KR20230044376A - Motor - Google Patents

Abstract

An embodiment is a shaft; a rotor coupled to the shaft; a stator disposed outside the rotor; a housing accommodating the rotor and the stator and having an opening formed at one side; and a cover covering the opening, wherein the cover includes a cover plate portion; and a protrusion extending in an axial direction from the cover plate, 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 received by a conductor in a magnetic field. Recently, as the use of motors has expanded, the role of motors is becoming more important. In particular, as the electrification of automobiles is rapidly progressing, the demand for motors applied to steering systems, braking systems, and design systems is greatly increasing.

Typically, a motor is provided with a shaft formed to be rotatable, a rotor coupled to the shaft, and a stator fixed inside the housing, and the stator is installed with a gap along the circumference of the rotor. In addition, a coil forming a rotating magnetic field is wound around the stator to induce electrical interaction with the rotor, thereby inducing rotation of the rotor. As the rotor rotates, the shaft rotates to generate driving force.

And, a bus bar electrically connected to the coil is disposed at the upper end of the stator. The bus bar generally includes a ring-shaped bus bar housing and a bus bar terminal coupled to the bus bar housing to which a coil is connected. Typically, such a bus bar is formed into a bus bar terminal by press-processing a sheet metal such as a copper plate.

On the other hand, the sealing performance of the motor is influenced by the cover and the housing coupled to form the outer shape of the motor. Here, the center hole of the housing may be deleted in order to satisfy IP rating for sealing.

However, a bearing may be damaged during the process of assembling the rotor inside the stator disposed in a housing without a center hole.

Hereinafter, with reference to FIG. 1, the above-described damage of the bearing will be reviewed.

1 is a view showing the assembly of a rotor cover assembly.

Referring to FIG. 1 , the rotor cover assembly is assembled to a housing 20 in which a stator 10 is disposed.

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 an outer circumferential surface of the shaft 40. ) may be included.

Here, the bearing 60 may include an upper bearing 61 disposed above the shaft 40 and a lower bearing 62 disposed below the shaft 40 according to the arrangement position. As shown in FIG. 1 , the upper bearing 61 may be supported by the cover 30 .

However, when assembling the rotor cover assembly to the housing 20 in which the stator 10 is disposed, the lower bearing 62 of the rotor cover assembly is damaged by the attractive force between the magnetized rotor 50 and the stator 10. A phenomenon of colliding with the protrusion 21 of the housing 20 occurs. Accordingly, there is a problem that the lower bearing 62 is damaged.

Provided is a motor capable of securing sealing performance while preventing damage to bearings when assembling a rotor inside a stator.

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

According to the embodiment, the task is a shaft; a rotor coupled to the shaft; a stator disposed outside the rotor; a housing accommodating the rotor and the stator and having an opening formed at one side; and a cover covering the opening, wherein the cover includes a cover plate portion; and a protrusion extending in an axial direction from the cover plate portion, and achieved by a motor having at least three grooves formed in the protrusion.

Here, the groove may be spaced apart from the end of the protruding part by a first predetermined distance d1.

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

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

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

Also, an inner surface of the first protrusion may be inclined at a predetermined angle θ with respect to an axial direction.

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

In addition, the housing includes a housing plate portion; and a sidewall portion protruding in an axial direction from the housing plate portion, wherein a second protrusion protruding inward is formed on the sidewall portion.

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

The raised portion may include a corner formed of a curved surface having a predetermined curvature.

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

Also, an upper surface of the second protrusion may contact a lower surface of the protrusion.

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

To this end, the motor may install the rotor inside the housing without damaging the bearing by using a groove formed on the outer circumferential surface of the cover.

In this case, sealing performance of the motor may be improved by deleting a hole on the bottom surface of the housing.

In addition, since the application of a separate sealing member is not required as the hole is deleted, the mass productivity of the motor can be improved. That is, when applying the sealing member, since the curing time for the sealing member is required, the coating process for the sealing member can be omitted, thereby improving the productivity of the motor.

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

Since the present invention can make various changes and have various embodiments, specific embodiments are 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 modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as second and first may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a second element may be termed a first element, and similarly, a first element may be termed a second element, without departing from the scope of the present invention. The terms and/or include any combination of a plurality of related recited items or any of a plurality of related recited items.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

In the description of the embodiment, in the case where one component is described as being formed “on or under” another component, the upper (above) or lower (below) (on or under) includes both those formed by direct contact between two components or by indirectly placing one or more other components between the two components. In addition, when expressed as 'on or under', it may include the meaning of not only the upward direction but also the downward direction based on one component.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, it should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings, but the same or corresponding components regardless of reference numerals are given the same reference numerals, and overlapping descriptions thereof will be omitted.

Example 1

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

1 and 2, the motor 1 according to the first embodiment includes a cover 100, a housing 200 disposed under the cover 100, and a stator disposed inside the housing 200. 300, a rotor 400 disposed inside the stator, a shaft 500 rotating together with the rotor 400, a bus bar 600 disposed above the stator, and a bearing disposed on the outer circumferential surface of the shaft 500 (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 of the shaft 500 according to the arrangement position.

