KR102026240B1 - Spoke structure and a motor coupled with the spoke structure - Google Patents

Abstract

The present invention relates to a spoke structure that is fastened to a motor, and includes an inner ring, an outer ring positioned outside the inner ring, and a plurality of spokes connecting the inner ring and the outer ring and radially disposed along the circumferential direction. And a spoke structure including a plurality of outer bars connecting the outer surfaces of the spoke surface and the spoke surface and the lower spoke surface, and coupled to the rotor of the motor to reduce the amount of leakage magnetic flux inside the motor.

Description

SPOKE STRUCTURE AND A MOTOR COUPLED WITH THE SPOKE STRUCTURE}

The present invention relates to a motor and spoke structure to which the spoke structure is fastened, and more particularly, to a spoke structure and a motor to which the spoke structure is fastened for improving the output of the motor and increasing rigidity.

PM (Permanent Magnet) motors have high efficiency because they do not need to use a permanent magnet to supply power to the windings instead of the rotor windings, and the operating time is reduced and the maintenance cost is reduced compared to standard motors. There are two types of PM motors: Surface Permanent Magnet (SPM) motors with permanent magnets attached to the rotor surface, and Interior Permanent Magnet motors with permanent magnets embedded inside the rotor. In order to design high-power and high-efficiency motors, the design of increasing the motor speed is progressing. As a result, DC motors, induction motors, or SPM motors are gradually being replaced by IPM motors.

On the other hand, among the PM motors, a spoke type motor in which iron cores and permanent magnets are alternately arranged is a type that can use the most reluctance force, and concentrates the magnetic flux density of the rotor to produce high power. It is characterized by. For example, spoke type motors may be used in devices such as washing machines requiring high torque and high speed operation.

In the design of the spoke type motor, methods for increasing the efficiency of the motor by increasing the magnetic flux density by reducing the leakage magnetic flux have been steadily discussed. For example, changes such as increasing the size of the barrier portion between the permanent magnet and the shaft or designing a thin lip thickness have been applied. Alternatively, a method of increasing the absolute amount of magnetic flux density by using rare earth permanent magnets or increasing the amount of magnets has been used.

However, when the size of the barrier is increased, the amount of magnetic flux delivered to the stator is reduced, and thus the output of the motor is reduced. When the thickness of the lip is changed thinly, the rigidity of the motor is insufficient. In addition, in the case of using a rare earth permanent magnet or increasing the number of magnets, there is a problem in that the cost of the product is increased, which is not suitable for mass production.

Therefore, there is a need for an improved design method of the spoke type motor for increasing the output efficiency of the motor while maintaining the rigidity of the motor even at high speeds.

One object of the present invention is to provide a spoke structure that is fastened to the spoke type motor.

One object of the present invention is to provide a spoke structure is fastened to the spoke-type motor to improve the output of the motor.

One object of the present invention is to provide a spoke type motor to which the structure is fastened.

According to an aspect of the present invention, a stator comprising a stator core having a plurality of slots and a winding wound around the plurality of slots; A rotor having a rotor core having a plurality of insertion holes and a plurality of permanent magnets embedded in each of the plurality of insertion holes, and a shaft located inside the rotor to provide an axis of rotation of the rotor; A spoke structure may be provided coupled to the rotor of the motor to reduce the amount of leakage magnetic flux inside the motor.

The spoke structure may include an inner ring, an outer ring positioned outside the inner ring, and a spoke surface including a plurality of spokes connecting the inner ring and the outer ring and disposed radially along a circumferential direction, and the inner ring and the The outer ring may include a plurality of outer bars disposed side by side in an axial direction of the outer ring to connect the outer rings of the upper spoke surface and the lower spoke surface. The spoke surface may include an upper spoke surface and a lower spoke surface.

The spoke structure may be fastened to the motor such that the plurality of outer bars contact the stator side surfaces of the plurality of permanent magnets. In this case, the spoke structure may be provided with the non-magnetic material of the plurality of outer bars to reduce the leakage of the magnetic flux generated by the permanent magnet.

