Rotor core and motor rotor

Abstract

The application relates to the technical field of motors, in particular to a rotor core and a motor rotor, which comprise a core body, the core body comprises a plurality of ring-shaped magnetic conductors which are arranged at intervals, a magnetic steel slot is formed between the first side wall portions of adjacent magnetic conductors, along the radial direction of the core body, from inside to outside, the magnetic steel slot comprises a bottom opening, a middle opening and an outer opening, the width of the bottom opening is smaller than that of the middle opening, and the width of the outer opening is smaller than that of the middle opening. By matching the sizes of the bottom opening, the middle opening and the outer opening of the magnetic steel slot, the magnetic steel can obtain more optimal arrangement space in the radial direction and the magnetic line direction, meanwhile, by ensuring that the magnetic conductors have sufficient structural sizes, the magnetic line distribution is more uniform, which is beneficial to improving the torque output of the motor, reducing the vibration noise caused by the magnetic field distortion and improving the overall operation performance of the motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a rotor core and a motor rotor. Background Technology

[0002] like Figure 1 As shown in the related technologies, the permanent magnets generally adopt a straight-face structure on both sides. This arrangement is limited by space and magnetic circuit design, making it impossible to effectively place more permanent magnets into the magnetic slots of the rotor core. This results in lower power density of the motor, increased cost, and may even lead to a decrease in motor performance. Summary of the Invention

[0003] The purpose of this invention is to solve one of the problems pointed out in the background art, and to provide a rotor core and a motor rotor.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A rotor core includes a core body, the core body including a plurality of magnetic conductors arranged in a ring and spaced apart, and a magnetic groove is formed between the first sidewall portions of adjacent magnetic conductors, extending radially from the inside to the outside of the core body. The magnetic groove includes a bottom opening, a middle opening and an outer opening, the width of the bottom opening being smaller than the width of the middle opening and the width of the outer opening being smaller than the width of the middle opening.

[0006] The rotor core proposed in this invention has the following advantages: by adopting the above-mentioned rotor core structure, the magnets can obtain better arrangement space in both the radial and magnetic field lines directions through the size matching of the bottom, middle and outer openings of the magnet slots. At the same time, by ensuring that the magnetic conductor has sufficient structural size, the magnetic field lines are more evenly distributed, which is conducive to improving the torque output of the motor and reducing the vibration noise caused by magnetic field distortion, thereby improving the overall operating performance of the motor.

[0007] An electric motor rotor includes a plurality of permanent magnets and the rotor core described above, wherein the plurality of permanent magnets are arranged one-to-one in corresponding magnetic slots.

[0008] The motor rotor proposed in this invention has the following advantages: the motor rotor using the rotor core of this invention can make the magnetic lines of force distribution of the entire motor more uniform, which is conducive to improving the torque output of the motor and reducing the vibration noise caused by magnetic field distortion, thereby improving the overall operating performance of the motor. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a rotor structure in the prior art;

[0010] Figure 2 This is a three-dimensional structural diagram of one embodiment of the present invention;

[0011] Figure 3 This is a top view of the rotor core of the first embodiment of the present invention.

[0012] Figure 4 This is a top view of the rotor core of the second embodiment of the present invention;

[0013] Figure 5 This is a top view of the rotor core of the third embodiment of the present invention;

[0014] Figure 6 This is a top view of the fourth embodiment of the rotor core of the present invention;

[0015] Figure 7 This is a top view of the fifth embodiment of the rotor core of the present invention;

[0016] Figure 8 This is a top view of the sixth embodiment of the rotor core of the present invention;

[0017] Figure 9 This is a top view schematic diagram of one embodiment of the motor rotor of the present invention;

[0018] Figure 10 This is a partial top view of one embodiment of the motor rotor of the present invention. Figure 1 ;

[0019] Figure 11 This is a partial top view of one embodiment of the motor rotor of the present invention. Figure 2 ;

[0020] Figure 12 This is a top view of the magnetic conductor structure of the present invention;

[0021] Figure 13 This is a top view schematic diagram of the permanent magnet structure of the present invention;

[0022] Figure 14 This is a schematic diagram of the magnetic field line distribution when the motor of the present invention is working;

[0023] Figure 15 This is a schematic diagram of one embodiment of the invention, in which the first sidewall portion employs two straight sections.

[0024] Figure 16 This is a schematic diagram of one embodiment of the invention where the first sidewall portion adopts a multi-segment arc-shaped surface.

