WO2024144098A1

WO2024144098A1 - Axial flux motor comprising dual rotor assembly having interior permanent magnets applied thereto

Info

Publication number: WO2024144098A1
Application number: PCT/KR2023/021253
Authority: WO
Inventors: 송도훈; 장병국
Original assignee: 주식회사 엔엠씨
Priority date: 2022-12-29
Filing date: 2023-12-21
Publication date: 2024-07-04
Also published as: KR20240105971A

Abstract

The present invention relates to a motor having a dual rotor structure having a first rotor, a second rotor, and a stator between the first and second rotors, wherein a magnetic flux path is formed so as to circulate two magnets, adjacent to each other, among first magnets, the main body of a first back yoke, the stator, two other magnets, disposed adjacent to each other and opposite to said two magnets, among second magnets, and the main body of a second back yoke, and first and second protrusions can generate a reluctance torque, thereby having the effect of improving torque density and output density.

Description

Axial flux motor with dual rotor assembly with internal permanent magnets

The present invention relates to motors, and more specifically, to an axial magnetic flux type motor including a dual rotor assembly to which an interior permanent magnet (IPM) is applied.

An axial flux motor including a dual rotor assembly may have a ferromagnetic back-yoke attached to the magnetic assembly. The back yoke may have a flat shape, and a plurality of magnetic substances included in the magnetic body assembly may be arranged along the back yoke to be spaced apart from each other by a predetermined distance. No change in reluctance occurs in the space spaced apart from each of the plurality of magnetic materials having a transmittance similar to that of air. Accordingly, in an axial magnetic flux type motor including a dual rotor assembly with a back yoke having a flat shape, only magnetic torque generated by the force between a plurality of magnetic materials can be generated.

The present invention seeks to provide an axial magnetic flux type motor including a dual rotor assembly to which IPM is applied, which can improve dock density and power density by generating reluctance torque in addition to magnetic torque.

The motor 1 according to the present invention includes a dual rotor including a first rotor 10 and a second rotor 20; and a stator 30 disposed between the first rotor 10 and the second rotor 20. The first rotor 10 may include a first back yoke 11 and a first magnetic assembly 12. The first back yoke 11 may include a plurality of first protrusions that protrude from one surface of the main body of the first back yoke 11 to be spaced apart from each other by a predetermined distance. The first magnetic body assembly 12 may include a plurality of first magnetic substances disposed in spaced apart spaces between the plurality of first protrusions. The second rotor 20 includes a second back yoke 21 and a second magnetic body disposed opposite to the first back yoke 11 and the first magnetic body assembly 12 with respect to the stator 30. It may include an assembly (22). The second back yoke 21 may include a plurality of second protrusions disposed opposite to the plurality of first protrusions. The second magnetic body assembly 22 may include a plurality of second magnetic substances disposed opposite to the plurality of first magnetic substances. At least one magnetic flux path formed in the dual rotor includes two adjacent magnetic materials among the plurality of first magnetic materials, the main body of the first back yoke 11, the stator 30, and the second magnetic materials. It may be formed to circulate around the other two magnetic materials disposed adjacent to each other opposite to the two magnetic materials and the main body of the second back yoke 21. The plurality of first protrusions and the plurality of second protrusions may generate reluctance torque.

The axial magnetic flux motor including a dual rotor assembly to which IPM is applied according to the present invention has the effect of improving dock density and power density by generating reluctance torque in addition to magnetic torque.

Figure 1 is a cross-sectional view based on the x-y plane showing an axial flux-type motor (1) including dual rotors (10, 20) to which IPM is applied according to the present invention.

Figure 2 is a perspective view showing an axial flux-type motor (1) including dual rotors (10, 20) to which IPM is applied according to the present invention.

Figure 3 is an exploded view of an axial flux-type motor (1) including dual rotors (10, 20) to which IPM is applied according to the present invention.

