KR102626959B1 - Rotor assembly and motor including the same - Google Patents

Abstract

A motor according to an embodiment of the present invention includes a stator; a rotor assembly installed to rotate inside the stator; and a rotating shaft inserted into the rotor assembly, wherein the rotor assembly includes: a rotor core provided with a magnet; A bridge inserted inside the rotor core; A first support plate coupled to one surface of the rotor core; and a second support plate coupled to the other surface of the rotor core, wherein the bridge, the first support plate, and the second support plate are fastened together by a fastening member.

Description

ROTOR ASSEMBLY AND MOTOR INCLUDING THE SAME}

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

In general, a motor refers to a device that obtains rotational power by converting electrical energy into mechanical energy. These motors are divided into alternating current motors and direct current motors depending on the type of power applied. Among them, induction motors are a type of alternating current motor and are widely used to drive home appliances such as air conditioners and refrigerators.

An induction motor consists of a stator (hereinafter referred to as stator) and a rotor (hereinafter referred to as rotor), and a rotating torque is applied to the rotor by the rotating magnetic field generated when current flows in the winding coil of the stator. It operates on the principle of generating torque, and the rotational force of the rotor due to the rotational torque is used as rotational power.

In addition, the induction motor may further include a rotation shaft that is press-fitted into the center of the rotor rotating inside the stator and transmits the rotational force to a predetermined device as the rotor rotates.

In relation to the above-mentioned motor, the prior document Japanese Patent Application Laid-Open No. 2016-195521 (published date: November 17, 2016) discloses a technology regarding a stacked rotor and a method of manufacturing the same.

The laminated rotor disclosed in the prior literature includes a laminated steel sheet (electrical steel sheet) on which a magnet hole is formed, and a magnet body inserted into the magnet hole. In particular, the stacked rotor further includes bridge parts made of non-magnetic material to reduce magnetic flux leakage of the rotor that occurs during motor operation.

Specifically, a magnetic flux leakage suppression hole is formed in the laminated steel sheet to suppress magnetic flux leakage, and a bridge component made of a non-magnetic material may be inserted into the magnetic flux leakage suppression hole. At this time, the bridge component may be press-fitted into the laminated steel plate and then fixed to the inside of the laminated steel plate using molten resin. Accordingly, the bridge component is stably supported on the inside of the laminated steel plate, so magnetic flux leakage can be suppressed.

However, the stacked rotor disclosed in the prior literature has the following problems.

First, as non-magnetic bridge parts are press-fitted into the laminated steel sheet, slight deformation may occur in the laminated steel sheet. When deformation occurs in the laminated steel sheet, it affects the electromagnetic field characteristics, resulting in great difficulty in controlling the frequency of the motor.

Second, in order to fix bridge parts to laminated steel plates, a separate process of filling molten resin is required, and filling defects may occur during this process, which causes a significant increase in mass production costs.

Third, in the process of fixing the bridge component to the laminated steel plate, the mechanical properties of the molten resin change due to high temperature, which can have a significant negative impact on the reliability of the motor.

Japanese Patent Laid-Open No. 2016-195521 (Published Date: November 17, 2016)

The present invention was proposed to improve the above problems, and the object of the present invention is to provide a rotor assembly that simplifies the assembly process and improves product reliability by assembling bridge parts without using the conventional press-fitting method, and the same. The purpose is to provide a motor including.

Another object of the present invention is to provide a rotor assembly in which leakage magnetic flux due to rotation of the rotor can be significantly reduced and a motor including the same.

Another object of the present invention is to provide a rotor assembly and a motor including the same that can prevent the magnet inserted into the rotor from being damaged or falling out even if the motor rotates at high speed.

Another object of the present invention is to provide a rotor assembly that can significantly improve the strength and fastening force of the bridge and a motor including the same.

A motor according to an embodiment of the present invention for achieving the above object includes a stator, a rotor assembly installed to rotate inside the stator, and a rotation shaft inserted into the rotor assembly.

The rotor assembly includes a rotor core provided with a magnet, a bridge inserted inside the rotor core, a first support plate coupled to one side of the rotor core, and a second support coupled to the other side of the rotor core. Includes plate.

At this time, the bridge, the first support plate, and the second support plate are fastened together by a fastening member, so there is an advantage that the rotor assembly can be easily assembled without a press-fitting process.