According to another aspect of the invention, a buried permanent magnet type motor, comprising a stator core having a plurality of slots and a stator including a winding wound around the plurality of slots, a rotor core having a plurality of insertion holes and the plurality of A rotor having a plurality of permanent magnets embedded in each of the insertion holes, a shaft located inside the rotor to provide an axis of rotation of the rotor, and coupled to the rotor to reduce the amount of leakage magnetic flux inside the motor A motor including a spoke structure can be provided. The spoke structure coupled to the rotor includes an inner ring, an outer ring positioned outside the inner ring, and a spoke that connects the inner ring and the outer ring and is disposed radially along a circumferential direction. It may include a plurality of outer bars disposed in parallel with the larger surface and in the axial direction of the inner ring and the outer ring to connect the outer rings of the upper spoke surface and the lower spoke surface. The spoke surface may include an upper spoke surface and a lower spoke surface.

The spoke structure coupled to the rotor may be fastened to the motor such that the plurality of outer bars contact the stator side surfaces of the plurality of permanent magnets. The spoke structure coupled to the rotor may be at least partially provided with a nonmagnetic material to reduce leakage of magnetic flux generated by the permanent magnet.

Means for solving the problems of the present invention are not limited to the above-described solutions, and the solutions not mentioned will be clearly understood by those skilled in the art from the present specification and the accompanying drawings. Could be.

According to the present invention, the output efficiency of the spoke type motor can be improved.

According to the present invention, the rigidity of the spoke type motor can be increased.

The effects of the present invention are not limited to the above-described effects, and effects that are not mentioned will be clearly understood by those skilled in the art from the present specification and the accompanying drawings.

1 briefly illustrates a cross section of an example of the motor 100 described herein.
2 is a plan view (a) and a perspective view (b) of the spoke structure 200 according to an embodiment of the present invention.
3 illustrates the outer bar 230 according to an embodiment of the present invention.
4 illustrates a plan view (a) and a perspective view (b) of the spoke structure 200.
5 illustrates the inner support member 270 according to an embodiment of the present invention.
6 illustrates a perspective view (a) and a side view (b) of the spoke structure 200 and the motor 100 to which the spoke structure 200 is coupled according to an embodiment of the present invention.
7 illustrates a cross section of the spoke structure and the motor 100 coupled to the spoke structure according to an embodiment of the present invention.
FIG. 8 shows the result of the electromagnetic field analysis of the spoke type motor a and the spoke type motor b to which the nonmagnetic structure is fastened according to the related art.
9 shows a graph for comparing the torque output of the spoke type motor A and the spoke type motor B to which the nonmagnetic structure is fastened according to the conventional method.
10 shows a graph for comparing torque output of the spoke type motor according to the conventional method and the spoke type motor to which the inner support member according to the present invention is applied.

Since the embodiments described herein are intended to clearly explain the spirit of the present invention to those skilled in the art, the present invention is not limited to the embodiments described herein, and the present invention. The scope of should be construed to include modifications or variations without departing from the spirit of the invention.

The terminology used herein is a general term that has been widely used as far as possible in view of the functions of the present invention, but may vary according to the intention of a person of ordinary skill in the art to which the present invention belongs, custom or the emergence of a new technology. Can be. In contrast, when a specific term is defined and used in any meaning, the meaning of the term will be described separately. Therefore, the terms used in the present specification should be interpreted based on the actual meaning of the terms and the contents throughout the present specification, rather than simple names of the terms.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings attached to the present specification are provided to easily explain the present invention, and the shapes shown in the drawings may be exaggerated and displayed as necessary to help understanding of the present invention, and thus the present invention is not limited to the drawings.

In the present specification, when it is determined that a detailed description of a known configuration or function related to the present invention may obscure the gist of the present invention, a detailed description thereof will be omitted as necessary.

In the present specification, a structure coupled to the motor and a motor coupled to the structure will be described. In the present specification, a structure for improving the output of the motor and a motor in which the structure is combined will be described.

1. Motor

Here, the motor disclosed in this specification is demonstrated. According to an embodiment of the present invention, the motor may be a permanent magnet (PM) motor. The motor may be an embedded permanent magnet (IPM) motor. The motor may be an embedded permanent magnet synchronous motor (IPMSM).

