KR102489301B1 - ROTOR AND Motor HAVING THE SAME - Google Patents

Abstract

The present invention is a rotor core; a coil wound around the rotor core; and covers respectively disposed on upper portions of the rotor core, wherein the covers include a main body disposed on the rotor core; a plurality of blades disposed on an upper surface of the main body; and a rotor including at least two first protrusions protruding in an axial direction from an upper surface of the main body, and a motor including the same. Accordingly, the motor may perform a balancing operation of the rotor using the first protrusion.

Description

A rotor and a motor including the same {ROTOR AND Motor HAVING THE SAME}

The embodiment relates to a rotor and a motor including the same.

The motor may include a shaft formed to be rotatable, a rotor coupled to the shaft, and a stator fixed inside the housing. At this time, a stator is installed with a gap along the circumference of the rotor.

The motor induces rotation of the rotor through electrical interaction. When a coil is wound around the rotor, a commutator and a brush may be further disposed to supply current to the coil wound around the rotating rotor. Here, the brush is made of a carbon material or the like and may be used as a consumable part.

Typically, the commutator rotates by being coupled to a shaft while being connected to a coil, and the brush is coupled to a housing and disposed to be in contact with the commutator. At this time, the brush contacts the commutator to supply electricity.

Meanwhile, when the motor is not balanced with respect to the rotor, vibration and noise may occur according to driving of the motor. Accordingly, an operation of balancing the weight of the rotor based on the shaft is performed.

The balance correction operation of the rotor may be performed by determining a balance correction point through balance measurement and cutting a certain point of the cover corresponding to the balance correction point.

For the balance correction work according to this cutting, the cover requires a predetermined thickness. Accordingly, there is a problem of reducing space utilization with the problem of increasing the weight and size of the motor. Inventions related to this include Patent Publication No. 10-2016-0007031 (2016.01.20.), Patent Publication No. 10-2017-0077516 (2017.07.06.), and Japanese Unexamined Patent Publication No. 05-146117 (1993.06.11.).

A rotor capable of performing balance correction and a motor including the same are provided.

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 above task is a rotor core; a coil wound around the rotor core; and covers respectively disposed on upper portions of the rotor core, wherein the covers include a main body disposed on the rotor core; a plurality of blades disposed on an upper surface of the main body; and at least two first protrusions protruding in an axial direction from an upper surface of the main body.

The body may include a plate disposed on an upper portion of the rotor core; and a sleeve protruding in an axial direction from an outer circumferential surface of the plate, wherein the first protrusion may protrude in an axial direction from an upper surface of the plate.

And, it may further include a second protrusion protruding in the axial direction from the lower surface of the plate.

Here, the second protrusion may protrude inward from the inner circumferential surface of the sleeve.

The first protrusion is disposed to protrude inward from an outer edge of the plate and may be disposed between the blades.

A portion of the outer surface of the first protrusion may have the same curvature as the outer circumferential surface of the plate.

Also, a height of the first protrusion may be smaller than a height of the blade.

Meanwhile, a groove may be concavely formed on an upper surface of the first protrusion.

According to the embodiment, the task is a shaft; a rotor on which the shaft is disposed; a stator disposed outside the rotor; and a housing disposed on the stator, wherein the rotor includes a coil wound around the rotor core; and a cover disposed on an upper portion of the rotor core, wherein the cover includes a main body disposed on the rotor core; a plurality of blades disposed on an upper surface of the main body; and at least two first protrusions protruding in an axial direction from an upper surface of the main body.

And, it further includes a second protrusion protruding in the axial direction from the lower surface of the main body, the second protrusion with respect to the main body may extend the first protrusion downward.

In addition, a groove may be concavely formed on an upper surface of the first protrusion.

Meanwhile, the housing of the motor includes a first housing disposed above the stator; and a second housing disposed below the stator, and a first hole may be formed on an outer circumferential surface of each of the first housing and the second housing.

In addition, hot air generated in the rotor may move in a radial direction by rotation of the blade and be discharged through the first hole.

In this case, the main body further includes a plurality of second holes formed in a circumferential direction, and hot air generated from the coils of the rotor may be discharged through the second holes formed in the main body.

