KR20230109860A - Motor - Google Patents

Abstract

Disclosed in an embodiment is a motor, comprising: a housing having an opening; a cover disposed to cover the opening; a stator disposed inside the housing; a rotor disposed inside the stator; a shaft coupled to the rotor; and a bearing disposed on an outer circumferential surface of the shaft, wherein the cover comprises a body having a hole in the center, a first protrusion portion axially extending from the body to form a bearing pocket, and a stopper disposed in the bearing pocket and supporting the bearing, the stopper comprises a plate portion and a sidewall portion, and an incision formed in the plate portion is coupled to a protrusion formed in the body. Accordingly, the motor can prevent slipping of the bearing through an anti-slip structure formed in the stopper supporting the bearing.

Description

motor {MOTOR}

The present invention 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.

The motor may include a housing, a cover disposed in the opening of the housing, a shaft, a rotor installed on an outer circumferential surface of the shaft, a stator disposed corresponding to the rotor, a bus bar disposed above the stator, and a bearing disposed on an outer circumferential surface of the shaft.

Here, the bearing is installed in a housing or a cover to rotatably support the shaft. In this case, the bearing may be divided into a housing bearing disposed in the housing and a cover bearing disposed in the cover.

A problem in which the bearing is separated from the housing or the cover may occur due to vibration caused by driving of the motor.

In addition, there is a problem that slip of the bearing occurs due to driving of the motor.

Accordingly, there is a demand for development of a structurally improved motor to prevent separation and slip of the bearing.

Embodiments provide a motor including a slip prevention structure formed on a stopper supporting a bearing, and a cover to which a separation prevention structure is applied to prevent separation of the stopper.

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.

The above problem is a housing formed with an opening; a cover disposed to cover the opening; a stator disposed inside the housing; a rotor disposed inside the stator; a shaft coupled to the rotor; And a bearing disposed on an outer circumferential surface of the shaft, wherein the cover includes a body having a hole in the center, a first protrusion extending axially from the body to form a bearing pocket, and a stopper disposed in the bearing pocket to support the bearing, the stopper including a plate portion and a side wall portion, and the cutout formed in the plate portion is achieved by a motor to which the protrusion formed in the body is coupled.

Here, the protrusion may be formed to protrude in an axial direction inside the bearing pocket.

The protrusion and the plate portion may contact the outer ring of the bearing.

Also, the friction coefficient of the protrusion may be different from the friction coefficient of the plate part.

In addition, the cover may further include a second protrusion formed to protrude inward from an end of the first protrusion, and the second protrusion may be disposed to overlap the side wall portion in an axial direction.

Preferably, the second protrusion may further extend in a radial direction so as to support the outer ring of the bearing.

Meanwhile, the motor may further include a substrate coupled to the cover, and an upper surface of the substrate may contact the second protrusion.

A hole may be formed in the center of the substrate, and an inner radius of the sidewall portion may be greater than a radius of the hole.

The motor may further include a sensing magnet assembly coupled to the shaft, and a sensor may be disposed on the board to face the sensing magnet of the sensing magnet assembly.

Meanwhile, the integrally formed body, the first protrusion, and the protrusion may be formed of a synthetic resin material, and the stopper may be formed of a metal material.

In addition, the stopper may be disposed in the bearing pocket through an insert injection method.

The above problem is a housing formed with an opening; a cover disposed to cover the opening; a stator disposed inside the housing; a rotor disposed inside the stator; a shaft coupled to the rotor; And a bearing disposed on an outer circumferential surface of the shaft, wherein the cover includes a body having a hole in the center, a first protrusion extending axially from the body to form a bearing pocket, a second protrusion extending radially from an end of the first protrusion, and a stopper disposed in the bearing pocket to support the bearing, the stopper including a plate portion and a sidewall portion, and the second protrusion portion is achieved by a motor arranged to overlap the sidewall portion in an axial direction.

Here, the motor may further include a substrate coupled to the cover, and an upper surface of the substrate may contact the second protrusion.

The motor may further include a substrate coupled to the cover, a hole may be formed in a center of the substrate, and an inner radius of the side wall portion may be greater than a radius of the hole.

In addition, the bearing disposed in the housing may be supported by a stepped portion of the shaft.

The embodiment can prevent the bearing from slipping through an anti-slip structure formed on a stopper supporting the bearing.

