Motor assembly and cable transmission device including same

Abstract

A motor assembly is disclosed. The motor assembly according to an embodiment includes: a motor housing; a stator disposed inside the motor housing; a rotor disposed inside the motor housing and configured to rotate by a current applied to the stator; a shaft penetrating the motor housing in a first axial direction and connected to the rotor so as to rotate; an impeller housing having an inlet and an outlet formed therein; and an impeller disposed in the impeller housing and configured to rotate by power such that air flows through the impeller housing. The motor housing and the impeller housing may communicate with each other.

Description

Motor assembly and cable transmission device including the same

[0001] The description below is about a motor assembly, and is about a motor assembly having a structure capable of self-cooling.

[0002] Power cables used for power transmission and distribution are installed using steel towers erected at regular intervals above ground or underground utility tunnels. Meanwhile, when power cables are to be installed across wide rivers, streams, or the sea, they are laid on bridges constructed to cross the water.

[0003] In general, in order to install power cables on bridges and the like, the power cables are pulled out from cable drums on which the cables are wound and pulled out to the installation locations installed on the bridge. To raise the pulled out power cables, installation scaffolding erected from the ground to the bridge and a plurality of caterpillars installed along the length of the bridge and supporting the power cables so that they can be transmitted may be used. Meanwhile, caterpillars support the outer surface of the cables and operate to transmit the cables in one direction. However, conventional caterpillars are heavy, making installation difficult and difficult to place in narrow spaces. Therefore, technology is required to ensure work stability and work convenience.

[0004] Considering this, a cable transmission device is needed to stably support the cable while transmitting it to the target location. In this regard, Patent Publication No. 10-2021-0143472 discloses an invention for a transmission device for power cables.

[0005] The background technology described above is something that the inventor possessed or acquired in the process of deriving the disclosure of the present application, and cannot necessarily be said to be a publicly known technology disclosed to the general public prior to the present application.

[0006] An object of one embodiment is to provide a motor assembly and a cable transmission device including the same, which can increase cooling efficiency by flowing air inside during a driving process.

[0007] An object of one embodiment is to provide a motor assembly capable of self-cooling by circulating air inside through its own power and a cable transmission device including the same.

[0008] According to one embodiment, a motor assembly may include a motor housing; a stator disposed inside the motor housing; a rotor disposed inside the motor housing and configured to rotate by a current applied to the stator; a shaft penetrating the motor housing in a first axial direction and connected to the rotor to rotate; an impeller housing having an inlet and an outlet formed therein; and an impeller disposed inside the impeller housing, configured to rotate by power, and configured to flow air through the impeller housing. In one embodiment, the motor housing and the impeller housing may be connected to each other.

[0009] In one embodiment, the motor housing may include an air injection hole formed on an outer surface for introducing air into the interior of the motor housing; and an air exhaust hole formed on an outer surface for exhausting air from the interior of the motor housing. In one embodiment, the air injection hole of the motor housing may be in communication with an outlet of the impeller housing.

[0010] In one embodiment, the motor assembly may further include a connecting tube for flowing air between the air inlet hole of the motor housing and the exposure opening of the impeller housing.

[0011] In one embodiment, the motor housing may include a first surface facing the first axial direction and having a shaft extending outwardly; a second surface facing a second axial direction opposite to the first axial direction; and a side surface surrounding the first surface and the second surface with the first axial direction as the center. In one embodiment, one or more air exhaust holes may be formed in the second surface. In one embodiment, an air injection hole may be formed in either the first surface or the side surface.

[0012] In one embodiment, the air injection hole is formed on the side surface, and the air injection hole may be closer to the first surface than the stator.

[0013] In one embodiment, the impeller housing is disposed on a second surface of the motor housing, and the impeller is rotatable in conjunction with the shaft.

[0014] In one embodiment, the shaft may include a first extension portion extending to protrude outward from the first surface; and a second extension portion exposed to the second surface. In one embodiment, the impeller may be connected to the second extension portion.

[0015] In one embodiment, when viewed from the second side, the plurality of air exhaust holes and the impeller housing may be non-overlapping.