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

Accordingly, an accommodation space may be formed therein by combining the cover 100 and the housing 200 . And, as shown in FIG. 3 , the stator 300, the rotor 400, and the shaft 500 may be disposed in the accommodation space.

The cover 100 may be disposed on an opening surface of the housing 200, that is, an upper portion of the housing 200 to cover the opening of the housing 200.

4 is a perspective view showing a cover of the motor according to the first embodiment, FIG. 5 is a side view showing the cover of the motor according to the first embodiment, and FIG. 6 is a bottom view showing the cover of the motor according to the first embodiment. 7 is a cross-sectional view taken along line BB of 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 from the cover plate portion 110 in an axial direction. Here, the cover plate portion 110 and the protruding portion 120 may be integrally formed.

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

A first hole 111 formed in the center and a plurality of second holes 112 may be formed in the cover plate unit 110 . Also, the cover plate unit 110 may include a first pocket unit P1 formed so that the center thereof is depressed downward. Here, the first pocket portion P1 may be referred to as a cover pocket portion.

A shaft 500 may be disposed inside the first hole 111 . At this time, an 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 unit 110 may support the upper bearing 710 .

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

The protrusion 120 may protrude downward from the lower surface of the cover plate unit 110 . For example, the protruding portion 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 protruding portion 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 concavely formed on the outer circumferential surface 121 of the protrusion 120 . The number of the grooves 122 may be at least three at predetermined intervals to prevent the cover 100 from moving horizontally, but is not necessarily limited thereto.

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

That is, since the grooves 122 are disposed on the same horizontal plane, they may be disposed rotationally symmetrically with respect to the center C of the cover 100 . Accordingly, the fixing device applies a constant force to the outer circumferential surface 121 of the cover 100 through the groove 122 to prevent the cover 100 from moving horizontally.

Referring to FIG. 7 , the grooves 122 may be spaced apart from the ends of the protrusions 120 by a first predetermined interval d1. In addition, the groove 122 may be disposed at a predetermined second distance d2 at the corner where the cover plate 110 and the protrusion 120 meet.

At this time, the first interval d1 is greater than the second interval 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 may be formed by pressing one area of the protrusion 120 in a radial direction. At this time, a first protrusion 124 may be formed on the inner circumferential surface 123 of the protrusion 120 by the pressing.

The first protrusion 124 may protrude inward from the inner circumferential surface 123 of the protrusion 120 .

As shown in FIG. 7 , the inner surface 124a of the first protrusion 124 may be inclined at a predetermined angle θ with respect to the axial direction. In this case, the inner surface 124a of the first protrusion 124 may 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 may be further directed toward the cover plate 110 .

The housing 200 is disposed under the cover 100 .

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

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 sidewall 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 protruding a part of the body 211 .

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 body 211 . As shown in FIG. 9 , the housing plate portion 210 may be formed in a concave-convex shape by the raised portion 212 .

Since the raised portion 212 is radially spaced apart from the center C of the body 211 , a second pocket portion P2 may be formed inside the raised portion 212 . Here, the second pocket portion P2 may be referred to as a housing pocket portion.

Also, the lower bearing 720 may be accommodated in the second pocket portion P2 . At this time, a washer may be disposed under 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 corner among corners of the raised portion 212 .

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

The sidewall portion 220 may extend in an axial direction from an upper surface of the housing plate portion 210 . In this case, 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 circumferential surface 222 of the side wall portion 220 .

In this case, the second protrusions 221 may be disposed along the circumferential direction at preset intervals. Accordingly, the top 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 end side of the protrusion 120 . Accordingly, the upper surface 221a of the second protrusion 221 serves as a position guide to which the cover 100 is seated to a preset position.

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

The stator 300 may be supported on an inner circumferential 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 having an outer circumferential surface of the wire 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 formed of a single core or a plurality of split cores may be combined.

The stator core 310 may be formed in a form in which a plurality of plates in the form of thin steel plates are stacked on each other, but is not necessarily 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 tooth may be disposed to protrude from the yoke in a radial direction (x direction) based on the center C of the stator core 310. And, the plurality of teeth may be disposed spaced apart from each other along the circumferential direction of the yoke. Accordingly, slots may be formed between the respective teeth.

Meanwhile, the tooth may be disposed to face the magnet of the rotor 400. Then, 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 where the insulator 330 is disposed.

Meanwhile, when current is supplied to the coil 320, an electrical interaction with the magnet is induced, so that the rotor 400 may 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 disposed inside the stator 300. And, the shaft 500 may be coupled to the center.

The rotor 400 may be configured by coupling a magnet (not shown) to a rotor core (not shown). For example, the rotor 400 may be configured in a type in which a magnet is disposed on an outer circumferential surface of the rotor core.

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

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 of 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 a single cylinder.

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

The bus bar 600 may be disposed above the stator 300 .

