KR20240124774A - Motor - Google Patents

Abstract

A motor is provided. According to an aspect of the present invention, the motor comprises: a first housing; a second housing arranged to face one side of the first housing; a shaft coupled to the center of the first housing and the second housing; a first driving unit arranged on the outside of the shaft; a second driving unit arranged to face the first driving unit; a bearing arranged between the first housing and the second housing and supporting rotation of the first housing; and a fastening member having a head and a fastening unit protruding from one side of the head and coupled to the first housing or the second housing, wherein one side of the head supports one side of the bearing.

Description

MOTOR

The present invention relates to a motor.

A motor is a device that converts electrical energy into rotational energy by utilizing the force that a conductor receives in a magnetic field. Recently, as the use of motors has expanded, the role of motors has become more important. In particular, as the electrification of automobiles has rapidly progressed, the demand for motors applied to steering systems, braking systems, steering systems, and sensor systems has increased significantly.

Recently, various sensors are essential for implementing advanced driver assistance systems (ADAS) and even autonomous driving, and a representative example of such sensors is LIDAR (LIght Detection And Ranging).

For implementing general ADAS or semi-autonomous driving, a fixed lidar is sufficient, but if fully autonomous driving is assumed, a rotating lidar that scans the vehicle's surroundings while rotating is required. Here, since the rotating lidar sensor rotates more than 360 degrees in one direction, a method for continuously supplying power to the rotating sensor is required.

When it is necessary to continuously supply power to the rotating side that rotates more than 360 degrees around a rotating shaft fixed on the fixed side, the application of a rotary type transformer with a transmission terminal on the fixed side and a reception terminal on the rotating side within the motor can be considered.

Korean Patent Publication No. 10-2020-0143887 (published on December 28, 2020)

The problem that the present invention seeks to solve is to provide a motor that can reduce power consumption by improving the structure.

In addition, it provides a motor that can guide the movement of air within the housing to increase heat dissipation efficiency.

According to an aspect of the present invention for achieving the above object, a motor comprises: a first housing; a second housing arranged to face one side of the first housing; a shaft coupled to the center of the first housing and the second housing; a first driving unit arranged on the outside of the shaft; a second driving unit arranged to face the first driving unit; a bearing arranged between the first housing and the second housing and supporting rotation of the first housing; and a fastening member having a head and a fastening unit protruding from one side of the head and coupled to the first housing or the second housing, wherein one side of the head supports one side of the bearing.

Through this embodiment, there is an advantage in that the bearing can be more firmly fixed in the rotational support area through a bearing fixing structure using multiple fastening members.

Accordingly, since the size of the bearing can be reduced compared to before, the power consumption of the motor can be reduced by reducing the friction torque that may be generated by driving, and there is an advantage in that miniaturization is possible.

In addition, since the air guide rotates along with the rotation of the first housing, the heat generated by the operation of the motor is discharged to the outside together with the air, which has the advantage of improving heat dissipation efficiency.

FIG. 1 is a perspective view showing the appearance of a motor according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of a first housing and a second housing according to an embodiment of the present invention.
Figure 3 is a cross-sectional view of a motor according to an embodiment of the present invention.
Figure 4 is an enlarged view of A in Figure 3.
Figure 5 is an enlarged view of B in Figure 4.
Figure 6 is a cross-sectional view of a first housing according to an embodiment of the present invention.
Figure 7 is a perspective view of an air guide according to an embodiment of the present invention.
Figure 8 is a plan view of an air guide according to an embodiment of the present invention.
FIG. 9 is an enlarged perspective view of a fan within an air guide according to an embodiment of the present invention.
FIG. 10 is a plan view illustrating a combined structure of a frame and a fan according to an embodiment of the present invention.
FIG. 11 is a drawing for explaining the flow of air inside a motor according to an embodiment of the present invention.
Figure 12 is a table comparing the temperature of the motor depending on the presence or absence of an air guide.
Fig. 13 is a perspective view illustrating a modified example of an air guide according to an embodiment of the present invention.
Figure 14 is a plan view of a modified example of an air guide according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

However, the technical idea of the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of the present invention, one or more of the components among the embodiments can be selectively combined or substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention can be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, can be interpreted in consideration of the contextual meaning of the relevant technology.

Additionally, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention.

In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as "A and/or at least one (or more) of B, C", it may include one or more of all combinations that can be combined with A, B, C.

In addition, when describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and are not intended to limit the nature, order, or sequence of the components.

And, when a component is described as being 'connected', 'coupled', or 'connected' to another component, it may include not only cases where the component is 'connected', 'coupled', or 'connected' directly to the other component, but also cases where the component is 'connected', 'coupled', or 'connected' by another component between the component and the other component.

In addition, when described as being formed or arranged "above" or "below" each component, "above" or "below" includes not only the case where the two components are in direct contact with each other, but also the case where one or more other components are formed or arranged between the two components. In addition, when expressed as "above" or "below", the meaning of the downward direction as well as the upward direction based on one component may be included.

The term 'axial direction' used below is defined as the direction corresponding to the longitudinal direction of the shaft. 'Axial direction' can be in the vertical direction.

The 'radial direction' used below is defined as a direction perpendicular to the 'axial direction' described above. The 'radial direction' can be defined as a direction in which the first driving unit and the second driving unit face each other.

