KR102682570B1 - Motor - Google Patents

Abstract

The present invention relates to a stator; a rotor disposed within the stator; and a shaft coupled to the rotor, wherein the rotor includes a rotor core including a first pocket, a magnet, and a plate, wherein the plate includes a second pocket and a protrusion disposed to protrude from the second pocket. It includes, the first pocket and the second pocket are aligned, the magnet is disposed in the first pocket and the second pocket, and the protrusion is disposed to overlap the magnet in the radial direction. can be provided.

Description

Motor{Motor}

The embodiment relates to a motor.

A motor includes a shaft, rotor, and stator. A plurality of magnets may be disposed on the rotor. It is divided into IPM (Inner Permanent Magnet) motors, in which a magnet is inserted and coupled to the inside of the rotor core, and SPM (Surface Permanent Magnet) motors, in which a magnet is attached to the surface of the rotor core.

Among IPM motors, there is a spoke type motor. In the case of a spoke-type motor, magnets that are longer than wide are arranged radially. Magnets may be placed in pockets of the rotor core. This spoke type motor is characterized by high power density. In a spoke-type motor, protrusions are placed on the outside of the pocket of the rotor core to prevent the magnet from coming off. However, there is a problem in that magnetic flux leaks through these protrusions.

Public Patent Publication No. 10-2018-0020030 (2018.02.27)

Accordingly, the embodiment is intended to solve the above problems, and its purpose is to provide a motor that can prevent the magnet from leaving while preventing leakage of the magnetic flux of the magnet.

An embodiment for achieving the above object includes a stator, a rotor disposed in the stator, and a shaft coupled to the rotor, and the rotor includes a rotor core including a first pocket, a magnet, and a plate. And, the plate includes a second pocket and a protrusion disposed to protrude from the second pocket, the first pocket and the second pocket are arranged to be aligned, and the magnet is disposed in the first pocket and the second pocket. and the protrusion may be disposed to overlap the magnet in the radial direction.

Preferably, the first pocket and the second pocket have a radial length greater than a circumferential width, the first pocket has a shape with one side open, and the protrusion protrudes from the second pocket in the axial direction. , may be placed on one open surface of the first pocket.

Preferably, the protrusion includes a first protrusion and a second protrusion. The first protrusion may be disposed to protrude from the second pocket to one side, and the second protrusion may be disposed to protrude from the second pocket to the other side.

Preferably, the plate includes a first plate and a second plate, the first plate includes a 2-1 pocket and a first protrusion protruding from the 2-1 pocket, and the second plate includes It may include a 2-2 pocket and a second protrusion protruding from the 2-2 pocket, and the first plate and the second plate may be stacked in the axial direction.

Preferably, the 2-1 pocket and the 2-2 pocket may have different positions in the circumferential direction.

The embodiment includes a stator, a rotor disposed within the stator, and a shaft coupled to the rotor, wherein the rotor includes a first rotor core, a second rotor core, a magnet, and a plate, and rotates in the axial direction. In this way, the plate is disposed between the first rotor core and the second rotor core, the magnet is disposed through the plate, and the plate protrudes in the axial direction and includes a protrusion disposed outside the magnet. We can provide a motor that does this.

Preferably, the first rotor core includes a 1-1 pocket, the second rotor core includes a 1-2 pocket, and the plate includes a second pocket, and the 1-1 pocket and the 1-2 pocket and the second pocket may be arranged in alignment, and the magnet may be arranged in the 1-1 pocket and the 1-2 pocket.

Preferably, the 1-1 pocket, the 1-2 pocket, and the second pocket have a radial length greater than a circumferential width, and each of the 1-1 pocket and the 1-2 pocket has one side. It has an open shape, and the protrusion may be disposed on an open surface of the 1-1 pocket and an open surface of the 1-2 pocket, respectively.

Preferably, the protrusion includes a first protrusion and a second protrusion. The first protrusion may be disposed to protrude from the second pocket to one side, and the second protrusion may be disposed to protrude from the second pocket to the other side.