The rotor core is made up of a plurality of core blocks radially connected, and in each core block, a plurality of magnets may be arranged symmetrically with respect to one bridge. At this time, since the bridge is formed of a magnetic material, loss due to leakage magnetic flux of the rotor due to rotation can be greatly reduced.

Additionally, the rotor core is formed in a cylindrical shape, and a plurality of bridges may be spaced apart from each other along the circumferential direction of the rotor core inside the rotor core. Additionally, the axial length (L) of the bridge may be formed to be equal to the axial length of the rotor core.

At this time, the axial front surface of the rotor core is in contact with the first support plate, and the axial rear surface of the rotor core is in contact with the second support plate, so that even if the motor rotates at high speed, the first support plate and the second support plate 2 The support plate can prevent the magnets inserted into the rotor core from being damaged or falling out.

The bridge is formed in a plate shape and may include a body portion inserted in the axial direction of the rotor core, and a first fastening portion formed at one end of the body portion and fastened by a first fastening member.

At this time, the first support plate, the first fastening part, and the second support plate may be penetrated and fastened by the first fastening member.

The bridge includes a plurality of extensions extending from the body to both sides, and the plurality of extensions are arranged spaced apart in the width direction of the body, so the strength of the bridge is improved and damage to the bridge is reduced, thereby increasing product lifespan. There is.

In addition, the bridge extends from the body portion to both sides and may further include an extension portion formed with a second fastening portion fastened by a second fastening member.

Specifically, the plurality of extension parts include a first extension part extending from the other end of the body to both sides and a second fastening part extending to both sides at a predetermined distance from the first extension part and fastened by a second fastening member. It may include a second extension portion formed in the second part.

The rotor core penetrates from the front to the back in the axial direction of the rotor core and includes a bridge insertion hole into which the bridge is inserted. And the rotor core penetrates from the front to the back in the axial direction of the rotor core, and further includes a magnet insertion hole into which the magnet is inserted.

At this time, the bridge insertion hole and the magnet insertion hole may be connected to each other.

Specifically, the magnet insertion hole has a circular arc shape and includes a plurality of holes spaced apart in the radial direction, and the bridge insertion hole can connect the plurality of holes to each other.

The rotor assembly and the motor including the rotor assembly according to the embodiment of the present invention configured as described above have the following effects.

First, since the rotor core, bridge, first support plate, and second support plate that make up the rotor assembly are fastened by a fastening member, there is an advantage that the rotor assembly can be easily assembled without a press-fitting process.

In particular, according to the present invention, the press-fitting process for fixing the bridge parts that suppress the leakage magnetic flux of the rotor is omitted, so there is no risk of deformation in the electrical steel sheet, and mechanical deformation due to molten resin does not occur at high temperatures. . In other words, there is an advantage that the reliability of the motor is improved and the mass production cost is significantly reduced compared to the prior art.

Second, in each core block forming the rotor core, a plurality of magnets are arranged symmetrically with respect to one bridge, which has the advantage of greatly reducing loss due to leakage magnetic flux of the rotor due to rotation.

Third, the first support plate that shields the front of the rotor core and the second support plate that shields the rear are strongly fastened by screw fastening, so even if the motor rotates at high speed, the rotor is maintained by the first and second support plates. This has the advantage of preventing the magnets inserted into the core from being damaged or falling out.

Fourth, since the bridge has a plurality of extension parts extending from the body to both sides and spaced apart in the width direction of the body, the strength of the bridge is improved and damage to the bridge is reduced, thereby increasing product lifespan.

Fifth, a first fastening part fastened by a first fastening member is formed at one end of the bridge, and a second fastening part fastened by a second fastening member is formed at the other end, so that the bridge is fastened by a plurality of fastening members. Since both sides are fixed, there is an advantage that the fixation power of the bridge is greatly improved.

1 is a cross-sectional view showing a motor according to an embodiment of the present invention.
Figure 2 is a cross-sectional view showing a stator and rotor assembly according to an embodiment of the present invention.
Figure 3 is a perspective view showing a stator according to an embodiment of the present invention.
Figure 4 is a perspective view showing a rotor assembly according to an embodiment of the present invention.
Figure 5 is an exploded perspective view of a rotor assembly according to an embodiment of the present invention.
Figure 6 is a cross-sectional view taken along line II-II' of Figure 4.
Figure 7 is a perspective view showing a bridge according to an embodiment of the present invention.
Figure 8 is a diagram showing the cross-sectional shape of a rotor core according to an embodiment of the present invention.
Figure 9 is a view showing a magnet and a bridge inserted into the rotor core according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference numerals to components in the drawings, it should be noted that the same components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing embodiments of the present invention, if detailed descriptions of related known configurations or functions are judged to impede understanding of the embodiments of the present invention, the detailed descriptions will be omitted.