FIG. 1 is a perspective view showing the appearance of a motor according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a first housing and a second housing according to an embodiment of the present invention, FIG. 3 is a cross-sectional view of a motor according to an embodiment of the present invention, FIG. 4 is an enlarged view of A in FIG. 3, and FIG. 5 is an enlarged view of B in FIG. 4.

Referring to FIGS. 1 to 5, a motor (10) according to an embodiment of the present invention may include a first housing (100), a second housing (200), a shaft (310), a first driving unit (320), a second driving unit (330), a third driving unit (400), and bearings (510, 520), but may be implemented excluding some of these configurations, and additional configurations are not excluded.

The motor (10) may have an outer shape formed by the combination of the first housing (100) and the second housing (200). The first housing (100) and the second housing (200) may be arranged in a vertical direction. The first housing (100) may be arranged above the second housing (200). The second housing (200) may be arranged below the first housing (100). Accordingly, the first housing (100) may be referred to as an upper housing, and the second housing (200) may be referred to as a lower housing. The first housing (100) may be rotated with respect to the second housing (200). The second housing (200) may be fixed.

The first housing (100) may have a circular cross-sectional shape. The first housing (100) may include a first side plate (105). The first side plate (105) may form a side surface of the first housing (100). When the first housing (100) and the second housing (200) are combined, an outer surface of the first side plate (105) may be exposed to the outside. The lower end of the first side plate (105) may be spaced apart from the upper end of the second side plate (205) of the second housing (200) in the vertical direction by a predetermined distance, which will be described later.

The first housing (100) may have a lower surface facing the second housing (200) and an upper surface facing the lower surface. The upper surface of the first housing (100) may form the upper surface of the motor (10). A groove (110) having a shape that is sunken downward compared to other regions may be formed on the upper surface of the first housing (100). The groove (110) may be arranged at the center of the upper surface of the first housing (100). A first cover (112) may be arranged on the groove (110). The first cover (112) may be in the shape of a circular plate having a predetermined thickness. The first cover (112) may include a plurality of holes. A transmission terminal (490) electrically connected to a third driving unit (400) to be described later may be arranged on the bottom surface of the groove (110). The above transmission terminal (490) can be arranged to penetrate the upper and lower surfaces of the first housing (100).

The first housing (100) may include a first plate (101). The first plate (101) may be referred to as an upper plate. The first side plate (105) may have a shape that is bent downward and extended from an edge of the first plate (101). A portion of the upper surface of the first plate (101) may form a bottom surface of the groove (110). The lower surface of the first plate (101) may be defined as the lower surface of the first housing (100). The lower surface of the first plate (101) may be arranged to face the second housing (200).

As illustrated in FIG. 3, the lower surface of the first plate (101) may include a plurality of regions having different heights. In detail, the lower surface of the first plate (101) may include a first protruding region (120) and a second protruding region (130). The first protruding region (120) and the second protruding region (130) may have a shape that protrudes downward from the lower surface of the first plate (101). The first protruding region (120) and the second protruding region (130) may each have a circular cross-sectional shape. The first protruding region (120) may be arranged on the radially outer side of the second protruding region (130). The second protruding region (130) may be arranged on the radially inner side of the first protruding region (120). The lower end of the first protruding area (120) and the lower end of the second protruding area (130) may each be positioned lower than the lower end of the first side plate (105).

The first protruding region (120) may protrude downwardly from the lower surface of the first plate (101). The first protruding region (120) may include a plurality of step surfaces that are arranged in a stepwise manner in the vertical direction. The first protruding region (120) may include a first region (122) that protrudes downwardly from the lower surface of the first plate (101), a second region (124) that protrudes downwardly from the lower surface of the first region (122), and a third region (126) that protrudes downwardly from the lower surface of the second region (124). The plurality of step surfaces may include a first step surface that forms the lower surface of the first region (122), a second step surface that forms the lower surface of the second region (124), and a third step surface that forms the lower surface of the third region (126). The second step surface may be positioned lower than the first step surface and higher than the third step surface. The cross-sectional area of the second region (124) may be smaller than the cross-sectional area of the first region (122) and larger than the cross-sectional area of the third region (126).

A first screw hole (127, see Fig. 5) may be formed on the lower surface of the third region (126). The first screw hole (127) may be formed concavely upward on the lower surface of the third region (126). A fastening member (630) to be described later may be coupled to the first screw hole (127).

The second protruding region (130) may be positioned radially inwardly of the first protruding region (120). The second protruding region (130) may protrude downwardly from the lower surface of the first plate (101). The lower end of the second protruding region (130) may be positioned higher than the lower end of the first protruding region (120), but, alternatively, the lower end of the second protruding region (130) may be positioned at the same height as the lower end of the first protruding region (120) or lower.

A step (150) having a shape that protrudes inwardly more than other areas may be formed on the inner surface of the second protruding area (130). Through the step (150), the space within the second protruding area (130) may be divided into a plurality of spaces arranged in the vertical direction.

In detail, the first housing (100) may include a plurality of spaces. The plurality of spaces may include a first space (140), a second space (160), and a third space (170). The first space (140), the second space (160), and the third space (170) may be arranged at the lower portion of the first housing (100). The first space (140), the second space (160), and the third space (170) may be formed on the lower surface of the first plate (101).