Also, 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 molded product formed through injection molding. In addition, one side of each of the terminals 620 may be electrically connected to the coil 320 of the stator 300 . In addition, the other side of each of the terminals 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 . Also, a portion of the terminal 620 may be exposed to the outside.

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

Referring to FIG. 10 , the motor 1 may mount the rotor cover assembly in a state where the stator 300 is 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 outside the shaft 500, and a bearing disposed on an outer circumferential surface of the shaft 500 ( 700) may be included. As shown in FIG. 3 , the upper bearing 710 may be supported by the cover 100 .

At this time, the jig 2 may be used as a support for the rotor cover assembly and a fixing device for matching the concentricity of the shaft. 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 colliding with it.

Second embodiment

11 is a cross-sectional view of a motor according to a second embodiment. Here, FIG. 11 is a cross-sectional view taken along line A-A of 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 denoted 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 under 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 above the stator, a bearing 700 disposed on an outer circumferential surface of the shaft 500, and A cap 800 disposed under the housing 200a may be included.

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 covers the hole. The difference is that the cap 800 is further included.

The housing 200a is disposed under the cover 100.

The housing 200a may be formed in a cylindrical shape. Also, the housing 200a may accommodate the stator 300 and the rotor 400 therein.

12 is a perspective view showing a housing of a motor according to a second embodiment, and FIG. 13 is a cross-sectional view showing a housing of a motor according to a 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 main body 211a having a hole 213 in the center thereof and a raised portion 212 formed by protruding a part of the main body 211a.

In this case, the inner side of the raised portion 212 may be spaced apart from the outer circumferential 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 .

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

Referring to FIG. 14 , the rotor cover assembly may be mounted on the motor 1a in a state where the stator 300 is 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 outside the shaft 500, and a bearing disposed on an outer circumferential surface of the shaft 500 ( 700) may be included. As shown in FIG. 14 , the upper bearing 710 may be supported by the cover 100 .

At this time, a jig 2a may be used as a support for the rotor cover assembly and a fixing device for adjusting the concentricity of the shaft. 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. Also, the third leg 5 may 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 may be formed at the lower end of the shaft 500, and an end portion of the third leg 5 may be coupled to the coupling groove.

Accordingly, while the jig 2a moves downward, the rotor cover assembly may be disposed without colliding with the inside of the housing 200a.

In the case of using the third leg 5 coupled to the lower side of the shaft 500 through the hole 213, it is easier in terms of shaft concentricity than in the case of mounting the rotor cover assembly in the motor 1. In addition, since the hole 213 is sealed using the cap 800, the application process of the sealing member can be omitted, thereby improving the productivity of the motor 1a.

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

15 is a perspective view showing a cap of a motor according to a 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 may contact the lower surface of the raised portion 212 to further improve sealing performance of the hole 213 .

Although the above has been described with reference to the embodiments of the present invention, those skilled in the art can variously modify and modify the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. You will understand that it can be changed. And, it should be construed that the differences related to these modifications and changes are included in the scope of the present invention, which is defined in the appended claims.

1, 1a: motor
100: cover
110: cover plate portion 120: protrusion
122: groove 124: first protrusion
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 with an opening formed on one side; and
A cover covering the opening;
The cover includes a cover plate portion and a protrusion extending in an axial direction from the cover plate portion,
A first protrusion is formed on the inner surface of the protrusion,
The first protrusion is a motor disposed spaced apart from the stator disposed inside the housing. According to claim 1,
At least three grooves are formed in the protrusion,
A motor in which the groove is formed to correspond to the first protrusion. According to claim 2,
The grooves are spaced apart from the ends of the protrusions at a first predetermined interval d1, and the grooves are disposed at a predetermined second interval d2 at the corner where the cover plate and the protrusions meet,
The first distance d1 is greater than the second distance d2. According to claim 1,
The cover plate includes a first hole and a second hole,
The shaft is disposed in the first hole,
A motor disposed so that a terminal of a bus bar disposed above the stator passes through the second hole. According to claim 1,
Further comprising a bus bar disposed above the stator,
A lower portion of the protrusion is disposed to overlap the bus bar in a radial direction. According to claim 1,
The inner surface of the first protrusion is formed to be inclined at a predetermined angle (θ) based on the axial direction. According to claim 1,
the housing
housing plate portion; and
A side wall portion protruding in an axial direction from the housing plate portion,
A second protrusion protruding inward is formed on the side wall portion,
The upper surface of the second protrusion is in contact with the lower surface of the protruding motor. According to claim 7,
the housing plate
plate-shaped body; and
A part of the main body includes a ring-shaped ridge formed by protruding,
A pocket portion is formed inside the raised portion by the raised portion,
The pocket portion accommodates a lower bearing disposed on an outer circumferential surface of the shaft. According to claim 8,
The motor comprising a corner formed of a curved surface having a predetermined curvature. According to claim 8,
A hole is formed in the center of the body,
A motor further comprising a cap disposed to cover the hole.

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