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 the nature, sequence, or order of the component is not limited by the term. When a component is described as being "connected," "coupled," or "connected" to another component, that component may be directly connected or connected to that other component, but there is no need for another component between each component. It should be understood that may be “connected,” “combined,” or “connected.”

The motor described below can be used to drive home appliances such as air conditioners and refrigerators. Alternatively, the motor may be applied to various devices that require driving force, such as compressors or automobiles.

Hereinafter, a motor according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing a motor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a stator and rotor assembly according to an embodiment of the present invention, and FIG. 3 is a perspective view showing a stator according to an embodiment of the present invention. .

1 to 3, the motor 10 according to an embodiment of the present invention may include a housing 100, a stator 200, a rotor assembly 300, and a rotation shaft 400.

The housing 100 is formed in a cylindrical shape to provide a space inside where the stator 200 and the rotor assembly 300 can be mounted.

At this time, the shape or material of the housing 100 may be modified in various ways. The housing 100 may be made of a metal material that can withstand high temperatures.

The housing 100 may include an upper housing 120 and a lower housing 110. And, the stator 200 and the rotor assembly 300 are configured to be shielded from the outside by combining the upper housing 120 and the lower housing 110.

The stator 200 is fixedly coupled to the inner peripheral surface of the housing 100, and a space 201 is formed therein. And a rotor assembly 300, which will be described later, may be placed in the space 201.

Specifically, the stator 200 generates magnetic force by the applied power, and the rotor assembly 300 generates induced electromotive force through interaction with the stator 200.

The stator 200 is disposed outside the rotor assembly 300. And the stator 200 may be arranged to surround the outer circumference of the rotor assembly 300.

The stator 200 may include a coil and a plurality of cores around which the coil is wound, and may be formed by stacking stator plates having the same shape at a predetermined height.

For example, the stator 200 may include a stator body 210 having a hollow cylindrical shape, and a coil winding portion 220 protruding inward from the inner peripheral surface of the stator body 210.

The stator body 210 may be fixed and supported on the inside of the housing 100. A plurality of the coil winding units 220 are provided, and the plurality of coil winding units 220 may be arranged to be spaced apart from each other.

A coil is wound around each of the plurality of coil winding units 220, and at least a portion of the coil may be disposed between one coil winding unit 220 and the other coil winding unit 220.

In detail, the coil winding unit 220 includes a body 221 protruding from the inner peripheral surface of the stator body 210 toward the center, and an extension part 223 extending from the end of the body 221 to both sides. do.

The extension portion 223 may extend in the direction of two neighboring coil winding portions 220, respectively. That is, two extension parts 223 extending to the left and right, respectively, may be formed in one coil winding part 220. The extension portion 223 may function as a separation prevention rib that prevents the coil wound around the coil winding portion 220 from being separated.

The rotor assembly 300 is inserted into the space 201 provided inside the stator 200 and is coupled to the outer peripheral surface of the rotation shaft 400.

The rotor assembly 300 is provided with a magnetic magnet (see 350 in FIG. 9) and can be rotated through interaction with the stator 200.

The rotor assembly 300 may be formed by stacking a plurality of disk-shaped core plates.

At this time, a plurality of magnets 350 mounted on the rotor assembly 300 may be placed at a point adjacent to the stator 200. The plurality of magnets 350 may be inserted and coupled to each other through holes formed inside the rotor assembly 300.

The rotation shaft 400 is formed through the central portion of the rotor assembly 300.

The rotation shaft 400 may be coupled to the rotor assembly 300 and rotate together with the rotation of the rotor assembly 300. That is, when a driving current is applied to the stator 200, the rotor assembly 300 rotates due to electromagnetic interaction between the stator 200 and the rotor assembly 300, and accordingly, the rotation shaft 400 It rotates in conjunction with the rotation of the rotor assembly 300.