The first space (140) may be arranged between the first protruding area (120) and the second protruding area (130). The inner surface of the first space (140) may be defined by the inner surface of the first protruding area (120), the outer surface of the second protruding area (130), the lower surface of the first plate (101), and the upper surface of the second plate (210) of the second housing (200) to be described later. The third driving unit (400) may be arranged in the first space (140).

The second space (160) and the third space (170) may be arranged on the inner side of the second protruding area (130). The second space (160) and the third space (170) may be partitioned in the upper and lower direction by a step (150) protruding from the inner surface of the second protruding area (130). The second space (160) may be arranged above the third space (170). The third space (170) may be arranged below the second space (160). The step (150) may include a hole (152) through which the shaft (310) passes, and the diameter of the hole (152) may be larger than the diameter of the shaft (310). The second space (160) and the third space (170) may be mutually connected by the hole (152). The cross-sectional area of the second space (160) may be smaller than the cross-sectional area of the third space (170). The second space (160) and the third space (170) may each have a circular cross-sectional shape.

The motor (10) may include a second housing (200). The second housing (200) may be arranged at the lower portion of the first housing (100). The second housing (200) may have a circular cross-sectional shape. The second housing (200) may include a second side plate (205). The second side plate (205) may form a side surface of the second housing (200). When the first housing (100) and the second housing (200) are coupled, an outer surface of the second side plate (205) may be exposed to the outside. The upper end of the second side plate (205) may be spaced apart from the lower end of the first side plate (105) of the first housing (100) in the vertical direction by a predetermined distance.

The second housing (200) may include an upper surface facing the first housing (100) and a lower surface opposite the upper surface. The lower surface of the second housing (200) may form the lower surface of the motor (10). A groove (202) having a shape that is sunken upward more than other areas may be formed on the lower surface of the second housing (200). The groove (202) may be arranged at the center of the lower surface of the second housing (200). The groove (202) may be arranged on the inner side of the second side plate (205). A second cover (290) may be arranged on the groove (202). The second cover (290) may be in the shape of a circular plate having a predetermined thickness. The second cover (290) may include a plurality of holes. The lower surface of the second cover (290) can form the lower surface of the motor (10). The upper surface of the second cover (290) can be spaced apart from the lower surface of the second plate (210) described later in the vertical direction.

The second housing (200) may include a second plate (210, see FIG. 3). The second plate (210) may be arranged to face the first plate (101) in a vertical direction. The second plate (210) and the first plate (101) may be spaced apart from each other in a vertical direction. The second plate (210) may have a shape that protrudes inwardly from the inner surface of the second side plate (205). The lower surface of the second plate (210) may form the bottom surface of the groove (202). The upper surface of the second plate (210) may be defined as the upper surface of the second housing (200). The upper surface of the second plate (210) may be arranged to face the first housing (100).

The shaft (310) may be coupled to the center of the second plate (210). A coupling groove (212) may be formed in the center of the second plate (210) so as to be concave downward compared to other areas and to which one end of the shaft (310) is coupled. A hole may be formed on the bottom surface of the coupling groove (212) to expose the lower surface of the shaft (310) downward. The lower surface of the second plate (210) corresponding to the coupling area of the shaft (310) may have a shape that protrudes downward compared to other areas.

The second plate (210) may include a plurality of holes. The plurality of holes may include a first through hole (218) and a second through hole (219). The first through hole (218) may be formed to penetrate from the upper surface to the lower surface of the second plate (210). The first through holes (218) may be provided in plurality and may be arranged to be spaced apart from each other along the circumferential direction. The plurality of first through holes (218) may be arranged radially inside a plurality of second through holes (219) to be described later. The first through holes (218) may be arranged to overlap vertically with the air guide (800) or the first and second driving units (320, 330) to be described later.

The second through hole (219) may be formed to penetrate from the upper surface to the lower surface of the second plate (210). The second through hole (219) may be provided in plurality and may be arranged to be spaced apart from each other along the circumferential direction. The plurality of second through holes (219) may be arranged on the radially outer side of the plurality of first through holes (218). The second through hole (219) may be arranged to face a fastening member (630) to be described later in the vertical direction. The fastening member (630) may be exposed downward through the second through hole (219). The cross-sectional area of the second through hole (219) may be larger than the cross-sectional area of the first through hole (218).

A third protruding region (220) that protrudes upwardly more than other regions may be arranged on the upper surface of the second plate (210). The third protruding region (220) may be arranged on the outer side of the formation region of the first through hole (218) and the second through hole (219) on the second plate (210). The third protruding region (220) may be arranged to overlap at least a portion of the first protruding region (120) or the second protruding region (130) in a direction perpendicular to the axial direction. The third protruding region (220) may be arranged on the outer side of the first protruding region (120) and the second protruding region (130). The inner surface of the third protruding region (220) may be spaced apart from the outer surface of the first protruding region (420) in a direction perpendicular to the axial direction. The third protruding region (130) may be arranged to overlap with the second bearing (520) described later in a direction perpendicular to the axial direction. The third protruding region (130) may be arranged to overlap with the first core (430) in the third driving unit (400) described later in a direction perpendicular to the axial direction. The third protruding region (130) may be arranged to overlap with the first driving unit (320) or the second driving unit (340) in a direction perpendicular to the axial direction.

