KR102617047B1 - Motor - Google Patents

Abstract

Examples include shafts; a rotor disposed outside the shaft; A stator disposed outside the rotor; and a housing for accommodating the rotor and the stator, wherein the stator includes a stator core, an insulator disposed on the stator core, and a coil wound around the insulator, and the insulator includes a body around which the coil is wound, and the body. It includes an inner guide protruding axially from the inside, an outer guide protruding axially from the outside of the body, and a slot formed in the outer guide, and a boss protruding radially from the inner peripheral surface of the housing is disposed in the slot. It's about the motor that works. Accordingly, the motor can prevent the stator from slipping by combining the slot of the stator and the boss of the housing.

Description

motor{MOTOR}

The embodiment relates to a motor.

A motor is a device that obtains rotational power by converting electrical energy into mechanical energy, and is widely used in vehicles, household electronic products, and industrial devices.

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.

The motor may include a housing, a shaft, a stator disposed on the inner peripheral surface of the housing, and a rotor installed on the outer peripheral surface of the shaft. Here, the stator causes electrical interaction with the rotor to induce rotation of the rotor.

Looking at the process of placing the stator in the housing of the motor, the stator can be coupled to the housing using a hot pressing method in which the stator is pressed in after heating the housing.

In the case of a housing combined with a stator using this hot pressing method, the housing may expand again in a high temperature environment. At this time, there is a difference in thermal expansion coefficient between the housing and the stator, so the housing may expand more than the stator. Accordingly, there is a problem that a slip phenomenon occurs in which the stator rotates or rotates within the housing.

In particular, the high temperature environment may frequently occur inside a vehicle.

Accordingly, there is a need for a structure that can prevent rotation of the stator even if the housing expands due to the high temperature environment.

The embodiment provides a motor that can prevent slip or rotation of the stator while determining the assembly position between the housing and the stator using a boss disposed in the housing.

The problem to be solved by the present invention is 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 disposed outside the shaft; A stator disposed outside the rotor; and a housing for accommodating the rotor and the stator, wherein the stator includes a stator core, an insulator disposed on the stator core, and a coil wound around the insulator, and the insulator includes a body around which the coil is wound, and the body. It includes an inner guide protruding axially from the inside, an outer guide protruding axially from the outside of the body, and a slot formed in the outer guide, and a boss protruding radially from the inner peripheral surface of the housing is disposed in the slot. This is achieved by means of a motor.

Here, the insulator includes two protrusions that protrude in the radial direction from the outer surface of the outer guide, and as the protrusions are arranged to be spaced apart from each other in the circumferential direction, the slot may be formed between the protrusions.

Additionally, the boss may protrude in the axial direction from the bottom of the housing.

Also, the upper surface of the boss may be in contact with the lower surface of the stator core.

Additionally, the axial length of the boss may be longer than the axial length of the protrusion.

Meanwhile, the boss may be formed in a tapered shape including an inclined surface.

And, the width between the protrusions may become narrower toward the top.

Additionally, the boss may be formed by an emboss process.

Additionally, the outer guide may be arranged to overlap the yoke of the stator core in the axial direction. For example, the outer guide may be disposed on the lower side of the yoke of the stator core in the axial direction.

Here, the end of the protrusion may be disposed inside the outer peripheral surface of the stator core.

Meanwhile, the insulator is made of a synthetic resin material, the housing is made of a metal material, and the thermal expansion coefficient of the housing may be greater than that of the insulator.

The motor according to the embodiment may prevent the stator from slipping by combining the slot of the stator and the boss of the housing. Here, the slot may be provided as a space between two protrusions protruding in the radial direction from the outer guide of the insulator.

Additionally, the motor may use the boss of the housing to assemble the stator at a preset position in the circumferential direction.

Additionally, as the boss of the housing coupled to the slot of the stator contacts one surface of the stator core, the stator may be placed at a preset position in the axial direction. At this time, since at least three bosses are arranged at equal intervals on the inner surface of the housing, it is possible to prevent the stator from being disposed in the housing tilted in the axial direction.

