KR102625015B1 - Motor - Google Patents

Abstract

Examples include shafts; a rotor coupled to the shaft; A stator disposed outside the rotor; a housing that accommodates the rotor and the stator and has an opening on one side; and a cover covering the opening, wherein the cover includes a cover plate portion; and a protrusion extending axially from the cover plate portion, wherein at least three grooves are formed in the protrusion. Accordingly, the motor according to the embodiment can secure sealing performance while preventing damage to the bearing when assembling the rotor inside the stator.

Description

Motor{Motor}

The embodiment relates to a motor.

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

Typically, a motor is provided with a shaft that is rotatable, a rotor coupled to the shaft, and a stator fixed to the inside of the housing. The stator is installed with a gap along the circumference of the rotor. Additionally, a coil that forms a rotating magnetic field is wound around the stator, causing electrical interaction with the rotor to induce rotation of the rotor. As the rotor rotates, the shaft rotates and generates driving force.

Additionally, a bus bar electrically connected to the coil is disposed on the top of the stator. The bus bar generally includes a ring-shaped bus bar housing and a bus bar terminal to which a coil is connected by being coupled to the bus bar housing. Typically, these busbar terminals are formed by pressing sheet metal such as copper plate.

Meanwhile, the sealing performance of the motor is determined by the cover and housing that are combined to form the outer shape of the motor. Here, the housing may have its central hole removed to satisfy the IP rating for sealing.

However, in the process of assembling the rotor inside a stator placed in a housing without a central hole, a problem occurs in which the bearing is damaged.

Hereinafter, damage to the bearing described above will be examined with reference to FIG. 1.

1 is a diagram showing assembly of a rotor cover assembly.

Referring to FIG. 1, the rotor cover assembly is assembled to the housing 20 with the stator 10 disposed therein.

The rotor cover assembly includes a cover 30, a shaft 40 disposed in the center of the cover 30, a rotor 50 disposed outside the shaft 40, and a bearing 60 disposed on the outer peripheral surface of the shaft 40. ) may include.

Here, the bearing 60 may include an upper bearing 61 disposed at the upper portion of the shaft 40 and a lower bearing 62 disposed at the lower portion of the shaft 40 depending on the arrangement position. As shown in FIG. 1, the upper bearing 61 may be supported by the cover 30.

However, when the rotor cover assembly is assembled into the housing 20 with the stator 10 disposed therein, the lower bearing 62 of the rotor cover assembly is damaged due to the attractive force between the magnetized rotor 50 and the stator 10. A phenomenon of hitting the protrusion 21 of the housing 20 occurs. Accordingly, there is a problem that the lower bearing 62 is damaged.

When assembling the rotor inside the stator, we provide a motor that can secure sealing performance while preventing damage to the bearing.

The problems to be solved by the embodiment are not limited to the problems mentioned above, and other problems not mentioned here will be clearly understood by those skilled in the art from the description below.

According to the embodiment, the above task includes: a shaft; a rotor coupled to the shaft; A stator disposed outside the rotor; a housing that accommodates the rotor and the stator and has an opening on one side; and a cover covering the opening, wherein the cover includes a cover plate portion; and a protrusion extending in the axial direction from the cover plate portion, wherein at least three grooves are formed in the protrusion.

Here, the grooves may be arranged to be spaced apart from the end of the protrusion at a predetermined first distance d1.

And, the groove is disposed at a predetermined second interval d2 at a corner where the cover plate and the protrusion meet,

The first gap d1 is greater than the second gap d2.

Additionally, the groove is formed by pressing one area of the protrusion in the radial direction, and a first protrusion may be formed on the inner surface of the protrusion by the pressing.

Additionally, the inner surface of the first protrusion may be inclined at a predetermined angle θ based on the axial direction.

Meanwhile, the groove may be arranged to be rotationally symmetrical with respect to the center C of the cover.

Additionally, the housing includes a housing plate portion; and a side wall portion protruding in the axial direction from the housing plate portion, wherein a second protrusion protruding inward is formed on the side wall portion.

And, the housing plate portion includes a plate-shaped body; and a ring-shaped ridge formed by protruding a portion of the main body, and a pocket portion is formed inside the ridge by the ridge, and the pocket portion can accommodate a lower bearing disposed on the outer peripheral surface of the shaft.

Additionally, the ridge may include an edge formed as a curved surface with a predetermined curvature.

Additionally, a hole is formed in the center of the main body, and the motor may further include a cap disposed to cover the hole.