Preferably, the plate includes a first plate and a second plate, the first plate includes a 2-1 pocket and a first protrusion protruding from the 2-1 pocket, and the second plate includes It may include a 2-2 pocket and a second protrusion protruding from the 2-2 pocket, and the first plate and the second plate may be stacked in the axial direction.

According to the embodiment, the advantageous effect of preventing the magnet from being separated while preventing leakage of the magnetic flux of the magnet is provided.

According to the embodiment, the advantageous effect of preventing leakage of magnetic flux of the magnet and reducing cogging torque is provided.

1 is a cross-sectional view showing a motor according to an embodiment;
2 is an exploded view showing the rotor;
Figure 3 is a perspective view showing the plate shown in Figure 2;
Figure 4 is a side cross-sectional view of the rotor shown in Figure 2;
Figure 5 is a perspective view showing a modification of the plate shown in Figure 3;
Figure 6 is a perspective view showing a modified example of the rotor shown in Figure 1;
Figure 7 is a perspective view showing the plate and column shown in Figure 6;
Figure 8 is a side cross-sectional view of the rotor shown in Figure 2;
Figure 9 is a diagram showing a state in which the protrusion prevents the magnet from leaving;
Figure 10 is a perspective view showing a modified example of the plate and column shown in Figure 7;
Figure 11 is a side cross-sectional view of a rotor applied to a modification of the plate and column shown in Figure 7;
Figure 12 is a perspective view showing another modification of the rotor shown in Figure 1;
Figure 13 is a perspective view showing the plate shown in Figure 12;
14 is a view showing a second pocket and an extension portion;
Figure 15 is a diagram showing the process of inserting a magnet into a second pocket;
Figure 16 is a diagram showing the bending process of the extension part;
Figure 17 is a side cross-sectional view of the rotor shown in Figure 12;
Figure 18 is a perspective view showing a modification of the plate shown in Figure 12.

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, order, 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', 'combined', or 'connected' due to 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 can include not only the upward direction but also the downward direction based on one component.

1 is a cross-sectional view showing a motor according to an embodiment. below. In the drawing, the z-axis represents the axial direction of the motor, and the y-axis represents the radial direction of the motor.

Referring to FIG. 1, a motor according to an embodiment may include a shaft 100, a rotor 200, and a stator 300.

Shaft 100 may be coupled to rotor 200. When electromagnetic interaction occurs between the rotor 200 and the stator 300 through current supply, the rotor 200 rotates and the shaft 100 rotates in conjunction with this.

The rotor 200 may be disposed outside the shaft 100. The rotor 200 rotates through electrical interaction with the stator 300.

The stator 300 is disposed outside the rotor 200. The stator 300 may include a stator core 310, an insulator 320, and a coil 330. The insulator 320 is mounted on the stator core 310. The coil 330 is wound around the insulator 320.

Figure 2 is an exploded view showing the rotor.

Referring to FIG. 2, the rotor 200 may include a rotor core 210, a magnet 220, and a plate 230.

The rotor core 210 may include a first pocket (P1). The first pocket P1 may have an open outer shape. Additionally, the radial length of the first pocket P1 may be greater than the circumferential width. There are a plurality of first pockets P1. The plurality of first pockets P1 may be arranged at regular intervals in the circumferential direction of the rotor core 210. Additionally, the plurality of first pockets P1 may be arranged in a radial direction based on the center of the rotor core 210. A magnet 220 is disposed in this first pocket (P1). There is no protruding portion of the rotor core 210 near the outer edge S1 of the first pocket P1. Accordingly, the risk of magnetic flux of the magnet 220 leaking through the protruding portion of the rotor core 210 near the outer edge of the first pocket P1 is fundamentally eliminated.

The rotor core 210 may include a first rotor core 210A and a second rotor core 210B. The first pocket (P1) can be divided into a 1-1 pocket (P1A) and a 1-2 pocket (P1B). The first rotor core 210A and the second rotor core 210B are coaxially coupled. The first rotor core 210A may include a 1-1 pocket P1A. And the second rotor core 210B may include a 1-2 pocket (P1B).