In addition, since the thermal expansion coefficient of the housing is greater than that of the insulator, the boss of the housing is caught between the protrusions in a high temperature environment, thereby preventing the stator from slipping against the housing.

The various and beneficial advantages and effects of the embodiments are not limited to the above-described content, and may be more easily understood through description of specific embodiments of the embodiments.

1 is a diagram showing a motor according to an embodiment,
2 is a perspective view showing a housing according to a first embodiment of a motor according to an embodiment;
3 is a perspective view showing a stator according to a first embodiment of a motor according to an embodiment;
4 is a bottom view showing a stator according to a first embodiment of a motor according to an embodiment;
5 is a diagram showing a stator core of a motor according to an embodiment;
6 is a perspective view showing an insulator according to a first embodiment of a motor according to an embodiment;
7 is a diagram showing the combination of a housing according to a first embodiment of a motor according to an embodiment and an insulator according to the first embodiment,
8 is a perspective view showing a housing according to a second embodiment of the motor according to the embodiment;
9 is a bottom view showing a stator according to a second embodiment of the motor according to the embodiment;
Figure 10 is a perspective view showing an insulator according to a second embodiment of the motor according to the embodiment;
11 is a front view showing an insulator according to a second embodiment of the motor according to the embodiment;
Figure 12 is a diagram showing the combination of the housing according to the second embodiment of the motor according to the embodiment and the insulator according to the second embodiment.

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

However, the technical idea of the present invention is not limited to some of the described embodiments, but may be implemented in various different forms, and as long as it is within the scope of the technical idea of the present invention, one or more of the components may be optionally used between the embodiments. It can be used by combining and replacing.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, are generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted by considering the contextual meaning of the related technology.

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

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

Additionally, when describing the components of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used.

These terms are only used to distinguish the component from other components, and are not limited to the essence, sequence, or order of the component.

And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to that other component, but also is connected to that component. It can also include cases where other components are 'connected', 'coupled', or 'connected' by another component between them.

Additionally, when described as being formed or disposed "above" or "below" each component, "above" or "below" refers not only to cases where two components are in direct contact with each other, but also to one This also includes cases where another component described above is formed or placed between two components. In addition, when expressed as "top (above) or bottom (bottom)", it may include not only the upward direction but also the downward direction based on one component.

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.

1 is a diagram showing a motor according to an embodiment. In Figure 1, the x-direction refers to the axial direction, and the y-direction refers to the radial direction. And, the axial direction and the radial direction are perpendicular to each other.

Referring to FIG. 1, the motor 1 according to the embodiment includes a housing 100, 100a with an opening formed on one side, a cover 200 disposed on the upper part of the housing 100, 100a, and the housing 100, 100a. A stator 300, 300a disposed inside, a rotor 400 disposed inside the stator 300, 300a, and a shaft 500 rotating with the rotor 400, disposed on the upper side of the stator 300, 300a. It may include a sensor unit 700 that detects the rotation of the bus bar 600 and the shaft 500.

At this time, the motor 1 is capable of slipping even in a high temperature environment through coupling with the bosses 120, 120a formed on the housings 100, 100a and the slots formed on the insulators 320, 320a of the stators 300, 300a. You can prevent it from happening. Here, the inside refers to the direction disposed toward the center (C) based on the radial direction, and the outside refers to the direction opposite to the inside.

As such, the motor 1 may be a motor used in EPS. EPS (Electronic Power Steering System) assists the steering force with the driving force of the motor, ensuring turning stability and providing rapid restoring force to enable the driver to drive safely.

The housings 100 and 100a and the cover 200 may form the outer shape of the motor 1. Additionally, a receiving space may be formed by combining the housings 100 and 100a and the cover 200. Accordingly, as shown in FIG. 1, a stator 300, 300a, a rotor 400, a shaft 500, etc. may be arranged in the accommodation space. At this time, the shaft 500 is rotatably disposed in the receiving space. Accordingly, the motor 1 may further include bearings 10 disposed at the upper and lower portions of the shaft 500, respectively.

