Motor rotor and DC motor

Abstract

The present invention provides a motor rotor and a DC motor, comprising: a magnetic disk (1), wherein the magnetic disk (1) is magnetized along the axial direction; and a magnetic conductive structure (2), wherein the magnetic conductive structure (2) is arranged at both ends of the magnetic disk (1), and the magnetic conductive structure (2) is used to guide the axial magnetic field of the magnetic disk (1) to the radial direction of the magnetic disk (1). The motor rotor of the present invention adopts a permanent magnet in combination with a magnetic conductive structure to guide the axial magnetic field generated by the permanent magnet to a radial magnetic field, and the radial magnetic field is coupled with the radial magnetic field of the motor stator, so as to improve the magnetic field utilization efficiency of the rotor and improve the power density of the motor. The permanent magnet and the magnetic conductive structure are positioned and installed by a positioning structure, and the positioning unit and the magnetic conductive structure are both modularized and unitized in design, with low manufacturing cost and simple and efficient assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a motor rotor, a DC motor and an electrical appliance. Background Art

[0002] DC motors have been widely used due to their features of stepless speed regulation, quietness and high efficiency. With the gradual conversion of products in the fields of household appliances to DC, the market prospects for DC fans are extremely promising.

[0003] Currently, mainstream DC motors are relatively similar in structure, technical characteristics, and manufacturing materials, but generally have the problem of low motor power density. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is that the power density of the existing DC motor is low, and thus a motor rotor, a DC motor and an electrical appliance are provided.

[0005] In order to solve the above problems, the present invention provides a motor rotor, comprising:

[0006] Disk; Disks are magnetized along the axis direction;

[0007] The magnetic conductive structure is respectively arranged at both ends of the magnetic disk, and is used to guide the axial magnetic field of the magnetic disk to the radial direction along the magnetic disk.

[0008] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0009] Preferably, at least two disks are coaxially arranged, and the polarities of the relative magnetic poles of adjacent disks are the same;

[0010] Preferably, the motor rotor further comprises a positioning structure, and the positioning structure is used to position at least two magnetic disks and the magnetic conductive structure.

[0011] Preferably, the positioning structure comprises at least two positioning units, the at least two positioning units are coaxially arranged, and the at least two positioning units are used to position at least two magnetic disks and the magnetic conductive structure.

[0012] Preferably, both ends of each of the at least two positioning units along the axial direction are provided with circumferential positioning structures, and the circumferential positioning structures are used for circumferential positioning of the at least two positioning units.

[0013] Preferably, the circumferential positioning structure includes a positioning column and a positioning hole. The positioning column is arranged at one end of the positioning unit along the axial direction, and the positioning hole is arranged at the other end of the positioning unit along the axial direction. Adjacent positioning units complete circumferential positioning through the cooperation of the positioning column and the positioning hole.

[0014] Preferably, the positioning unit includes a disk positioning portion, a first magnetic conductive structure positioning portion, and a second magnetic conductive structure positioning portion. The first magnetic conductive structure positioning portion is arranged at one end of the disk positioning portion along the axial direction, and the second magnetic conductive structure positioning portion is arranged at the other end of the disk positioning portion along the axial direction.

[0015] Preferably, the first magnetic conductive structure positioning portion is provided with a first positioning groove for circumferential positioning of the magnetic conductive structure, and / or the second magnetic conductive structure positioning portion is provided with a second positioning groove for circumferential positioning of the magnetic conductive structure.

[0016] Preferably, the positioning column and the positioning hole are staggered along the axis of the positioning unit, and the central angle between the positioning column and the positioning hole is α. The first positioning slot and the second positioning slot are staggered along the axis of the positioning unit, and the central angle between the first positioning slot and the second positioning slot is β, wherein α=β.

[0017] Preferably, the magnetic conductive structure comprises a first magnetic conductive structure and a second magnetic conductive structure, and the first magnetic conductive structure and the second magnetic conductive structure guide the magnetic field of the magnetic disk in a radial direction of the magnetic disk.