The rotor according to the embodiment having the above configuration and a protrusion for negative balancing (realization of balancing through weight reduction) including the rotor may be provided to perform a balancing operation of the rotor.

In this case, a possible balancing amount may be improved by arranging a second protrusion extending downward from the first protrusion with respect to the main body.

Accordingly, the first protrusion and the second protrusion disposed outside the center may reduce the thickness of the cover disposed on the rotor, thereby reducing the weight and size of the motor.

In this case, the thickness of the cover may be further reduced by arranging the first protrusion and the second protrusion at the outermost part of the body in the radial direction.

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

1 is a perspective view showing a motor according to an embodiment,
Figure 2 is a cross-sectional view showing AA of Figure 1,
3 is a perspective view showing a rotor according to an embodiment,
4 is an exploded perspective view showing a rotor according to an embodiment;
5 is a perspective view showing a cover disposed on a rotor according to an embodiment;
6 is a plan view showing a cover disposed on a rotor according to an embodiment;
7 is a bottom view showing a cover disposed on a rotor according to an embodiment;
8 is a cross-sectional view illustrating a cover disposed on a rotor according to an 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.

1 is a perspective view illustrating a motor according to an embodiment, and FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 .

1 and 2, the motor 1 according to the embodiment includes a housing 100, a rotor 200, a stator 300, a shaft 400 rotating together with the rotor 200, and a commutator 500. , may include a brush 600. As shown in FIG. 2 , bearings 10 may be disposed above and below the shaft 400 .

The motor 1 may be provided as a BSG (Belt Driven Starter Generator) capable of serving as a starter motor and an alternator in one structure.

The housing 100 may form the outer shape of the motor 1 .

The housing 100 may include a first housing 110 disposed on one side (upper side) of the stator 300 and a second housing 120 disposed on the other side (lower side) of the stator 300 . For example, the first housing 110 and the second housing 120 may be spaced apart from each other with the stator 300 interposed therebetween.

The first housing 110 may include a first housing body 111 , a brush holder 112 disposed on one side of an upper portion of the first housing body 111 , and a terminal 113 .

The first housing body 111 and the brush holder 112 may be integrally formed. Also, the first housing body 111 and the brush holder 112 may be formed of a synthetic resin material. Accordingly, the weight of the motor 1 can be reduced.

The terminal 113 may be electrically connected to an end of the coil 320 wound around the stator 300 . As shown in FIGS. 1 and 2 , the terminal 113 may be disposed so that one area is exposed from the first housing body 111 . At this time, the terminal 113 may be disposed on the first housing body 111 through an insert injection method.

The rotor 200 is disposed inside the stator 300. In addition, the shaft 400 may be disposed through the center of the rotor 200 .

3 is a perspective view showing a rotor according to an embodiment, and FIG. 4 is an exploded perspective view showing a rotor according to an embodiment.

3 and 4 , the rotor 200 may include a rotor core 210, a coil 220 wound around the rotor core 210, and a cover 230. Here, the cover 230 may be respectively disposed above and below the rotor core 210 . In this case, the covers 230 respectively disposed on the top and bottom of the rotor core 210 may be the same, but are not necessarily limited thereto. For example, since the shape or arrangement position of the blade 233 disposed on the cover 230 can be varied in consideration of the flow of gas, the shape of the cover 230 disposed on the upper side and the cover 230 disposed on the lower side may be different.

The rotor core 210 may be implemented in a shape in which a plurality of plates in the form of circular thin steel plates are stacked or in the form of a single cylinder. A hole to which the shaft 400 is coupled may be formed in the center of the rotor core 210 .

The coil 220 may be wound around the rotor core 210 . Here, the rotor 200 is an example in which the coil 220 is wound around the rotor core 210, but is not necessarily limited thereto. For example, a magnet may be attached to the inner or outer circumferential surface of the rotor core 210 .

When current is supplied to the coil 220, an electrical interaction with the stator 300 is induced and the rotor 200 rotates. Here, the coil 220 may be named a first coil 220 to be distinguished from a coil wound around the stator 300 .

The cover 230 may be respectively disposed above and below the rotor core 210 .

The cover 230 may be disposed to cover the first coil 220 . Accordingly, the cover 230 prevents the first coil 220 from being separated.

