KR102449770B1 - Motor - Google Patents

Abstract

The present invention is a rotating shaft; a rotor including a hole in which the rotation shaft is disposed; and a stator disposed on the outside of the rotor, wherein the rotor includes a rotor core surrounding the rotation shaft, and a magnet disposed inside the rotor core, wherein the rotor core includes a pocket in which the magnet is disposed; and a bridge portion disposed between the pocket portion and the pocket portion in a circumferential direction of the rotor core, wherein the bridge portion includes a through hole penetrating an upper surface and a lower surface of the rotor core, and the through hole includes a third communicating with each other. a first hole, a second hole, and a third hole, wherein the second hole is disposed above the first hole and is connected to the upper surface of the rotor core, and the third hole is disposed below the first hole It is possible to provide a motor that is connected to the lower surface of the rotor core, and the size of the second hole and the size of the third hole are larger than the size of the first hole.

Description

motor {Motor}

The present invention relates to a motor.

The motor generates power while rotating through an interaction between a rotor having a plurality of magnets and an electromagnetic force generated by a coil wound around the stator. Accordingly, the motor is provided with a rotating shaft formed rotatably, a rotor coupled to the rotating shaft, and a stator fixed to the inside of the housing, the stator being installed with a gap along the circumference of the rotor. In addition, a coil forming a rotating magnetic field is wound around the stator to induce electrical interaction with the rotor to induce rotation of the rotor. Therefore, when the rotor rotates, the rotating shaft rotates.

A plurality of magnets are installed in the rotor. According to a magnet installation method, an IPM (Inner Permanent Magnet) motor in which a magnet is inserted and coupled to the inside of the rotor core 210 and an SPM in which a magnet is attached to the surface of the rotor core 210 . (Surface Permanent Magnet) It is divided into a rotor.

In the case of an IPM motor, a pocket portion is provided in the rotor core, and a magnet is inserted into the pocket portion. Adhesive is used to secure the magnet to the pocket. An adhesive may be applied to the pocket portion, but there is a problem in that it is very difficult to control the amount of adhesive applied to the pocket portion in the application process. In addition, the adhesive application process has a problem that requires many additional processes and equipment.

Korean Patent Laid-Open Publication No. 10-2004-0042035 (May 20, 2004)

Accordingly, an object of the present invention is to provide a motor capable of fixing a magnet to a pocket portion of a rotor core without using an adhesive to solve the above problems.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned here will be clearly understood by those skilled in the art from the following description.

The present invention for achieving the above object includes a rotation shaft, a rotor including a hole in which the rotation shaft is disposed, and a stator disposed outside the rotor, wherein the rotor includes a rotor core surrounding the rotation shaft, and the rotor core and a magnet disposed inside of the rotor core, wherein the rotor core includes a pocket portion on which the magnet is disposed, and a bridge portion disposed between the pocket portion and the pocket portion in a circumferential direction of the rotor core, wherein the bridge portion includes the rotor. a through hole passing through the upper and lower surfaces of the core, wherein the through hole includes a first hole communicating with each other, a second hole, and a third hole, the second hole being disposed above the first hole to be connected to the upper surface of the rotor core, the third hole is disposed below the first hole to be connected to the lower surface of the rotor core, and the size of the second hole and the size of the third hole are the size of the first hole A larger motor can be provided.

Preferably, the pocket portion is disposed on the side of the pocket portion, and may include a void portion spaced apart from the magnet.

Preferably, in the radial direction of the rotor core, the through hole may be disposed inside the air gap.

Preferably, the through-hole may be disposed between the adjacent pockets, and the through-hole may be disposed close to any one of the adjacent pockets in the circumferential direction of the rotor core.

Preferably, the number of the through-holes may be the same as the number of the magnets.

Preferably, the through hole has a circular shape, and a diameter of the second hole and a diameter of the third hole may be larger than a diameter of the first hole.

Preferably, the through hole has a circular shape, and a diameter of the second hole and a diameter of the third hole may be larger than a diameter of the first hole.

Preferably, the first hole may be circular, and the second hole and the third hole may be non-circular.

Preferably, the first hole has a symmetrical shape, and the second hole and the third hole have an asymmetrical shape.

Preferably, a circle having a radius from the center of the rotor core to the center of the width of the inner surface of the pocket portion is referred to as a first circle, and the distance from the center of the rotor core to the center of width of the outer surface of the pocket portion is the radius Assuming that a circle of , is a second circle, the through hole may be disposed between the first circle and the second circle with respect to the radial direction of the rotor core.

Preferably, the edge disposed on the boundary between the inner surface and the side of the pocket portion may include a curved surface convex toward the inside of the pocket portion.