The motor may be a spoke type motor. However, the present invention is not limited thereto, and the contents of the present invention may be applied to various types of embedded permanent magnet motors in which a barrier for preventing leakage magnetic flux exists.

The motor disclosed herein is applicable to all products for home and commercial use, and is not limited to the motor applied to a specific product.

In the following description, the motor is an IPM spoke type motor unless otherwise specified. However, the present invention is not limited thereto, and the present invention may be applied to the various types of motors described above.

1 briefly illustrates a cross section of an example of the motor 100 described herein. Referring to FIG. 1, the motor 100 may include a stator 110, a rotor 130, and a shaft 150.

The stator 110 may include a stator core 111 having a plurality of slots 113 and a winding 115 wound around the plurality of slots 113.

Each slot 113 may have a trapezoidal or arc-shaped cross section having two sides parallel to the radial direction of the stator core 111 and two sides parallel to the circumferential direction of the stator core 111. Each slot 113 may have an open shape inward of the stator core 111.

The rotor 130 may include a rotor core 131 having a plurality of insertion holes 133 and a plurality of permanent magnets 135 embedded in each of the plurality of insertion holes 133. The rotor 130 may be located inside the stator 110. The rotor core 131 may further include a shaft hole for receiving the shaft 150 to be described later.

The rotor core 131 may include a plurality of core units having a fan-shaped cross section. Each core unit included in the plurality of core units may separate the plurality of permanent magnets.

Although not shown in FIG. 1, the rotor core 130 may include a fixing part for fixing the permanent magnet 135 so that the plurality of permanent magnets 135 are not separated or scattered from the rotor core 130. It may include. The fixing part may prevent the permanent magnet 135 from being separated from the outside of the permanent magnet 135 according to the centripetal force.

The rotor 130 may include an inner rib contacting the inner side of the permanent magnet. The inner lip may be made of the same material as the rotor core 131.

Each of the permanent magnets 135 may have a rectangular cross section in which the rotor of each of the permanent magnets 135 has a radial direction in a length direction and has a width direction perpendicular to the radial direction. In addition, each of the permanent magnets 135 may be provided in the form of a rectangular parallelepiped having a quadrangle parallel to the axial direction of the rotor of each of the permanent magnets 135.

The permanent magnet 135 may be a non-rare earth permanent magnet or a rare earth permanent magnet. For example, the permanent magnet 135 may be a ferrite magnet. In another example, the permanent magnet 135 may be a neodymium (Nd) -based permanent magnet.

The shaft 150 may be located inside the rotor to provide a rotation axis of the rotor. The shaft 150 may be coupled to the rotor by passing through the shaft hole of the rotor.

2. Structure

2.1 Structure fastened to the motor

According to an embodiment of the present invention, a spoke structure coupled to the aforementioned motor may be provided. The spoke structure may be coupled to the rotor of the motor described above to reduce the amount of leakage magnetic flux inside the motor. Specifically, the spoke structure can reduce the leakage of magnetic flux of the permanent magnet of the motor. Hereinafter, the shape and function of the spoke structure will be described.

2 is a plan view (a) and a perspective view (b) of the spoke structure 200 according to an embodiment of the present invention.

The spoke structure may be made of at least some nonmagnetic material. The nonmagnetic material may be selected from non-conductive materials including epoxy-based and engineering plastics, or conductive-based materials including aluminum, stainless steel, and copper.

Referring to FIG. 2B, the spoke structure 200 may include a spoke surface 210 and a plurality of outer bars 230.

Referring to FIG. 2A, the spoke surface 210 may include an inner ring 211, an outer ring 213, and a plurality of spokes 215.

The outer ring 213 may be located outside the inner ring 211. The outer ring 213 may have a concentric shape with the inner ring 211.

The plurality of spokes 215 connect the inner ring 211 and the outer ring 213 and may be disposed radially along the circumferential direction.

At least a portion of the inner ring 211, the outer ring 213, and the plurality of spokes 215 may be provided with a nonmagnetic material.