Also, the cover 230 is coupled to the rotor core 210 and rotates integrally.

5 is a perspective view showing a cover disposed on a rotor according to an embodiment, FIG. 6 is a plan view illustrating a cover disposed on a rotor according to an embodiment, and FIG. 7 is a bottom view showing a cover disposed on a rotor according to an embodiment. 8 is a cross-sectional view showing a cover disposed on the rotor according to the embodiment. Here, FIG. 8 is a cross-sectional view taken along line BB of FIG. 5 .

In describing the cover 230 with reference to FIGS. 5 to 8 , since the cover 230 disposed above and below the rotor core 210 has a difference in arrangement position, it is disposed above the rotor core 210. The cover 230 to be described as a target.

The cover 230 may include a body 231 , a second hole 232 , a plurality of blades 233 and a first protrusion 234 . Also, the cover 230 may further include a second protrusion 235 and a groove 236 . Here, the body 231, the second hole 232, the blade 233, the first protrusion 234, the second protrusion 235, and the groove 236 may be formed by a die casting method. Accordingly, the main body 231, the blade 233, the first protrusion 234 and the second protrusion 235 may be integrally formed.

The body 231 of the cover 230 is coupled to the rotor core 210 and rotates integrally.

The body 231 may be disposed above the rotor core 210 . Accordingly, the body 231 may be disposed to cover the first coil 220 .

Referring to FIG. 5 , a body 231 may include a plate 237 and a sleeve 238 .

The plate 237 is disposed on the upper side of the rotor core 210. Here, the upper plate 237 may be formed in a disk shape, and a hole may be formed in the center for disposition of the shaft 400 .

The sleeve 238 may protrude downward from the outer circumferential surface of the plate 237 . In this case, the sleeve 238 may be disposed outside the rotor core 210 in the radial direction. Here, the downward direction may mean a downward direction based on the axial direction, and the upward direction may mean a direction opposite to the downward direction. Also, the axial direction (direction C) may be a longitudinal direction of the shaft 400 . At this time, the radial direction may be a direction perpendicular to the axial direction (C direction).

As shown in FIG. 5 , the sleeve 238 may be formed in a cylindrical shape.

The second hole 232 may be formed in the plate 237 of the body 231 . The second hole 232 may be formed to pass through the plate 237 in the axial direction.

Referring to FIG. 5 , a plurality of second holes 232 may be formed along the circumferential direction with respect to the center C. In this case, the second hole 232 may be disposed inside the blade 233 based on the radial direction.

As the blade 233 rotates, a flow of gas is generated, and hot air generated in the first coil 220 is discharged through the second hole 232 . Accordingly, the first coil 220 is cooled.

The blade 233 may protrude from the main body 231 . For example, in the case of the cover 230 disposed above the rotor core 210, the blades 233 may be formed to protrude upward from the main body 231. And, in the case of the cover 230 disposed below the rotor core 210, the blades 233 may be formed to protrude downward from the main body 231.

As shown in FIG. 5 , the plurality of blades 233 may be spaced apart from each other in the circumferential direction and disposed on the upper surface 237a of the plate 237 of the main body 231 . In addition, the plurality of blades 233 may be disposed on the edge side with respect to the center C of the cover 230 .

When the rotor 200 rotates, the blades 233 serve as a cooling fan generating a flow of gas. As shown in FIG. 5 , the blade 233 may have a predetermined curvature to easily generate a flow of gas.

The first protrusion 234 may be formed on the body 231 . As shown in FIG. 5 , the plurality of first protrusions 234 may be formed on the body 231 while being spaced apart from each other in the circumferential direction. For example, the plurality of first protrusions 234 may be disposed on the edge side with respect to the center C of the cover 230 .

Here, the blades 233 are arranged at predetermined intervals as an example, but are not necessarily limited thereto. For example, the intervals may be irregularly arranged.

The first protrusion 234 may protrude from the upper surface 237a of the body 231 in the axial direction. Here, as the first protrusion 234 is formed to a predetermined height H1, the thickness of the plate 237 in the axial direction may be reduced. At this time, considering the flow of air, the height H1 of the first protrusion 234 may be smaller than the height H2 of the blade 233 .