The housings 100 and 100a can accommodate a stator 300, a rotor 400, etc. therein. At this time, the shape or material of the housings 100 and 100a may be changed in various ways. For example, the housings 100 and 100a may be made of a metal material that can withstand high temperatures.

Figure 2 is a perspective view showing a housing according to a first embodiment of a motor according to an embodiment. Here, FIG. 2 is a diagram showing the housing 100 according to the first embodiment, and compared to the housing 100a according to the second embodiment, there is a difference in the shape of the boss.

Referring to FIG. 2, the housing 100 according to the first embodiment may include a housing body 110 and a boss 120 disposed inside the housing body 110. At this time, the boss 120 may be formed in a bar shape. Here, the housing body 110 and the boss 120 may be formed integrally.

The housing body 110 may be formed in a cylindrical shape. Additionally, a stator 300, a rotor 400, etc. may be disposed within the housing body 110.

The boss 120 may be formed to protrude in the radial direction from the inner peripheral surface 111 of the housing body 110. As shown in FIG. 2, the boss 120 may be formed to protrude in the axial direction along the inner peripheral surface 111 from the bottom surface 112 of the housing body 110. Accordingly, as shown in FIG. 1, the boss 120 may be formed to have a predetermined first height H1 based on the bottom surface 112. And, the boss 120 may include an upper surface 121.

Additionally, the first height H1 may be the height from the bottom 112 of the housing 100 to the stator core 310. For example, the upper surface 121 of the boss 120 may contact the lower surface 311a of the stator core 310. Accordingly, the stator 300 may be disposed while maintaining the preset first height H1 in the axial direction.

Additionally, at least three bosses 120 may be disposed on the housing body 110 at equal intervals along the circumferential direction. That is, since the boss 120 of the housing 100 is coupled to the protrusion 324 of the insulator 320 at three points and comes into contact with the lower surface 311a, the stator 300 is prevented from shaking in the axial direction or is minimized.

Meanwhile, the boss 120 may protrude through an emboss process. That is, the boss 120 can be protruded into the inside of the housing body 110 by applying force to the outside of the housing body 110.

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

The stator 300 may be placed inside the housing 100. At this time, the stator 300 may be coupled to the housing 100 through a hot pressing method. Accordingly, the stator 300 may be supported on the inner peripheral surface of the housing 100. And, the stator 300 is disposed outside the rotor 400. That is, the rotor 400 may be rotatably disposed inside the stator 300.

FIG. 3 is a perspective view showing a stator according to a first embodiment of a motor according to an embodiment, and FIG. 4 is a bottom view showing a stator according to a first embodiment of a motor according to an embodiment.

3 and 4, the stator 300 may include a stator core 310, an insulator 320 disposed on the stator core 310, and a coil 330 wound on the insulator 320. there is. Here, the insulator 320 is disposed between the stator core 310 and the coil 330 to insulate the coil 330.

A coil 330 forming a rotating magnetic field may be wound around the stator core 310.

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. Additionally, the stator core 310 may be formed by arranging a plurality of unit stator cores along the circumferential direction.

5 is a diagram showing a stator core of a motor according to an embodiment.

Referring to FIG. 5 , the stator core 310 may include a cylindrical yoke 311 and a plurality of teeth 312 . Additionally, the teeth 312 may be formed to protrude in the radial direction from the inner peripheral surface of the yoke 311 for winding the coil 330. Here, as an example, the yoke 311 and the tooth 312 are formed integrally, but this is not necessarily limited.

Meanwhile, the teeth 312 may be arranged to face the magnet of the rotor 400. And, a coil 330 is wound around each tooth 312.

The insulator 320 insulates the stator core 310 and the coil 330. Here, the insulator 320 may be formed of a synthetic resin material. Accordingly, the insulator 320 may be disposed between the stator core 310 and the coil 330.

At this time, the coil 330 may be wound around the stator core 310 on which the insulator 320 is disposed. And, the coil 330 can form a rotating magnetic field by supplying power.

The insulator 320 may be coupled to the upper and lower sides of the stator core 310. At this time, for coupling with the stator core 310, the insulator 320 may be formed as a single piece. Alternatively, the insulator 320 may be formed of a plurality of unit insulators arranged along the circumferential direction of the stator core 310.