In an embodiment, the stopper may be prevented from being separated by using a separation preventing structure formed on the cover. Accordingly, separation of the bearing coupled to the stopper can be prevented.

In the embodiment, the separation of the bearing can be prevented by using a substrate in addition to the separation prevention structure formed on the cover.

Various but beneficial advantages and effects of the embodiment are not limited to the above-described content, and may be more easily understood in the process of describing specific embodiments of the embodiment.

1 is a perspective view showing a motor according to an embodiment,
2 is a cross-sectional view showing a motor according to an embodiment,
3 is a perspective view showing a cover, a substrate, and a bearing of a motor according to an embodiment;
4 is a bottom perspective view showing a cover, a substrate, and a bearing of a motor according to an embodiment;
5 is an exploded perspective view showing a cover, a substrate, and a bearing of a motor according to an embodiment;
6 is a cross-sectional view showing a cover, a substrate, and a bearing of a motor according to an embodiment;
7 is a bottom perspective view of a cover disposed on a motor according to an embodiment;
8 is a view showing protrusions formed on a cover disposed on a motor according to an embodiment;
9 is a perspective view showing a stopper of a cover disposed on a motor according to an embodiment;
10 is a bottom perspective view showing a stopper of a cover disposed on a motor according to an embodiment;
11 is a cross-sectional view showing a modified example of a motor cover according to an embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the described examples, but may be implemented in a variety of different forms, and one or more of the components may be selectively combined or replaced between embodiments.

In addition, when it is described as being formed or disposed "upper (above) or lower (below)" of each component, the upper (above) or lower (below) includes not only a case where two components are in direct contact with each other, but also a case where one or more other components are formed or disposed between the two components. In addition, when expressed as "up (up) or down (down)", it may include the meaning of not only an upward direction but also a downward direction based on one component.

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.

1 is a perspective view showing a motor according to an embodiment, FIG. 2 is a cross-sectional view showing a motor according to an embodiment, FIG. 3 is a perspective view showing a cover, a board, and a bearing of a motor according to an embodiment, FIG. 4 is a bottom perspective view showing a cover, a board, and a bearing of a motor according to an embodiment, FIG. 5 is an exploded perspective view showing a cover, a board, and a bearing of a motor according to an embodiment, and FIG. .

Here, the X direction shown in FIGS. 1 and 2 may mean a radial direction, and the Y direction may mean an axial direction. Also, the axial direction and the radial direction may be perpendicular to each other. Further, a direction along a circle having a radius in a radial direction based on an axis center may be referred to as a circumferential direction. Also, reference numeral 'C' shown in FIG. 1 may mean a rotation center (axis center).

1 and 2, the motor according to the embodiment includes a housing 100 having an opening on one side, a cover 200 disposed in the opening, a stator 300 disposed inside the housing 100, a rotor 400 disposed inside the stator 300, a shaft 500 coupled to the rotor 400, and a bus bar terminal 600 disposed above the stator 300. ), a sensing magnet assembly 700 coupled to the shaft 500, a substrate 800 coupled to the cover 200, and a bearing disposed on an outer circumferential surface of the shaft 500. Here, the inner side may mean a direction disposed toward the rotation center C of the motor based on the radial direction, and the outer side may mean a direction opposite to the inner side.

The bearings may include a first bearing 900A disposed on the housing 100 and a second bearing 900B disposed on the cover 200 . In addition, each of the first bearing 900A and the second bearing 900B may include an outer race 910, an inner race 920, and a ball 930 disposed between the outer race 910 and the inner race 920. In this case, the first bearing 900A may be called a housing bearing, and the second bearing 900B may be called a cover bearing.

There is a possibility that the bearing may come off or slip due to the driving of the motor. The motor according to the embodiment has a slip prevention structure and a separation prevention structure to prevent the bearing from slipping or coming off.

In particular, when the second bearing 900B is separated, the second bearing 900B may damage the stator 300, etc., and the motor according to the embodiment implements a double separation prevention structure to secure stability. For example, separation of the second bearing 900B can be prevented through the shape and arrangement of the second protrusion 260 formed on the cover 200 and the substrate 800 .

The housing 100 and the cover 200 may form the exterior of the motor. Also, an accommodation space may be formed therein by combining the housing 100 and the cover 200 . Accordingly, as shown in FIG. 1 , the stator 300, the rotor 400, the shaft 500, the bus bar terminal 600, and the like may be disposed in the accommodation space.