Hereinafter, the rotor assembly according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 4 is a perspective view showing a rotor assembly according to an embodiment of the present invention, FIG. 5 is an exploded perspective view of the rotor assembly according to an embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along line II-II' of FIG. 4. .

Referring to FIGS. 4 to 6, the rotor assembly 300 includes a rotor core 310 provided with a magnet (see 350 in FIG. 9) and a first support plate disposed on one side of the rotor core 310 ( 320), a second support plate 330 disposed on the other side of the rotor core 310, and a bridge 340 inserted into the rotor core 310.

The rotor core 310 may have a cylindrical shape.

A shaft insertion hole 301 into which the rotation shaft 400 is inserted may be formed at the center of the rotor core 310. The shaft insertion hole 301 may be formed by penetrating long in the axial direction from the center of the rotor core 310. Therefore, the rotating shaft 400 can be fixed to the inside of the shaft insertion hole 301 by press-fitting.

Additionally, a magnet insertion hole 370 for inserting a magnet 350 is formed in the rotor core 310. The magnet insertion hole 370 may function to guide magnetic flux toward the magnet 350.

The magnet insertion hole 370 is formed to penetrate the rotor core 310 from the front to the back. That is, the magnet insertion hole 370 may be formed by penetrating long in the axial direction from the inside of the rotor core 310.

A plurality of magnet insertion holes 370 may be arranged. For example, the plurality of magnet insertion holes 370 may be arranged to be spaced apart in the circumferential direction of the rotor core 310.

Additionally, a bridge insertion hole 360 is formed in the rotor core 310 into which a bridge 340, which will be described later, is inserted.

The bridge insertion hole 360 is formed to penetrate the rotor core 310 from the front to the back. That is, the bridge insertion hole 360 may be formed by penetrating long in the axial direction from the inside of the rotor core 310.

A plurality of bridge insertion holes 360 may be arranged. For example, the plurality of bridge insertion holes 360 may be arranged to be spaced apart in the circumferential direction of the rotor core 310.

At this time, the bridge insertion hole 360 is connected to the magnet insertion hole 370.

And the bridge insertion hole 360 may be formed to penetrate at least a portion of the magnet insertion hole 370. That is, at least a portion of the bridge insertion hole 360 and the magnet insertion hole 370 may overlap and be connected to each other.

Meanwhile, the rotor core 310 may be formed by connecting a plurality of core blocks 310a radially. For example, the rotor core 310 may have a cylindrical shape with eight core blocks arranged continuously in the circumferential direction.

Additionally, the core block 310a may be formed by stacking a plurality of core plates in the axial direction. That is, both the magnet insertion hole 370 and the bridge insertion hole 360 may be formed in the core plate.

In this embodiment, it will be explained that the rotor core 310 is composed of eight core blocks 310a. However, it is not limited to this, and of course, the rotor core 310 may be made of any number of core blocks.

Define direction.

“Axis direction” can be understood as the direction of the central axis of the rotor assembly 300, that is, the direction in which the rotation axis 400 extends.

And based on FIG. 6, among the “axial directions,” the direction toward the left is defined as the “frontward direction,” and the opposite direction is defined as the “rearward direction.”

On the other hand, the “radial direction” refers to the radial direction of the rotor assembly 300 and may be defined as a direction perpendicular to the direction in which the rotation axis 400 extends.

The first support plate 320 is disposed in front of the rotor core 310.

The first support plate 320 may be formed in a disk shape and coupled to the front of the rotor core 310.

Additionally, a shaft passage hole 321 through which the rotation shaft 400 passes may be formed in the center of the first support plate 320.

At this time, the shaft passage hole 321 is disposed to face the shaft insertion hole 301 of the rotor core 310, so that the rotation shaft 400 can be guided into the inside of the rotor core 310. .

In addition, the first support plate 320 functions to shield the front surface of the rotor core 310 and protect the magnet 350 inserted into the rotor core 310.

That is, even if the rotor rotates at high speed, the first support plate 320 can prevent the magnet 350 inserted inside the rotor core 310 from being damaged or falling out.

Additionally, the first support plate 320 is made of a metal material and can be tightly coupled to the front surface of the rotor core 310.

At this time, the first support plate 320 may be fastened to the rotor core 310 by a plurality of fastening members 381 and 382.

That is, a plurality of fastening holes 322 and 323 may be formed in the first support plate 320 for fastening a plurality of fastening members 381 and 382, respectively. A plurality of fastening holes 322 and 323 may be arranged to be spaced apart in the circumferential direction of the first support plate 320.