At least two first protrusions 234 may be formed. However, it goes without saying that three or more first protrusions 234 may be disposed to widely correspond to the balance correction point.

When a balance correction point is determined at a certain position of the plate 237, balancing of the motor 1 may be performed by cutting a region of the first protrusion 234 corresponding to the correction point. That is, the first protrusion 234 serves as a cutting point.

The first protrusion 234 may protrude inward from an outer corner of the plate 237 . That is, since the first protrusion 234 is disposed at the outermost part with respect to the center C, the balancing amount can be minimized.

A portion of the outer surface 234a of the first protrusion 234 may extend from the outer circumferential surface 237c of the plate 237 . Referring to FIG. 6 , a portion of the outer surface 234a of the first protrusion 234 may have the same curvature (1/R) as the outer circumferential surface 237c of the plate 237 .

Also, the first protrusion 234 may be disposed between the blades 233 .

Based on the plate 237 of the body 231, the second protrusion 235 may extend the first protrusion 234 downward. For example, a plate 237 may be disposed between the first protrusion 234 and the second protrusion 235 . In this case, the outer surface 234a of the first protrusion 234 and the outer surface 235a of the second protrusion 235 may be disposed on the same vertical line.

Accordingly, the second protrusion 235 may improve a balancing amount in the first protrusion 234 .

Also, the second protrusion 235 may be formed symmetrically with the first protrusion 234 based on the plate 237 .

However, the protruding height of the second protruding portion 235 should be arranged in consideration of interference with the first coil 220 . Accordingly, the second protrusion 235 may be disposed between the first coils 220 .

Referring to FIGS. 7 and 8 , the second protrusion 235 may protrude from the lower surface 237b of the main body 231 in the axial direction. At this time, the protrusion length of the second protrusion 235 is smaller than the length of the sleeve 238 .

At least two second protrusions 235 may be formed. However, as shown in FIG. 7 , three or more second protrusions 235 may be disposed to widely correspond to balance correction points.

When a balance correction point is determined at a certain position of the plate, when cutting a region of the first protrusion 234 corresponding to the correction point, the inside of the second protrusion 235 may be cut. Accordingly, the amount of balancing of the motor 1 can be further improved.

The second protrusion 235 may protrude inward from the inner circumferential surface 238a of the sleeve 238 .

The groove 236 may be formed on the top surface 234b of the first protrusion 234 . At this time, balancing may be performed through weight reduction using a tool such as a drill, and the groove 236 may be formed at the center of the upper surface 234b. Accordingly, groove 236 may serve as a balancing point.

Meanwhile, the rotor 200 may further include an insulator 240 disposed between the rotor core 210 and the coil 220 . The insulator 240 insulates the rotor core 210 and the coil 220.

The stator 300 causes an electrical interaction with the rotor 200 to induce rotation of the rotor 200 . The stator 300 may be disposed inside the housing 100 .

The stator 300 may include a stator core 310 and a coil 320 wound around the stator core 310 . In addition, in the stator 300, an insulator (not shown) may be further disposed between the stator core 310 and the coil 320 for insulation. Here, the coil 320 may be named a second coil 320 to be distinguished from the coil 220 wound around the rotor 200 .

The stator core 310 may be manufactured by combining a plurality of split cores or may be manufactured in the form of a single core.

Also, an end of the second coil 320 wound around the stator core 310 may be electrically connected to the terminal 113 of the first housing 110 .

Referring to FIGS. 1 and 2 , the first housing 110 may be disposed above the stator 300 and the second housing 120 may be disposed below the stator 300 .

Accordingly, a portion of the stator core 310 may be exposed between the first housing 110 and the second housing 120 . Therefore, heat generated in the stator 300 can be easily discharged to the outside. However, it is not necessarily limited thereto, and the stator 300 may be disposed inside the housing 100.

The shaft 400 rotates together with the rotation of the rotor 200 . At this time, the shaft 400 may be rotatably supported inside the housing 100 by the bearing 10 .

Meanwhile, in order to supply current to the rotating rotor 200, the commutator 500 and the brush 600 are required. Here, the motor 1 supplies current to the rotor 200 through the commutator 500 and the brush 600 as an example, but is not necessarily limited thereto.