Figure 4 is a cross-sectional view based on the x-y plane showing an axial flux type motor (1) including dual rotors (10, 20) to which IPM is applied according to the present invention.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the attached drawings. In the following description of the present invention, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. The terms described below are defined in consideration of the functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

For the same reason, some components are exaggerated, omitted, or schematically shown in the accompanying drawings. Additionally, the size of each component does not entirely reflect its actual size. In each drawing, identical or corresponding components are assigned the same reference numbers.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments invented below and can be implemented in various different forms, but the present embodiments are provided to ensure that the inventors of the present invention are complete and those skilled in the art It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

In the following description of the present invention, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

Terms used in the present invention are merely used to describe specific embodiments and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as generally understood by a person of ordinary skill in the technical field described in the present invention. Among the terms used in the present invention, terms defined in general dictionaries may be interpreted to have the same or similar meaning as the meaning they have in the context of related technology, and unless clearly defined in the present invention, have an ideal or excessively formal meaning. It is not interpreted as In some cases, even terms defined in the present invention cannot be interpreted to exclude embodiments of the present invention.

The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. .

1 and 2, the axial flux type motor 1 may include a first rotor 10, a second rotor 20, a stator 30, a shaft 40, and a housing 50. You can. The stator 30 may be disposed between the first rotor 10 and the second rotor 20 based on the x-y plane. The shaft 40 may be arranged to penetrate the center of the first rotor 10, the center of the second rotor 20, the center of the stator 30, and the center of the housing 50, based on the x-y plane. . The first rotor 10, the second rotor 20, and the stator 30 may be disposed inside the housing 50. One surface of the first rotor 10 may be arranged to face one surface of the stator 30. One surface of the second rotor 20 may be arranged to face the other surface of the stator 30.

The first rotor 10 and the second rotor 20 may be referred to as a first rotor and a second rotor. The stator 30 may be referred to as a stator. When current flows through the coils of the stator 30, a magnetic field may be formed in the first rotor 10 and the second rotor 20. Due to the magnetic field, the first rotor 10 and the second rotor 20 may rotate around the shaft 40.

Referring to FIG. 3 , the first rotor 10 may include a first back-yoke 11 and a first magnetic assembly 12. The first back yoke 11 may include a plurality of

protrusions

11a, 11b, 11c, 11d, 11e, 11f, 11g, 11h, 11i, 11j, 11k, 11l, 11m, 11n, 11o, 11p. . The first magnetic body assembly 12 may include a plurality of

magnetic substances

12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i, 12j, 12k, 12l, 12m, 12n, 12o, 12p. .

A plurality of protrusions (11a, 11b, 11c, 11d, 11e, 11f, 11g, 11h, 11i, 11j, 11k, 11l, 11m, 11n, 11o, 11p) are located along the x-axis from the main body of the first back yoke (11). It may have a shape that protrudes in one direction. A plurality of protrusions (11a, 11b, 11c, 11d, 11e, 11f, 11g, 11h, 11i, 11j, 11k, 11l, 11m, 11n, 11o, 11p) are located on the first back yoke (11) based on the x-z plane. They can be arranged to be spaced apart from each other by a predetermined distance along the circumference of the main body.

Each of the plurality of magnetic materials (12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i, 12j, 12k, 12l, 12m, 12n, 12o, 12p) has a first back yoke (11) based on the x-z plane. ), a plurality of protrusions (11a, 11b, 11c, 11d, 11e, 11f, 11g, 11h, 11i, 11j, 11k, 11l, 11m, 11n, 11o, 11p) are disposed in spaced apart spaces. You can.

Each of the plurality of magnetic materials (12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i, 12j, 12k, 12l, 12m, 12n, 12o, 12p) includes a N pole and an S pole in the y-axis direction. can do. Each of a plurality of magnetic materials (12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i, 12j, 12k, 12l, 12m, 12n, 12o, 12p) is located along the circumference of the first back yoke (11). The polarities of neighboring magnetic materials may be different.