The plate 230 may be disposed between the first rotor core 210A and the second rotor core 210B in the axial direction. Plate 230 may include a second pocket (P2). The second pocket (P2) corresponds to the shape and size of the first pocket (P1). A plurality of second pockets P2 may be arranged at regular intervals in the circumferential direction of the plate 230. Additionally, the plurality of second pockets P2 may be arranged in a radial direction based on the center of the plate 230. The second pocket (P2) is aligned with the 1-1 pocket (P1A) in the circumferential direction of the rotor core 210. Alternatively, the second pocket (P2) is aligned with the 1-2 pocket (P1B) in the circumferential direction of the rotor core 210.

The magnet 220 may be disposed in the 1-1 pocket (P1A) and the 1-2 pocket (P1B) by penetrating the second pocket (P2) in the axial direction. The magnet 220 is inserted into the 1-1 pocket (P1A), penetrates the second pocket (P2), and is inserted into the 1-2 pocket (P1B). The cross-sectional shape of the magnet 220 corresponds to the shape of the first pocket (P1) and the second pocket (P2).

An upper plate 240 may be disposed on the upper side of the first rotor core 210A. A lower plate 250 may be disposed on the lower side of the second rotor core 210B. A groove 241 corresponding to the 1-1 pocket P1A may be disposed in the upper plate 240. Additionally, a groove 251 corresponding to the 1-2 pocket P1B may be disposed in the lower plate 250.

Figure 3 is a perspective view showing the plate shown in Figure 2.

Referring to FIGS. 2 and 3 , the plate 230 may include a disk-shaped base 231 and protrusions 232 and 233. Plate 230 may be made of a non-magnetic material. The base 231 includes a hole 231a at its center. The hole 231a is where the shaft 100 penetrates. The base 231 may include a plurality of second pockets P2. Each second pocket P2 is provided with protrusions 232 and 233. The protrusions 232 and 233 protrude in the axial direction from the second pocket P2. Based on the radial direction of the plate 230, it may be disposed at the outer edge of the second pocket P2. When the magnet 220 penetrates the second pocket P2, the protrusions 232 and 233 are located outside the magnet 220.

The protrusions 232 and 233 may include a first protrusion 232 and a second protrusion 233. The first protrusion 232 is disposed to protrude from the base 231 in one direction. The second protrusion 233 is disposed to protrude from the base 231 in the other direction. The first protrusion 232 and the second protrusion 233 may have a flat or curved plate shape. The width of the first protrusion 232 and the width of the second protrusion 233 may be the same and may correspond to the width of the second pocket P2. The axial height of the first protrusion 232 and the axial height of the second protrusion 233 may be within 1/3 of the axial height of the magnet 220.

The shape and size of the first protrusion 232 and the second protrusion 233 may be the same, but are not limited thereto, and the number of magnets 220, the position of the plate 230, and the number of rotor cores 210 They may differ from each other considering such factors.

Figure 4 is a side cross-sectional view of the rotor shown in Figure 2.

2 to 4, the base 231 is disposed between the first rotor core 210A and the second rotor core 210B. The first protrusion 232 and the second protrusion 233 are disposed on the outside of the magnet 220. And the first protrusion 232 may be located in the 1-1 pocket P1A of the first rotor core 210A. The second protrusion 233 may be located in the 1-2 pocket P1B of the second rotor core 210B. In the drawing, both the first protrusion 232 and the second protrusion 233 are shown, but the present invention is not limited thereto, and only one of the first protrusion 232 and the second protrusion 233 may be disposed.

The first protrusion 232 and the second protrusion 233 form an overlap area (O1 in FIG. 4) with the magnet 220 in a radial direction, respectively. Since the first pocket P1 is open on the outside and has no separate protruding structure, the magnet 220 disposed in the first pocket P1 may be separated from the rotor core 210 in the radial direction. The first protrusion 232 and the second protrusion 233 serve to physically prevent the magnet 220 from being separated from the first pocket P1.

Figure 5 is a perspective view showing a modification of the plate shown in Figure 3.