[0018] Preferably, the centers of the first magnetic conductive structure and the second magnetic conductive structure are both provided with mounting holes along the axial direction, and the inner walls of the mounting holes are provided with positioning protrusions, which cooperate with the first positioning slot to circumferentially position the first magnetic conductive structure, and the positioning protrusions cooperate with the second positioning slot to circumferentially position the second magnetic conductive structure.

[0019] A direct current motor adopts the motor rotor mentioned above.

[0020] Preferably, it includes:

[0021] stator core;

[0022] The stator core is provided with a pole shoe, and the length of the pole shoe along the axial direction of the stator core is greater than the thickness of the stator core along the axial direction.

[0023] Preferably, the pole shoe is mounted on the stator core through a slot structure, the slot structure includes a protrusion and a groove, the width of the protrusion is L, the width of the groove at one end along the axis of the stator core is L1, and the width of the groove at the other end along the axis of the stator core is L2, wherein L1>L>L2.

[0024] Preferably, the stator core is a chain-type stator core, on which a stator winding is provided, and the stator winding can form a radial magnetic field.

[0025] The motor rotor and DC motor provided by the present invention have at least the following beneficial effects:

[0026] The motor rotor and the DC motor of the present invention adopt a permanent magnet and a magnetic conductive structure to guide the axial magnetic field generated by the permanent magnet into a radial magnetic field. The radial magnetic field is coupled with the radial magnetic field of the motor stator, which can improve the magnetic field utilization efficiency of the rotor and improve the power density of the motor. The permanent magnet and the magnetic conductive structure are positioned and installed by the positioning structure. The positioning unit and the magnetic conductive structure are both modularized and unitized, with low manufacturing cost and simple and efficient assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional schematic diagram of a motor rotor according to an embodiment of the present invention;

[0028] Figure 2 is an overall structural diagram of a motor rotor according to an embodiment of the present invention;

[0029] Figure 3 is a cross-sectional schematic diagram of a positioning unit according to an embodiment of the present invention;

[0030] Figure 4 is an overall structural diagram of a positioning unit according to an embodiment of the present invention;

[0031] Figure 5 is an axial perspective view of a positioning unit according to an embodiment of the present invention;

[0032] Figure 6 is a schematic structural diagram of a first magnetic conductive structure according to an embodiment of the present invention;

[0033] Figure 7 is a structural schematic diagram of a DC motor according to an embodiment of the present invention;

[0034] Figure 8 Schematic diagram of the structure of the stator core of an embodiment of the present invention;

[0035] Fig. 9 Schematic diagram of the structure of the pole shoe according to an embodiment of the present invention.

[0036] The reference numerals are as follows:

[0037] 1. Disk; 2. Magnetic conductive structure; 3. Positioning structure; 4. Positioning unit; 5. Circumferential positioning structure; 6. Disk positioning part; 7. First magnetic conductive structure positioning part; 8. Second magnetic conductive structure positioning part; 9. First positioning slot; 10. Second positioning slot; 11. First magnetic conductive structure; 12. Second magnetic conductive structure; 13. Mounting hole; 14. Positioning protrusion; 15. Stator core; 16. Pole shoe; 17. Protrusion; 18. Groove; 19. Stator winding; 20. Disc yoke; 21. Wedge yoke; 22. Positioning column; 23. Positioning hole; 24. Casing; 25. Motor shaft. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] See also Figures 1 to 6 As shown, a motor rotor includes: a magnetic disk 1; the magnetic disk 1 is magnetized along the axial direction; a magnetic conductive structure 2, which is arranged at both ends of the magnetic disk 1 and is used to guide the axial magnetic field of the magnetic disk 1 to the radial direction of the magnetic disk 1.