Specifically, the plurality of fastening holes 322 and 323 include a first fastening hole 322 spaced apart in the circumferential direction along the outer edge of the first support plate 320, and an inner side of the first support plate 320. It may include second fastening holes 323 spaced apart in the circumferential direction along the edge.

The second support plate 330 is disposed behind the rotor core 310.

The second support plate 330 may be formed in a disk shape and coupled to the rear of the rotor core 310.

Additionally, a shaft passage hole 331 through which the rotation shaft 400 passes may be formed in the center of the second support plate 330.

At this time, the shaft passage hole 331 is disposed to face the shaft insertion hole 301 of the rotor core 310, so that the rotation shaft 400 can be guided into the inside of the rotor core 310. .

Additionally, the second support plate 330 functions to shield the rear of the rotor core 310 and protect the magnet 350 inserted into the rotor core 310.

That is, even if the rotor rotates at high speed, the magnet 350 inserted inside the rotor core 310 can be prevented from being damaged or falling out by the second support plate 330.

Additionally, the second support plate 330 is made of a metal material and can be coupled to the rear of the rotor core 310 in close contact.

At this time, the second support plate 330 may be fastened together to the rotor core 310 by a plurality of fastening members 381 and 382.

That is, a plurality of fastening holes 332 and 333 may be formed in the second support plate 330 for fastening a plurality of fastening members 381 and 382, respectively. A plurality of fastening holes 332 and 333 may be arranged to be spaced apart in the circumferential direction of the second support plate 330.

Specifically, the plurality of fastening holes 332 and 333 include a first fastening hole 332 spaced apart in the circumferential direction along the outer edge of the second support plate 330, and an inner side of the second support plate 330. It may include second fastening holes 333 spaced apart in the circumferential direction along the edge.

In summary, the plurality of fastening members 381 and 382 may sequentially pass through and fasten the first support plate 320, the rotor core 310, and the second support plate 330.

At this time, the fastening members 381 and 382 may be formed in a bolt shape and may be fixed by a nut (not shown) provided on the front of the first support plate 320 or the rear of the second support plate 330. You can.

By this configuration, the coupling force between the rotor core 310 and the first and second support plates 320 and 330 can be improved, and the overall strength of the rotor assembly 300 can be improved.

Hereinafter, a bridge according to an embodiment of the present invention will be described in detail with reference to the drawings.

Figure 7 is a perspective view showing a bridge according to an embodiment of the present invention.

Referring to FIGS. 6 and 7 together, the bridge 340 is a component inserted inside the rotor core 310 to reduce magnetic flux leakage of the rotor during operation of the motor. For this purpose, the bridge 340 may be formed of a non-magnetic material.

For example, the bridge 340 may be made of metal, preferably stainless steel.

Additionally, the bridge 340 may be inserted inside the rotor core 310 and may function to fix the magnet 350 inserted into the rotor core 310.

Specifically, the bridge 340 includes a body portion 341 having a predetermined area, a first fastening portion 342 formed at an end of the body portion 341, and extending on both sides from the body portion 341. It may include an extension part 343.

The body portion 341 may have a square plate shape extending long in the axial direction. For example, the body portion 341 may be formed to have a width (W) in the radial direction of the rotor core 310 and a length (L) in the axial direction of the rotor core 310. there is.

At this time, the axial length (L) of the body portion 341 may be formed to be equal to the axial length of the rotor core 310.

That is, when the bridge 340 is completely inserted into the bridge insertion hole 360 of the rotor core 310, the front end of the bridge 340 and the front end of the rotor core 310 are on the same plane (P1). It can be located in . Additionally, the rear end of the bridge 340 and the rear end of the rotor core 310 may be located on the same plane (P2).

And when the bridge 340 is inserted into the rotor core 310, the first support plate 320 is tightly coupled to the front surface of the rotor core 310, and the second support plate 330 may be coupled in close contact with the rear of the rotor core 310.

Accordingly, the front and rear ends of the bridge 340 can be brought into close contact with the first support plate 320 and the second support plate 330, which has the advantage of facilitating coupling between parts and improving fastening force. there is.

The first fastening part 342 is a part that is penetrated and inserted by the first fastening member 381. The first fastening part 342 is formed at one end of the body part 341.