Additionally, the upper surface of the second protrusion may contact the lower surface of the protrusion.

The motor according to the embodiment having the above configuration can secure sealing performance while preventing damage to the bearing when assembling the rotor inside the stator.

To this end, the motor can install the rotor inside the housing without damaging the bearings by using a groove formed on the outer peripheral surface of the cover.

At this time, the sealing performance of the motor can be improved by removing the hole on the bottom of the housing.

In addition, since the hole is eliminated and there is no need to apply a separate sealing member, the mass production of the motor can be improved. That is, when applying the sealing member, a curing time is required for the sealing member, so the coating process for the sealing member can be omitted, thereby improving the productivity of the motor.

1 is a diagram showing assembly of a rotor cover assembly.
Figure 2 is a perspective view showing a motor according to an embodiment;
Figure 3 is a cross-sectional view of the motor according to the first embodiment taken along line AA in Figure 1;
Figure 4 is a perspective view showing the cover of the motor according to the first embodiment;
5 is a side view showing the cover of the motor according to the first embodiment;
6 is a bottom view showing the cover of the motor according to the first embodiment;
Figure 7 is a cross-sectional view showing line BB in Figure 4,
8 is a perspective view showing the housing of the motor according to the first embodiment;
9 is a cross-sectional view showing the housing of the motor according to the first embodiment;
Figure 10 is a diagram showing the assembly process of the rotor cover assembly of the motor according to the first embodiment;
11 is a cross-sectional view of a motor according to the second embodiment;
Figure 12 is a perspective view showing the housing of the motor according to the second embodiment;
13 is a cross-sectional view showing the housing of the motor according to the second embodiment;
14 is a diagram showing the assembly process of the rotor cover assembly of the motor according to the second embodiment;
Figure 15 is a perspective view showing a cap of a motor according to the second embodiment.

Since the present invention can be subject to various changes and can have various embodiments, specific embodiments will be illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Terms containing ordinal numbers, such as second, first, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, the second component may be referred to as the first component without departing from the scope of the present invention, and similarly, the first component may also be referred to as the second component. The term and/or includes any of a plurality of related stated items or a combination of a plurality of related stated items.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

In the description of the embodiment, in the case where one component is described as being formed “on or under” another component, (on or under) includes both components that are in direct contact with each other or one or more other components that are formed (indirectly) between the two components. Additionally, when expressed as 'on or under', it can include not only the upward direction but also the downward direction based on one component.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

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 technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

Hereinafter, embodiments will be described in detail with reference to the attached drawings, but identical or corresponding components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted.

Embodiment 1

FIG. 2 is a perspective view showing a motor according to an embodiment, and FIG. 3 is a cross-sectional view of the motor according to the first embodiment taken along line A-A in FIG. 2. Here, the x-direction shown in FIG. 3 refers to the radial direction, and the y-direction refers to the axial direction.

Referring to FIGS. 1 and 2, the motor 1 according to the first embodiment includes a cover 100, a housing 200 disposed below the cover 100, and a stator disposed inside the housing 200. (300), a rotor 400 disposed inside the stator, a shaft 500 rotating with the rotor 400, a bus bar 600 disposed on the upper side of the stator, and a bearing disposed on the outer peripheral surface of the shaft 500. It may include (700). Here, the bearing 700 may include an upper bearing 710 disposed on the upper side of the shaft 500 and a lower bearing 720 disposed on the lower side depending on the arrangement position.

The cover 100 and the housing 200 may form the external shape of the motor 1. At this time, the housing 200 may be formed in a cylindrical shape with an opening formed at the top.

Therefore, an accommodating space can be formed inside by combining the cover 100 and the housing 200. And, as shown in FIG. 3, a stator 300, a rotor 400, a shaft 500, etc. may be arranged in the receiving space.

The cover 100 may be placed on the opening surface of the housing 200, that is, on the upper part of the housing 200, to cover the opening of the housing 200.

Figure 4 is a perspective view showing the cover of the motor according to the first embodiment, Figure 5 is a side view showing the cover of the motor according to the first embodiment, and Figure 6 is a bottom view showing the cover of the motor according to the first embodiment. , and FIG. 7 is a cross-sectional view taken along line B-B in FIG. 4.

Referring to FIGS. 4 and 7 , the cover 100 may include a plate-shaped cover plate portion 110 and a protrusion 120 extending in the axial direction from the cover plate portion 110. Here, the cover plate portion 110 and the protrusion 120 may be formed integrally.