6 is a perspective view showing an insulator according to a first embodiment of a motor according to an embodiment.

Referring to FIG. 6, the insulator 320 includes a body 321 on which the coil 330 is wound, an inner guide 322 extending to protrude in the axial direction from the inside of the body 321, and an outside of the body 321. It may include an outer guide 323 extending protruding in the axial direction and a slot S formed in the outer guide 323. At this time, the insulator 320 may include two protrusions 324 protruding in the radial direction from the outer surface 323a of the outer guide 323. And, as the protrusions 324 are arranged to be spaced apart from each other in the circumferential direction, the slot S may be formed between the protrusions 324. Here, the body 321, the inner guide 322, the outer guide 323, and the protrusion 324 may be formed as one body.

Accordingly, the boss 120 of the housing 100 is coupled to the slot S to prevent the stator 300 from slipping in the circumferential direction.

A coil 330 may be wound around the body 321.

The body 321 may be disposed on the teeth 312 of the stator core 310 to insulate the stator core 310 and the coil 330.

The body 321 may be formed in a 'ㄷ' shape, and a groove 321a may be formed on the outer surface of the body 321. Here, the groove 321a may have a concave groove shape. Also, when winding the coil 330, the groove 321a can guide the arrangement of the coil 330.

The inner guide 322 may be disposed inside the body 321. As shown in FIG. 6, the inner guide 322 may be formed to protrude from the inside of the body 321 in the axial and circumferential directions. Here, the axial direction may be the longitudinal direction of the shaft 500.

Accordingly, the inner guide 322 supports the coil 330 wound on the body 321 and prevents the coil 330 from being separated inward.

The outer guide 323 may be disposed outside the body 321. As shown in FIG. 6, the outer guide 323 may be formed to protrude from the outside of the body 321 in the axial and circumferential directions.

At this time, the outer guide 323 may be disposed on the lower side of the lower surface 311a of the yoke 311. Accordingly, the outer guide 323 may be arranged to overlap the yoke 311 in the axial direction.

The outer guide 323 supports the coil 330 wound on the body 321 and prevents the coil 330 from being separated to the outside.

Referring to FIG. 6, two protrusions 324 may protrude in the radial direction from the outer surface 323a of the outer guide 323. Additionally, the protrusions 324 may be arranged to be spaced apart from each other in the circumferential direction. Accordingly, the slot S may be provided as a space formed between the protrusions 324. And, the slot S guides the placement of the boss 120.

Here, the slot S is formed by a protrusion as an example, but is not necessarily limited thereto. For example, by forming a groove along the axial direction on the outer surface 323a of the outer guide 323, the groove may serve as a slot S.

Meanwhile, the protrusion 324 may protrude to a predetermined first length (L) based on the radial direction. At this time, the end of the protrusion 324 is disposed inside the outer peripheral surface 311b of the stator core 310 based on the radial direction. In detail, based on the radial direction, the end of the protrusion 324 is disposed inside the outer peripheral surface 311b of the yoke 311 of the stator core 310.

Accordingly, the protrusion 324 may be disposed on the lower side of the lower surface 311a of the yoke 311. Accordingly, as shown in FIG. 4, the protrusion 324 may be arranged to overlap the yoke 311 in the axial direction.

Additionally, the protrusion 324 may be formed to have a width W in the circumferential direction. The width W of the protrusion 324 may be formed in consideration of the flexibility corresponding to thermal expansion of the boss 120. Here, the width W of the protrusion 324 may be called the first width.

Additionally, the protrusion 324 may be formed to have a predetermined second height H2 from the top to the bottom of the outer guide 323. Accordingly, the axial height of the protrusion 324 may be the same as the axial height of the outer guide 323.

7 is a diagram showing the combination of a housing according to a first embodiment of a motor according to an embodiment and an insulator according to the first embodiment.

Referring to FIG. 7, a boss 120 may be placed in the slot S formed between the protrusions 324. Accordingly, the protrusion 324 guides the engagement of the boss 120 and positions the stator 300 at a preset position of the housing 100 based on the circumferential direction.