[0016] In one embodiment, a cable sending device may include a support plate including a front side and a rear side; a pair of power balls arranged on the front side of the support plate, the power balls rotating in opposite directions around a pair of axes perpendicular to the front side and parallel to each other to send out a cable; and a motor assembly for transmitting power to at least one of the pair of power balls. In one embodiment, the motor assembly may include a motor housing having an air inlet hole and an air outlet hole formed therein; a stator arranged inside the motor housing; a rotor arranged inside the motor housing and rotating by a current applied to the stator; a shaft penetrating the motor housing in a first axial direction and connected to the rotor and rotating; an impeller housing having an inlet hole and an outlet hole formed therein; an impeller arranged inside the impeller housing, rotating by power and causing air to flow through the impeller housing; and a connecting tube connecting the motor housing and the impeller housing and communicating the outlet hole and the air inlet hole.

[0017] In one embodiment, the shaft may be exposed to the outside of the motor housing in a second axial direction opposite to the first axial direction. In one embodiment, the impeller may be connected to the shaft exposed in the second axial direction and may rotate in conjunction with the rotation of the shaft.

[0018] A motor assembly according to one embodiment can have stable and effective heat dissipation efficiency by circulating air inside through its own power during operation.

[0019] A cable transmission device according to one embodiment can have continuous and stable operating efficiency by including a motor assembly capable of self-heating.

[0020] Aspects, features and advantages of embodiments of the present disclosure will become more apparent with reference to the drawings below.

[0021] Figure 1 is a perspective view of a cable transmission device according to one embodiment.

[0022] Figure 2 is a perspective view of a motor assembly according to one embodiment.

[0023] FIG. 3 is a perspective view showing an assembled state of a motor assembly according to one embodiment.

[0024] FIG. 4 is a drawing illustrating the internal structure of a motor assembly according to one embodiment.

[0025] Figure 5 is a bottom view of a motor assembly according to one embodiment.

[0026] Figure 6 is a cross-sectional view of a motor assembly according to one embodiment.

[0027] Hereinafter, embodiments are described in detail with reference to the attached drawings. However, the embodiments may be modified in various ways, and the scope of the patent application is not limited or restricted by these embodiments. It should be understood that all modifications, equivalents, or alternatives to the embodiments are included within the scope of the patent application.

[0028] The terms used in the examples are for the purpose of explanation only and should not be construed as limiting. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, the terms "comprises" or "has" and the like are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but should be understood to not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0029] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments pertain. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0030] In addition, when describing with reference to the attached drawings, identical components will be assigned the same reference numerals regardless of the drawing numbers, and redundant descriptions thereof will be omitted. When describing embodiments, if a detailed description of a related known technology is judged to unnecessarily obscure the gist of the embodiment, the detailed description will be omitted.

[0031] Additionally, terms such as first, second, A, B, (a), (b), etc. may be used to describe components of the embodiments. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by the terms. When a component is described as being "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but another component may also be "connected," "coupled," or "connected" between each component.

[0032] Components included in one embodiment and components with common functions will be described using the same names in other embodiments. Unless otherwise stated, the descriptions given in one embodiment may also apply to other embodiments, and detailed descriptions will be omitted to the extent of overlap.

[0033] Figure 1 is a perspective view of a cable transmission device according to one embodiment.

[0034] Referring to FIG. 1, a cable sending device (21) according to one embodiment can be used to send out a cable (W) in one direction. For example, the cable sending device (21) can be used to pull and extract a cable (W) wound on a drum (not shown) in one direction (e.g., +Y direction in FIG. 1) by applying an external force while supporting the outer surface of the cable (W). In one embodiment, the cable sending device (21) can include a support plate (210), a pair of power balls (211, 212), and a motor assembly (1).

[0035] In one embodiment, a power ball and a driving motor may be installed on the support plate (210). In one embodiment, the support plate (210) may be formed in a plate shape and may include a front side (e.g., a side facing the +Z direction of FIG. 1) and a rear side (e.g., a side facing the -Z direction of FIG. 1) that are opposite to each other. In one embodiment, a pair of power balls (211, 212) may be rotatably arranged on the front side of the support plate (210). In one embodiment, a position adjusting part (not shown) for adjusting the gap between the pair of power balls (211, 212) may be arranged on the rear side of the support plate (210). In one embodiment, the motor assembly (1) may be arranged on the rear side of the support plate (210) as illustrated in FIG. 1, but is not limited thereto, and the installation location of the motor assembly (1) is not particularly limited as long as it can transmit power to the power balls.