Referring to FIG. 5, the plate 230 may be formed by combining a first plate 230A and a second plate 230B. The second pocket (P2) may be a combination of the 2-1 pocket (P2A) and the 2-2 pocket (P2B). The magnet 220 may be a combination of the first magnet 220A and the second magnet 220B.

The first plate 230A may include a first base 231A and a first protrusion 232A. A plurality of 2-1 pockets (P2A) are provided in the first base 231A. The first protrusion 232A may protrude in one direction from the 2-1 pocket P2A.

The second plate 230B may include a second base 231B and a second protrusion 232B. A plurality of 2-2 pockets (P2B) are provided in the second base 231B. The second protrusion 232B may protrude in one direction from the 2-2 pocket P2B.

The first base 231A and the second base 231B are stacked in the axial direction and coaxially coupled.

The plate 230 can implement skew of the rotor 200. The first magnet 220A may be inserted into the 2-1 pocket P2A from the upper side of the first plate 230A. And the second magnet 220B may be inserted into the 2-2 pocket P2B from the lower side of the second plate 230B. At this time, based on the circumferential direction, the positions of the 2-1 pocket (P2A) and the positions of the 2-2 pocket (P2B) may be arranged deviated by the skew angle (T1). Accordingly, the first magnet 220A and the second magnet 220B are disposed offset by the skew angle T1. This has the advantage of reducing the cogging torque of the motor.

Figure 6 is a perspective view showing a modified example of the rotor shown in Figure 1.

Referring to FIG. 6, the rotor 1200 may include a rotor core 1210, a magnet 1220, a plate 1230, and a column 1240. There are multiple rotor cores 1210. The plurality of rotor cores 1210 are separate parts. A plurality of rotor cores 1210 are arranged at regular intervals along the circumferential direction. A space S2 is formed between the rotor core 1210 and the rotor core 1210 in the circumferential direction. The magnet 1220 is inserted into this space (S2). The space S2 may be arranged in a radial direction based on the center of the rotor 1200. The space S2 may have a radial length greater than a circumferential width.

There is no protruding part of the rotor core 1210 near the outer edge S3 of the rotor core 1210, which is the boundary of the space S2. Accordingly, the risk of magnetic flux of the magnet 1220 leaking through the protruding portion of the rotor core 1210 near the outer edge S3 of the rotor core 1210 is fundamentally eliminated.

The rotor core 1210 may include a first rotor core 1210A and a second rotor core 1210B. The first rotor core 1210A and the second rotor core 1210B are coaxially coupled. There are multiple first rotor cores 1210A. And there are a plurality of second rotor cores 1210B. The plurality of first rotor cores 1210A include a first space S2A disposed between the first rotor core 1210A and the first rotor core 1210A. The plurality of second rotor cores 1210B includes a second space S2B disposed between the second rotor cores 1210B and the second rotor cores 1210B.

The plate 1230 may be disposed between the first rotor core 1210A and the second rotor core 1210B in the axial direction. The plate 1230 may be disposed to extend radially from the column 1240. Plate 1230 may include pockets. The pocket corresponds to the shape and size of space (S2). A plurality of pockets P3 may be arranged at regular intervals in the circumferential direction of the plate 1230. Additionally, the plurality of pockets P3 may be arranged in a radial direction based on the center of the plate 1230. The pocket P3 is aligned with the first space S2A in the circumferential direction of the rotor core 1210. Alternatively, the pocket P3 is aligned with the second space S2B in the circumferential direction of the rotor core 1210.

The magnet 1220 may be disposed in the first space S2A and the second space S2B in the axial direction through the pocket P3. The magnet 1220 is inserted into the first space S2A, penetrates the pocket P3, and is inserted into the second space S2B. The cross-sectional shape of the magnet 1220 corresponds to the shapes of the space S2 and the pocket P3.

Column 1240 may be integrated with plate 1230. It is disposed outside the shaft of the column 1240 and inside the rotor core 1210.

Figure 7 is a perspective view showing the plate and column shown in Figure 6.