[0040] The motor rotor provided in this embodiment uses a magnetic disk made of permanent magnetic material to form an axial magnetic field, and then guides the axial magnetic field to a radial magnetic field through a magnetic conductive structure. The radial magnetic field of the rotor is coupled with the radial magnetic field formed by the stator winding, which can improve the magnetic field utilization efficiency of the rotor and improve the power density of the motor; the utilization rate of the magnetic material is high. Under the same magnetic field strength requirement, the motor rotor of this embodiment can use less magnetic material, which is beneficial to reducing the production cost of the electronic rotor.

[0041] In this embodiment, the disk 1 can be a circular ring magnet made of ferrite material. There are at least two disks 1. Under the condition of the same disk volume, the magnetic field strength formed by splitting into two disks will be greater than the magnetic field strength formed by a single disk. At least two disks 1 are coaxially arranged, and the polarity of the relative magnetic poles of adjacent disks 1 is the same. The disk is axially magnetized, one side is an N pole and the other side is an S pole. The S poles of the two disks are arranged opposite to each other. The polarity of adjacent disks is the same. The magnetic lines of force of the two can only go to the magnetic conductive structure and form a radial magnetic field under the guidance of the magnetic conductive structure. There is no leakage magnetic problem in the rotor itself.

[0042] In this embodiment, the motor rotor also includes a positioning structure 3, which is used to position at least two magnetic disks 1 and the magnetic conductive structure 2. The inner diameters of the magnetic disks 1 and the magnetic conductive structure 2 are the same as the outer diameter of the positioning structure 3. The magnetic disks 1 and the magnetic conductive structure 2 are both mounted on the outside of the positioning structure 3, and are axially and radially positioned by the positioning structure 3. An axial hole for mounting the motor shaft is provided at the axis of the positioning structure 3, so that the motor rotor can be mounted on the motor shaft.

[0043] In this embodiment, the positioning structure 3 includes at least two positioning units 4, at least two positioning units 4 are coaxially connected to form a complete positioning structure 3, and at least two positioning units 4 are used together to position at least two magnetic disks 1 and the magnetic conductive structure 2. The positioning structure 3 is composed of modular positioning units 4, and each positioning unit 4 corresponds to positioning a magnetic disk 1 and the magnetic conductive structure 2 configured for the magnetic disk 1. By aligning and connecting multiple positioning units 4, the magnetic disk 1 and its magnetic conductive structure 2 can be conveniently assembled axially to form a motor rotor.

[0044] In this embodiment, when the motor rotor includes two or more magnetic disks 1, the two magnetic conductive structures 2 between every two magnetic disks 1 can be integrated, that is, a bidirectional magnetic conductive structure, which has a wedge-shaped magnetic yoke 21 extending to the two magnetic disks 1 at the same time. The bidirectional magnetic conductive structure can conduct magnetism to the magnetic conductive structures 2 on the outside of the two magnetic disks 1.

[0045] And / or, when the positioning structure 3 includes two or more positioning units 4, the two positioning units can be integrated, that is, one has two or more positioning areas, each positioning area can position the magnetic disk 1 and the magnetic conductive structure 2 equipped therewith.

[0046] In this embodiment, both ends of each positioning unit 4 in the at least two positioning units 4 along the axial direction are provided with a circumferential positioning structure 5, and the circumferential positioning structure 5 is used for circumferential positioning between at least two positioning units 4 to prevent the adjacent positioning units 4 from rotating relative to each other. The circumferential positioning structure 5 includes a positioning column 22 and a positioning hole 23, wherein the positioning column 22 is arranged at one end of the positioning unit 4 along the axial direction, and the positioning hole 23 is arranged at the other end of the positioning unit 4 along the axial direction. When the axes of the multiple positioning units 4 overlap and are connected, the adjacent positioning units 4 complete the circumferential positioning through the cooperation of the positioning column 22 and the positioning hole 23, so that the two adjacent positioning units 4 cannot rotate relative to each other.

