KR20230107927A - Rotor and motor having the same - Google Patents

Abstract

An embodiment comprises: a housing; 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 peripheral surface of the shaft. The rotor comprises: a rotor unit including a rotor core and a magnet; and a can disposed to come into contact with the rotor unit. The can comprises: a body unit disposed to surround the rotor unit; and a support unit extending from the body unit. The support unit initiates a motor elastically supporting the bearing. Accordingly, the motor elastically supports the bearing using an elastic structure formed integrally with the can of the rotor, thereby extending the life of the bearing, preventing clearance due to bearing assembly, and improving noise in the motor.

Description

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

The present invention relates to a rotor and a motor including the same.

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 includes a housing, a cover disposed in an opening of the housing, a shaft, a rotor installed on an outer circumferential surface of the shaft, a stator disposed corresponding to the rotor, and disposed above the stator. A bus bar and a bearing disposed on an outer circumferential surface of the shaft may be included.

Here, the bearing is installed in a housing or a cover to rotatably support the shaft. Further, in order to extend the life of the bearing, prevent clearance due to assembly of the bearing, and improve noise, the motor may use a washer supporting the bearing.

However, the use of the washer adds a separate assembly process, and there is a problem in that productivity decreases due to the added assembly process.

In addition, since a separate part called the washer is used, there is a problem of additionally managing an assembly tolerance of the washer.

Accordingly, there is a demand for development of a structurally improved rotor and a motor including the same to support the bearing while improving productivity of the motor.

Embodiments provide a rotor for elastically supporting a bearing and a motor including the same.

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 task is a housing; 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 rotor includes a rotor portion including a rotor core and a magnet, and a can disposed in contact with the rotor portion, wherein the can is disposed to surround the rotor portion. It includes a body portion and a support portion extending from the body portion, and the support portion is achieved by a motor that elastically supports the bearing.

Here, the support portion may elastically support the inner ring of the bearing.

The task is a housing; 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 and spaced apart from the rotor in an axial direction, wherein the rotor includes a rotor portion including a rotor core and a magnet, and a can disposed in contact with the rotor portion, The can may include a first plate part contacting the rotor part; a second plate part disposed to be spaced apart from the first plate part in an axial direction; and an extension portion connecting the first plate portion and the second plate portion, wherein the second plate portion is achieved by a motor contacting the bearing.

Here, the bearing includes an inner race, an outer race, and a ball disposed between the inner race and the outer race, and the second plate portion may contact the inner race.

A radial width W1 of the second plate portion may be greater than a radial width W2 of the inner ring.

In addition, the second plate portion may be disposed on the shaft to be movable along the shaft. Preferably, the second plate portion may be formed in a ring shape.

In addition, the extension part may include a curved surface.

In addition, the extension part may be formed in a linear bar shape.

In addition, a plurality of extensions may be formed, and the plurality of extensions may be arranged rotationally symmetrically with respect to the center C.

In addition, the first plate portion may be disposed to overlap the magnet in an axial direction.

The can may further include a sidewall portion extending in an axial direction from an outer circumferential surface of the first plate portion, and an axial length of the sidewall portion may be the same as an axial length of the rotor portion.

The problem is a rotor portion including a rotor core and a magnet; and a can disposed in contact with the rotor unit, wherein the can includes a first plate unit and a second plate unit, and the first plate unit and the second plate unit are disposed to be spaced apart from each other with a predetermined distance (D). an extension to connect; and a side wall portion extending from an outer circumferential surface of the first plate portion, wherein the first plate portion is achieved by a rotor contacting the rotor portion.

In the embodiment, by elastically supporting the bearing using an elastic structure integrally formed in the can of the rotor, it is possible to extend the life of the bearing, prevent clearance due to bearing assembly, and improve noise of the motor.

The embodiment can respond to the specifications of the motor according to the customer's request while improving the design freedom of the elastic structure through the elastic structure supporting the inner ring of the bearing.

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 view showing a motor according to an embodiment,
2 is an enlarged view of region A in FIG. 1;
3 is a perspective view showing a rotor according to an embodiment,
4 is a bottom perspective view showing a rotor according to an embodiment;
5 is an exploded perspective view showing a rotor according to an embodiment;
6 is a bottom perspective view of a can disposed in a rotor according to an embodiment;
7 is a bottom view of a can disposed in a rotor according to an embodiment;
8 is a side view of a can disposed in a rotor according to an embodiment;
9 is a bottom view showing a modified example of a can disposed in a rotor according to an embodiment;
10 is a side view illustrating a modified example of a can disposed in a rotor 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 on the "top (above) or bottom (bottom)" of each component, the top (top) or bottom (bottom) is not only a case where two components are in direct contact with each other, but also one A case in which another component above is formed or disposed between two components is also included. 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 view showing a motor according to an embodiment, and FIG. 2 is an enlarged view of region A of FIG. 1 .