Referring to FIGS. 6 and 7 , the plate 1230 may include a disk-shaped base 1231 and protrusions 1232 and 1233. Plate 1230 may be made of a non-magnetic material. The base 1231 may include a plurality of pockets (P3). Each pocket P3 is provided with protrusions 1232 and 1233. Protrusions 1232 and 1233 protrude axially from pocket P3. Based on the radial direction of the plate 1230, it may be placed at the outer edge of the pocket P3. With the magnet 1220 penetrating the pocket P3, the protrusions 1232 and 1233 are located outside the magnet 1220.

The protrusions 1232 and 1233 may include a first protrusion 1232 and a second protrusion 1233. The first protrusion 1232 is disposed to protrude from the base 1231 in one direction. The second protrusion 1233 is disposed to protrude from the base 1231 in the other direction. The first protrusion 1232 and the second protrusion 1233 may have a flat or curved plate shape. The width of the first protrusion 1232 and the width of the second protrusion 1233 may be the same and may correspond to the width of the pocket P3. The shape and size of the first protrusion 1232 and the second protrusion 1233 may be the same, but are not limited thereto, and the number of magnets 1220, the position of the plate 1230, and the number of rotor cores 1210 They may differ from each other considering such factors. The axial height of the first protrusion 1232 and the axial height of the second protrusion 1233 may be within 1/3 of the axial height of the magnet 1220.

Column 1240 includes a hole 1241 at its center. Hole 1241 is where the shaft penetrates. Column 1240 may be a hollow cylindrical member disposed long in the axial direction. The column 1240 and plate 1230 may be injection molded mold members. The column 1240 fixes the plurality of rotor cores 1210 and fixes the rotor cores 1210 and the shaft. The column 1240 can secure a large fixing force by increasing the contact area with the shaft 100.

Figure 8 is a side cross-sectional view of the rotor shown in Figure 2, and Figure 9 is a diagram showing a state in which the protrusion prevents the magnet from being separated.

6 to 9, the base 1231 is disposed between the first rotor core 1210A and the second rotor core 1210B. The first protrusion 1232 and the second protrusion 1233 are disposed outside the magnet 1220. And the first protrusion 1232 may be located in the first space S2A of the first rotor core 1210A. The second protrusion 1233 may be located in the second space S2B of the second rotor core 1210B. In the drawing, both the first protrusion 1232 and the second protrusion 1233 are shown, but the present invention is not limited thereto, and only one of the first protrusion 1232 and the second protrusion 1233 may be disposed.

The first protrusion 1232 and the second protrusion 1233 form an overlap area O2 with the magnet 1220 in a radial direction, respectively. Since the space S2 between the rotor core 1210 and the rotor core 1210 is open on the outside and has no separate protruding structure, the magnet 1220 disposed in the space S2 is attached to the rotor core 1210. It may deviate in the radial direction. The first protrusion 1232 and the second protrusion 1233 serve to physically prevent the magnet 1220 from being separated between the rotor core 1210 and the rotor core 1210.

FIG. 10 is a perspective view showing a modification of the plate and column shown in FIG. 7, and FIG. 11 is a side cross-sectional view of the rotor applied to the modification of the plate and column shown in FIG. 7.

Referring to FIGS. 10 and 11 , the plate 1230 may be formed by combining a first plate 1230A and a second plate 1230B. The pocket (P3) may be a combination of the first pocket (P3A) and the second pocket (P3B). The magnet 1220 may be a combination of the first magnet 1220A and the second magnet 1220B. Column 1240 may be a combination of a first column 1240A and a second column 1240B.

The first plate 1230A may include a first base 1231A and a first protrusion 1232A. A plurality of first pockets (P3A) are provided in the first base (1231A). The first protrusion 1232A may protrude in one direction from the first pocket P3A. The first column 1240A is disposed to protrude from one side of the first plate 1230A.

The second plate 1230B may include a second base 1231B and a second protrusion 1232B. A plurality of second pockets (P3B) are provided in the second base (1231B). The second protrusion 1232B may protrude in one direction from the second pocket P3B. The first column 1240A is disposed to protrude to the other side of the second plate 1230B.