The housing 100 may be formed in a tubular shape and may form an outer shape of the motor. Also, the housing 100 may accommodate the stator 300 and the rotor 400 therein. At this time, the shape or material of the housing 100 may be variously changed. For example, the housing 100 may be formed of a metal material such as aluminum that can withstand high temperatures.

The housing 100 may include a groove concave downward to support the first bearing 900A. Here, the groove may be called a bearing pocket portion or a housing pocket portion.

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

7 is a bottom perspective view of a cover disposed on a motor according to an embodiment, and FIG. 8 is a view showing protrusions formed on a cover disposed on a motor according to an embodiment.

2 to 8 , the cover 200 may include a body 210 having a hole 211a formed in the center, a first protrusion 220 extending in an axial direction from the body 210 to form a bearing pocket, a stopper 230 disposed in the bearing pocket to support the second bearing 900B, and a terminal 240 disposed in the body 210. Here, the bearing pocket formed in the cover 200 may be referred to as a cover pocket. And, the stopper 230 may be called a bearing holder.

In addition, the cover 200 may further include a protrusion 250 provided as a slip prevention structure. Here, the protrusion 250 provided as an anti-slip structure may be referred to as a first protrusion or an anti-slip protrusion.

In addition, the cover 200 may further include a second protrusion 260 provided as a separation preventing structure.

Here, the body 210, the first protrusion 220 and the second protrusion 260 may be integrally formed. Also, the body 210, the first protrusion 220, and the second protrusion 260 may be formed of a synthetic resin material such as resin. At this time, the stopper 230 and the terminal 240 may be formed of a metal material different from that of the body 210 .

The body 210 may include a body portion 211 and a connector portion 212 disposed in a radial direction of the body portion 211 . Here, the body part 211 and the connector part 212 may be integrally formed. In addition, the body part 211 and the connector part 212 may be molded products formed through injection molding of an insulating material. For example, the body part 211 and the connector part 212 may be formed of a synthetic resin material such as resin in consideration of the stopper 230 and the terminal 240 disposed inside by injection molding.

The body part 211 may be disposed on an opening surface of the housing 100, that is, an upper portion of the housing 100 to cover the opening of the housing 100. At this time, the body part 211 may be formed in a cylindrical shape.

An accommodating space may be formed inside the connector part 212 , and an end portion of the terminal 240 may be exposed in the accommodating space. In addition, a device for applying external power, such as a connector, may be connected to the accommodation space.

The first protrusion 220 may protrude in an axial direction from the lower surface of the body portion 211 so that a space is formed therein. Also, the space formed by the first protrusion 220 may be disposed to communicate with the hole 221a. Accordingly, a bearing pocket in which the second bearing 900B is disposed may be formed inside the first protrusion 220 .

The stopper 230 may be disposed in the bearing pocket part through an insert injection method.

The stopper 230 may be disposed in the bearing pocket to support the second bearing 900B. At this time, the stopper 230 is formed of a material different from that of the body 210 to prevent the second bearing 900B from slipping or being separated from the cover 200 .

9 is a perspective view showing a stopper of a cover disposed on a motor according to an embodiment, and FIG. 10 is a bottom perspective view illustrating a stopper of a cover disposed on a motor according to an embodiment.

Referring to FIGS. 9 and 10 , the stopper 230 may be formed in a tubular shape with an opening at one side. Also, the second bearing 900B may be coupled to the inner side of the stopper 230 . At this time, the stopper 230 is formed of a metal material and can prevent the second bearing 900B from slipping or coming off.

The stopper 230 may include a plate portion 231 and a side wall portion 232 .

The plate portion 231 may be formed in a disk shape in which a hole 231a is formed in the center in an axial direction. At this time, the plate portion 231 may contact the lower surface of the body 210 .

In addition, a cutout 231b to which the protrusion 250 is coupled may be formed in the plate portion 231 . Here, the cutout 231b may be formed in a shape corresponding to the protrusion 250 .

A plurality of cutouts 231b may be formed in the plate part 231 so as to be spaced apart from each other in a circumferential direction.

Also, the cutout 231b may be formed to pass through the plate portion 231 in an axial direction. For example, the cutout 231b may be a hole penetrating the plate portion 231 in an axial direction.