[0047] In this embodiment, in order to guide the axial magnetic field of the disk 1 to a radial magnetic field, the magnetic conductive structure 2 includes a first magnetic conductive structure 11 and a second magnetic conductive structure 12. The first magnetic conductive structure 11 and the second magnetic conductive structure 12 can be used to guide the magnetic field of the disk 1 in the radial direction of the disk.

[0048] The first magnetic conductive structure 11 and the second magnetic conductive structure 12 have the same structure, both including a disk-shaped magnetic yoke 20, the edge of which is provided with a wedge-shaped magnetic yoke 21, the disk-shaped magnetic yoke 20 matches the first magnetic pole of the magnetic disk 1, and the wedge-shaped magnetic yoke 21 extends along the outer cylindrical surface of the magnetic disk 1 toward the second magnetic pole of the magnetic disk 1. The first magnetic conductive structure 11 and the second magnetic conductive structure 12 are oppositely buckled on the two sides of the magnetic disk 1, the wedge-shaped magnetic yokes 21 are staggered, and the adjacent wedge-shaped magnetic yokes 21 have different polarities, so that a magnetic field is formed between the adjacent wedge-shaped magnetic yokes, and the magnetic field at this time is a radial magnetic field along the radial direction of the motor rotor.

[0049] In this embodiment, in order to realize the positioning of the magnetic disk 1 and the first magnetic conductive structure 11 and the second magnetic conductive structure 12 arranged on both sides of the magnetic disk 1 by the positioning unit 4, the positioning unit 4 includes a magnetic disk positioning portion 6, a first magnetic conductive structure positioning portion 7, and a second magnetic conductive structure positioning portion 8. The first magnetic conductive structure positioning portion 7 is arranged at one end of the magnetic disk positioning portion 6 along the axial direction, and the second magnetic conductive structure positioning portion 8 is arranged at the other end of the magnetic disk positioning portion 6 along the axial direction, wherein the magnetic disk positioning portion 6 is used to install and position the magnetic disk 1, the first magnetic conductive structure positioning portion 7 is used to install and position the first magnetic conductive structure 11, and the second magnetic conductive structure positioning portion 8 is used to install and position the second magnetic conductive structure 12. In this embodiment, "first" and "second" are not specific, but are only for the convenience of description. For example, the first magnetic conductive structure 11 and the second magnetic conductive structure 12 are of the same structure, and the first magnetic conductive structure positioning portion 7 and the second magnetic conductive structure positioning portion 8 are also of the same structure. The markings in the drawings cannot be considered as specific references to the above structures. Similarly, the first magnetic conductive structure positioning portion 7 can be completely used to install and position the second magnetic conductive structure 12 , and the second magnetic conductive structure positioning portion 8 can also be used to install and position the first magnetic conductive structure 11 .

[0050] In this embodiment, in order to ensure that the first magnetic conductive structure 11 or the second magnetic conductive structure 12 does not rotate relative to each other after being installed in the positioning unit 4, a first positioning slot 9 for circumferential positioning of the magnetic conductive structure 2 is provided on the first magnetic conductive structure positioning portion 7, and / or a second positioning slot 10 for circumferential positioning of the magnetic conductive structure 2 is provided on the second magnetic conductive structure positioning portion 8.

[0051] In this embodiment, the positioning column 22 and the positioning hole 23 are staggered along the axis of the positioning unit 4, and the central angle between the positioning column 22 and the positioning hole 23 is α. The first positioning slot 9 and the second positioning slot 10 are staggered along the axis of the positioning unit 4, and the central angle between the first positioning slot 9 and the second positioning slot 10 is β, where α=β. The positioning slot on the positioning unit 4 is used to install the magnetic conductive structure 2, specifically the disc-shaped magnetic yoke 20 for positioning and installing the first magnetic conductive structure 11. The first positioning slot 9 and the second positioning slot 10 are staggered, so that when the first magnetic conductive structure 11 and the second magnetic conductive structure 12 of the same structure are installed at both ends of a positioning unit 4 at the same time, the wedge-shaped magnetic yoke 21 naturally rotates staggered to form crossed claw-shaped magnetic poles. When producing the motor rotor of the present invention, only one structure of the magnetic conductive structure 2 needs to be designed, and modular and unitized design is applied to the magnetic conductive structure 2, which further reduces the design cost and processing and manufacturing cost of the motor rotor.