According to an embodiment of the present invention, in fixing the magnet to the pocket portion of the rotor core, the use of an adhesive is excluded, thereby reducing the manufacturing process of the product and providing an advantageous effect of facilitating quality control.

According to an embodiment of the present invention, there is provided an advantageous effect of preventing the magnet from being separated from the pocket portion of the rotor core in the axial direction of the rotation shaft.

According to an embodiment of the present invention, it provides an advantageous effect of easily aligning the position of the magnet in the pocket portion of the rotor core.

According to an embodiment of the present invention, in the pocket portion of the rotor core, by aligning the positions of the magnets, the balance of the motor is secured, and advantageous effects of reducing noise and vibration are provided.

1 is a side cross-sectional view of a motor according to an embodiment;
2 is a plan view of the rotor shown in FIG. 1;
3 is a view showing a through hole disposed in a bridge portion of the rotor core;
4 is a view showing a through hole in a side cross-sectional view of the rotor core;
5 is a view showing a process of forming a second hole and a third hole of the through hole;
6 is a view showing a state of fixing the magnet in the process of forming a second hole;
7 is a view showing a state of fixing the magnet in the process of forming a third hole;
8 is a plan view of the rotor showing a state in which the magnet is fixed to the pocket portion through the through hole;
9 is a plan view of the rotor showing the position of the through hole.
10 is a view showing a through-hole of an asymmetric shape;
11 is a view illustrating a detailed position of a through hole.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings and preferred embodiments. And in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present invention will be omitted.

Terms including an ordinal number such as second, first, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

1 is a side cross-sectional view of a motor according to an embodiment, and FIG. 2 is a plan view of the rotor shown in FIG. 1 .

1 and 2 , the motor according to the embodiment may include a rotating shaft 100 , a rotor 200 , and a stator 300 .

The rotating shaft 100 may be coupled to the rotor 200 . When electromagnetic interaction occurs between the rotor 200 and the stator 300 through the supply of current, the rotor 200 rotates and the rotating shaft 100 rotates in conjunction therewith.

The rotor 200 rotates through electrical interaction with the stator 300 .

The rotor 200 may include a rotor core 210 and a magnet 220 . The rotor core 210 may be implemented in a shape in which a plurality of plates in the form of a circular thin steel plate are stacked. A hole to which the rotation shaft 100 is coupled may be disposed at the center of the rotor core 210 . The rotor core 210 may include a plurality of pockets 211 . The pocket portion 211 is formed to penetrate through the rotor core 210 in the height direction of the rotor core 210 . In the motor, the height direction of the rotor core 210 is parallel to the axial direction of the rotation shaft 100 . A magnet 220 is inserted into the pocket portion 211 . The number of pocket portions 211 is the same as the number of magnets 220 . The plurality of pockets 211 are arranged at regular intervals in the circumferential direction of the rotor core 210 . The planar shape of the pocket portion 211 may be a rectangle.

The pocket portion 211 may include an inner surface 211a and an outer surface 211b. The inner surface 211a and the outer surface 211b are disposed to face each other. Both the inner surface 211a and the outer surface 211b are portions in contact with the magnet 220 . Both sides 211c of the pocket portion 211 are partially in contact with the magnet 220 . In addition, voids 211d may be disposed on both side surfaces 211c of the pocket portion 211 . The air gap 211d is a portion spaced apart from the magnet 220 . The air gap 211d is for preventing magnetic flux from leaking to the adjacent magnet 220 . Meanwhile, a bridge portion 212 is disposed between the adjacent pocket portion 211 and the pocket portion 211 . The bridge part 212 is disposed between the side surface 211c and the air gap 211d of the adjacent pocket part 211 .

3 is a view illustrating a through hole disposed in a bridge portion of a rotor core.

2 and 3 , a through hole 213 may be disposed in the bridge part 212 of the rotor core 210 . The through hole 213 is formed through the upper and lower surfaces of the rotor core 210 in the axial direction of the rotation shaft 100 . The through hole 213 may be disposed closer to the center C of the rotor core 210 than the air gap 211d. The through hole 213 may be disposed for each of the plurality of bridge parts 212 . The plurality of through holes 213 may be disposed at regular intervals along the circumferential direction of the rotor core 210 .

4 is a view showing a through hole in a side cross-sectional view of the rotor core.

Referring to FIG. 4 , a magnet 220 is disposed inside the pocket portion 211 . A through hole 213 is disposed in the bridge portion 212 adjacent to the pocket portion 211 . The through hole 213 may include a first hole 213a, a second hole 213b, and a third hole 213c. The first hole 213a, the second hole 213b, and the third hole 213c communicate in the height direction of the rotor core 210 . The second hole 213b is disposed above the first hole 213a. The third hole 213c is disposed below the first hole 213a. The second hole 213b is connected to the upper surface of the rotor core 210 . The third hole 213c is connected to the lower surface of the rotor core 210 . For example, among the plurality of plates constituting the rotor core 210 , the second hole 213b may be formed in n (eg, n is 3) plates continuously stacked downward from the plate disposed on the uppermost layer. can And, among the plurality of plates constituting the rotor core 210 , the third hole 213c may be formed in M plates (eg, M is 3) sequentially stacked upward from the plate disposed in the lowest layer.