In addition, the cutout 231b may be provided as a groove concave in a radial direction. Also, the groove may be formed to communicate with the bearing pocket in a radial direction.

Meanwhile, the coupling of the cutout 231b and the protrusion 250 implements the anti-slip structure of the stopper 230 . Accordingly, the slip of the second bearing 900B coupled to the stopper 230 is also prevented by the coupling.

One surface of the plate portion 231 and an end surface of the protrusion 250 may be disposed on the same radius to contact the second bearing 900B. In detail, by the coupling, the plate portion 231 and the protrusion 250 may support the outer ring 910 of the second bearing 900B. In this case, the friction coefficient of the plate part 231 and the friction coefficient of the protrusion 250 may be different.

The side wall portion 232 may be formed to extend in an axial direction from an outer circumferential surface of the plate portion 231 .

Also, an outer circumferential surface of the side wall portion 232 may contact the first protruding portion 220 . For example, the side wall portion 232 may be disposed to overlap with the first protrusion 220 in the radial direction and supported by the first protrusion 220 .

In addition, the side wall portion 232 may be formed to have a predetermined inner radius R1 based on the center C.

A plurality of terminals 240 may be disposed on the body 210 through an injection molding method. In this case, an end of the terminal 240 may be disposed to be exposed to the outside.

As shown in FIG. 1 , one end of the terminal 240 may be disposed to be exposed to the upper side of the cover 200 and may be electrically connected to the bus bar terminal 600 by welding or the like.

As shown in FIGS. 2 and 6 , the other end of the terminal 240 may be disposed in an accommodation space of the connector part 212 . Also, another end of the terminal 240 may be coupled to the substrate 800 .

Accordingly, some of the terminals 240 are electrically connected to the stator 300 via the bus bar terminal 600 so that external power can be applied to the stator 300 . Also, another part of the terminals 240 may be electrically connected to the substrate 800 .

The protrusion 250 may be formed in the bearing pocket. At this time, the protrusion 250 may be formed in a shape corresponding to the cutout 231b.

As shown in FIG. 8 , the protrusion 250 of the cover 200 may be formed inside the bearing pocket formed by the first protrusion 220 . For example, the protrusion 250 may be formed to protrude from the body 210 in an axial direction.

Accordingly, the protrusion 250 may be coupled to the cutout 231b to prevent the stopper 230 from slipping.

The second protrusion 260 may be formed to protrude inward from an end of the first protrusion 220 . The second protrusion 260 may be disposed to overlap the sidewall portion 232 in the axial direction and may contact a lower end portion of the sidewall portion 232 . Here, the second protrusion may be called a flange portion, a separation preventing portion, or a separation preventing protrusion.

Accordingly, the second protrusion 260 can support the end of the side wall portion 232 to prevent the stopper 230 from coming off, and the second bearing 900b coupled to the stopper 230 can also be prevented from coming off.

In addition, the second protrusion 260 is formed in an annular shape as an example, but is not necessarily limited thereto. For example, the second protrusion 260 may be a plurality of protrusions spaced apart from each other along the circumferential direction.

Meanwhile, the upper surface of the substrate 800 may contact the lower surface of the second protrusion 260 . At this time, since the substrate 800 is coupled to the cover 200 , the substrate 800 may support the second protrusion 260 .

11 is a cross-sectional view showing a modified example of a motor cover according to an embodiment.

Referring to FIG. 11 , the second protrusion 260 may further extend in a radial direction. Accordingly, the second protrusion 260 may support the outer ring 910 of the second bearing 900b. In this case, the second protrusion 260 may be disposed to overlap the side wall portion 232 and the outer ring 910 of the second bearing 900b in the axial direction.

That is, the outer ring 910 of the second bearing 900b is disposed between the plate portion 231 and the second protrusion 260 to more firmly prevent the second bearing 900b from being separated.

Referring to FIG. 2 , the stator 300 may include a stator core 310, an insulator 320 disposed on the stator core 310, and a coil 330 wound around the insulator 320.

A coil 330 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 may be formed by combining a plurality of split cores.

The stator core 310 may be formed in a form in which a plurality of plates in the form of thin steel plates are mutually stacked, but is not necessarily limited thereto. For example, the stator core 310 may be formed as a single product.

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

The plurality of teeth may be spaced apart from each other along the circumferential direction of the yoke. Accordingly, a slot, which is a space in which the coil 330 is wound, may be formed between the teeth.