The second rotor 20 may include a second back yoke 21 and a second magnetic assembly 22. The second back yoke 21 has a plurality of

protrusions

11a, 11b, 11c, 11d, 11e, 11f, 11g, 11h, 11i, 11j, 11k, 11l, 11m, 11n, 11o of the first back yoke 11. , may include a plurality of protrusions (not shown) corresponding to 11p). The second magnetic body assembly 22 includes a plurality of

magnetic substances

12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i, 12j, 12k, 12l, 12m, 12n, 12o of the first magnetic assembly 12. , may include a plurality of magnetic materials (not shown) corresponding to 12p).

A plurality of protrusions (11a, 11b, 11c, 11d, 11e, 11f, 11g, 11h, 11i, 11j, 11k, 11l, 11m, 11n, 11o, 11p) according to the present invention, and a plurality of protrusions (11a, A plurality of protrusions (not shown) corresponding to 11b, 11c, 11d, 11e, 11f, 11g, 11h, 11i, 11j, 11k, 11l, 11m, 11n, 11o, 11p) are internal permanent magnets (Interior Permanent Magnet, It may be referred to as IPM).

Referring to FIG. 4 , the first rotor 10 may include a first back yoke 11 and a first magnetic body assembly 12. The first back yoke 11 may include a first protrusion 11a, a second protrusion 11b, and a third protrusion 11c. The first magnetic body assembly 12 may include a first magnetic body 12a, a second magnetic body 12b, a third magnetic body 12c, and a fourth magnetic body 12d.

Although not shown in FIG. 4 for convenience of explanation, the first back yoke 11 has a fourth protrusion 11d, a fifth protrusion 11e, a sixth protrusion 11f, and a seventh protrusion 11g as shown in FIG. 3. ), the 8th protrusion (11h), the 9th protrusion (11i), the 10th protrusion (11j), the 11th protrusion (11k), the 12th protrusion (11l), the 13th protrusion (11m), the 14th protrusion (11n) , a 15th protrusion 11o, and a 16th protrusion 11p.

In addition, the first magnetic body assembly 12 includes a fifth magnetic material (12e), a sixth magnetic material (12f), a seventh magnetic material (12g), an eighth magnetic material (12h), a ninth magnetic material (12i), and a tenth magnetic material (12j). ), an 11th magnetic material (12k), a 12th magnetic material (12l), a 13th magnetic material (12m), a 14th magnetic material (12n), a 15th magnetic material (12o), and a 16th magnetic material (12p). .

The first magnetic material 12a may be disposed between the first protrusion 11a and the sixteenth protrusion 11p (not shown) based on the x-y plane. The second magnetic material 12b may be disposed between the first protrusion 11a and the second protrusion 11b based on the x-y plane. The third magnetic material 12c may be disposed between the second protrusion 11b and the third protrusion 11c based on the x-y plane. The fourth magnetic material 12d may be disposed between the third protrusion 11c and the fourth protrusion 11d (not shown) based on the x-y plane.

For example, the first magnetic material 12a may have an N pole on one side and an S pole on the other side in the y-axis direction. The second magnetic material 12b may have an N pole on one side and an S pole on the other side in the y-axis direction. The third magnetic material 12c may have an S pole on one side and an N pole on the other side in the y-axis direction. The fourth magnetic material 12d may have an S pole on one side and an N pole on the other side in the y-axis direction.

The second rotor 20 may include a second back yoke 21 and a second magnetic body assembly 22. The second back yoke 21 may include a first protrusion 21a, a second protrusion 22b, and a third protrusion 21c. The second magnetic body assembly 22 may include a first magnetic body 22a, a second magnetic body 22b, a third magnetic body 22c, and a fourth magnetic body 22d.

Although not shown in FIG. 4 for convenience of explanation, the second magnetic body assembly 22 includes the fifth magnetic body 12e, the sixth magnetic body 12f, the seventh magnetic body 12g, and the first magnetic body assembly 12. 8 magnetic material (12h), 9th magnetic material (12i), 10th magnetic material (12j), 11th magnetic material (12k), 12th magnetic material (12l), 13th magnetic material (12m), 14th magnetic material (12n), 15th magnetic material It may further include a fifth to sixteenth magnetic material corresponding to the magnetic material 12o and the sixteenth magnetic material 12p.