The first base 1231A and the second base 1231B are stacked in the axial direction and coaxially coupled.

The plate 1230 can implement skew of the rotor 1200. The first magnet 1220A may be inserted into the first pocket P3A from the upper side of the first plate 1230A. And the second magnet 1220B may be inserted into the second pocket P3B from the lower side of the second plate 1230B. At this time, based on the circumferential direction, the positions of the first pocket (P3A) and the positions of the second pocket (P3B) may be arranged deviated by the skew angle (T2). Accordingly, the first magnet 1220A and the second magnet 1220B are disposed skewed by the skew angle T2. This has the advantage of reducing the cogging torque of the motor.

FIG. 12 is a perspective view showing another modification of the rotor shown in FIG. 1.

Referring to FIG. 12, the rotor 200 may include a rotor core 210, a magnet 220, and a plate 2230.

The rotor core 210 may include a first pocket (P1). The first pocket P1 may have an open outer shape. Additionally, the radial length of the first pocket P1 may be greater than the circumferential width. There are a plurality of first pockets P1. The plurality of first pockets P1 may be arranged at regular intervals in the circumferential direction of the rotor core 210. Additionally, the plurality of first pockets P1 may be arranged in a radial direction based on the center of the rotor core 210. A magnet 220 is disposed in this first pocket (P1). There is no protruding portion of the rotor core 210 near the outer edge S1 of the first pocket P1. Accordingly, the risk of magnetic flux of the magnet 220 leaking through the protruding portion of the rotor core 210 near the outer edge S1 of the first pocket P1 is fundamentally eliminated.

The rotor core 210 may include a first rotor core 210A and a second rotor core 210B. The first pocket (P1) can be divided into a 1-1 pocket (P1A) and a 1-2 pocket (P1B). The first rotor core 210A and the second rotor core 210B are coaxially coupled. The first rotor core 210A may include a 1-1 pocket P1A. And the second rotor core 210B may include a 1-2 pocket (P1B).

The plate 2230 may be disposed between the first rotor core 210A and the second rotor core 210B in the axial direction. Plate 2230 may include a second pocket (P4). The second pocket (P4) corresponds to the shape and size of the first pocket (P1). A plurality of second pockets P4 may be arranged at regular intervals in the circumferential direction of the plate 2230. Additionally, the plurality of second pockets P4 may be arranged in a radial direction based on the center of the plate 2230. The second pocket (P4) is aligned with the 1-1 pocket (P1A) in the circumferential direction of the rotor core 210. Alternatively, the second pocket (P4) is aligned with the 1-2 pocket (P1B) in the circumferential direction of the rotor core 210.

The magnet 220 may be disposed in the 1-1 pocket (P1A) and the 1-2 pocket (P1B) by penetrating the second pocket (P4) in the axial direction. The magnet 220 is inserted into the 1-1 pocket (P1A), penetrates the second pocket (P4), and is inserted into the 1-2 pocket (P1B). The cross-sectional shape of the magnet 220 corresponds to the shape of the first pocket (P1) and the second pocket (P4).

Figure 13 is a perspective view showing the plate shown in Figure 12.

Referring to FIGS. 12 and 13 , the plate 2230 may include a disk-shaped base 2231 and an extension portion 2232. The plate 2230 is deformable and may be made of a non-magnetic metal material. The base 2231 includes a hole 2231a at its center. The hole 2231a is where the shaft 100 penetrates. The base 2231 may include a plurality of second pockets P4. An extension portion 2232 is provided in each second pocket P4. The extension portion 2232 is bent in the axial direction and extends from the second pocket P4. The extension portion 2232 may be disposed at the edge of the second pocket P4. With the magnet 220 penetrating the second pocket P4, the extension portion 2232 contacts the outside of the magnet 220.

Figure 14 is a diagram showing the second pocket and the extension part, Figure 15 is a diagram showing the process of inserting the magnet into the second pocket, and Figure 16 is a diagram showing the bending process of the extension part.