The cover plate portion 110 may be formed in a plate shape.

A first hole 111 and a plurality of second holes 112 may be formed in the center of the cover plate portion 110. Additionally, the cover plate portion 110 may include a first pocket portion P1 whose center is depressed downward. Here, the first pocket portion P1 may be called a cover pocket portion.

A shaft 500 may be disposed inside the first hole 111. At this time, the upper bearing 710 is disposed on the upper side of the shaft 500, and the upper bearing 710 may be disposed in the first pocket portion P1. Accordingly, the cover plate portion 110 may support the upper bearing 710.

The terminal of the bus bar 600 may be placed inside the second hole 112. As shown in FIG. 4, three second holes 112 may be formed in the cover plate portion 110.

The protrusion 120 may protrude downward from the lower surface of the cover plate portion 110. For example, the protrusion 120 may protrude downward from the edge of the cover plate portion 110. At this time, the protrusion 120 may be formed in a cylindrical shape.

The groove 122 may be formed in the protrusion 120 to hold the cover 100 with a fixing device such as a jig. Accordingly, the end of the jig is disposed in the groove 122 so that the jig can press the cover 100.

At least three grooves 122 may be formed concavely on the outer peripheral surface 121 of the protrusion 120. The number of grooves 122 may be at least three arranged at preset intervals to prevent horizontal movement of the cover 100, but is not necessarily limited thereto.

Referring to FIG. 6, four grooves 122 may be arranged. At this time, the groove 122 may be arranged to be rotationally symmetrical with respect to the center C of the cover 100.

That is, since the grooves 122 are arranged on the same level, they can be arranged to be rotationally symmetrical with respect to the center C of the cover 100. Accordingly, the fixing device prevents the cover 100 from moving horizontally by applying a certain force to the outer peripheral surface 121 of the cover 100 through the groove 122.

Referring to FIG. 7 , the grooves 122 may be arranged to be spaced apart from the end of the protrusion 120 at a predetermined first distance d1. Additionally, the grooves 122 may be disposed at a predetermined second distance d2 at a corner where the cover plate 110 and the protrusion 120 meet.

At this time, the first gap d1 is larger than the second gap d2. Accordingly, the cover 100 can secure rigidity in response to the force applied to the groove 122. For example, most of the force applied to the cover 100 by the fixing device is supported by the cover plate 110.

The groove 122 can be formed by pressing one area of the protrusion 120 in the radial direction. At this time, a first protrusion 124 may be formed on the inner peripheral surface 123 of the protrusion 120 by the pressure.

The first protrusion 124 may be formed to protrude inward from the inner peripheral surface 123 of the protrusion 120.

As shown in FIG. 7, the inner surface 124a of the first protrusion 124 is formed to be inclined at a predetermined angle θ based on the axial direction. At this time, the inner surface 124a of the first protrusion 124 may be formed to be inclined upward. Accordingly, one surface of the groove 122 may also be formed to be inclined upward. Accordingly, the force applied to the groove 122 by the fixing device can be directed further toward the cover plate 110.

The housing 200 is disposed below the cover 100.

The housing 200 may be formed in a cylindrical shape. Additionally, the housing 200 can accommodate a stator 300, a rotor 400, etc. therein. At this time, the shape or material of the housing 200 may be modified in various ways. For example, the housing 200 may be made of a metal material that can withstand high temperatures.

FIG. 8 is a perspective view showing the housing of the motor according to the first embodiment, and FIG. 9 is a cross-sectional view showing the housing of the motor according to the first embodiment.

Referring to FIGS. 8 and 9 , the housing 200 may include a housing plate portion 210 and a side wall portion 220 extending upward from the housing plate portion 210.

The housing plate portion 210 may include a plate-shaped body 211 and a raised portion 212 formed by a portion of the body 211 protruding.

When viewed from above, the raised portion 212 may be formed in a ring shape. At this time, the raised portion 212 may be formed by pressing the lower portion of the main body 211. As shown in FIG. 9 , the housing plate portion 210 may be formed into a concave-convex shape by the protruding portion 212 .

Since the raised portion 212 is arranged to be radially spaced from the center C of the main body 211, a second pocket portion P2 may be formed inside the raised portion 212. Here, the second pocket portion (P2) may be called a housing pocket portion.

Also, the lower bearing 720 can be accommodated in the second pocket portion (P2). At this time, a washer may be placed below the lower bearing 720.