In addition, the second back yoke 21 includes the fourth protrusion 11d, the fifth protrusion 11e, the sixth protrusion 11f, the seventh protrusion 11g, and the eighth protrusion (11g) of the first back yoke 11. 11h), the 9th protrusion 11i, the 10th protrusion 11j, the 11th protrusion 11k, the 12th protrusion 11l, the 13th protrusion 11m, the 14th protrusion 11n, the 15th protrusion 11o. ), and may further include fourth to sixteenth protrusions corresponding to the sixteenth protrusion (11p).

The first magnetic material 22a may be disposed between the first protrusion 21a and the sixteenth protrusion 21p (not shown) based on the x-y plane. The second magnetic material 22b may be disposed between the first protrusion 21a and the second protrusion 21b based on the x-y plane. The third magnetic material 21c may be disposed between the second protrusion 21b and the third protrusion 21c based on the x-y plane. The fourth magnetic material 22d may be disposed between the third protrusion 21c and the fourth protrusion 21d (not shown) based on the x-y plane.

For example, the first magnetic material 22a may have an N pole on one side and an S pole on the other side in the y-axis direction. The second magnetic material 22b may have an N pole on one side and an S pole on the other side in the y-axis direction. The third magnetic material 22c may have an S pole on one side and an N pole on the other side in the y-axis direction. The fourth magnetic material 22d may have an S pole on one side and an N pole on the other side in the y-axis direction.

The axial flux motor (1) including the dual rotors (10, 20) according to the present invention can form a plurality of magnetic fields (101, 102, 103).

For example, the first magnetic field 101 is applied to the first magnetic material 12a, the second magnetic material 12b, the stator 30, and the second magnetic material assembly 22 of the first magnetic material assembly 12 based on the x-y plane. It can circulate clockwise through the second magnetic material 22b and the first magnetic material 22a. The first magnetic field 101 may generate a change in magnetic reluctance by the first protrusion 11a of the first back yoke 11 and the first protrusion 21a of the second back yoke 21. there is. For example, the first protrusion 21a may generate reluctance torque.

For example, the second magnetic field 102 is applied to the second magnetic material 12b, third magnetic material 12c, stator 30, and second magnetic material assembly 22 of the first magnetic material assembly 12 based on the x-y plane. It can circulate counterclockwise through the third magnetic material 22c and the second magnetic material 22b. The second magnetic field 102 may generate a change in magnetic reluctance by the second protrusion 11b of the first back yoke 11 and the second protrusion 21b of the second back yoke 21. For example, the second protrusion 21b may generate reluctance torque.

For example, the third magnetic field 103 is applied to the third magnetic material 12c, fourth magnetic material 12d, stator 30, and second magnetic material assembly 22 of the first magnetic material assembly 12 based on the x-y plane. It can circulate clockwise through the fourth magnetic material 22d and the third magnetic material 22c. The third magnetic field 103 may generate a change in magnetic reluctance by the third protrusion 11c of the first back yoke 11 and the third protrusion 21c of the second back yoke 21. For example, the third protrusion 21c may generate reluctance torque.

In the specific embodiments of the present invention described above, components included in the present invention are expressed in singular or plural numbers depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present inventor is not limited to singular or plural components, and even components expressed in plural may be composed or expressed in the singular. Even if it is a single component, it can be composed of multiple elements.

Meanwhile, the embodiments of the present invention disclosed in the specification and drawings are merely provided as specific examples to easily explain the technical content of the present invention and aid understanding of the present invention, and are not intended to limit the scope of the present invention. In other words, it is obvious to those skilled in the art that other modifications based on the technical idea of the present invention can be implemented. Additionally, each of the above embodiments can be operated in combination with each other as needed. In addition, the embodiments of the present invention may also be implemented in other modifications based on the technical idea of the embodiments.

The present disclosure may be used in industrial fields related to axial flux type motors.