The third protruding region (220) may include a fourth region (222) protruding upward from the upper surface of the second plate (210), and a fifth region (224) protruding upward from the upper surface of the fourth region (222). The upper surface of the fourth region (222) and the upper surface of the fifth region (224) may be arranged with a step in the vertical direction. The cross-sectional area of the fourth region (222) may be formed to be larger than the cross-sectional area of the fifth region (224). The axial length of the fourth region (222) may be smaller than the axial length of the fifth region (224).

A second screw hole (221, see Fig. 4) may be formed on the upper surface of the fifth region (224). The second screw hole (221) may be formed concavely downward on the upper surface of the fifth region (224). A fastening member (620) to be described later may be coupled to the second screw hole (221).

The above motor (10) may include a shaft (310). The shaft (310) may be coupled at both ends to the first housing (100) and the second housing (200). The shaft (310) may be coupled to the center of the first housing (100). The shaft (310) may be coupled to the center of the second housing (200). One end of the shaft (310) may protrude upward from the first plate (101). The other end of the shaft (310) may be coupled to the coupling groove (212) formed on the second plate (210) of the second housing (200). The shaft (310) may be arranged to overlap with the first driving unit (320), the second driving unit (330), the third driving unit (440), and the bearing (510, 520) in a direction perpendicular to the axial direction. The shaft (310) may not rotate. The shaft (310) may form a center of rotation of the first housing (100).

The first driving unit (320) may be arranged on the outside of the shaft (310). The first driving unit (320) may have a ring-shaped cross-section. The shaft (310) may be coupled to the center of the first driving unit (320). The first driving unit (310) may include a magnet. The first driving unit (310) may be a permanent magnet.

The second driving unit (330) may be arranged on the outside of the first driving unit (320). The second driving unit (330) may be arranged to be spaced apart from the first driving unit (320) in the radial direction. The second driving unit (330) may include a ring-shaped cross-section. The first driving unit (310) and the shaft (310) may be arranged at the center of the second driving unit (330). The second driving unit (330) may include a coil. The first housing (100) may rotate by the electromagnetic interaction between the first driving unit (320) and the second driving unit (330).

The first driving unit (320) and the second driving unit (330) may be placed in the third space (170). The inner surface of the third space (170) may be defined by the lower surface of the step (150), the inner surface of the second protruding area (130), and the upper surface of the second plate (210).

Meanwhile, in this embodiment, the first driving unit (320) is a magnet and the second driving unit (330) is a coil, but this is not limited to the first driving unit (320) and the second driving unit (330) may be a magnet.

The motor (10) may include a third driving unit (400). The third driving unit (400) may be placed in the first space (140). The third driving unit (400) may be placed outside the second driving unit (330). The second protruding area (130) may be placed between the third driving unit (400) and the second driving unit (330). The third driving unit (400) may be a transformer for wirelessly transmitting power. The third driving unit (400) may be a rotary transformer. A part of the third driving unit (400) may be placed in the first housing (100), and another part of the third driving unit (400) may be placed in the second housing (200).

The third driving unit (400) may include a stator and a rotor. The stator may be placed in the second housing (200). The stator may be coupled to the second plate (210). The rotor may be coupled to the lower surface of the first plate (101). The rotor may be coupled to the lower surface of the first housing (100). The stator and the rotor may be spaced apart from each other by a predetermined distance in the axial direction. The stator may be referred to as a transmitting end, and the rotor may be referred to as a receiving end. The stator may be fixed together with the second housing (200), and the rotor may rotate together with the first housing (100).

The stator may include a first core (430) and a first coil (440). The rotor may include a second core (410) and a second coil (420). The first core (430) may be coupled to an upper surface of the second plate (210). The second core (410) may be coupled to a lower surface of the first plate (101). The first coil (440) may be wound around the first core (430). The second coil (420) may be wound around the second core (410). The first coil (440) may be a primary coil. The second coil (420) may be a secondary coil. The first coil (440) and the second coil (420) may be arranged to face each other in the axial direction.

Accordingly, when current is applied to the first coil (440) when the rotor rotates together with the first housing (100), the induced electromotive force generated through electromagnetic induction by the first coil (440) can be induced to the rotating second coil (420) by a contactless power transmission method. Accordingly, the power in the first coil (440) can be boosted or lowered and transmitted to the second coil (420).

The power transmitted to the above rotor can be transmitted to another configuration placed on the first housing (100) through the above transmission terminal (490, see FIG. 1). For example, the above transmission terminal (490) can be connected to a printed circuit board (not shown) in the lidar sensor.

The above motor (10) may include bearings (510, 520). The bearings (510, 520) may include a first bearing (510) arranged between the first housing (100) and the shaft (310), and a second bearing (520) arranged between the first housing (100) and the second housing (200).

The first bearing (510) can support the rotation of the first housing (100) between the first housing (100) and the shaft (310). The first bearing (510) can be arranged in the second space (160). The second space (160) can be formed to be concave downward from the center of the upper surface of the first plate (101) compared to other areas. The first bearing (510) can be arranged on the upper portion of the step (150). The first bearing (510) can be arranged on the inner side of the second protruding area (130). In some cases, the upper surface of the first bearing (510) can be exposed upward from the first housing (100).