As shown in FIG. 9, the raised portion 212 may include a curved surface 212a formed with a predetermined curvature (1/R). Here, the curved surface 212a may be formed at an inner edge of the edges of the raised portion 212.

When the lower bearing 720 is inserted into the second pocket portion P2, the curved surface 212a may guide the insertion of the lower bearing 720. Accordingly, the curved surface 212a can minimize shock caused by collision with the lower bearing 720.

The side wall portion 220 may extend in the axial direction from the upper surface of the housing plate portion 210. At this time, the side wall portion 220 may protrude upward from the edge of the housing plate portion 210.

Meanwhile, a second protrusion 221 protruding inward may be formed on the side wall portion 220. For example, the second protrusion 221 may be formed to protrude inward from the inner peripheral surface 222 of the side wall portion 220.

At this time, the second protrusions 221 may be arranged along the circumferential direction at preset intervals. Accordingly, the upper surface 221a of the second protrusion 221 supports the end of the protrusion 120 constituting the cover 100. In detail, the upper surface 221a of the second protrusion 221 contacts the lower surface of the end side of the protrusion 120. Accordingly, the upper surface 221a of the second protrusion 221 serves as a position guide to seat the cover 100 to a preset position.

The second protrusion 221 may be formed by pressing one area of the side wall portion 220 in the radial direction. For example, a second protrusion 221 may be formed on the inner peripheral surface 222 of the side wall portion 220 by the pressure.

The stator 300 may be supported on the inner peripheral surface of the housing 200. And, the stator 300 is disposed outside the rotor 400. That is, the rotor 400 may be disposed inside the stator 300.

Referring to FIG. 3, the stator 300 includes a stator core 310, a coil 320 wound around the stator core 310, and an insulator 330 disposed between the stator core 310 and the coil 320. can do. Here, a wire whose outer peripheral surface is coated may be provided as the coil 320.

A coil 320 forming a rotating magnetic field may be wound around the stator core 310. Here, the stator core 310 may be made of one core or may be made of a plurality of split cores combined.

The stator core 310 may be formed by stacking a plurality of thin steel plates, but is not limited thereto. For example, the stator core 310 may be formed as a single piece.

The stator core 310 may include a cylindrical yoke (not shown) and a plurality of teeth (not shown).

Here, the teeth may be arranged to protrude from the yoke in the radial direction (x direction) based on the center C of the stator core 310. Additionally, the plurality of teeth may be arranged to be spaced apart from each other along the circumferential direction of the yoke. Accordingly, a slot may be formed between each of the teeth.

Meanwhile, the teeth may be arranged to face the magnet of the rotor 400. And, a coil 320 is wound around each of the teeth.

The insulator 330 insulates the stator core 310 and the coil 320. Accordingly, the insulator 330 may be disposed between the stator core 310 and the coil 320.

Accordingly, the coil 320 may be wound around the stator core 310 on which the insulator 330 is disposed.

Meanwhile, when current is supplied to the coil 320, electrical interaction with the magnet is induced, allowing the rotor 400 to rotate. When the rotor 400 rotates, the shaft 500 also rotates. At this time, the shaft 500 may be supported by the bearing 700.

The rotor 400 may be placed inside the stator 300. And, the shaft 500 may be coupled to the center.

The rotor 400 may be configured by combining a magnet (not shown) with a rotor core (not shown). For example, the rotor 400 may be configured with a magnet disposed on the outer peripheral surface of the rotor core.

Accordingly, the magnet forms a rotating magnetic field with the coil 320 wound around the stator 300. These magnets may be arranged so that the N and S poles are alternately positioned in the circumferential direction around the shaft 500.

Accordingly, the rotor 400 rotates due to the electrical interaction between the coil 320 and the magnet, and when the rotor 400 rotates, the shaft 500 rotates to generate driving force for the motor 1.

Meanwhile, the rotor core of the rotor 400 may be manufactured by combining a plurality of split cores or may be manufactured in the form of a single core composed of one barrel.

As shown in FIG. 3, the shaft 500 may be rotatably supported inside the housing 200 by a bearing 700.

The bus bar 600 may be placed on top of the stator 300.

Additionally, the bus bar 600 may be electrically connected to the coil 320 of the stator 300.