Specifically, the first fastening part 342 may be formed to extend in a circular shape from one end of the body part 341. And a first fastening hole 342a through which the first fastening member 381 passes may be formed in the first fastening part 342.

That is, the first fastening member 381 may be fastened through the first fastening hole 342a of the bridge 340 inserted into the rotor core 310.

At this time, the first fastening portion 342 may be arranged to be spaced apart in the circumferential direction along the outer edge of the rotor core 310.

The extension portion 343 is a portion extending from the body portion 341 to both sides. The extension portion 343 may include multiple extension portions. At this time, a plurality of extension parts may be arranged to be spaced apart in the width direction of the body portion 341.

The plurality of extension parts may each extend vertically from the body portion 341 in the thickness direction of the body portion 341 . At this time, the part extending in one direction of each extension and the part extending in the other direction may have shapes that are symmetrical to each other. That is, with respect to the body portion 341, each extension portion may be formed in a shape that is left and right symmetrical.

Specifically, the plurality of extension parts 343 may include a first extension part 343a, a second extension part 343b, a third extension part 343c, and a fourth extension part 343d.

The first extension part 343a, the second extension part 343b, the third extension part 343c, and the fourth extension part 343d may be arranged to be spaced apart in the width direction in the body part 341. .

And, the first extension part 343a, the second extension part 343b, the third extension part 343c, and the fourth extension part 343d are arranged to be sequentially spaced apart from the other end of the body part 341. It can be.

Here, the extension length or protrusion length of each of the extension parts is designed to be different from each other. Specifically, among the plurality of extension parts, the distance between one end and the other end of the second extension part 343b, that is, the width W2 of the second extension part 343b, may be formed to be the largest. And among the plurality of extension parts, the distance between one end and the other end of the third extension part 343c, that is, the width W3 of the third extension part 343c, may be formed to be the smallest.

In addition, the width W1 of the first extension part 343a may be smaller than the width W2 of the second extension part 343b and larger than the width W4 of the fourth extension part 343d. You can.

In addition, the width W4 of the fourth extension part 343d may be smaller than the width W1 of the first extension part 343a and larger than the width W3 of the third extension part 343c. You can.

Therefore, by configuring the plurality of extension parts, the strength of the bridge 340 can be improved, and the coupling force between the bridge 340 and the rotor core 310 can be improved.

Meanwhile, a second fastening portion 344 may be formed in the second extension portion 343b.

The second fastening part 344 is a part that is penetrated and inserted by the second fastening member 382. The second fastening portion 344 is formed at both ends of the second extension portion 343b.

Specifically, the second fastening portion 344 may be formed to extend in a circular shape from each end on both sides of the second extension portion 343b. In addition, a second fastening hole 344a through which the second fastening member 382 passes may be formed in the second fastening part 344.

At this time, the second fastening portion 344 may be arranged to be spaced apart in the circumferential direction along the inner edge of the rotor core 310.

That is, the plurality of second fastening members 382 may each be fastened through the second fastening holes 344a of the bridge 340 inserted into the rotor core 310.

FIG. 8 is a diagram showing the cross-sectional shape of a rotor core according to an embodiment of the present invention, and FIG. 9 is a diagram showing a magnet and a bridge inserted into the rotor core according to an embodiment of the present invention.

Referring to FIGS. 7 to 9 together, as described above, the rotor core 310 may be formed by connecting a plurality of core blocks 310a to 310h radially. For example, the rotor core 310 may have a cylindrical shape with eight core blocks arranged continuously in the circumferential direction.

Each core block 310a may include a magnet insertion hole 370 into which the magnet 350 is inserted and a bridge insertion hole 360 into which the bridge 340 is inserted.

The magnet insertion hole 370 is formed by penetrating from the front to the back of the core block 310a. That is, the magnet insertion hole 370 may be formed by penetrating long in the axial direction from the inside of the core block 310a.

A plurality of separated magnets 350 may be inserted into the magnet insertion hole 370. The magnet insertion hole 370 may be made of a plurality of holes having an arc shape.

At this time, the magnet insertion hole 370 can also perform the function of guiding magnetic flux toward the magnet 350. That is, in order to easily guide the magnetic flux toward the magnet 350, the magnet insertion hole 370 may be formed in a concave round shape.

In detail, the magnet insertion hole 370 may include a plurality of holes 371, 372, 373, and 374 that have an arc shape and are spaced apart in the radial direction.