14 and 15, the extension portion 2232 extends from the second pocket P4. And, the extension portion 2232 extends inside the second pocket P4. Before the magnet 220 penetrates the second pocket P4, the extension portion 2232 is disposed along the edge of the second pocket P4. A fracture inducing portion (C) may be provided in the extension portion 2232. The fracture inducing portion (C) may be arranged extending from the edge of the extension portion (2232) to the edge of the second pocket (P4). The fracture inducing portion (C) is a place where the fracture occurs when an external force exceeding a certain level is applied.

In the second pocket P4 having a square planar shape, there may be four fracture inducing portions C, and the extension portion 2232 may be composed of a first part 2232_1 and a second part 2232_2. The pair of first parts 2232_1 may be arranged to face each other in the radial direction. The pair of second parts 2232_2 may be arranged to face each other in the circumferential direction.

Referring to FIGS. 15 and 16, when the magnet 220 is inserted into the second pocket (P4), the fracture inducing portion (C) is broken due to the force pushing the magnet 220, and the extension portion 2232 is the first pocket (P4). It is divided into part (2232_1) and second part (2232_2). When the magnet 220 penetrates the second pocket P4, the first part 2232_1 and the second part 2232_2 are bent and come into contact with the outer surface of the magnet 220. As the first part 2232_1 and the second part 2232_2 are bent, the contact area between the extension part 2232 and the magnet 220 increases. Because the magnet 220 and the extension portion 2232 are in surface contact, the fixing force between the magnet 220 and the plate 2230 is high. In particular, there is an advantage that the fixing force of the magnet 220 and the plate 2230 is higher due to the restoring force of the bent first part 2232_1 and the second part 2232_2.

In the drawing, both the first part 2232_1 and the second part 2232_2 are disclosed as the extension 2232, but the present invention is not limited thereto, and only one of the first part 2232_1 and the second part 2232_2 is used. It can be provided.

FIG. 17 is a side cross-sectional view of the rotor shown in FIG. 12.

Referring to FIG. 17, the extension portion 2232 forms an overlap area O3 with the magnet 220 in a radial direction, respectively. The extension portion 2232 increases the contact area with the magnet 220. Accordingly, without press-fitting the magnet 220 into the first pocket P1 of the rotor core 210, the magnet 220 may be placed in the first pocket P1 so as to be spaced apart from the rotor core 210. Since the magnet 220 does not contact the rotor core 210, but only the extension portion 2232, it has the advantage of preventing damage to the magnet 220 during the process of mounting the magnet 220 on the rotor core 210. There is.

Referring to FIGS. 12 and 17 , the circumferential width D2 of the 1-2 pocket P1B may be larger than the circumferential width D1 of the 1-1 pocket P1A. This is to secure the bending space (G) of the extension portion 2232.

FIG. 18 is a perspective view showing a modification of the plate 2230 shown in FIG. 12.

Referring to FIG. 18, the plate 2230 may be formed by combining a first plate 2230A and a second plate 2230B. The second pocket (P4) may be a combination of the 2-1 pocket (P4A) and the 2-2 pocket (P4B). The magnet 220 may be a combination of the first magnet 220A and the second magnet 220B.

The first plate 2230A may include a first base 2231A and a first extension 2232A. A plurality of 2-1 pockets (P4A) are provided in the first base (2231A). The first extension portion 2232A may extend in one direction from the 2-1 pocket P4A and be bent.

The second plate 2230B may include a second base 2231B and a second extension portion 2232B. A plurality of 2-2 pockets (P4B) are provided in the second base (2231B). The second extension portion 2232B may extend from the 2-2 pocket P4B in one direction and be bent.

The first base 2231A and the second base 2231B are stacked in the axial direction and coaxially coupled.

This plate 2230 can implement skew of the rotor 200. The first magnet 220A may be inserted into the 2-1 pocket P4A from the upper side of the first plate 2230A. And the second magnet 220B may be inserted into the 2-2 pocket P4B from the lower side of the second plate 2230B. At this time, based on the circumferential direction, the positions of the 2-1 pocket (P4A) and the positions of the 2-2 pocket (P4B) may be arranged deviated by the skew angle (T3). Accordingly, the first magnet 220A and the second magnet 220B are disposed offset by the skew angle T3. This has the advantage of reducing the cogging torque of the motor.