When the boss 120 of the housing 100 is disposed in the slot S of the stator 300, the boss 120 may contact the lower surface 311a of the yoke 311. At this time, the first height H1 of the boss 120 is greater than the second height H2 of the protrusion 324 based on the lower surface 311a of the yoke 311. That is, the axial length of the boss 120 is longer than the axial length of the protrusion 324.

Accordingly, the stator 300 may be located at a preset position of the housing 100 based on the axial direction. That is, as the boss 120 contacts the lower surface 311a of the yoke 311, the stator 300 is positioned at a preset height from the lower surface 112 of the housing 100.

Meanwhile, when the boss 120 of the housing 100 is placed between the protrusions 324 of the stator 300, even if the housing 100 thermally expands due to a high temperature environment, the boss 120 of the housing 100 undergoes thermal expansion. Since the coefficient is greater than the thermal expansion coefficient of the insulator 320, the boss 120 is caught against the protrusion 324. Accordingly, slip in the circumferential direction of the stator 300 is prevented.

Figure 8 is a perspective view showing a housing according to a second embodiment of the motor according to the embodiment. In describing the housing 100a according to the second embodiment with reference to FIG. 8, the same components as those of the housing 100 according to the first embodiment may be indicated by the same reference numerals, and a detailed description thereof will be provided. Decided to omit it.

Compared to the housing 100 according to the first embodiment, the housing 100a according to the second embodiment has a difference in the shape of the boss 120a. And, compared to the stator 300 according to the first embodiment, the stator 300a according to the second embodiment is different in the shape of the protrusion 324a of the insulator 320a.

Referring to FIG. 8, the housing 100a according to the second embodiment may include a housing body 110 and a boss 120a disposed inside the housing body 110.

The boss 120a may be formed to protrude in the radial direction from the inner peripheral surface 111 of the housing body 110. Additionally, the boss 120a may be formed to protrude in the axial direction from the bottom surface 112 of the housing body 110. Accordingly, as shown in FIG. 1, the boss 120a may be formed to have a predetermined first height H1 based on the bottom surface 112.

In addition, at least three bosses 120a are disposed on the inner peripheral surface 111 of the housing body 110 at equal intervals along the circumferential direction, and at this time, the upper surface 121 of the boss 120a is in contact with the lower surface 311a. Therefore, the stator 300a is prevented or minimized from shaking in the axial direction.

Accordingly, the first height H1 may be the height from the bottom surface 112 of the housing 100a to the stator core 310. Accordingly, the stator 300a may be disposed while maintaining the preset first height H1 in the axial direction.

As shown in FIG. 8, the boss 120a may be formed in the axial direction along the inner peripheral surface 111 from the bottom surface 112 of the housing body 110. Accordingly, the boss 120a may include an upper surface 121.

When viewed in the radial direction, the boss 120a may be formed in a tapered shape. For example, the boss 120a may be formed to have a trapezoid-shaped vertical cross-section whose width increases toward the bottom. Accordingly, the boss 120a may include an inclined surface 122 inclined at a first angle θ1 in the axial direction.

Meanwhile, the boss 120a may protrude through an emboss process. That is, the boss 120a can be protruded into the inside of the housing body 110 by applying force to the outside of the housing body 110.

FIG. 9 is a bottom view showing a stator according to a second embodiment of a motor according to an embodiment, FIG. 10 is a perspective view showing an insulator according to a second embodiment of a motor according to an embodiment, and FIG. 11 is a This is a front view showing an insulator according to a second embodiment of the motor.

Referring to FIG. 9, the stator 300a may include a stator core 310, an insulator 320a disposed on the stator core 310, and a coil 330 wound around the insulator 320a.