Meanwhile, in the present specification, the spoke surface 210 is defined for the structure including the inner ring 211, the outer ring 230, and the plurality of spokes 215, but the inner ring 211 and the outer ring ( It only means that the 230 and the plurality of spokes 215 are located in the same plane, it does not mean that the spoke surface 210 is a structure having an area.

The spoke face 210 may include an upper spoke face 210a and a lower spoke face 210b.

The upper spoke surface 210a may include an upper inner ring 211a, an upper outer ring 213a, and a plurality of upper spokes 215a. The lower spoke surface 210b may include a lower inner ring 211b, a lower outer ring 213b, and a plurality of lower spokes 215b.

The upper spoke surface 210a and the lower spoke surface 210b may be provided such that the plurality of upper spokes 215a and the plurality of lower spokes 215b are arranged in parallel. The upper spoke surface 210a and the lower spoke surface 210b may be provided such that the plurality of upper spokes 215a and the plurality of lower spokes 215b are disposed to be offset.

Each outer bar included in the plurality of outer bars 230 may have a longitudinal direction parallel to a circumferential direction of the outer ring 213, a width direction parallel to a radial direction of the outer ring 213, and the outer ring ( 213 may be provided as a rectangular parallelepiped having a height direction parallel to the axial direction.

The plurality of outer bars 230 may be arranged side by side in the axial direction of the inner rings 211a and 211b and the outer rings 213a and 213b. The plurality of outer bars 230 may connect outer rings 213a and 213b of the upper spoke surface 210a and the lower spoke surface 210b.

The plurality of outer bars 230 may be positioned to correspond to the positions of the plurality of spokes 215. The plurality of outer bars 230 may be connected to the plurality of spokes 215. The plurality of outer bars 230 may be connected to the same position where the plurality of spokes 215 are connected to the outer ring 213. The plurality of outer bars 230 may be offset from positions of the plurality of spokes 215.

The number of outer bars 230 may be determined in consideration of the number of spokes. The number of the outer bars 230 may be the same as the number of the spokes 215. The number of the outer bar 230 may be equal to the number of permanent magnets 135 included in the rotor 130 of the motor 100 to which the spoke structure 200 is fastened.

The plurality of outer bars 230 may be made of a nonmagnetic material. The upper spoke surface 210a, the lower spoke surface 210b and the outer bar 230 may be made of a nonmagnetic material and may be provided as one body, that is, as a single rigid body.

3 illustrates the outer bar 230 according to an embodiment of the present invention.

Referring to FIG. 3, the outer bar 230 according to the exemplary embodiment of the present invention may be provided to have fastening portions formed at both sides thereof. The fastening part may be formed concave toward the inner side of the outer bar 230. The fastening part may be coupled to a protrusion formed in a shape corresponding to the fastening part on the rotor core 131 to fix the outer bar 230 to the rotor core 131.

The fastening part may prevent the outer bar 230 from being separated from the rotor core 131. The fastening part may enhance the coupling stability of the permanent magnet 135 to the rotor core 131 by strengthening the fastening of the outer bar 230 to the rotor core 131. In addition, the fastening part may contribute to securing rigidity of the outer bar 230, the spoke structure 200, and further, the high speed rotation of the motor 100.

The protrusion formed on the rotor core may have the same shape as the fixing part described above. The protrusion may have a shape in which the aforementioned fixing part is deformed.

According to another embodiment of the present invention, the spoke structure may further include a plurality of inner bars. 4 is a plan view (a) and a perspective view (b) of the spoke structure 200 for explaining the inner bar 250 according to an embodiment of the present invention.

Referring to FIG. 4, each inner bar included in the plurality of inner bars 250 may have a width direction parallel to the circumferential direction of the inner ring 211 and a length parallel to the radial direction of the inner ring 211. It may be provided in a rectangular parallelepiped having a height direction parallel to the direction and the axial direction of the inner ring 211.

The plurality of inner bars 250 may be arranged side by side in the axial direction. The plurality of inner bars 250 may connect inner rings 211a and 211b of the upper spoke surface 210a and the lower spoke surface 210b.

The plurality of inner bars 250 may be positioned in parallel with the plurality of outer bars 230 with respect to the circumferential direction of the rings. The plurality of inner bars 250 may be positioned to be offset from the plurality of outer bars 230 with respect to the circumferential direction of the rings.