[0036] In one embodiment, a pair of power balls (211, 212) may be installed on a support plate (210) so as to be rotatable about a pair of axes that are parallel to each other. In one embodiment, the pair of power balls (211, 212) may be composed of a first power ball (211) that rotates in a first direction (R1) about a first axis (A1) and a second power ball (212) that rotates in a second direction (R2) opposite to the first direction (R1) about a second axis (A2). In one embodiment, the first axis (A1) and the second axis (A2) may be perpendicular to the front surface of the support plate (210) and may be parallel to each other. In one embodiment, the cable (W) is supported by being sandwiched between the outer surfaces of a pair of power balls (211, 212), and can be transmitted in one direction while receiving a constant tension by the rotation of the pair of power balls (211, 212).

[0037] In one embodiment, the pair of power balls (211, 212) may have an outer surface formed of a rubber material or may include a rubber member. Since the pair of power balls (211, 212) move the cable (W) through frictional force while the outer surface is in direct contact with the cable, the inclusion of a material with high frictional force may improve the grounding force for the cable. In one embodiment, the pair of power balls (211, 212) may have substantially the same size. In one embodiment, the gap between the pair of power balls (211, 212) may be adjustable. A description thereof will be omitted.

[0038] In one embodiment, the motor assembly (1) can transmit power to at least one of a pair of power balls (211, 212). In one embodiment, the motor assemblies (1) are provided as a pair and can drive the first power ball and the second power ball respectively, but as illustrated in the drawing, the output of one motor assembly (1) can be simultaneously applied to the first power ball (211) and the second power ball (212) to rotate the pair of power balls (211, 212) simultaneously. In one embodiment, the motor assembly (1) can transmit power so that the pair of power balls (211, 212) rotate in a synchronized state. In one embodiment, the output provided by the motor assembly (1) can vary depending on the operation.

[0039] In one embodiment, the motor assembly (1) can dissipate heat generated during operation to the outside through self-cooling. For example, the motor assembly (1) can perform a self-heating function by circulating air internally through a portion of the output generated during operation.

[0040] FIG. 2 is a perspective view of a motor assembly according to one embodiment. FIG. 3 is a perspective view showing an assembled state of a motor assembly according to one embodiment. FIG. 4 is a drawing showing the internal structure of a motor assembly according to one embodiment. FIG. 5 is a bottom view of a motor assembly according to one embodiment. FIG. 6 is a cross-sectional view of a motor assembly according to one embodiment.

[0041] Referring to FIGS. 2 to 6, a motor assembly (1) according to one embodiment may include a motor unit (110) that receives power and generates rotational force, a cooling unit (120) that cools the motor unit (110) through the output of the motor unit (110), and a connecting tube (130).

[0042] In one embodiment, the motor unit (110) may include a motor housing (111), a stator (116), a rotor (115), and a shaft (112). In one embodiment, the motor unit (110) may be provided in a brushless DC motor (BLDC motor) structure.

[0043] In one embodiment, the motor housing (111) may form the exterior of the motor unit (110). An internal space may be formed inside the motor housing (111). In one embodiment, the motor housing (111) may include a first side, a second side, and a side surface.

[0044] In one embodiment, a first surface of the motor housing (111) may face a first axis direction (e.g., +Z direction of FIG. 3). A second surface of the motor housing (111) may face a second axis direction opposite to the first axis direction (e.g., -Z direction of FIG. 3). The side surface may surround the first surface and the second surface with the first axis direction as the center.

[0045] In one embodiment, one or more air injection holes (1111) and one or more air discharge holes (1112) communicating with the internal space (1141, 1142) may be formed on the outer surface of the motor housing (111). In one embodiment, the air injection holes (1111) may be formed on the first surface or the side surface of the motor housing (111). For example, the air injection holes (1111) may be formed on the side surface of the motor housing (111). In one embodiment, the air discharge holes (1112) may be formed on the second surface of the motor housing (111). The air discharge holes (1112) may be formed in plurality and may be formed spaced apart from each other on the second surface of the motor housing (111). In one embodiment, the air injection hole (1111) may function as a passage through which air is injected into the internal space (1141, 1142) of the motor housing (111), and the air discharge hole (1112) may function as a passage through which air is discharged from the internal space (1141, 1142) of the motor housing (111).