The first bearing (510) may be a ball bearing in which a ball (516) is arranged between an inner ring (512) and an outer ring (514). The inner ring (512) of the first bearing (510) may be coupled to an outer surface of the shaft (310). The outer ring (514) of the first bearing (510) may be coupled to an inner surface of the second protruding region (130). The outer ring (514) of the first bearing (510) may be coupled to an inner surface of the second space (160). The ball (516) of the first bearing (516) is arranged between the inner ring (512) and the outer ring (514) and may rotate together with the rotation of the first housing (100).

The second bearing (520) can support the rotation of the first housing (100) between the first housing (100) and the second housing (200). The second bearing (520) can be arranged between the first protruding area (120) and the third protruding area (220). The second bearing (520) can be arranged between the outer surface of the first protruding area (120) and the inner surface of the third protruding area (220). The lower surface of the second bearing (520) can be placed on the upper surface of the fourth area (222) of the third protruding area (220). The lower surface of the second bearing (520) can be spaced upward from the upper surface of the second plate (210) by the fourth area (222). The second bearing (520) may be supported by the inner surface of the fifth region (224). The upper surface of the second bearing (520) may be in contact with the lower surface of the second region (124) of the first protruding region (120). The second bearing (520) may be supported by the outer surface of the third region (126).

In detail, the second bearing (520) may be a ball bearing in which a ball (526) is arranged between an outer ring (524) and an inner ring (522). The outer ring (524) of the second bearing (520) may be combined with the third protruding region (220). The lower surface of the outer ring (524) may be in contact with the upper surface of the fourth region (222). The outer surface of the outer ring (524) may be in contact with the inner surface of the fifth region (224). The inner ring (522) of the second bearing (520) may be combined with the first protruding region (120). The upper surface of the inner ring (522) may be in contact with the lower surface of the second region (124). The inner surface of the inner ring (522) may be in contact with the outer surface of the third region (126). The above ball (526) is placed between the outer ring (524) and the inner ring (522) and can rotate together with the rotation of the first housing (100).

The above motor (10) may include a fastening member (620, 630). Through the fastening member (620, 630), the second bearing (520) may be more firmly coupled with the first housing (100) and the second housing (200).

In detail, the above fastening member (620, 630) may include a first fastening member (630) and a second fastening member (620).

The first fastening member (630) may be coupled to the lower surface of the first protruding area (120). The first fastening member (630) may be coupled to the first screw hole (127) formed on the lower surface of the first protruding area (120). The first fastening member (630) may include a first head portion (632) and a first fastening portion (634) that protrudes upward from the upper surface of the first head portion (632) and is coupled within the first screw hole (127). A screw thread or a screw groove may be formed on the inner surface of the first screw hole (127). A screw groove or a screw thread may be formed on the outer surface of the first fastening portion (634). The first fastening member (630) may be screw-coupled to the first screw hole (127). As illustrated in FIG. 5, the vertical length of the first fastening portion (634), which is defined from the upper surface of the first head portion (632) to the upper end of the first fastening portion (634), may be formed to be smaller than the vertical length of the first screw hole (127). Accordingly, the first screw hole (127) may include a first spaced portion (740), which is an area where the first fastening portion (634) is not arranged. The first spaced portion (740) may be defined from the upper end surface, which is the bottom surface of the first screw hole (127), to the upper end of the first fastening portion (634). The first spaced portion (740) may be 10% or more of the vertical length of the first fastening portion (634).

The cross-sectional area of the first head (632) may be formed to be larger than the cross-sectional area of the lower surface of the first protruding region (120). The cross-sectional area of the first head (632) may be formed to be larger than the cross-sectional area of the third region (126). Accordingly, as shown in FIGS. 4 and 5, a portion of the upper surface of the first head (632) may be arranged to face the lower surface of the second bearing (620). The upper surface of the first head (632) may be in contact with the lower surface of the first protruding region (120) and a portion of the lower surface of the second bearing (620). A portion of the upper surface of the first head (632) may be in contact with the lower surface of the second bearing (620). The upper surface of the first head (632) may be in contact with the lower surface of the inner ring (522) of the second bearing (620). The area of the inner ring (522) that comes into contact with the first fastening member (630) may be 9% or more and 29% or less of the total area of the inner ring (522).

The upper surface of the first head portion (632) may be in contact with the lower surface of the first protruding area (120). Alternatively, the upper surface of the first head portion (632) may be spaced apart from the lower surface of the first protruding area (120). Specifically, when the upper surface of the first head portion (632) and the lower surface of the first protruding area (120) are spaced apart, the vertical separation distance may be 2 mm or less.

The first fastening members (630) may be provided in multiple numbers and arranged to be spaced apart from each other along the circumferential direction of the second bearing (520). For example, the first fastening members (630) may be provided in 12 pieces and arranged to form a 30-degree circumferential angle between two adjacent first fastening members (630) based on the rotational center of the first housing (100).

The second fastening member (620) can be coupled to the upper surface of the third protruding area (220). The second fastening member (620) can be coupled to the second screw hole (221) formed on the upper surface of the third protruding area (220).