Referring to FIGS. 10 and 11 , the insulator 320a includes a body 321 on which a coil 330 is wound, an inner guide 322 extending protruding in the axial direction from the inside of the body 321, and a body 321. It may include an outer guide 323 extending protruding from the outside in the axial direction and a slot S formed in the outer guide 323. At this time, the insulator 320a may include two protrusions 324a protruding in the radial direction from the outer surface 323a of the outer guide 323. And, as the protrusions 324a are arranged to be spaced apart from each other in the circumferential direction, the slot S may be formed between the protrusions 324. Here, the body 321, the inner guide 322, the outer guide 323, and the protrusion 324a may be formed as one body.

Accordingly, the boss 120a of the housing 100a is coupled to the slot S to prevent the stator 300a from slipping in the circumferential direction.

Referring to FIGS. 10 and 11 , two protrusions 324a may protrude in the radial direction from the outer surface 323a of the outer guide 323. Additionally, the protrusions 324a may be arranged to be spaced apart from each other in the circumferential direction. Accordingly, the slot S may be provided as a space formed between the protrusions 324a.

The protrusion 324a may protrude to a predetermined first length L based on the radial direction. At this time, based on the radial direction, the end of the protrusion 324a is disposed inside the outer peripheral surface 311b of the stator core 310. In detail, based on the radial direction, the end of the protrusion 324a is disposed inside the outer peripheral surface 311b of the yoke 311 of the stator core 310.

Accordingly, the protrusion 324a may be disposed on the lower side of the lower surface 311a of the yoke 311. Accordingly, as shown in FIG. 9, the protrusion 324a may be arranged to overlap the yoke 311 in the axial direction.

Additionally, the protrusion 324a may be formed to have a width W in the circumferential direction, but is not necessarily limited thereto.

Additionally, the protrusion 324a may be formed to have a predetermined second height H2 from the top to the bottom of the outer guide 323. Accordingly, the axial height of the protrusion 324a may be the same as the axial height of the outer guide 323.

Referring to FIG. 11 , when viewed in the radial direction, the protrusion 324a may include an inner surface 325 inclined at a second angle θ2 with respect to the axial direction. Here, the inner surface 325 may be a surface where two protrusions 324a face each other in the circumferential direction. At this time, the first angle θ1 of the boss 120a and the second angle θ2 of the inner surface 325 may be the same.

Accordingly, the width W1 between the protrusions 324a may become narrower toward the top. Here, the width W1 between the protrusions 324a may be called the second width.

Figure 12 is a diagram showing the combination of a housing according to a second embodiment of a motor according to an embodiment and an insulator according to a second embodiment.

Referring to FIG. 12, a boss 120a may be placed in the slot S formed between the protrusions 324a. At this time, the inclined surface 122 of the boss 120a may be guided by the inner surface 325 of the protrusion 324a. Additionally, the inclined surface 122 of the boss 120a contacts the inner surface 325 of the protrusion 324a to couple the boss 120a and the protrusion 324a in a fitting manner. Accordingly, the protrusion 324a guides the engagement of the boss 120a and positions the stator 300a at a preset position of the housing 100a based on the circumferential direction.

Meanwhile, the upper surface 121 of the boss 120 of the housing 100 according to the above-described first embodiment is in contact with the lower surface 311a of the yoke 311, as if the upper surface 121 of the housing 100a according to the second embodiment is in contact with the lower surface 311a of the yoke 311. The upper surface 121 of the boss 120a may be in contact with the lower surface 311a of the yoke 311, but is not necessarily limited to this.

For example, by adjusting the width between the inner surface 325 of the protrusion 324a, the upper surface 121 of the boss 120a of the housing 100a may be arranged to be spaced apart from the lower surface 311a of the yoke 311. there is. That is, by adjusting the width between the inner surface 325 of the protrusion 324a in response to the upper width of the boss 120a, the axial position of the stator 300 with respect to the bottom surface 112 of the housing 100 can be adjusted.

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 330 wound around the stator 300. These magnets may be arranged so that the N and S poles are alternately positioned along the circumferential direction around the shaft 500.

Accordingly, the rotor 400 rotates due to the electrical interaction between the coil 330 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 cylinder. Here, the rotor core may be implemented in a shape in which a plurality of plates in the form of circular thin steel plates are stacked.