Meanwhile, the teeth of the stator 300 may be arranged to have an air gap with the rotor 400 . Here, the air gap may be a distance between the tooth and the magnet 412 in a radial direction.

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

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

The rotor 400 rotates through electrical interaction with the stator 300. At this time, the rotor 400 may be rotatably disposed on the stator 300 .

Referring to FIG. 2 , the rotor 400 may include a rotor core 410 and a plurality of magnets 420 disposed outside the rotor core 410 . Here, the rotor 400 may be formed of a surface permanent magnet (SPM) type in which a magnet 420 is attached to the surface of the rotor core 410, but is not necessarily limited thereto. At this time, the magnets 420 may be disposed on the rotor core 410 to be spaced apart at predetermined intervals along the circumferential direction with respect to the center (C).

In addition, the rotor 400 may further include a can protecting the rotor core 410 and the magnet 420 . At this time, the can may be disposed to cover the rotor core 410 to which the magnet 420 is coupled.

The rotor core 410 may be implemented in a shape in which a plurality of plates in the form of thin steel plates are stacked or in the form of a single cylinder.

Also, the rotor core 410 may be formed in a cylindrical shape. Here, a hole to which the shaft 500 is coupled may be formed at the center of the rotor core 410 .

The magnet 420 forms a rotating magnetic field with the coil 330 of the stator 300. Accordingly, the rotor 400 rotates due to the electrical interaction between the coil 330 and the magnet 420, and the shaft 500 rotates in conjunction with the rotation of the rotor 400, thereby generating the driving force of the motor 1. Here, the magnet 420 of the rotor 400 may be called a drive magnet.

A plurality of magnets 420 may be spaced apart from each other along the circumferential direction on the outer circumferential surface of the rotor core 410 .

The shaft 500 may be rotatably disposed inside the housing 100 by the bearings 900A and 900B. Also, the shaft 500 may rotate together with the rotation of the rotor 400 .

In addition, the shaft 500 may be coupled to a hole formed in the center of the rotor core 410 in a press-fitting manner.

In addition, the shaft 500 may include a stepped portion 510 formed on an outer circumferential surface. Here, the stepped portion 510 supports the inner rings 920 of the bearings 900A and 900B to prevent separation of the bearings 900A and 900B. At this time, the outer circumferential surface of the shaft 500 may be formed by a first outer circumferential surface and a second outer circumferential surface formed to have different radii. That is, the stepped portion 510 may be formed due to a difference in radius between the first outer circumferential surface and the second outer circumferential surface of the shaft 500 . Here, the rotor 400 may be disposed on the first outer circumferential surface.

The bus bar terminal 600 may be disposed above the stator 300. Here, the terminal 620 may be formed of a metal material.

In addition, the bus bar terminal 600 may be electrically connected to the coil 330 of the stator 300.

In addition, the bus bar terminal 600 may be electrically connected to the terminal 240 disposed on the cover 200 .

As shown in FIG. 1, since the end of the bus bar terminal 600 is exposed to the outside through the cover 200 and can be electrically connected to the terminal 240, the coil 330 and an external power source can be connected.

The sensing magnet assembly 700 is coupled to the shaft 500 to interlock with the rotation of the rotor 400 so that the position of the rotor 400 is detected.

Referring to FIG. 2 , the sensing magnet assembly 700 may include a sensing plate 710 and a sensing magnet 720 . Here, the sensing plate 710 and the sensing magnet 720 may be coaxially coupled.

The sensing plate 710 may be formed of a disc-shaped metal material. Also, a sensing magnet 720 may be coupled to an upper surface of the sensing plate 710 . Also, the sensing plate 710 may be coupled to the shaft 500 . Here, a hole through which the shaft 500 passes may be formed in the sensing plate 710 .

The sensing magnet 720 may include a main magnet disposed in a circumferential direction adjacent to a hole of the sensing plate 710 forming an inner circumferential surface and a sub magnet formed at an edge of the sensing plate 710 .

The main magnet may be arranged identically to the magnet 420 of the rotor 400 of the motor.

The sub magnet may be formed to have more poles than the main magnet. Therefore, it is possible to divide and measure the rotational angle of the rotor 400 more minutely through the sub-magnet, and accordingly, the motor can be driven more smoothly.