The plurality of inner bars 250 may be positioned to be offset from the plurality of spokes 215a and 215b with respect to the circumferential direction of the rings. The plurality of inner bars 250 may be positioned in parallel with the plurality of spokes 215a and 215b with respect to the circumferential direction of the rings.

The number of inner bars 250 may be equal to the number of spokes 215. The number of inner bars 250 may be the same as the number of outer bars 230. The number of the inner bars 250 may be equal to the number of permanent magnets 135 included in the rotor 130 of the motor 100 to which the spoke structures 200 are fastened.

The plurality of inner bars 250 may be made of a nonmagnetic material to reduce leakage of magnetic flux generated by the permanent magnet. The upper spoke surface 210a, the lower spoke surface 210b, the outer bar 230 and the inner bar 250 may be made of a nonmagnetic material and may be integrally provided, that is, as a single rigid body.

According to another embodiment of the present invention, the spoke structure may further include an inner support member. The spoke structure may optionally include any one of the above-described inner bar and the inner support member.

The inner support member may connect the inner rings of the upper spoke surface and the lower spoke surface. The inner support member may be provided in a cylindrical shape with the top and bottom open. The inner support member may be provided in the form of a polygonal column having a cylindrical cavity.

At least a portion of the inner support member may be provided with a nonmagnetic material to reduce leakage of magnetic flux generated by the permanent magnet. The inner support member may be provided with a portion of the nonmagnetic material in contact with the permanent magnet. The inner support member may be provided with a portion of the non-magnetic material in contact with the shaft.

5 illustrates the spoke structure 200 fastened to the motor 100 in order to explain the inner support member 270 according to an embodiment of the present invention.

Referring to FIG. 5, the inner support member 270 may be fastened to the motor such that an outer surface thereof contacts the shaft side surfaces of the plurality of permanent magnets. The inner support member 270 may be made of at least some nonmagnetic material.

Referring to FIG. 5A, the inner support member 270 of the spoke structure 200 may be fastened adjacent to the shaft hole of the rotor core 130.

Referring to FIG. 5B, the inner support member 270 may provide a shaft hole penetrated by the shaft 150. The inner support member 270 may be fastened to the motor 100 to replace the inner lip structure described above.

The inner support member 270 may be made of a nonmagnetic material to reduce leakage of magnetic flux generated by the permanent magnet. The upper spoke surface 210a, the lower spoke surface 210b, the outer bar 230, and the inner support member 270 may be made of a nonmagnetic material and may be provided integrally, that is, as a single rigid body.

6 illustrates a perspective view (a) and a side view (b) of the spoke structure 200 and the motor 100 to which the spoke structure 200 is coupled according to an embodiment of the present invention.

Referring to FIGS. 6A and 6B, the spoke structure 200 may be fastened to the outer side of the rotor of the motor 100. The spoke structure 200 is fastened to the rotor of the motor 100, it can be rotated integrally with the rotor.

Referring to FIGS. 6A and 6B, the spoke structure 200 may protrude at least partially from the motor 100. The spoke structure 200 may have a height greater than that of the motor 100 and may protrude at least partially from the motor 100. However, this is only an example, and the spoke structure 200 may have the same height as the motor 100 or smaller than the motor 100.

7 illustrates a cross section of the spoke structure and the motor 100 coupled to the spoke structure according to an embodiment of the present invention.

Referring to FIG. 7, the spoke structure 200 may be fastened to the motor 100 such that the plurality of outer bars 230 described above contact the stator side surfaces of the plurality of permanent magnets.

The spoke structure 200 may be fastened to the motor 100 such that the plurality of inner bars 250 are in contact with the side surfaces of the shaft 150 of the plurality of permanent magnets. The spoke structure 200 may be fastened to the motor such that one side of each inner bar included in the plurality of inner bars 250 contacts the shaft side surface of the permanent magnet.

The spoke structure 200 may be fastened to the motor 100 such that the plurality of inner bars 250 described above are positioned at the inner lip. The plurality of inner bars 250 may replace the structure of the inner lip described above. The inner bar 250 may be replaced with the structure of the inner support member described above.