On the third protruding area (220), a support plate (610) may be placed so that its lower surface contacts the upper surface of the third protruding area (220) and the upper surface of the second bearing (520). The support plate (610) may have a ring-shaped cross-section. The support plate (610) may be placed so that at least a portion of the third protruding area (220) and the second bearing (520) overlap in the axial direction.

The cross-sectional area of the support plate (610) may be larger than the cross-sectional area of the upper surface of the third protruding region (220). The lower surface of the support plate (610) may contact the upper surface of the fifth region (224) of the third protruding region (220) and the upper surface of the outer ring (524) of the second bearing (520), respectively. The support plate (610) may include a through hole through which the second fastening member (620) passes. The through hole may be formed to penetrate from the upper surface to the lower surface of the support plate (610). The inner surface of the through hole may be an inclined surface having a cross-sectional area of the through hole that becomes smaller as it goes downward. The area of the outer ring (524) of the second bearing (510) that comes into contact with the support plate (610) may be 9% or more of the total area of the outer ring (524).

The above support plate (610) can be fixed on the third protruding area (220) through the second fastening member (620).

As illustrated in FIG. 4, the second fastening member (620) may include a second head portion (622) and a second fastening member (624) that protrudes downward from the lower surface of the second head portion (622) and is coupled within the second screw hole (221). A screw thread or a screw groove may be formed on the inner surface of the second screw hole (221). A screw groove or a screw thread may be formed on the outer surface of the second fastening member (624). The second fastening member (620) may be screw-coupled to the second screw hole (221). As illustrated in FIG. 4, the vertical length of the second fastening member (624), which is defined from the lower surface of the second head portion (622) to the lower end of the second fastening member (624), may be formed to be smaller than the vertical length of the second screw hole (221). Accordingly, the second screw hole (221) may include a second separation portion, which is an area where the second fastening portion (624) is not arranged. The second separation portion may be defined from the lower surface of the second fastening portion (624) to the bottom surface of the second screw hole (211). The second separation portion may be 10% or more of the vertical length of the second fastening portion (624).

The second head part (622) may be coupled to the through hole of the support plate (610). The upper surface of the second head part (622) may protrude upward from the upper surface of the support plate (610). Alternatively, the upper surface of the second head part (622) may form the same plane as the upper surface of the support plate (610). An inclined surface may be formed on the outer circumferential surface of the second head part (622) in a shape in which the cross-sectional area of the second head part (622) becomes smaller as it goes downward, corresponding to the inclined surface of the through hole. In some cases, the second fastening member (620) may be screw-coupled within the through hole of the support plate (610).

The second fastening members (620) may be provided in multiple numbers and arranged to be spaced apart from each other along the circumferential direction of the second bearing (520).

According to the structure as described above, there is an advantage in that the bearing can be more firmly fixed in the rotation support area through the bearing fixing structure by a plurality of fastening members.

Accordingly, since the size of the bearing can be reduced compared to before, the power consumption of the motor can be reduced by reducing the friction torque that may be generated by driving, and there is an advantage in that miniaturization is possible.

Meanwhile, in this embodiment, the outer ring (524) of the second bearing (520) is coupled through the support plate (610) and the second fastening member (620), and the inner ring (522) is coupled through the first fastening member (630). However, this is not limited thereto, and the support plate (610) and the second fastening member (620) may be coupled to the inner ring (522) of the second bearing (520), and the first fastening member may be coupled to the outer ring (524). In addition, both the inner ring (522) and the outer ring (524) of the second bearing (520) may be coupled only through the first fastening member (630), or may be coupled only through the second fastening member (620) and the support plate (610).

Below, the heat dissipation structure of the motor (10) will be described.

FIG. 6 is a cross-sectional view of a first housing according to an embodiment of the present invention, FIG. 7 is a perspective view of an air guide according to an embodiment of the present invention, FIG. 8 is a plan view of an air guide according to an embodiment of the present invention, FIG. 9 is an enlarged perspective view of a fan inside an air guide according to an embodiment of the present invention, FIG. 10 is a plan view illustrating a joint structure of a frame and a fan according to an embodiment of the present invention, FIG. 11 is a drawing for explaining the flow of air inside a motor according to an embodiment of the present invention, and FIG. 12 is a table comparing the temperature of a motor depending on the presence or absence of an air guide.

Referring to FIGS. 2, 3, 6 to 12, a motor (10) according to an embodiment of the present invention may include an air guide (800). The air guide (800) may circulate air within the motor (10) to discharge heat within the motor (800) to the outside.

The air guide (800) may be combined with the first housing (100). The air guide (800) may be arranged on the inner side of the second protruding region (130). The air guide (800) may be arranged in the third space (170), which is the arrangement region of the first driving unit (320) and the second driving unit (330). The air guide (800) may be arranged below the first driving unit (320) and the second driving unit (330). The air guide (800) may be arranged on the outer side of the shaft (310). The air guide (800) may be arranged at the lower end of the third space (170). The air guide (800) may be arranged adjacent to the lower surface of the first housing (100).

The above air guide (800) may include a frame (810) and a fan (820).

