motor assembly is opposite to the direction of current flow in the lower portion of the individual coil in the lower motor assembly, thereby causing the upper rotor of the upper motor assembly and the lower rotor of the lower motor assembly to rotate in opposite directions. The upper portion of the single coil includes a plurality of first inclined portions that intersect each other and extend from the intersection, and a first connecting portion that connects the upper ends of these first inclined portions to each other. The lower portion of the single coil includes a plurality of second inclined portions that intersect each other and extend from the intersection, and a second connecting portion that connects the lower ends of these second inclined portions to each other, wherein the second inclined portions are respectively connected to the lower ends of the first inclined portions. The first inclined portion, the first connecting portion, the second inclined portion, and the second connecting portion form the shape of an "8".

2. The motor device according to claim 1, wherein, The lower motor assembly is symmetrically aligned with the upper motor assembly in the axial direction.

3. The motor device according to claim 1, in, The upper rotor is positioned outside the upper stator around which the single coil is wound. The upper motor assembly further includes an upper housing, which surrounds the upper stator and is connected to the upper rotor, and is also connected to the upper shaft. The lower rotor is disposed outside the lower stator, around which the single coil is wound, and The lower motor assembly further includes a lower housing, which surrounds the lower stator and is connected to the lower rotor, and the lower housing is connected to the lower shaft.

4. The motor device according to claim 3, wherein, Grooves are formed in the upper stator and the lower stator, and these grooves are arranged along the circumferential direction of the upper stator and the lower stator, such that the individual coil is wound along these grooves in the upper stator and the lower stator to be twisted.

5. The motor device according to claim 3, wherein, The upper housing and the lower housing are rotatably connected to each other via bearing portions.

6. The motor device according to claim 1, wherein, The first inclined portion and the second inclined portion of the single coil extend in opposite directions.

7. The motor device according to claim 1, wherein, The first and second inclined portions of the single coil are spaced apart from each other to prevent contact between the first and second inclined portions.

8. The motor device according to claim 4, wherein, The first inclined portion and the second inclined portion extend obliquely along the groove to intersect each other.

9. The motor device according to claim 1, wherein, The upper and lower portions of the single coil twist at the boundary between the upper and lower motor assemblies, and the distance between a pair of first inclined portions and the distance between a pair of second inclined portions decrease toward the boundary between the upper and lower motor assemblies.

10. The motor device according to claim 4, in, The slots are formed in the upper stator of the upper motor assembly and the lower stator of the lower motor assembly, and The width of each slot formed in the upper stator of the upper motor assembly and the lower stator of the lower motor assembly decreases continuously toward the boundary between the upper motor assembly and the lower motor assembly.

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