Claims

In the motor (1),

A dual rotor including a first rotor 10 and a second rotor 20; and

It includes a stator 30 disposed between the first rotor 10 and the second rotor 20,

The first rotor 10 includes a first back yoke 11 and a first magnetic assembly 12,

The first back yoke 11 includes a plurality of first protrusions that protrude from one surface of the main body of the first back yoke 11 to be spaced apart from each other by a predetermined distance,

The first magnetic body assembly 12 includes a plurality of first magnetic bodies disposed in spaced apart spaces between the plurality of first protrusions,

The second rotor 20 includes a second back yoke 21 and a second magnetic body disposed opposite to the first back yoke 11 and the first magnetic body assembly 12 with respect to the stator 30. comprising an assembly (22);

The second back yoke 21 includes a plurality of second protrusions disposed opposite to the plurality of first protrusions,

The second magnetic body assembly 22 includes a plurality of second magnetic substances disposed opposite to the plurality of first magnetic substances,

At least one magnetic flux path formed in the dual rotor includes two adjacent magnetic materials among the plurality of first magnetic materials, the main body of the first back yoke 11, the stator 30, and the second magnetic materials. Two other magnetic materials are disposed adjacent to each other opposite to the two magnetic materials, and are formed to circulate around the main body of the second back yoke (21),

The motor (1), wherein the plurality of first protrusions and the plurality of second protrusions generate a reluctance torque.
According to claim 1,

Motor (1), wherein the first back yoke (11) includes a first protrusion (11a).
According to clause 2,

The first magnetic body assembly 12 includes a first magnetic body 12a disposed adjacent to one side of the first protrusion 11a and forming a magnetic field in a first direction that is the axial direction of the motor 1, and A motor (1) including a second magnetic body (12b) disposed adjacent to the other side of the first protrusion (11a) and forming a magnetic field in a second direction opposite to the first direction.
According to clause 3,

The second back yoke (21) includes a first protrusion (21a) opposing the first protrusion (11a) with respect to the stator (30).
According to clause 4,

The second magnetic body assembly 12 faces the first magnetic body 12a with respect to the stator 30 and is disposed adjacent to one side of the first protrusion 21a, forming a magnetic field in the first direction. A first magnetic material 22a, which faces the second magnetic material 12b with respect to the stator 30 and is disposed adjacent to the other side of the first protrusion 21a, forms a magnetic field in the second direction. A motor (1) including a second magnetic material (22b).
According to clause 5,

The first magnetic material 12a and the second magnetic material 12b of the first magnetic material assembly 12, and the first magnetic material 22a and the first magnetic material 22b of the second magnetic material assembly 22 are A first magnetic flux path 101 forming a loop in a first rotation direction is generated, and the first magnetic flux path 101 includes the first magnetic body 12a, the main body of the first back yoke 11, and the first magnetic flux path 101. It is formed to circulate in order through two magnetic materials (12b), the stator (30), the first magnetic material (22a), and the first magnetic material (22b),

The first magnetic flux path 101 is formed so that the first protrusion 11a of the first back yoke 11 and the first protrusion 21a of the second back yoke 21 do not circulate, the motor 1 ).
According to claim 1,

The motor (1), wherein each of the plurality of first magnetic materials is arranged to have different polarities between neighboring magnetic materials.
According to clause 7,

The plurality of first magnetic materials include a first magnetic material (12a) and a second magnetic material (12b),

One side of the first magnetic material 12a is the N pole, and the other side is the S pole,

The motor (1), wherein one side of the second magnetic material (12b) is the S pole and the other side is the N pole.
According to claim 1,

The motor (1), wherein each of the plurality of second magnetic materials is arranged to have different polarities between neighboring magnetic materials.
According to clause 9,

The plurality of second magnetic materials include a first magnetic material (22a) and a second magnetic material (22b),

One side of the first magnetic material 22a is the N pole, and the other side is the S pole,

The motor (1) wherein one side of the second magnetic material (22b) is the S pole, and the other side is the N pole.