For example, the plurality of holes 371, 372, 373, and 374 may include a first hole 371, a second hole 372, a third hole 373, and a fourth hole 374.

The first to fourth holes 371, 372, 373, and 374 have the same curvature and may be arranged to be spaced apart from each other. And the first to fourth holes 371, 372, 373, and 374 may be arranged sequentially.

At this time, both ends of the first to fourth holes 371, 372, 373, and 374 may be disposed adjacent to the outer edge of the rotor core 310.

However, the arc lengths of the first to fourth holes 371, 372, 373, and 374 may be designed differently. That is, as it moves from the first hole 371 to the fourth hole 374, the length of the arc becomes longer, but its curvature may remain the same.

On the other hand, the first hole 371 may be disposed adjacent to the outer peripheral surface of the core block 310a. And the second hole 372 is located inside the first hole 371 and is arranged to surround the first hole 371, and the third hole 373 is located inside the first hole 372. It is located further inside and may be arranged to surround the second hole 372. Lastly, the fourth hole 374 is located inside the third hole 373 and may be arranged to surround the third hole 373.

That is, among the first to fourth holes 371, 372, 373, and 374, the fourth hole 374 is located at the innermost side, and the first hole 371 is located at the outermost side.

Meanwhile, the bridge insertion hole 360 is formed to penetrate from the front to the back of the core block 310a. That is, the bridge insertion hole 360 may be formed by penetrating long in the axial direction from the inside of the core block 310a.

A portion of the bridge insertion hole 360 is arranged to overlap the magnet insertion hole 370. That is, the bridge insertion hole 360 and the magnet insertion hole 370 may be connected to each other.

The bridge insertion hole 360 is formed to correspond to the shape of the bridge 340 described above.

In detail, the bridge insertion hole 360 includes a body part hole 361 into which the body part 341 of the bridge 340 is inserted, and a first fastening part 342 into which the first fastening part 342 of the bridge 340 is inserted. It may include a fastening part hole 362 and an extension hole 363 into which the extension part 343 of the bridge 340 is inserted.

The body portion hole 361 is formed to correspond to the shape of the body portion 341 of the bridge 340.

In particular, the body hole 361 is formed through the magnet insertion hole 370. That is, the body hole 361 may be disposed to penetrate all of the first to fourth holes 371, 372, 373, and 374. The body hole 361 may be formed in a straight shape.

For example, the body hole 361 may be arranged to pass through each center of the first to fourth holes 371, 372, 373, and 374. Then, when the body portion 341 is inserted into the body hole 361, the internal spaces of the first to fourth holes 371, 372, 373, and 374 may be divided into two spaces.

Additionally, eight separate magnets 350 can be inserted into eight separate spaces formed in the first to fourth holes 371, 372, 373, and 374 partitioned by the body portion 341, respectively.

According to this configuration, the bridge 340 formed of a magnetic material can be interposed between neighboring magnets, and as a result, leakage magnetic flux when the rotor rotates can be greatly reduced.

The first fastener hole 362 may be disposed in an inner area surrounded by the first hole 371. The first fastener hole 362 may be located close to the outer peripheral surface of the core block 310a.

The extension hole 363 is formed to correspond to the shape of the extension part 343 of the bridge 340.

In detail, the extension hole 363 includes a first extension hole 363a into which the first extension part 343a is inserted, and a second extension hole 363b into which the second extension part 343b is inserted. ), a third extension hole 363c into which the third extension part 343c is inserted, and a fourth extension hole 363d into which the fourth extension part 343d is inserted.

At this time, the first extension hole 363a and the second extension hole 363b may be disposed outside the fourth hole 374. And the third extension hole 363c may be disposed between the fourth hole 374 and the third hole 373, and the fourth extension hole 363d may be located between the fourth hole 374 and the third hole 373. 373) and the second hole 372.

That is, when the bridge 340 is inserted into the bridge insertion hole 360, a portion of the extended portion of the bridge 340 may be intervened between a plurality of holes forming the magnet insertion hole 370.

Accordingly, in each core block 310a forming the rotor core 310, a plurality of magnets 350 are arranged symmetrically with respect to one bridge 340, thereby significantly reducing loss due to leakage magnetic flux of the rotor. You can do it.