6 and 7 illustrate the spoke structure 200 fastened to the motor based on the spoke structure 200 including all of the above-described components for convenience, the present invention is not limited thereto. It is not clear.

2.2 Motor with Structure

According to an embodiment of the present invention, a motor to which the aforementioned spoke structure is fastened may be provided. The motor to which the spoke structure is fastened may have more improved output efficiency. The amount of magnetic flux leaking from the motor to which the spoke structure is fastened can be reduced than that of the motor that is not.

The motor includes a stator core having a plurality of slots and a stator including a winding wound around the plurality of slots, a rotor core having a plurality of insertion holes formed therein, and a plurality of permanent magnets embedded in each of the plurality of insertion holes. And a shaft positioned inside the rotor and providing a rotation axis of the rotor.

The spoke structure fastened to the rotor has a spoke surface including an inner ring, an outer ring located outside the inner ring, and a plurality of spokes connecting the inner ring and the outer ring and disposed radially along the circumferential direction. It may include. In this case, the spoke surface may include an upper spoke surface and a lower spoke surface.

The spoke structure fastened to the rotor may include a plurality of outer bars disposed parallel to the axial direction of the inner ring and the outer ring to connect outer rings of the upper spoke surface and the lower spoke surface.

The spoke structure fastened to the rotor may be fastened to the motor such that the plurality of outer bars contact the stator side surfaces of the plurality of permanent magnets.

The outer bar may be provided with at least some nonmagnetic material to reduce the leakage of magnetic flux generated by the permanent magnet. The outer bar and / or the inner bar may be made of a nonmagnetic material. The nonmagnetic material may be selected from non-conductive materials including epoxy-based and engineering plastics, or conductive-based materials including aluminum and copper.

The spoke structure fastened to the motor may further include a plurality of inner bars connecting inner rings of the upper spoke surface and the lower spoke surface. In this case, the spoke structure may be fastened to the motor such that the plurality of inner bars contact the shaft side surfaces of the plurality of permanent magnets. The spoke structure may be fastened to the motor such that one side of the plurality of inner bars contacts the shaft side surface of the permanent magnet.

The spoke structure fastened to the motor may further include an inner support member connecting inner rings of the upper spoke surface and the lower spoke surface and provided in the form of a column having a cylindrical cavity. The inner support member may be fastened to the motor such that its outer surface is in contact with the shaft side surfaces of the plurality of permanent magnets. The inner support member may be made of a nonmagnetic material.

3. Experimental data

When using the spoke structure disclosed herein as described above, it can be expected to provide the motor with improved output efficiency and increased rigidity. Hereinafter, the experimental results for the improved characteristics of the motor to which the above-described spoke motor is applied will be described.

FIG. 8 shows the result of the electromagnetic field analysis of the spoke type motor a and the spoke type motor b to which the nonmagnetic structure is fastened according to the related art. Specifically, the results of the electromagnetic field analysis of the spoke type motor (a) according to the conventional method and the spoke type motor (b) in which the outer bar and the inner bar according to the present invention are fastened to the inside and the outside of the permanent magnet.

Referring to FIG. 8, in the case of the spoke type motor to which the nonmagnetic material is fastened, it can be seen that the leakage magnetic flux is reduced as compared to the spoke type motor according to the conventional method. Specifically, in the case of the spoke type motor to which the nonmagnetic material is fastened, the inner bar and the outer bar described above are positioned inside and outside the permanent magnet, respectively, so that the outer side (ie, the barrier) of the permanent magnet compared to the conventional motor. It can be seen that the leakage magnetic flux has decreased in the region) and inside (i.e., the reverse region close to the shaft).

On the other hand, for convenience, although FIG. 8 illustrates an electromagnetic field analysis when the spoke structure including both the outer bar and the inner bar is coupled to the motor, the spoke structure including only one of the outer bar and the inner bar is Even when coupled to the motor, it will be apparent from the knowledge of a person skilled in the art that the effect of reducing leakage magnetic flux is expected as shown in FIG.