The bus bar 600 may include a bus bar body 610 and a plurality of terminals 620 disposed on the bus bar body 610. Here, the bus bar body 610 may be a ring-shaped mold formed through injection molding. Additionally, one side of each of the terminals 620 may be electrically connected to the coil 320 of the stator 300. Additionally, the other side of each terminal 620 exposed to the outside may be electrically connected to an external connector (not shown) to supply power.

As shown in FIG. 2 , the terminal 620 may pass through the second hole 112 . Additionally, a portion of the terminal 620 may be exposed to the outside.

Figure 10 is a diagram showing the assembly process of the rotor cover assembly of the motor according to the first embodiment.

Referring to FIG. 10, the motor 1 can be equipped with a rotor cover assembly with the stator 300 disposed inside the housing 200. Here, the rotor cover assembly includes a cover 100, a shaft 500 disposed in the center of the cover 100, a rotor 400 disposed on the outside of the shaft 500, and a bearing disposed on the outer peripheral surface of the shaft 500 ( 700). As shown in FIG. 3, the upper bearing 710 may be supported by the cover 100.

At this time, the jig 2 can be used as a fixing device to support the rotor cover assembly and adjust the shaft concentricity. Here, the jig 2 may include a first leg 3 and a second leg 4.

The end of the first leg 3 is disposed in the groove 122 to prevent the rotor cover assembly from moving horizontally. At this time, the second leg 4 may hold the upper side of the shaft 500.

Accordingly, the jig 2 can place the rotor cover assembly inside the housing 200 without hitting it.

Second embodiment

Figure 11 is a cross-sectional view of a motor according to the second embodiment. Here, FIG. 11 is a cross-sectional view taken along line A-A in FIG. 3.

Hereinafter, in describing the motor 1a according to the second embodiment, the same components as those of the motor 1 according to the first embodiment are indicated by the same reference numerals, and detailed description thereof will be omitted.

Referring to FIG. 11, the motor 1a according to the second embodiment includes a cover 100, a housing 200a disposed below the cover 100, a stator 300 disposed inside the housing 200a, A rotor 400 disposed inside the stator, a shaft 500 rotating together with the rotor 400, a bus bar 600 disposed on the upper side of the stator, a bearing 700 disposed on the outer peripheral surface of the shaft 500, and It may include a cap 800 disposed on the lower part of the housing 200a.

When comparing the motor 1a according to the second embodiment with the motor 1 according to the first embodiment, the motor 1a has a hole formed in the lower part of the housing 200a and has a hole formed in the lower part of the housing 200a to cover the hole. The difference is that it further includes a cap 800.

The housing 200a is disposed below the cover 100.

The housing 200a may be formed in a cylindrical shape. Additionally, the housing 200a can accommodate a stator 300, a rotor 400, etc. therein.

FIG. 12 is a perspective view showing the housing of the motor according to the second embodiment, and FIG. 13 is a cross-sectional view showing the housing of the motor according to the second embodiment.

Referring to FIGS. 12 and 13 , the housing 200a may include a housing plate portion 210a and a side wall portion 220 extending upward from the housing plate portion 210a. In addition, a second protrusion 221 protruding inward may be formed on the side wall portion 220.

The housing plate portion 210a may include a plate-shaped body 211a with a hole 213 formed in the center, and a raised portion 212 formed by a portion of the body 211a protruding.

At this time, the inside of the raised portion 212 may be arranged to be spaced apart from the outer peripheral surface of the hole 213 at a predetermined interval. Accordingly, the lower bearing 720 may be accommodated and supported in the second pocket portion P2.

Figure 14 is a diagram showing the assembly process of the rotor cover assembly of the motor according to the second embodiment.

Referring to FIG. 14, the motor 1a can be equipped with a rotor cover assembly with the stator 300 disposed inside the housing 200a. Here, the rotor cover assembly includes a cover 100, a shaft 500 disposed in the center of the cover 100, a rotor 400 disposed on the outside of the shaft 500, and a bearing disposed on the outer peripheral surface of the shaft 500 ( 700). As shown in FIG. 14, the upper bearing 710 may be supported by the cover 100.

At this time, the jig 2a can be used as a fixing device to support the rotor cover assembly and adjust the shaft concentricity. Here, the jig 2a may include a first leg 3 and a third leg 5.

The end of the first leg 3 is disposed in the groove 122 to prevent the rotor cover assembly from moving horizontally. And, the third leg 5 can hold the lower side of the shaft 500. At this time, the end of the third leg 5 may pass through the hole 213 and be coupled to the lower side of the shaft 500. For example, a coupling groove is formed at the bottom of the shaft 500, and the end of the third leg 5 may be coupled to the coupling groove.