In addition, the bridge 340 is provided with a plurality of extension parts spaced apart in the radial direction of the rotor core 310, so that the rigidity of the bridge 340 can be improved and the fixing force (fastening force) can be improved.

Claims (20)

A housing forming an internal space;
A stator installed in the inner space of the housing;
a rotor assembly installed to rotate inside the stator; and
It includes a rotation shaft inserted inside the rotor assembly,
The rotor assembly is,
A rotor core formed in a cylindrical shape and equipped with a magnet inside;
A bridge inserted inside the rotor core;
A first support plate coupled to the front of the rotor core and shielding the front of the rotor core; and
It is coupled to the rear of the rotor core and includes a second support plate that shields the rear of the rotor core,
A plurality of fastening holes for fastening a plurality of fastening members are formed in each of the first support plate and the second support plate,
The plurality of fastening holes are,
a plurality of first fastening holes spaced apart in a circumferential direction along outer edges of the first and second support plates;
It includes a plurality of second fastening holes spaced apart in the circumferential direction along the inner edges of the first support plate and the second support plate,
A motor, wherein the bridge, the first support plate, and the second support plate are fastened together by the plurality of fastening members. According to claim 1,
The rotor core is made up of a plurality of core blocks connected radially,
A motor in which multiple magnets are arranged symmetrically with respect to one bridge in each core block. According to claim 1,
A motor in which a plurality of bridges are spaced apart from each other along the circumferential direction of the rotor core inside the rotor core. delete According to claim 1,
A motor in which the axial length (L) of the bridge is formed to be equal to the axial length of the rotor core. According to claim 1,
The bridge is a motor formed of a non-magnetic material. According to claim 1,
The bridge is,
a body portion formed in a plate shape and inserted in the axial direction of the rotor core;
A motor comprising a first fastening portion formed at one end of the body portion and fastened by a first fastening member. According to claim 7,
A motor in which the first support plate, the first fastening part, and the second support plate are penetrated and fastened by the first fastening member. According to claim 7,
The bridge extends from the body portion to both sides and further includes an extension portion formed with a second fastening portion fastened by a second fastening member. According to claim 7,
The bridge further includes a plurality of extension parts extending from the body portion to both sides,
A motor in which the plurality of extension parts are arranged to be spaced apart in the width direction of the body part. According to claim 10,
The plurality of extensions,
a first extension part extending to both sides from the other end of the body part; and
A motor comprising a second extension portion extending from both sides at a predetermined distance from the first extension portion and having a second fastening portion fastened by a second fastening member. According to claim 1,
The rotor core is penetrated from the front to the back of the rotor core in the axial direction and includes a bridge insertion hole into which the bridge is inserted. According to claim 12,
The rotor core penetrates from the front to the back of the rotor core in the axial direction and further includes a magnet insertion hole into which the magnet is inserted. According to claim 13,
A motor in which the bridge insertion hole and the magnet insertion hole are connected to each other. According to claim 14,
The magnet insertion hole has a circular arc shape and includes a plurality of holes spaced apart in the radial direction,
The bridge insertion hole is a motor that connects the plurality of holes to each other. A rotor core formed in a cylindrical shape and equipped with a magnet inside;
A bridge inserted inside the rotor core;
a first support plate coupled to the front of the rotor core and shielding the front of the rotor core; and
It is coupled to the rear of the rotor core and includes a second support plate that shields the rear of the rotor core,
A plurality of fastening holes for fastening a plurality of fastening members are formed in each of the first support plate and the second support plate,
The plurality of fastening holes are,
a plurality of first fastening holes spaced apart in a circumferential direction along outer edges of the first and second support plates;
It includes a plurality of second fastening holes spaced apart in the circumferential direction along the inner edges of the first support plate and the second support plate,
A rotor assembly, wherein the bridge, the first support plate, and the second support plate are fastened together by the plurality of fastening members. According to claim 16,
The rotor core is made up of a plurality of core blocks connected radially,
A rotor assembly in which a plurality of magnets are arranged symmetrically with respect to one bridge in each core block. According to claim 16,
The bridge is a rotor assembly in which a plurality of bridges are spaced apart from each other along the circumferential direction of the rotor core inside the rotor core. delete According to claim 16,
The bridge is,
a body portion formed in a plate shape and inserted in the axial direction of the rotor core;
A rotor assembly including a first fastening portion formed at one end of the body portion and fastened by a first fastening member.

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