Table 1 is a table showing the output characteristics and the motor stiffness analysis results of the spoke type motor (A) and the spoke type motor (B) to which the nonmagnetic structure is coupled according to the conventional method.

Referring to Table 1, by inserting the non-magnetic structure according to the present invention into the motor it can be seen that the leakage magnetic flux is reduced to improve the output characteristics of the motor 3.16%, the stiffness safety factor is improved to 60.81%. In this way, as the rigid safety factor is improved, the output of the motor may be further improved by increasing the length of the permanent magnet.

Torque (N? Em) Output (W) Safety Factor (15080rpm) A 1.1361 414.02 6.66 B 1.1720 (3.16%) 427.11 (3.16%) 10.71 (60.81%)

9 shows a graph for comparing the torque output of the spoke type motor A and the spoke type motor B to which the nonmagnetic structure is fastened according to the conventional method. 9, it can be seen that the output performance of the spoke type motor B to which the nonmagnetic structure is fastened is better than the spoke type motor A according to the conventional method.

10 shows a graph for comparing torque output of the spoke type motor according to the conventional method and the spoke type motor to which the inner support member according to the present invention is applied.

10A is a torque output of a spoke type motor according to a conventional method, and B and C of FIG. 10 are torque outputs of a spoke type motor to which the above-described inner support member is applied to the motor. Specifically, B of FIG. 10 is a torque output of a spoke type motor to which an inner support member provided with a non-magnetic material has a portion of the shaft side, and FIG. 10C is a spoke type motor to which an inner support member provided with a non-magnetic material is applied. Torque output is shown.

Referring to FIG. 10, it can be seen that the torque outputs B and C of the spoke type motor to which the inner support member according to the present invention is applied are superior to the torque output A of the spoke type motor according to the conventional method. In addition, referring to FIG. 10, in the spoke type motor to which the inner support member according to the present invention is applied, the torque output C of the motor to which the inner support member is applied is a nonmagnetic material, and the shaft side is partially made of a nonmagnetic material. It can be seen that the output efficiency is superior to the motor (B) to which the inner support member provided is applied. Referring to FIG. 10, the torque output B of the motor to which the inner support member provided with a non-magnetic material is partially formed of the non-magnetic material, and the inner support is a non-magnetic material. It can be seen that the torque output C of the motor to which the member is applied is improved by about 50% and 56%, respectively.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present invention described above may be implemented separately or in combination with each other.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (16)