[0025] Figure 17 This is a schematic diagram of one embodiment of the invention, in which the first sidewall portion adopts an arc-shaped surface and a straight surface.

[0026] In the figure: 1. Iron core body; 2. Magnetic conductor; 3. Magnet groove; 4. Permanent magnet; 5. Through hole; 6. First side wall; 7. Limiting protrusion; 8. Cylinder; 11. Second side wall; 13. Bottom opening; 14. Middle opening; 15. Outer opening; 16. Gap; 17. First straight section; 18. First arc section; 19. Second arc section; 20. Third arc section; 21. Second straight section; 22. Third straight section. Detailed Implementation

[0027] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Other technical solutions obtained by those skilled in the art without inventive effort are all within the protection scope of this application. Furthermore, it should be understood that terms indicating orientation or positional relationships, such as "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," are based solely on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device / component must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Reference Figures 2-17 A rotor core includes a core body 1. The core body 1 includes a plurality of magnetic conductors 2 arranged in a ring and spaced apart. A magnetic groove 3 is formed between the first sidewall portions 6 of adjacent magnetic conductors 2. Along the radial direction of the core body 1 from the inside to the outside, the magnetic groove 3 includes a bottom opening 13, a middle opening 14, and an outer opening 15. The width of the bottom opening 13 is smaller than the width of the middle opening 14, and the width of the outer opening 15 is smaller than the width of the middle opening 14.

[0029] By using a smaller bottom opening 13, interference with the permanent magnet during assembly can be avoided, while increasing the effective length of the permanent magnet in the radial direction, thereby improving the magnetic flux output capability. By increasing the width of the middle opening 14, the thickness of the permanent magnet in the direction of the magnetic field lines can be increased, thereby increasing the magnetic flux provided by the permanent magnet. By reducing the width of the outer opening 15, sufficient structural dimensions are reserved for the magnetic conductor 2 to ensure the continuity of the magnetic circuit, avoid magnetic circuit abrupt changes that cause magnetic field distortion, and make the air gap magnetic field tend to be smoothly distributed.

[0030] By adopting the above-mentioned rotor core structure, the permanent magnets can obtain better arrangement space in both the radial and magnetic field lines directions by matching the dimensions of the bottom opening 13, middle opening 14 and outer opening 15 of the magnet slot 3. At the same time, by ensuring that the magnetic conductor 2 has sufficient structural dimensions, the magnetic field lines are more evenly distributed, which is conducive to improving the torque output of the motor and reducing the vibration noise caused by magnetic field distortion, thereby improving the overall operating performance of the motor.

[0031] refer to Figures 2-3In one embodiment, the portion of the first sidewall 6 corresponding to the bottom opening 13 to the middle opening 14 is composed of a first arc surface; and / or the portion of the first sidewall 6 corresponding to the middle opening 14 to the outer opening 15 is composed of a second arc surface.

[0032] The entire first sidewall 6 adopts an arc-shaped structure, which can form a uniform covering effect on the permanent magnet, resulting in uniform force distribution and uniform magnetic field lines. The magnetic conductor with gradually increasing width along the radial direction of the rotor core can better guide the distribution of magnetic field lines and prevent distortion of the air gap magnetic flux density waveform caused by abrupt changes in the structure of the magnetic conductor, thereby avoiding large vibration noise from the motor.

[0033] In one implementation, the first and second arc surfaces have the same curvature, for example, by using the same segment of a circle.

[0034] Of course, different curvatures of the first and second arc surfaces can also meet the requirements of this invention and are also within the scope of protection of this application.

[0035] refer to Figures 2-3 In another embodiment, the portion of the first sidewall 6 corresponding to the bottom opening 13 to the middle opening 14 is composed of a first multi-segment surface; and / or the portion of the first sidewall 6 corresponding to the middle opening 14 to the outer opening 15 is composed of a second multi-segment surface. The multi-segment surface structure of the first sidewall 6 can also form a covering effect on the permanent magnet. Compared with the traditional limiting protrusion structure, the magnetic field lines are more evenly distributed and the magnetic leakage phenomenon is smaller.

[0036] As one implementation method, when a multi-segment structure is used, the magnetic field lines are more uniform, and the problem of magnetic leakage is reduced.

[0037] In one implementation, the first multi-segment surface and the second multi-segment surface are symmetrically distributed along the central opening 14.