[0046] A stator (116) and a rotor (115) can form a rotating magnetic field. In one embodiment, the stator (116) can be composed of a plurality of metal cores and coils wound on the outer surfaces of each of the plurality of metal cores. The plurality of metal cores constituting the stator (116) can surround the circumference of the shaft (112) as shown in FIG. 6. The stator (116) can be fixedly arranged within the motor housing (111). In one embodiment, the rotor (115) can form a rotational torque by being subjected to a force by an electromagnetic field formed according to a current applied to the stator (116). In one embodiment, the rotor (115) can be formed in a form that surrounds the circumference of the shaft (112). The rotor (115) can be composed of a permanent magnet. In one embodiment, the motor unit (110) may be formed in a structure in which the rotor (115) is arranged on the inside of the stator (116) as shown in FIG. 6, but this is merely an example, and the rotor (115) may be formed in a structure in which the stator (116) is arranged on the outside. In one embodiment, the rotor (115) is connected to the shaft (112) and may rotate the shaft (112) through rotational torque generated by electromagnetic force.

[0047] In one embodiment, the shaft (112) may penetrate the motor housing (111) in a first axial direction and may be rotated by the rotor (115). In one embodiment, the shaft (112) may include a first extension portion (1121) extending forwardly through the first surface in the first axial direction. In one embodiment, the shaft (112) may have a rearwardly exposed portion in the second axial direction. For example, the shaft (112) may include a second extension portion (1122) extending rearwardly so as to be exposed to the second surface. However, the shaft (112) may also be formed so as not to be exposed to the second surface.

[0048] In one embodiment, when looking at the cross-section of the motor assembly (1) as shown in FIG. 4, the air injection hole (1111) may be formed on the side of the motor housing (111) so as to be closer to the first surface than the stator (116). For example, the stator (116) may be positioned between the air injection hole (1111) and the air discharge hole (1112) when viewed from the cross-section. With this structure, when air is introduced into the motor housing (111) through the air injection hole (1111), the air introduced into the internal space (1141, 1142) passes through the entire area of ​​the stator (116) to cool the stator (116) and then is discharged to the outside through the air discharge hole (1112), so that an effective heat dissipation function according to air circulation can be achieved.

[0049] In one embodiment, a plurality of air exhaust holes (1112) may be arranged spaced apart from the central axis on the second surface of the motor housing (111) as shown in FIG. 2. In this case, since the air introduced into the motor housing (111) evenly circulates throughout the entire internal space (1141, 1142) and exits through each air exhaust hole (1112), even cooling of the entire internal space (1141, 1142) can be achieved.

[0050] In one embodiment, the cooling unit (120) can cool the motor unit (110). In one embodiment, the cooling unit (120) can inject air into the motor housing (111). In one embodiment, the cooling unit (120) can include an impeller housing (121) and an impeller (122).

[0051] In one embodiment, the impeller housing (121) may include a rotation space formed inside in which the impeller (122) rotates, and an inlet (1202) and an outlet (1201) that communicate the rotation space with the outside. When the impeller (122) rotates, air may be introduced into the rotation space inside the impeller housing (121) through the inlet (1202), and then discharged to the outside of the impeller housing (121) through the outlet (1201).

[0052] In one embodiment, the impeller (122) is rotatably disposed within the impeller housing (121) and is driven by power to rotate and blow air in one direction, for example, from the inlet (1202) toward the outlet (1201).

[0053] In one embodiment, the impeller housing (121) may be in communication with the motor housing (111). For example, the discharge port (1201) of the impeller housing (121) may be in communication with the air injection hole (1111) of the motor housing (111). In this case, when the impeller (122) rotates, air discharged through the impeller housing (121) may be supplied into the motor housing (111) through the air injection hole (1111) and circulate inside the motor housing (111).

[0054] The impeller housing (121) and the motor housing (111) can be connected through a connecting tube (130). The connecting tube (130) connects the air injection hole (1111) and the discharge port (1201) and allows air to flow between the motor housing (111) and the impeller housing (121).

[0055] In one embodiment, the cooling unit (120) may be operated through output according to the operation of the motor unit (110). For example, the impeller (122) of the cooling unit (120) may be rotated by receiving a portion of the rotational output of the shaft (112) of the motor unit (110).