Accordingly, while the jig 2a moves downward, the rotor cover assembly can be placed without hitting the inside of the housing 200a.

When using the third leg 5 that penetrates the hole 213 and engages the lower side of the shaft 500, it is easier in terms of shaft concentricity than when mounting the rotor cover assembly on the motor 1. In addition, since the hole 213 is sealed using the cap 800, the process of applying a sealing member can be omitted, thereby improving the productivity of the motor 1a.

The cap 800 may be arranged to cover the hole 213.

Figure 15 is a perspective view showing a cap of a motor according to the second embodiment.

Referring to FIG. 15 , the cap 800 may include a cap body 810 covering the hole 213 and a flange portion 820 protruding outward from an end of the cap body 810.

As shown in FIG. 15, the flange portion 820 is in contact with the lower surface of the raised portion 212 to further improve the sealing performance of the hole 213.

Although the present invention has been described above with reference to embodiments, those skilled in the art can make various modifications and modifications to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can change it. And, the differences related to these modifications and changes should be construed as being included in the scope of the present invention as defined in the appended claims.

1, 1a: motor
100: cover
110: cover plate portion 120: protrusion
122: Groove 124: First projection
200, 200a: housing
210: housing plate portion 220: side wall portion
221: Second protrusion
300: Stator
310: stator core 320: coil
330: insulator
400: rotor
500: shaft
600: Bus bar
700: Bearing
800: cap

Claims (10)

shaft;
a rotor coupled to the shaft;
A stator disposed outside the rotor;
A housing having an opening formed on one side; and
Including a cover covering the opening,
The housing includes a housing plate portion, a side wall portion protruding in the axial direction from the housing plate portion, and a housing protrusion protruding inward from the side wall portion,
The cover includes a cover plate portion and a protrusion extending axially from the cover plate portion,
The upper surface of the housing protrusion contacts the lower surface of the protrusion,
A motor in which the upper surface of the housing protrusion is disposed to overlap a portion of the area of the lower surface of the protrusion. According to paragraph 1,
The housing protrusions include at least three arranged along the circumferential direction at preset intervals,
A motor in which the upper surfaces of the housing protrusions are disposed at the same height. delete According to paragraph 1,
A motor in which the total area of the upper surface of the housing protrusion does not completely overlap with the total area of the lower surface of the protrusion. According to paragraph 1,
A motor in which the housing protrusion is formed to be inclined at a predetermined angle. According to paragraph 1,
The cover plate portion includes a first hole and a second hole,
The shaft is disposed in the first hole,
A motor in which terminals of a bus bar disposed on an upper side of the stator are disposed to penetrate the second hole. shaft;
a rotor coupled to the shaft;
A stator disposed outside the rotor;
A housing having an opening formed on one side; and
Including a cover covering the opening,
The housing includes a housing plate portion, a side wall portion protruding in the axial direction from the housing plate portion, and a housing protrusion protruding inward from the side wall portion,
The cover includes a cover plate portion and a protrusion extending axially from the cover plate portion,
The upper surface of the housing protrusion contacts the lower surface of the protrusion,
The cover plate portion includes a first hole and a second hole,
The shaft is disposed in the first hole,
The terminal of the bus bar disposed on the upper side of the stator is disposed to penetrate the second hole,
The second hole is a motor arranged non-point symmetrically with respect to the center (C). shaft;
a rotor coupled to the shaft;
A stator disposed outside the rotor;
a bus bar disposed above the stator;
A housing having an opening formed on one side; and
Including a cover covering the opening,
The housing includes a housing plate portion, a side wall portion protruding in the axial direction from the housing plate portion, and a housing protrusion protruding inward from the side wall portion,
The cover includes a cover plate portion and a protrusion extending axially from the cover plate portion,
The upper surface of the housing protrusion contacts the lower surface of the protrusion,
Further comprising a bus bar disposed on the upper side of the stator,
A motor in which a lower portion of the protrusion is disposed to overlap the bus bar in a radial direction. According to paragraph 1,
The housing plate portion includes a plate-shaped body and a ring-shaped ridge formed by a portion of the body protruding,
A pocket portion is formed inside the ridge by the ridge,
The pocket portion is a motor that accommodates a lower bearing disposed on the outer peripheral surface of the shaft. According to clause 9,
A hole is formed in the center of the main body,
A motor further comprising a cap disposed to cover the hole.