The sensor 810 disposed on the substrate 800 detects the magnetic force of the sensing magnet 720 installed to be rotatably interlocked with the rotor 400 to determine the current position of the rotor 400, thereby detecting the rotation of the shaft 500. Here, the substrate 800 may be a printed circuit board (PCB).

The sensor 810 may sense the magnetic force of the sensing magnet 720 . For example, the sensor may be provided as a Hall IC, and the sensor may detect a change in the N pole and S pole of the sensing magnet 720 to generate a sensing signal.

Meanwhile, the substrate 800 may include a first hole 820 formed for disposing the shaft 500 and at least one second hole 830 formed for coupling with the cover 200 .

The first hole 820 may be formed in the center of the substrate 800 . Also, the shaft 500 may be disposed through the first hole 820 .

Also, the hole 820 may be formed to have a predetermined radius R2. In this case, the radius R2 may be smaller than the inner radius R1 of the side wall portion 832 . Accordingly, the substrate 800 may support the second protrusion 260 to prevent the second bearing 900B from being separated.

A protrusion 211b protruding in an axial direction from the body portion 211 may be coupled to the second hole 830 . At this time, the substrate 800 may be fixed to the cover 200 through a thermal fusion method in which heat is applied to the end of the protrusion 211b. Here, the protrusion 211b coupled to the substrate 800 may be referred to as a second protrusion or a coupling protrusion.

The motor according to the embodiment may be used in various devices such as vehicles or home appliances.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be understood that it can be changed.

100: housing
200: cover
210: body 220: first protrusion
230: stopper 240: terminal
250: protrusion 260: second protrusion
300: stator
400: rotor
500: shaft
600: bus bar terminal
700: sensing magnet assembly
800: substrate
900A, 900B: Bearing

Claims (15)

an apertured housing;
a cover disposed to cover the opening;
a stator disposed inside the housing;
a rotor disposed inside the stator;
a shaft coupled to the rotor; and
Including a bearing disposed on the outer circumferential surface of the shaft,
The cover includes a body having a hole in the center, a first protrusion extending axially from the body to form a bearing pocket, and a stopper disposed in the bearing pocket to support the bearing,
The stopper includes a plate portion and a side wall portion,
A motor in which a protrusion formed on the body is coupled to the cutout formed in the plate portion. According to claim 1,
The protrusion is formed to protrude in an axial direction inside the bearing pocket. According to claim 2,
The protrusion and the plate portion of the motor in contact with the outer ring of the bearing. According to claim 3,
A motor in which the friction coefficient of the protrusion and the friction coefficient of the plate part are different. According to claim 1,
Further comprising a second protrusion formed to protrude inward from an end of the first protrusion,
The second protrusion is disposed to overlap the sidewall portion in the axial direction. According to claim 5,
The motor further extends in the radial direction so as to support the outer ring of the bearing. According to claim 5 or 6,
Further comprising a substrate coupled to the cover,
An upper surface of the substrate is in contact with the second protruding portion. According to claim 7,
A hole is formed in the center of the substrate,
An inner radius of the side wall portion is greater than a radius of the hole. According to claim 7,
Further comprising a sensing magnet assembly coupled to the shaft,
A motor disposed on the substrate to face the sensing magnet of the sensing magnet assembly. According to claim 1,
The integrally formed body, the first protrusion, and the protrusion are formed of a synthetic resin material,
The motor stopper is formed of a metal material. According to claim 1,
The motor where the stopper is disposed in the bearing pocket through an insert injection method. an apertured housing;
a cover disposed to cover the opening;
a stator disposed inside the housing;
a rotor disposed inside the stator;
a shaft coupled to the rotor; and
Including a bearing disposed on the outer circumferential surface of the shaft,
The cover includes a body having a hole in the center, a first protrusion extending axially from the body to form a bearing pocket, a second protrusion extending radially from an end of the first protrusion, and a stopper disposed in the bearing pocket to support the bearing,
The stopper includes a plate portion and a side wall portion,
The second protrusion is disposed to overlap the sidewall portion in the axial direction. According to claim 12,
Further comprising a substrate coupled to the cover,
An upper surface of the substrate is in contact with the second protruding portion. According to claim 12,
Further comprising a substrate coupled to the cover,
A hole is formed in the center of the substrate,
An inner radius of the side wall portion is greater than a radius of the hole. According to claim 13 or 14,
A bearing disposed in the housing is supported by a stepped portion of the shaft.

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