[0038] Of course, the fact that the first multi-segment surface and the second multi-segment surface are not symmetrically distributed is also within the scope of protection of this application.

[0039] refer to Figure 15 In one embodiment, the first sidewall portion 6 includes a plurality of second straight sections 21 and a plurality of third straight sections 22; the first sidewall portion 6 may adopt a V-shaped two-section structure, and whether the second straight sections 21 and the third straight sections 22 are symmetrically arranged is within the scope of protection of this application.

[0040] refer to Figure 16 In one embodiment, the first sidewall portion 6 includes a plurality of second arcuate portions 19 and a plurality of third arcuate portions 20. In this embodiment, the first sidewall portion 6 employs multiple arcuate portion structures, and the curvatures of the second arcuate portions 19 and the third arcuate portions 20 are within the scope of protection of this application, regardless of whether they are the same.

[0041] refer to Figure 17 In one embodiment, the first sidewall portion 6 includes a plurality of first straight face portions 17 and a plurality of first curved face portions 18. In this embodiment, the first sidewall portion 6 is provided in a manner that combines the first straight face portions 17 and the first curved face portions 18.

[0042] It should be noted that, regardless of whether the structure of the first sidewall portion 6 adopts a straight surface, an arc surface, or a combination of both, the entire first sidewall portion 6 has a basically smooth transition shape and there will be no excessive abrupt changes. The illustration is only for better understanding of the technical solution of the present invention and is not intended to limit the present application.

[0043] As one implementation method, the permanent magnets of this device can be symmetrically or asymmetrically distributed on both sides. As long as the concept of the bottom opening width being smaller than the middle opening width and the outer opening width being smaller than the middle opening width is adopted, it is within the scope of protection of this application.

[0044] As one implementation method, refer to Figures 10-12 Define the width of the magnetic conductor 2 on the side closest to the axis of the iron core body 1 in the circumferential direction as W11, where W11≤3mm; and / or define the central angle of the magnetic conductor 2 on the side furthest from the axis of the iron core body 1 in the circumferential direction as A12, and define the central angle of the centerline of the adjacent magnetic steel groove 3 as A2, where 0.55<A12 / A2<0.85; and / or define the bottom opening 13 as M1, the middle opening 14 as M2, and the outer opening 15 as M3, where 1.1<M2 / M1<3, 1.1<M2 / M3<3;

[0045] Choosing a reasonable value for A12 / A2 yields a better pole arc coefficient, ensuring the sinusoidal waveform of the air gap magnetic flux density. The symmetrical arrangement of the magnet slots 3 along the circumference ensures the symmetry of the air gap magnetic flux density, preventing increased vibration noise due to distortion. Furthermore, selecting a larger M2 effectively increases the internal magnetic reluctance of the permanent magnet, thereby increasing the magnetic flux in the air gap. Simultaneously, a smaller M1 provides more space for the permanent magnet in the radial direction, effectively increasing its area perpendicular to the magnetic field lines, thus further increasing the magnetic flux in the air gap.

[0046] Using the above dimensions can better reduce magnetic leakage and make the magnetic field lines more evenly distributed, thus improving the quality of the motor.

[0047] As an implementation method reference Figure 5 or Figure 6The magnetic conductor 2 of this device can also be provided with a limiting protrusion 7 outside the outer opening 15. This implementation method is an optional solution. If the limiting protrusion 7 is too large, it will lead to an increase in magnetic leakage. If the limiting protrusion 7 is too small, it will lead to an increase in air gap magnetic flux distortion. The setting of this limiting protrusion 7 can adjust the magnitude of magnetic leakage and the magnitude of air gap magnetic flux distortion to an appropriate range. This method can improve the quality of the motor and make the permanent magnet more stable.

[0048] In one implementation, the magnetic conductor 2 has a through hole 5.

[0049] In one implementation, M1 = M3, or M1 > M3, or M1 < M3.

[0050] An electric motor rotor includes a plurality of permanent magnets 4 and a rotor core, wherein the plurality of permanent magnets 4 are arranged one-to-one in corresponding magnetic slots 3.

[0051] The motor rotor using the rotor core described above in this invention can make the magnetic field lines of the entire motor more uniformly distributed, which is beneficial to improving the torque output of the motor and reducing the vibration noise caused by magnetic field distortion, thereby improving the overall operating performance of the motor.