The commutator 500 is coupled to the shaft 400. As shown in FIG. 2 , the commutator 500 may be disposed on an outer circumferential surface of the shaft 400 . Also, the commutator 500 may be disposed above the rotor 200 . Also, the commutator 500 is electrically connected to the first coil 220 disposed on the rotor 200 .

Meanwhile, the brush 600 may apply an external drive signal to the rotor 200 by contacting the commutator 500 .

Here, the brush 600 may be inserted into the brush holder 112 through an opening formed on one side of the brush holder 112 . At this time, the brush 600 may be in close contact with the commutator 500 by an elastic member. Thus, the brush holder 112 insulates the brush 600 from the outside.

Meanwhile, each of the first housing 110 and the second housing 120 may include a plurality of first holes 114 and 121 formed along the circumferential direction, as shown in FIG. 1 . The first holes 114 and 121 function to dissipate heat generated inside the motor 1 to the outside.

When the rotor 200 rotates, a flow of gas is generated by the blades 233, and hot air generated in the first coil 220 is discharged through the second hole 232. And, the hot air moves in the radial direction and is rapidly discharged to the outside through the first holes 114 and 121 . This structure is advantageous for motors that generate a large amount of heat due to high-speed rotation.

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: motor 10: bearing
100: housing 110: first housing
120: second housing 114, 121: first hole
200: rotor 210: rotor core
220: first coil 230: cover
231: main body 232: second hole
233: blade 234: first protrusion
235: second protrusion 236: groove
300: stator 310: stator core
400: shaft
500: commutator
600: brush

Claims (15)

rotor core;
a coil wound around the rotor core; and
Including; covers respectively disposed on the upper portion of the rotor core,
the cover
a body disposed on the rotor core;
a plurality of blades disposed on an upper surface of the main body; and
At least two first protrusions protruding in an axial direction from an upper surface of the body,
the main body
a plate disposed on top of the rotor core; and
Includes a sleeve protruding in the axial direction from the outer circumferential surface of the plate,
The first protrusion protruding in the axial direction from the upper surface of the plate is disposed to protrude inward from an outer edge of the plate, and is disposed between the blades. delete According to claim 1,
A rotor further comprising a second protrusion protruding in an axial direction from the lower surface of the plate. According to claim 3,
The rotor in which the plate is disposed between the first protrusion and the second protrusion. According to claim 4,
The second protrusion protrudes inwardly from the inner circumferential surface of the sleeve. delete According to claim 1,
A portion of the outer surface of the first protrusion has the same curvature as the outer circumferential surface of the plate. According to claim 1,
A height of the first protrusion is smaller than a height of the blade. The method of any one of claims 1, 3 to 5, 7 and 8,
A rotor having a concave groove formed on an upper surface of the first protrusion. shaft;
a rotor on which the shaft is disposed;
a stator disposed outside the rotor; and
A housing disposed on the stator; includes,
the rotor
rotor core;
a coil wound around the rotor core; and
Including; covers respectively disposed on the upper portion of the rotor core,
the cover
a body disposed on the rotor core;
a plurality of blades disposed on an upper surface of the main body; and
At least two first protrusions protruding in an axial direction from an upper surface of the body,
the main body
a plate disposed on top of the rotor core; and
Includes a sleeve protruding in the axial direction from the outer circumferential surface of the plate,
The first protrusion protruding in the axial direction from the upper surface of the plate is disposed to protrude inward from an outer edge of the plate, and is disposed between the blades. According to claim 10,
Further comprising a second protrusion protruding in the axial direction from the lower surface of the main body,
The second protrusion extends the first protrusion downward with respect to the main body. According to claim 11,
A motor having a concave groove formed on an upper surface of the first protrusion. According to claim 10,
the housing
a first housing disposed above the stator; and
And a second housing disposed under the stator,
A motor having a first hole formed on an outer circumferential surface of each of the first housing and the second housing. According to claim 13,
The motor of claim 1 , wherein hot air generated in the rotor moves in a radial direction by rotation of the blade and is discharged through the first hole. According to claim 14,
The main body further includes a plurality of second holes formed along the circumferential direction,
A motor in which hot air generated in the coil of the rotor is discharged through a second hole formed in the main body.

Images