The frame (810) may have a ring-shaped cross-section. A hole (812) may be formed in the center of the frame (810). The frame (810) may have a predetermined thickness. The frame (810) may rotate together with the first housing (100). The frame (810) may be coupled to the inner surface of the third space (170). A coupling structure for coupling the frame (810) may be formed on the inner surface of the third space (170). For example, a support protrusion (not shown) that supports the upper and lower surfaces of the frame (810) may be formed on the inner surface of the third space (170). Alternatively, the frame (810) may be coupled to the inner surface of the third space (170) through an adhesive. The lower surface of the above frame (810) can be arranged to form the same plane as the lower surface of the second protruding area (130).

The vertical thickness of the above frame (810) may be 2 mm or more and 3 mm or less.

The fan (820) may be formed to protrude inwardly from the inner surface of the frame (810). As the first housing (100) rotates, the fan (820) may rotate together with the frame (810), thereby causing air inside the motor (800) to flow in one or the other direction. For example, when the air guide (800) rotates, the air may flow upwardly from the first housing (100) or downwardly from the second housing (200). One end of the fan (820) protruding from the inner surface of the frame (810) may be arranged closer to the lower surface than the upper surface of the frame (810).

The above fans (820) may be provided in multiple numbers. The plurality of fans (820) may be arranged to be spaced apart from each other along the circumferential direction of the frame (810). For example, the number of the plurality of fans (820) may be 8 or more and 24 or less.

The fan (820) may include a first guide (822) that protrudes radially inwardly from the inner surface of the frame (810), and a second guide (820) that protrudes outwardly from one side of the first guide (822).

The first guide (822) may have a square plate shape. The first guide (822) may have a predetermined thickness in the vertical direction. The first guide (822) may include one end coupled to the inner surface of the frame (810) and the other end opposite the one end. The other end of the first guide (822) may be arranged to face the center of the air guide (800).

The first guide (822) may include a first side defined in a radial direction and a second side adjacent to and perpendicular to the first side. A radial length (L1, see FIG. 9) of the first guide (822) protruding from the inner surface of the frame (810) may be 3 mm or more and 4.5 mm or less. The length of the first side may be 3 mm or more and 4.5 mm or less. A circumferential length (L2) of the first guide (822) may be 1 mm or more and 1.5 mm or less. The length of the second side may be 1 mm or more and 1.5 mm or less. The length of the first side may be three times or more the length of the second side.

Resistance of air coming into contact with the fan (820) through the first guide (822) can be primarily dispersed, thereby minimizing rotational resistance of the air guide (800).

The second guide (826) may have a shape that protrudes outward from one side of the first guide (822). The second guide (826) may be bent from one side of the first guide (822) and extend outward. The second guide (826) may be arranged to be inclined with respect to the first guide (822). The second guide (826) may include one end connected to the first guide (822) and the other end opposite the one end. The second guide (826) may be formed to be inclined so that the vertical distance from the first guide (822) increases from one end to the other end. As illustrated in FIG. 10, the first guide (822) and the second guide (826) may be arranged to form a first angle. The first angle may be an obtuse angle. The first angle may be 30 degrees or more and 45 degrees or less. There is. When the first angle is less than 30 degrees, the air in contact with the fan (810) cannot rise along the surface of the second guide (826), and a phenomenon of circling around the inner surface of the second guide (826) may occur. When the first angle exceeds 45 degrees, the air in contact with the fan (810) cannot rise upward, and may flow to the side of the fan (810). Accordingly, the first angle according to the embodiment of the present invention is formed to be 30 degrees or more and 45 degrees or less, so that the air can be easily guided upward through the fan (810).

The second guide (826) may include a first side connected to the first guide (822) and a second side adjacent to and perpendicular to the first side. The length (L3, see FIG. 9) of the second guide (826), defined as a straight-line distance from one end of the second guide (826) to the other end, may be 2 mm or more and 3 mm or less. The length of the second side of the second guide (826) may be 2 mm or more and 3 mm or less. The radial length (L4) of the second guide (826), that is, the length of the first side, may be 2 mm or more and 3 mm or less. Accordingly, the second guide (826) may have a square or rectangular cross-sectional shape. The thickness (L5) of the second guide (826) may be 50% or less of the thickness of the frame (810). For example, the thickness (L5) of the second guide (826) may be 0.5 mm or more and 1 mm or less.

In order to facilitate bending of the second guide (826) relative to the first guide (822), a slit (824) may be formed on a side surface of the first guide (822) connected to the second guide (826). The slit (824) may be arranged on an outer side of the side surface of the first guide (822) adjacent to the connecting surface of the second guide (826). The slit (824) may be formed to be more concave than other regions. The bottom surface of the slit (824) may be curved. The radial length of the slit (824) may be 0.4 mm to 0.5 mm.

According to the structure as described above, the air guide (800) rotates together with the rotation of the first housing (100), so that the heat generated by the operation of the motor (10) can be smoothly discharged to the outside through a convection phenomenon via the fan (820).

Specifically, as illustrated in FIG. 11, air introduced into the space within the motor (10) through the first side plate (105) of the first housing (100) and the second side plate (205) of the second housing (200) may be guided along the outer surface of the first protruding region (120) to the second bearing (520). The air may pass between the inner ring (522) and the outer ring (524) of the second bearing (520) and between the stator and the rotor of the third driving unit (400) and then be guided in flow through the air guide (800). In this case, the air may be guided upward by the rotation of the air guide (800) and may be discharged upward from the first housing (100). The path of air discharged upward from the first housing (100) may be defined as the first path. The first housing (100) may include a third through hole (135) penetrating the lower surface of the step (150, see FIG. 3) from the upper surface of the first housing (100), and when air moves along the first path, air may be discharged to the outside of the motor (100) through the third through hole (135).