A stator comprising a stator core having a plurality of slots and a winding wound around the plurality of slots; A rotor having a rotor core having a plurality of insertion holes and a plurality of permanent magnets embedded in each of the plurality of insertion holes; And a shaft positioned inside the rotor to provide a rotation axis of the rotor. In the spoke structure is coupled to the rotor of the motor having a reduced magnetic flux amount inside the motor,
An inner ring, an outer ring located outside of the inner ring, and a spoke surface connecting the inner ring and the outer ring and radially disposed along the circumferential direction, the spoke surface comprising a plurality of spokes extending radially from the inner ring; The spoke surface comprises an upper spoke surface and a lower spoke surface, wherein the inner ring, the outer ring and the plurality of spokes are provided integrally; And
A plurality of outer bars disposed side by side in the axial direction of the inner ring and the outer ring to connect outer rings of the upper spoke surface and the lower spoke surface and extend in the axial direction from the outer ring; And
A plurality of inner bars disposed in parallel in the axial direction of the inner ring and the outer ring to connect inner rings of the upper spoke surface and the lower spoke surface and extend in the axial direction from the inner ring; Including,
The plurality of outer bars extend in the axial direction from a plurality of points where the plurality of spokes included in the spoke surface are connected to the outer ring,
The plurality of inner bars extend in the axial direction from a plurality of points where the plurality of spokes included in the spoke surface are connected to the inner ring,
The plurality of outer bars are in contact with the stator side surfaces of the plurality of permanent magnets, and the plurality of inner bars are fastened to the motor to be in contact with the shaft side surfaces of the plurality of permanent magnets,
The spoke surface, the plurality of outer bars and the plurality of inner bars are integrally provided to minimize deformation due to rotation of the motor, and the plurality of outer bars to reduce leakage of magnetic flux generated by the permanent magnet. Is prepared from nonmagnetic materials,
Spoke structure.
delete delete The method of claim 1,
And an inner support member connecting inner rings of the upper spoke surface and the lower spoke surface;
The inner support member is fastened to the motor such that its outer surface is in contact with the shaft side surfaces of the plurality of permanent magnets,
Spoke structure.
The method of claim 4, wherein
The inner support member is provided with at least a portion of the non-magnetic material in contact with the permanent magnet,
Spoke structure.
The method of claim 4, wherein
The inner support member is provided in a cylindrical shape with the top and bottom open,
Spoke structure.
The method of claim 4, wherein
The inner support member is provided in the form of a polygonal column having a cylindrical cavity,
Spoke structure.
The method of claim 4, wherein
The inner support member is provided integrally with the shaft
Spoke structure.
The method of claim 1,
The upper spoke surface, the lower spoke surface, the outer bar and the inner bar are made of a nonmagnetic material and are formed integrally,
Spoke structure.
The method of claim 1,
The nonmagnetic material is selected from non-conductive materials, including epoxy-based and engineering plastics, or conductive-based materials including aluminum, stainless steel, and copper.
Spoke structure.
The method of claim 1,
Each of the outer bars included in the plurality of outer bars is provided so that fastening portions are formed on both sides thereof, and the fastening portions are formed concave inwardly of the outer bar.
The fastening part is coupled to a protrusion formed in a shape corresponding to the fastening part on the rotor core to fix the outer bar to the rotor core.
Spoke structure.
In the embedded permanent magnet type motor,
A stator comprising a stator core having a plurality of slots and a winding wound around the plurality of slots;
A rotor having a rotor core having a plurality of insertion holes and a plurality of permanent magnets embedded in each of the plurality of insertion holes;
A shaft positioned inside the rotor to provide an axis of rotation of the rotor; And
A spoke structure coupled to the rotor to reduce the amount of leakage magnetic flux inside the motor;
Including,
The spoke structure
An inner ring, an outer ring located outside of the inner ring, and a spoke surface connecting the inner ring and the outer ring and radially disposed along the circumferential direction, the spoke surface comprising a plurality of spokes extending radially from the inner ring; The spoke surface comprises an upper spoke surface and a lower spoke surface, wherein the inner ring, the outer ring and the plurality of spokes are integrally provided; And
A plurality of outer bars disposed side by side in the axial direction of the inner ring and the outer ring to connect outer rings of the upper spoke surface and the lower spoke surface and extend in the axial direction from the outer ring; And
A plurality of inner bars disposed in parallel in the axial direction of the inner ring and the outer ring to connect inner rings of the upper spoke surface and the lower spoke surface and extend in the axial direction from the inner ring; Including,
The plurality of outer bars extend in the axial direction from a plurality of points where the plurality of spokes included in the spoke surface are connected to the outer ring,
The plurality of inner bars extend in the axial direction from a plurality of points where the plurality of spokes included in the spoke surface are connected to the inner ring,
The spoke structure is fastened to the motor such that the plurality of outer bars contact the stator side surfaces of the plurality of permanent magnets, and the plurality of inner bars contact the shaft side surfaces of the plurality of permanent magnets,
The spoke surface, the plurality of outer bars and the plurality of inner bars are integrally provided so that deformation due to rotation of the motor is minimized, and the spoke structure is formed at least to reduce leakage of magnetic flux generated by the permanent magnet. Partly made of non-magnetic material,
motor.
delete The method of claim 12,
The outer bar and the inner bar are made of a nonmagnetic material,
motor.
The method of claim 12,
The nonmagnetic material is selected from non-conductive materials, including epoxy-based and engineering plastics, or conductive-based materials including aluminum, stainless steel, and copper.
motor.
The method of claim 12,
The spoke structure
An inner support member connecting the inner rings of the upper spoke surface and the lower spoke surface and provided in the form of a column having a cylindrical cavity;
The inner support member is fastened to the motor such that its outer surface is in contact with the shaft side surfaces of the plurality of permanent magnets,
The inner support member is made of a nonmagnetic material,
motor.

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