[0052] As one implementation method, such as Figures 3-6 As shown, the motor rotor adopts a cylinderless design, and the magnetic conductor and permanent magnet are fixed by means of a mold using thermosetting or thermoplastic materials.

[0053] As one implementation method, refer to Figure 9 The rotor core includes a cylinder 8, and at least part of the magnetic conductor 2 is assembled and connected to the cylinder 8 or integrally formed; the magnetic conductor and the inner core can be fully connected, partially connected or not connected at all, and the magnetic conductor and the permanent magnet are fixed by means of a mold using thermosetting or thermoplastic materials.

[0054] As one implementation method, refer to Figure 7 The rotor core includes a cylinder 8, and there is a gap 16 between the root of the magnetic conductor 2 and the outer peripheral wall of the cylinder 8. The magnetic conductor and the permanent magnet are fixed by means of a mold using thermosetting or thermoplastic materials.

[0055] In one embodiment, the permanent magnet 4 includes a symmetrically arranged second sidewall portion 11, which is attached to the first sidewall portion 6 of the magnetic conductor 2. The permanent magnet 4 adopts a symmetrical design, which can ensure the symmetry of the air gap magnetic flux density and avoid the increase of vibration noise caused by the distortion of the air gap magnetic flux density.

[0056] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technical solution, concept, or design obtained by those skilled in the art by making equivalent substitutions or changes to the technical solution and inventive concept of the present invention within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention.

Claims

1. A rotor core, comprising a core body (1), wherein the core body (1) includes a plurality of magnetic conductors (2) arranged in a ring and spaced apart, and a magnetic groove (3) is formed between the first sidewall portions (6) of adjacent magnetic conductors (2), characterized in that, Along the radial direction of the iron core body (1) from the inside to the outside, the magnetic steel groove (3) includes a bottom opening (13), a middle opening (14), and an outer opening (15). The width of the bottom opening (13) is smaller than the width of the middle opening (14), and the width of the outer opening (15) is smaller than the width of the middle opening (14).

2. A rotor core according to claim 1, characterized in that, The first sidewall portion (6) has an arc-shaped surface structure.

3. A rotor core according to claim 1, characterized in that, The first sidewall portion (6) has a multi-segment structure.

4. A rotor core according to claim 1, characterized in that, The first sidewall portion (6) includes a plurality of second straight sections (21) and a plurality of third straight sections (22). Alternatively, the first sidewall portion (6) may include a plurality of second arcuate portions (19) and a plurality of third arcuate portions (20).

5. A rotor core according to claim 1, characterized in that, The first sidewall portion (6) includes a plurality of first straight face portions (17) and a plurality of first arc face portions (18).

6. A rotor core according to any one of claims 1-5, characterized in that, Define the width of the magnetic conductor (2) on the side near the axis of the iron core body (1) in the circumferential direction as W11, where W11≤3mm; And / or, define the central angle of the magnetic conductor (2) on the side away from the axis of the iron core (1) in the circumferential direction as A12, and define the central angle of the center line of the adjacent magnetic slot (3) as A2, where 0.55 < A12 / A2 < 0.85; And / or, define the bottom opening (13) size as M1, the middle opening (14) size as M2, and the outer opening (15) size as M3, where 1.1 < M2 / M1 < 3, 1.1 < M2 / M3 < 3; And / or, the magnetic conductor (2) is provided with a limiting protrusion (7) on the outside of the outer opening (15); And / or, the magnetic conductor (2) has a through hole (5).

7. A rotor core according to claim 6, characterized in that, The condition is that M1 = M3, or M1 > M3, or M1 < M3.

8. A rotor core according to any one of claims 1-5 and 7, characterized in that, The rotor core includes a cylindrical body (8), and at least part of the magnetic conductor (2) is assembled and connected to the cylindrical body (8) or integrally formed; Alternatively, the rotor core may include a cylinder (8) with a gap (16) between the root of the magnetic conductor (2) and the outer peripheral wall of the cylinder (8).

9. A motor rotor, characterized in that, It includes a plurality of permanent magnets (4) and a rotor core as described in any one of claims 1-8, wherein the plurality of permanent magnets (4) are arranged one-to-one in the corresponding magnetic steel slots (3).

10. A motor rotor according to claim 9, characterized in that, The permanent magnet (4) includes a symmetrically arranged second sidewall portion (11), which is attached to the first sidewall portion (6) of the magnetic conductor (2); And / or, the rotor core is encapsulated together with the permanent magnet (4).

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