The air may be guided downward by the rotation of the above air guide (800). The path of the air discharged downward from the first housing (100) may be defined as a second path. When the air moves along the second path, the air may be discharged to the outside of the motor (100) through the first through hole (218) formed in the second plate (210).

The first path and the second path, which are air discharge paths, can be either single or combined, and can be set by adjusting the rotational direction of the air guide (800) and the up-and-down direction of the fan (820) within the air guide (800). For example, when the air guide (800) rotates clockwise, air can be discharged through the first path, and when the air guide (800) rotates counterclockwise, air can be discharged through the second path.

As shown in Fig. 12, according to the present embodiment, it can be confirmed that the temperatures of the first driving unit (320), the second driving unit (330), and the third driving unit (400) are formed lower than in a conventional motor structure in which the air guide is not arranged, due to the air guide structure through the air guide (800).

FIG. 13 and FIG. 14 are drawings illustrating a modified example of an air guide according to an embodiment of the present invention, in which the air guide (900) may similarly include a frame (910) and a fan (920). In this modified example, the fan (920) may have a shape that protrudes outward from the outer surface of the frame (910) rather than the inner surface of the frame (910), and may be provided in multiple numbers and arranged along the outer circumferential direction of the frame (910). The fan (920) may guide the flow of air by rotation through a first guide protruding from the outer surface of the frame (910) and a second guide protruding in the circumferential direction from a side surface of the first guide.

The shape and size of the first guide and the second guide in this modified example are based on the description of the first guide and the second guide in the above-described embodiment.

In the above, even though all the components constituting the embodiments of the present invention have been described as being combined or operated in combination, the present invention is not necessarily limited to these embodiments. That is, within the scope of the purpose of the present invention, all of the components may be selectively combined and operated one or more times. In addition, the terms "include," "compose," or "have" described above, unless specifically stated to the contrary, mean that the corresponding component may be inherent, and therefore should be interpreted as including other components rather than excluding other components. All terms, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the related technology, and shall not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely an illustrative description of the technical idea of the present invention, and those skilled in the art will appreciate that various modifications and variations may be made without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to explain it, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

Claims (15)

1st housing;
A second housing arranged to face one side of the first housing;
A shaft coupled to the center of the first housing and the second housing;
A first driving unit arranged on the outside of the above shaft;
A second driving unit positioned facing the first driving unit;
A bearing disposed between the first housing and the second housing and supporting rotation of the first housing; and
It includes a fastening member having a head and a fastening member protruding from one side of the head and coupled to the first housing or the second housing,
A motor in which one side of the above head supports one side of the above bearing.
In the first paragraph,
The above first housing includes a first plate,
A motor in which the first plate includes a first protruding region that protrudes downwardly from the other regions and supports the inner ring of the bearing.
In the second paragraph,
The first protruding region includes a second region that supports the surface of the inner ring of the bearing, and a third region that protrudes downward from the lower surface of the second region and supports the side surface of the inner ring of the bearing.
A motor in which the inner ring surface of the bearing facing the second region is a surface that faces upward and downward with respect to a surface of the bearing facing one side of the head.
In the first paragraph,
The above second housing includes a second plate that is arranged vertically apart from the first plate,
A motor in which the second plate includes a third protruding region that protrudes upwardly from the other regions and supports the outer ring of the bearing.
In paragraph 4,
The third protruding region includes a fourth region that supports one surface of the outer ring of the bearing, and a fifth region that protrudes upward from the upper surface of the fourth region and supports the side surface of the outer ring of the bearing.
A motor in which one surface of the outer ring of the bearing facing the fourth region is one surface of the bearing facing one surface of the head.
In the second paragraph,
The above fastening member includes a first fastening member,
The above first fastening member is a motor that is screw-connected to the lower surface of the first protruding area.
In paragraph 4,
The above fastening member includes a second fastening member coupled to the upper surface of the third protruding area,
A motor including a support plate disposed on the third protruding area and through which the second fastening member penetrates.
In Article 7,
The cross-sectional area of the above support plate is formed larger than the lower surface of the third protruding area,
A motor in which at least a portion of the lower surface of the above support plate is positioned facing the upper surface of the bearing outer ring.
In the first paragraph,
A motor in which the area of the bearing in contact with the head is 9% or more and 29% or less of the cross-sectional area of the inner ring of the bearing.
In the third paragraph,
A first screw hole to which the fastening part is joined is formed on the lower surface of the third area.
A motor in which the axial length of the first screw hole is greater than the axial length of the fastening portion.
In the first paragraph,
A motor in which the above bearings are arranged to overlap the first driving unit and the second driving unit in a direction perpendicular to the axial direction.
In paragraph 4,
A motor in which the second plate includes a through hole facing the fastening member.
In the first paragraph,
The above first driving unit includes a magnet,
The above second driving unit is a motor including a coil.
In Article 13,
Including a third driving unit arranged on the outside of the second driving unit,
The above third driving unit is a motor which is a rotary transformer.
In Article 14,
The third driving unit is a motor including a rotor coupled to the first housing and a stator coupled to the second housing.