Above, the motor according to a preferred embodiment of the present invention has been examined in detail with reference to the attached drawings.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications, changes, and substitutions can be made by those skilled in the art without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the attached drawings are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments and the attached drawings. . The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

100: shaft
200,1200: rotor
210,1210: rotor core
220,1220: Magnet
230,1230,2230: Plate
231,1231,2231: Base
232,233,1232,1233: Protrusion
300: Stator
1240: column
2232: Extension

Claims (10)

stater;
a rotor disposed inside the stator; and
Includes a shaft coupled to the rotor,
The rotor includes a rotor core including a first pocket, a magnet, and a plate,
The plate includes a second pocket and a protrusion disposed to protrude from the second pocket,
The first pocket and the second pocket are arranged in alignment,
The magnet is disposed in the first pocket and the second pocket,
The protrusion is disposed to overlap the magnet in a radial direction,
The protrusion protrudes axially from the outer edge of the second pocket in the radial direction so as to contact an outer portion of the magnet in the radial direction when the magnet is disposed in the first pocket and the second pocket,
The protrusion is disposed on an outer periphery of the plate so as to overlap the magnet and the second pocket in a radial direction. According to claim 1,
The first pocket and the second pocket have a radial length greater than a circumferential width,
The first pocket has a shape with one side open,
The protrusion protrudes in the axial direction from the second pocket and is disposed on one open surface of the first pocket. According to clause 2,
The protrusion includes a first protrusion and a second protrusion,
The first protrusion is disposed to protrude from the second pocket to one side,
The second protrusion is a motor disposed to protrude from the second pocket to the other side. According to claim 1,
The plate includes a first plate and a second plate,
The first plate includes a 2-1 pocket and a first protrusion protruding from the 2-1 pocket,
The second plate includes a 2-2 pocket and a second protrusion protruding from the 2-2 pocket,
A motor wherein the first plate and the second plate are stacked in the axial direction. According to clause 4,
The motor wherein the 2-1 pocket and the 2-2 pocket have different positions in the circumferential direction. stater;
a rotor disposed inside the stator; and
Includes a shaft coupled to the rotor,
The rotor includes a first rotor core, a second rotor core, a magnet, and a plate,
Axially, the plate is disposed between the first rotor core and the second rotor core,
The magnet is disposed to penetrate the plate,
The plate protrudes in the axial direction and includes a second pocket and a protrusion disposed outside the magnet,
The protrusion protrudes axially from the outer edge of the second pocket in the radial direction so as to contact an outer portion of the magnet in the radial direction when the magnet is disposed in the second pocket,
The protrusion is disposed on an outer periphery of the plate so as to overlap the magnet and the second pocket in a radial direction. According to clause 6,
The first rotor core includes a 1-1 pocket,
The second rotor core includes first and second pockets,
The 1-1 pocket, the 1-2 pocket, and the second pocket are arranged in alignment,
The magnet is a motor disposed in the 1-1 pocket and the 1-2 pocket. According to clause 7,
The 1-1 pocket, the 1-2 pocket, and the second pocket have a radial length greater than a circumferential width,
The 1-1 pocket and the 1-2 pocket each have a shape with one side open,
The protrusion is disposed on an open surface of the 1-1 pocket and an open surface of the 1-2 pocket, respectively. According to clause 6,
The protrusion includes a first protrusion and a second protrusion,
The first protrusion is disposed to protrude from the second pocket to one side,
The second protrusion is a motor disposed to protrude from the second pocket to the other side. According to clause 6,
The plate includes a first plate and a second plate,
The first plate includes a 2-1 pocket and a first protrusion protruding from the 2-1 pocket,
The second plate includes a 2-2 pocket and a second protrusion protruding from the 2-2 pocket,
A motor wherein the first plate and the second plate are stacked in the axial direction.

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