Here, the X direction shown in FIG. 1 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, the motor according to the embodiment includes a housing 100 having an opening formed on one side, a cover 200 disposed in the opening, a stator 300 disposed inside the housing 100, and a stator 300 ) The rotor 400 disposed inside, the shaft 500 coupled to the rotor 400, the bus bar 600 disposed above the stator 300, and disposed on the outer circumferential surface of the shaft 500 Bearings may be included. 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 700 disposed on the housing 100 and a second bearing 800 disposed on the cover 200 . In addition, each of the first bearing 700 and the second bearing 800 may include an inner race, an outer race, and a ball disposed between the inner race and the outer race. In this case, the first bearing 700 may be called a housing bearing, and the second bearing 800 may be called a cover bearing.

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 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 protrusion 110 disposed inside to support the first bearing 700 .

The protrusion 110 may be formed to protrude from an inner bottom surface of the housing 100 in an axial direction.

The protrusion 110 may be formed to have a ring-shaped cross section, and thus the housing 100 may form a pocket portion in which the first bearing 700 may be disposed through the protrusion 110. .

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. Here, the shape or material of the cover 200 may be variously modified. For example, the cover 200 may be formed of a metal material that can withstand high temperatures.

In addition, a second bearing 800 is disposed on the cover 200 to rotatably support the shaft 500 .

Referring to FIG. 1 , 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 .

3 is a perspective view showing a rotor according to an embodiment, FIG. 4 is a bottom perspective view showing a rotor according to an embodiment, FIG. 5 is an exploded perspective view showing a rotor according to an embodiment, and FIG. 6 is a rotor according to an embodiment. A bottom perspective view of a can disposed, Figure 7 is a bottom view of a can disposed in a rotor according to an embodiment, Figure 8 is a side view of a can disposed in a rotor according to an embodiment, Figure 9 is a rotor according to an embodiment It is a bottom view showing a modified example of a can disposed, and FIG. 10 is a side view illustrating a modified example of a can disposed in a rotor according to an embodiment.

The embodiment discloses two embodiments of the can, the cans shown in FIGS. 1 to 8 may represent the first embodiment, and the cans shown in FIGS. 9 and 10 may represent the second embodiment. can indicate

Accordingly, the motor according to the embodiment may include either the can 420 according to the first embodiment or the can 420a according to the second embodiment. Here, the can 420 according to the first embodiment may be called a first can, and the can 420a according to the second embodiment may be called a second can, and when assembling the motor, the second can may be used instead of the first can.

When comparing the can 420 according to the first embodiment and the can 420a according to the second embodiment with reference to FIGS. 7 to 10 , there is a difference in the shape of the extension part.

Hereinafter, in describing the rotor 400, the can 420 according to the first embodiment will be primarily described.

3 and 4, the rotor 400 includes a rotor part 410 including a rotor core 411 and a plurality of magnets 412, and a can disposed in contact with the rotor part 410 ( 420) may be included.

The rotor unit 410 may be formed of a surface permanent magnet (SPM) type in which a magnet 412 is attached to the surface of the rotor core 411 . At this time, the magnets 412 may be spaced apart from each other at predetermined intervals along the circumferential direction of the rotor core 411 based on the center C.

The rotor core 411 may be implemented in a form 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 411 may be formed in a cylindrical shape, and a hole to which the shaft 500 is coupled may be formed at the center (C).

The magnet 412 forms a rotating magnetic field with the coil 330 wound around the stator core 310 of the stator 300 . Accordingly, the rotor 400 rotates due to the electrical interaction between the coil 330 and the magnet 412, and the shaft 500 rotates in conjunction with the rotation of the rotor 400, thereby increasing the driving force of the motor. occurs Here, the magnet 412 of the rotor 400 may be called a drive magnet.

A plurality of magnets 412 may be spaced apart from each other along the circumferential direction on the outer circumferential surface of the rotor core 411 .

Since one side of the can 420 is supported by the rotor unit 410 and the other side is supported by the first bearing 700, the can 420 can elastically support the first bearing 700. there is.

The can 420 may include a body portion protecting the rotor portion 410 and a support portion extending from the body portion. Also, the support portion may elastically support the first bearing 700 .

Here, the body part includes a first plate part 421 contacting one surface of the rotor part 410 in an axial direction, and a side wall part 422 extending in an axial direction from an outer circumferential surface of the first plate part 421. can do. The support part may include a second plate part 423 and an extension part 424 connecting the first plate part 421 and the second plate part 423 .