Meanwhile, the size of the second hole 213b and the size of the third hole 213c are larger than those of the first hole 213a. For example, when the through hole 213 has a circular shape, the diameter D2 of the second hole 213b and the diameter D3 of the third hole 213c are greater than the diameter D1 of the first hole 213a. Big.

5 is a view illustrating a process of forming a second hole and a third hole of a through hole.

Referring to FIG. 5 , in a state in which the first hole 213a is formed, the second hole 213b and the third hole 213c are formed through the jig J.

5A shows a state in which the first hole 213a is formed in the rotor core 210 . As shown in (b) of FIG. 5 , the jig J is inserted into the upper end and lower end of the first hole 213a, respectively. Since the cross section of the jig J is larger than the first hole 213a, the first hole 213a is deformed and expanded in the plate of the rotor core 210 into which the jig J is inserted. As shown in FIG. 5C , when the jig J is removed, a second hole 213b is formed on the upper side of the first hole 213a, and a third hole is formed on the lower side of the first hole 213a. (213c) is formed.

6 is a view showing a state in which the magnet is fixed in the process of forming the second hole, and FIG. 7 is a view showing the state in which the magnet is fixed in the process of forming the third hole.

Referring to FIG. 6 , when the jig J is inserted into the through hole 213 and the second hole 213b is formed, the jig J is pushed into the through hole 213 , the jig J ) through which the plate of the rotor core 210 passes is deformed, and is caulked by pressing the upper portion of the magnet 220 disposed in the pocket portion 211 in the direction A of FIG. 6 .

Referring to FIG. 7 , when the jig J is inserted into the through hole 213 and the third hole 213c is formed, when the jig J is pushed into the through hole 213 , the jig J ) through which the plate of the rotor core 210 passes is deformed, and is caulked by pressing the lower portion of the magnet 220 disposed in the pocket portion 211 in the direction A of FIG. 7 .

Accordingly, in a state in which the magnet 220 is disposed in the pocket portion 211 , the upper and lower portions of the magnet 220 are caulked, respectively, and fixed to the pocket portion 211 . Therefore, it is possible to fix the magnet 220 to the pocket portion 211 without a separate adhesive. In addition, since the upper end of the magnet 220 is caulked while the lower end of the magnet 220 is caulked in a state in which the magnet 220 is disposed in the pocket portion 211, the magnet 220 in the height direction of the rotor core 210 moves to the pocket portion ( 211) can be prevented.

8 is a plan view of the rotor showing a state in which the magnet is fixed to the pocket portion through the through hole, and FIG. 9 is a plan view of the rotor showing the position of the through hole.

8 and 9, in the process of forming the through-hole 213, by pressing and deforming the edge of the pocket portion 211 as shown in A of FIG. 8, the magnet 220 in the pocket portion 211 is Fix it. For example, when the through-hole 213 is formed, the inner surface 211a of the pocket portion 211 and the side surface 211c of the pocket portion 211 in contact with the inner surface 211a of the pocket portion 211 extend inside the pocket portion 211 . While being deformed, the magnet 220 is pressed.

Referring to FIG. 9 , the bridge part 212 may be disposed in the center between the pocket part 211A and the pocket part 211B. When L in FIG. 9 is a reference line indicating the center of the width of the bridge part 212 , the through hole 213 may be disposed closer to either side of the pocket part 211A or the pocket part 211B. For example, as shown in FIG. 9 , the through hole 213 may be disposed closer to the pocket part 211A disposed on the other side than the pocket part 211B disposed on one side with respect to the reference line L. . In the case of such a through-hole 213, by pushing the magnet 220 in the counterclockwise direction (P) as shown in P of FIG. ) may align the positions of the plurality of magnets 220 disposed in the . As a result, it is possible to ensure the balance of the motor, there is an advantage that can reduce the vibration and noise caused by the unbalance of the motor.

Such an effect may also be achieved through the asymmetric shape of the through hole 213 .

10 is a view illustrating a through-hole having an asymmetric shape.