[0056] In one embodiment, the impeller housing (121) may be disposed on the second surface of the motor housing (111). In this case, the impeller (122) may rotate in conjunction with the shaft (112). For example, the impeller (122) may be connected to a second extension portion (1122) of the shaft (112) exposed on the second surface of the motor housing (111). In this case, the impeller (122) may rotate synchronously with the rotation of the shaft (112) to perform an air circulation operation into the inside of the motor housing (111). In other words, since the shaft (112) and the impeller (122) rotate simultaneously, the motor assembly (1) may generate rotational power through the motor unit (110) and simultaneously perform cooling of the motor unit (110) through the cooling unit (120).

[0057] In one embodiment, when the impeller housing (121) is arranged on the second surface of the motor housing (111), the air exhaust hole (1112) may be formed in a portion of the second surface that does not overlap with the impeller housing (121), as shown in FIG. 5. For example, even when the impeller housing (121) is integrally connected to the motor housing (111), air exhaust through the air exhaust hole (1112) is not interfered with, so that air circulation can be effectively performed.

[0058] Although the embodiments described above have been described with limited drawings, those skilled in the art will appreciate that various technical modifications and variations can be applied based on the above. For example, appropriate results can still be achieved even if the described techniques are performed in a different order than described, and / or components of the described systems, structures, devices, circuits, etc. are combined or combined in a different manner than described, or are replaced or substituted with other components or equivalents.

[0059] Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims described below.

Claims

1. In the motor assembly, motor housing; A stator disposed inside the above motor housing; A rotor disposed inside the motor housing and rotating by a current applied to the stator; A shaft penetrating the motor housing in the first axial direction and connected to the rotor to rotate; An impeller housing having an inlet and an outlet formed therein; and An impeller is disposed within the impeller housing, rotates by power, and flows air through the impeller housing. The above motor housing, An air injection hole formed on the outer surface and for allowing air to flow into the interior of the motor housing; and It is formed on the outer surface and includes an air exhaust hole for exhausting air from the inside of the motor housing, The air injection hole of the above motor housing is connected to the discharge port of the above impeller housing, Further comprising a connecting tube for flowing air between the air injection hole of the motor housing and the discharge port of the impeller housing. Motor assembly.

2. In paragraph 1, The above motor housing, A first surface facing the first axis direction and having a shaft extending outward; A second surface facing a second axis direction opposite to the first axis direction; and Including a side surface surrounding the first surface and the second surface with the first axis direction as the center, One or more air exhaust holes are formed on the second surface, A motor assembly, wherein an air injection hole is formed on either the first surface or the side surface.

3. In paragraph 2, The above air injection hole is formed on the side, The motor assembly, wherein the air injection hole is adjacent to the first surface rather than the stator.

4. In paragraph 2, The above impeller housing is arranged on the second surface of the above motor housing, A motor assembly in which the impeller is coupled to the shaft and rotates.

5. In paragraph 4, The above shaft, A first extension portion extending to protrude outward from the first surface; and Including a second extension portion exposed on the second surface, The above impeller is a motor assembly connected to the second extension portion.

6. In paragraph 4, Based on the state of looking at the second side above, A motor assembly wherein the plurality of air exhaust holes and the impeller housing are non-overlapping.

7. In cable transmission devices, Support plate including front and back; A pair of power balls arranged on the front of the above support plate and rotating in opposite directions around a pair of axes perpendicular to the front and parallel to each other to transmit a cable; and A motor assembly for transmitting power to at least one of the pair of power balls, The above motor assembly, A motor housing having air injection holes and air exhaust holes formed; A stator disposed inside the above motor housing; A rotor disposed inside the motor housing and rotating by a current applied to the stator; A shaft penetrating the motor housing in the first axial direction and connected to the rotor to rotate; An impeller housing having an inlet and an outlet formed therein; An impeller disposed within the impeller housing, rotating by power and causing air to flow through the impeller housing; and A cable transmission device comprising a connecting tube that connects the motor housing and the impeller housing and connects the discharge port and the air injection hole.

8. In paragraph 7, The shaft is exposed to the outside of the motor housing in a second axis direction opposite to the first axis direction, A cable transmission device in which the impeller is connected to the shaft exposed in the second axial direction and rotates in conjunction with the rotation of the shaft.

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