The body portion and the support portion may be integrally formed. As shown in FIG. 6 , the first plate portion 421 , the side wall portion 422 , the second plate portion 423 , and the extension portion 424 may be integrally formed.

Referring to FIGS. 3 and 4 , the body portion may be disposed to surround the rotor core 411 to which the magnet 412 is coupled, thereby protecting the rotor portion 410 .

The first plate part 421 may be disposed to come into contact with one surface of the rotor part 410 in the axial direction. Accordingly, in consideration of the contact, the first plate portion 421 may be formed in a plate shape including a plane disposed in a radial direction.

Also, the first plate part 421 may be formed in a ring shape. Accordingly, the first plate portion 421 may include an inner circumferential surface 421a and an outer circumferential surface.

Also, the first plate portion 421 may be disposed to overlap the magnet 412 in an axial direction. Accordingly, the first plate portion 421 may cover the lower surface of the magnet 412 to protect the lower surface of the magnet 412 from external stimuli.

The side wall portion 422 may be formed in a pipe shape extending in an axial direction from an outer circumferential surface of the first plate portion 421 . Accordingly, the first plate portion 421 may be formed to extend inwardly from the lower end of the sidewall portion 422 .

Also, the side wall portion 422 may overlap the rotor portion 410 in a radial direction. At this time, the axial length (L) of the side wall portion 422 may be the same as the axial length (L) of the rotor portion 410.

The second plate part 423 may be spaced apart from the first plate part 421 at a predetermined distance D in an axial direction.

Also, the second plate portion 423 may contact the inner ring 710 of the first bearing 700 . In detail, the second plate portion 423 may contact the upper surface of the inner ring 710 . In this case, the radial width W1 of the second plate portion 423 may be greater than the radial width W2 of the inner ring 710 . Accordingly, the second plate part 423 can easily support the inner ring 710 .

In addition, the second plate portion 423 may be disposed on an outer circumferential surface of the shaft 500 to be movable along the shaft 500 . Accordingly, the shaft 500 may guide the movement of the second plate part 423 in the axial direction.

In addition, the second plate portion 423 is formed in a ring shape to uniformly support the inner ring 710 . Here, the second plate portion 423 is formed in a ring shape as an example, but is not necessarily limited thereto. For example, the second plate part 423 may be formed in an arc shape, and one end of the extension part 424 may be connected to the arc-shaped second plate part 423 .

Also, the radius of the second plate portion 423 may be smaller than that of the first plate portion 421 . Accordingly, the first plate part 421 and the second plate part 423 may be connected by an extension part 424 .

The extension part 424 is disposed between the first plate part 421 and the second plate part 423 and may be formed to have a predetermined inclination angle with respect to an axial direction. Accordingly, the second plate portion 423 may elastically support the first bearing 700 .

In addition, a plurality of extension parts 424 may be formed to uniformly elastically support the first bearing 700 . Here, the plurality of extension parts 424 may be spaced apart from each other along the circumferential direction. In this case, the plurality of extension parts 424 may be arranged rotationally symmetrically with respect to the center (C). As shown in FIG. 7 , the four extension parts 424 may be arranged rotationally symmetrically at intervals of 90 degrees with respect to the center C.

On the other hand, according to the specifications of the motor according to the customer's request, the specifications of the bearing may be changed.

In order to respond to such a change in bearing specifications, the motor may adjust the elastic restoring force or the like by changing the shape of the extension part 424 . For example, when viewed in the axial direction, the extension portion 424 may be formed by a combination of a straight portion and a curved portion, or may be formed using only one of the straight portion and the curved portion.

As shown in FIG. 7 , the extension part 424 may be formed by a combination of a straight part and a curved part. In detail, it may be formed in a shape in which the curved portion is disposed between the two straight portions.

As shown in FIG. 9 , the extension part 424 may be formed with only a straight part.

Also, the extension part 424 may be formed only with a curved part. For example, the extension part 424 may be formed in a spiral shape.

Therefore, as shown in FIGS. 7 and 9 , the shape of the extension part 424 may be modified to correspond according to bearing specifications.

At this time, the second plate part 423 can support the outer race 720, but considering the degree of design freedom of the extension part 424 to which elastic restoring force according to bearing specifications is applied, the second plate part 423 It is preferable to support the inner ring 710.

Referring to FIG. 7 , the extension 424 of the can 420 according to the first embodiment may include a curved surface 424-1. Here, the curved surface 424-1 may be one surface of the extension part 424 disposed in the circumferential direction.