Referring to FIG. 10 , even in a state in which the through-hole 213 is disposed at the center of the width of the bridge part 212 , it is possible to secure a certain directionality for pressing the magnet 220 through the asymmetric shape. For example, as shown in FIG. 10 , with respect to the reference line L, the first hole 213a has a symmetrical shape, but the second hole 213b and the third hole 213c are at the reference line L. It may be implemented to have an asymmetric shape further extended to either side. Alternatively, the first hole 213a may be circular, but the second hole 213b and the third hole 213c may be non-circular. These through-holes 213 are formed by adhering the magnet 220 to the opposite side of the pocket portion 211 in a clockwise or counterclockwise direction with respect to the center of the rotor core 210 , thereby forming a plurality of pieces disposed in the rotor core 210 . The positions of the magnets 220 may be aligned.

11 is a view illustrating a detailed position of a through hole.

Referring to FIG. 11 , the through hole 213 may be disposed in the bridge part 212 . Specifically, it may be disposed between the first circle O1 and the second circle O2 based on the radial direction of the rotor core 210 .

The first circle O1 is a circle in which the radius R1 is the distance from the center C of the rotor core 210 to the width center P1 of the inner surface 211a of the pocket part 211, and the second circle ( O2) is a circle in which the distance from the center C of the rotor core 210 to the center P2 of the width of the outer surface 211b of the pocket portion 211 is the radius R2.

12 is a view showing a pocket portion including a curved surface at the corner.

Referring to FIG. 12 , the pocket portion 211 may include a curved portion 211e. The curved portion 211e may be disposed at a corner disposed at the boundary between the inner surface 211a and the side surface 211c of the pocket portion 211 . The curved portion 211e may be implemented in a convex shape toward the inner space of the pocket portion 211 . The curved portion 211e of the pocket portion 211A disposed on one side with respect to the bridge portion 212 and the curved portion 211e of the pocket portion 211B disposed on the other side with respect to the bridge portion 212 are the reference lines. It may be arranged symmetrically with respect to (L). In this case, the through hole 213 may be disposed at the center of the width of the bridge part 212 . When the through hole 213 is formed, the curved portion 211e of the pocket portion 211A on one side and the curved portion 211e of the pocket portion 211B on the other side are expanded and deformed, and the pocket portion 211A on the one side is formed. The disposed magnet 220 and the magnet 220 of the pocket portion 211B disposed on the other side are pressed, respectively. When the through-hole 213 is formed, the curved portion 211e has an advantage in that the direction of the portion to be expanded and deformed is varied, so that the magnet 220 can be effectively pressed and fixed. Meanwhile, the radius of curvature of the curved portion 211e may be the same as the radius of curvature of the through hole 213 .

As described above, the motor according to one preferred embodiment of the present invention has been described in detail with reference to the accompanying drawings.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes and substitutions are possible within the scope that does not depart from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings. . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: rotation axis
200: rotor
210: rotor core
211: pocket portion
212: bridge part
213: through hole
220: magnet
300: stator

Claims (11)

axis of rotation;
a rotor including a hole in which the rotation shaft is disposed; and
It includes a stator disposed on the outside of the rotor,
The rotor includes a rotor core surrounding the rotating shaft,
It includes a magnet disposed inside the rotor core,
The rotor core includes a pocket portion on which the magnet is disposed, and a bridge portion disposed between the pocket portion and the pocket portion in a circumferential direction of the rotor core,
The bridge part includes a through hole penetrating the upper and lower surfaces of the rotor core,
The through hole includes a first hole communicating with each other, a second hole and a third hole,
The second hole is disposed on the upper side of the first hole and is connected to the upper surface of the rotor core,
The third hole is disposed below the first hole and is connected to a lower surface of the rotor core,
The size of the second hole and the size of the third hole are larger than the size of the first hole,
The first hole has a symmetrical shape, and the second hole and the third hole have an asymmetrical shape. The method of claim 1,
The pocket portion is disposed on a side surface of the pocket portion, the motor including a gap portion spaced apart from the magnet. 3. The method of claim 2,
In the radial direction of the rotor core, the through hole is disposed inside the air gap portion. The method of claim 1,
The through-hole is disposed between the adjacent pockets, and the through-hole is disposed close to any one of the adjacent pockets in the circumferential direction of the rotor core. The method of claim 1,
The number of the through-holes is the same as the number of the magnets. The method of claim 1,
The circular shape of the through hole,
A diameter of the second hole and a diameter of the third hole are larger than a diameter of the first hole. delete The method of claim 1,
The first hole is circular, and the second hole and the third hole are non-circular. delete The method of claim 1,
A circle whose radius is the distance from the center of the rotor core to the center of the width of the inner surface of the pocket is referred to as a first circle,
When a circle having a radius from the center of the rotor core to the center of the width of the outer surface of the pocket part is a second circle,
The through hole is disposed between the first circle and the second circle with respect to the radial direction of the rotor core. The method of claim 1,
The pocket portion has an edge disposed at the boundary between the inner surface and the side surface of the motor including a curved surface convex toward the inside of the pocket portion.

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