As shown in FIG. 1, the shaft 500 may be rotatably supported inside the housing 100 by a bearing 10. Additionally, the shaft 500 may rotate in conjunction with the rotation of the rotor 400.

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 330 of the stator 300.

The bus bar 600 may include a bus bar body and a plurality of terminals disposed inside the bus bar body. Here, the bus bar body may be a mold formed through injection molding. Additionally, each of the terminals may be electrically connected to the coil 330 of the stator 300.

The sensor unit 700 detects the magnetic force of a sensing magnet installed to be rotationally interlocked with the rotor 400 and determines the current position of the rotor 400, thereby detecting the rotation of the shaft 500.

The sensor unit 700 may include a sensing magnet assembly 710 and a printed circuit board (PCB) 720.

The sensing magnet assembly 710 is coupled to the shaft 500 to interoperate with the rotor 400 to detect the position of the rotor 400. At this time, the sensing magnet assembly 710 may include a sensing magnet and a sensing plate. The sensing magnet and the sensing plate may be coupled to have the same axis.

The sensing magnet may include a main magnet disposed in the circumferential direction adjacent to the hole forming the inner peripheral surface and a sub-magnet formed at the edge. The main magnet may be arranged in the same manner as the drive magnet inserted into the rotor 400 of the motor. The sub-magnet is more subdivided than the main magnet and consists of many poles. Accordingly, it is possible to measure the rotation angle by dividing it more finely and drive the motor more smoothly.

The sensing plate may be formed of a disk-shaped metal material. A sensing magnet may be coupled to the upper surface of the sensing plate. And the sensing plate may be coupled to the shaft 500. Here, a hole through which the shaft 500 passes is formed in the sensing plate.

A sensor that detects the magnetic force of the sensing magnet may be placed on the printed circuit board 720. At this time, the sensor may be provided as a Hall IC. Additionally, the sensor can generate a sensing signal by detecting changes in the N and S poles of the sensing magnet.

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: motor
100, 100a: housing 120, 120a: boss
200: Cover
300, 300a: stator
310: stator core
320: insulator
331: body
332: inner guide 333: outer guide
334, 324a: protrusion
330: coil
400: rotor
500: shaft
600: Bus bar
700: Sensor unit

Claims (12)

shaft;
a rotor disposed outside the shaft;
A stator disposed outside the rotor; and
Comprising a housing accommodating the rotor and the stator,
The stator is,
stator core,
an insulator disposed on the stator core, and
It includes a coil wound on the insulator,
The insulator is
A body on which the coil is wound,
An inner guide protruding axially from the inside of the body,
An outer guide protruding axially from the outside of the body and
Includes a slot formed in the outer guide,
The housing includes a cylindrical housing body and a boss protruding inward from the inner peripheral surface of the housing body,
The boss is formed in a tapered shape including an inclined surface,
A motor in which the upper surface of the boss is spaced apart from the lower surface of the yoke of the stator core when the boss is coupled to the slot in a fitting manner. According to paragraph 1,
The insulator includes two protrusions protruding in a radial direction from the outer surface of the outer guide,
A motor in which the slots are formed between the protrusions as the protrusions are spaced apart from each other in the circumferential direction. According to paragraph 2,
The boss is a motor that protrudes in the axial direction from the bottom of the housing. delete According to paragraph 2,
A motor in which the axial length of the boss is longer than the axial length of the protrusion. According to clause 5,
A motor in which the bottom of the protrusion is spaced apart from the bottom of the housing based on the axial direction. According to paragraph 2,
A motor in which the width between the protrusions becomes narrower toward the top. According to paragraph 3,
A motor in which at least three bosses are arranged at equal intervals on the inner peripheral surface of the housing. According to paragraph 3,
A motor in which the boss is formed by an emboss process. According to paragraph 2,
A motor in which the outer guide overlaps the yoke of the stator core in the axial direction. According to clause 10,
A motor in which an end of the protrusion is disposed inside an outer peripheral surface of the stator core. According to paragraph 1,
The insulator is made of a synthetic resin material, and the housing is made of a metal material,
A motor wherein the thermal expansion coefficient of the housing is greater than that of the insulator.

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