As the curved surface 424-1 is formed, the entire length of the extension part 424 is longer than that of the extension part 424a of the can 420a according to the second embodiment. Accordingly, the extension part 424 including the curved surface 424-1 makes it possible to provide various designs of cans to which elastic restoring force is applied.

Referring to FIG. 9 , the extension 424a of the can 420 according to the second embodiment may be formed in a linear bar shape. In this case, as shown in FIG. 10 , the extension part 424a may be formed to be linearly inclined. Accordingly, the extension part 424a of the can 420a according to the second embodiment can apply a greater elastic restoring force to the bearing 700 than the extension part 424 of the can 420 according to the first embodiment. there is.

The shaft 500 may be rotatably disposed inside the housing 100 by bearings 700 and 800 . Also, the shaft 500 may rotate together with the rotation of the rotor 400 .

Also, the shaft 500 may be coupled to a hole formed in the center of the rotor core 411 in a press-fitting manner.

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

Also, the bus bar 600 may be electrically connected to the coil 330 of the stator 300. In addition, the bus bar 600 may be electrically connected to an external power transmission device such as a connector through a hole formed in the cover 200 .

Referring to FIG. 1 , the bus bar 600 may include a bus bar holder 610 and a plurality of terminals 620 disposed on the bus bar holder 610 . Here, the bus bar holder 610 may be called a bus bar body.

The bus bar holder 610 may be formed in a shape having a predetermined axial thickness.

In addition, the bus bar holder 610 may be formed in an annular shape in which a hole is formed in the center in an axial direction.

In addition, the bus bar holder 610 may be formed of a synthetic resin material such as resin. And, the bus bar holder 610 may be formed through an injection molding method. For example, the bus bar 600 may be formed by injecting a molded product into a plurality of terminals 620 to form the bus bar holder 610 .

That is, the bus bar holder 610 may be a molded product formed through injection molding of an insulating material. Also, during injection molding of the bus bar holder 610, insulation performance can be secured because a mold material is filled between the terminals 620. Accordingly, the bus bar holder 610 may physically and electrically separate the plurality of terminals 620 .

The terminal 620 may electrically connect the coil 330 of the stator 300 and an external power source. For example, since an end of the terminal 620 may pass through the cover 200 and be exposed to the outside, the terminal 620 may connect the coil 330 and an external power source. Here, the terminal 620 may be formed of a metal material.

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 will variously modify and change 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 done.

100: housing
200: cover
300: stator
400: rotor
411: rotor core 412: magnet
420, 420a: can
500: shaft
600: bus bar

Claims (13)

housing;
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 rotor includes a rotor part including a rotor core and a magnet, and a can disposed in contact with the rotor part,
The can includes a body portion disposed to surround the rotor portion and a support portion extending from the body portion,
The motor support elastically supports the bearing. According to claim 1,
The support portion elastically supports the inner ring of the bearing. housing;
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 and spaced apart from the rotor in an axial direction,
The rotor includes a rotor part including a rotor core and a magnet, and a can disposed in contact with the rotor part,
The can
a first plate portion contacting the rotor portion;
a second plate part disposed to be spaced apart from the first plate part in an axial direction; and
An extension portion connecting the first plate portion and the second plate portion,
The second plate portion of the motor in contact with the bearing. According to claim 3,
The bearing includes an inner race, an outer race, and a ball disposed between the inner race and the outer race,
The second plate portion of the motor in contact with the inner race. According to claim 4,
A radial width (W1) of the second plate portion is greater than a radial width (W2) of the inner ring. According to claim 4,
Wherein the second plate portion is disposed on the shaft to be movable along the shaft. According to claim 6,
The motor of the second plate portion is formed in a ring shape. According to claim 3,
The extension part motor including a curved surface. According to claim 3,
The motor extension portion is formed in a linear bar shape. According to claim 8 or 9,
A plurality of extensions are formed,
The plurality of extensions are rotationally symmetrical with respect to the center (C) of the motor. According to claim 3,
The first plate portion is disposed to overlap the magnet in an axial direction. According to claim 3,
The can further includes a side wall portion extending in an axial direction from an outer circumferential surface of the first plate portion,
The axial length of the side wall portion is equal to the axial length of the rotor portion. a rotor part including a rotor core and a magnet; And a can disposed in contact with the rotor unit,
The can
A first plate part and a second plate part disposed to be spaced apart from each other with a predetermined distance (D);
an extension portion connecting the first plate portion and the second plate portion; and
And a side wall portion extending from the outer circumferential surface of the first plate portion,
The first plate portion of the rotor in contact with the rotor portion.

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