[0052] In this embodiment, the central angle α of the positioning column 22 and the positioning hole 23 is set to be the same as the central angle β of the first positioning slot 9 and the second positioning slot 10. Figure 5In the axial perspective view of the positioning unit 4 shown, the positioning column 22 and the first positioning slot 9 are located on the end surface of the positioning unit 4 along the outward side of the paper, and the positioning hole 23 and the second positioning slot 10 are located on the end surface of the positioning unit 4 along the inward side of the paper. In the axial projection, the positions of the positioning column 22 and the second positioning slot 10 are unified, and the positions of the positioning hole 23 and the first positioning slot 9 are unified. With such a structure, when the two positioning units 4 are axially connected, the two positioning units 4 must be circumferentially staggered at an angle α so that the positioning column 22 of the second positioning unit 4 can be inserted into the positioning hole 23 of the first positioning unit 4. At this time, because the rotation angle α=β, the first positioning slot 9 of the second positioning unit 4 is in the same position as the second positioning slot 10 of the first positioning unit 4. When the two positioning units 4 are both installed with the magnetic conductive structure 2, the magnetic conductive structure 2 fixed to the second positioning unit 4 has the same circumferential shape as the magnetic conductive structure 2 fixed to the first positioning unit 4, that is, the axis of the wedge-shaped magnetic yoke 21 coincides, as shown in FIG. Figure 2 As shown, it means that the magnetic poles in the middle of the motor rotor are unified, and the path of the magnetic flux lines is unified, which can further improve the utilization efficiency of the magnetic field in the motor rotor and reduce leakage magnetic field.

[0053] In this embodiment, the centers of the first magnetic conductive structure 11 and the second magnetic conductive structure 12 are both provided with mounting holes 13 along the axial direction, and the inner walls of the mounting holes 13 are provided with positioning protrusions 14. When the positioning protrusions 14 cooperate with the first positioning slots 9, the first magnetic conductive structure 11 is circumferentially positioned; when the positioning protrusions 14 cooperate with the second positioning slots 10, the second magnetic conductive structure 12 is circumferentially positioned.

[0054] The motor rotor of the embodiment of the present invention adopts a permanent magnet in combination with a magnetic conductive structure to guide the axial magnetic field generated by the permanent magnet into a radial magnetic field. The radial magnetic field is coupled with the radial magnetic field of the motor stator, which can improve the magnetic field utilization efficiency of the rotor and improve the power density of the motor. The permanent magnet and the magnetic conductive structure are positioned and installed by the positioning structure. The positioning unit and the magnetic conductive structure are both modularized and unitized, with low manufacturing cost and simple and efficient assembly.

[0055] Combination Figures 7 to 9 As shown, the present invention provides a DC motor, which adopts the above-mentioned motor rotor.

[0056] In this embodiment, the DC motor includes: a stator core 15, which is installed in a housing 24; a pole shoe 16 is provided on the stator core 15, and the length of the pole shoe 16 along the axial direction of the stator core 15 is greater than the thickness of the stator core 15 along the axial direction, and the motor stator is installed in the stator core 15 through the motor shaft 25.

[0057] In this embodiment, the length of the pole shoe 16 is greater than the stacking thickness of the stator core 15. The pole shoe 16 that leaks out of the stator core 15 at both ends can also form a stator magnetic field, so that when the motor forms the same volume magnetic field, the stacking thickness of the stator core 15 needs to be smaller, reducing the cost of the core material.

[0058] In this embodiment, the pole shoe 16 is installed on the stator core 15 through a slot structure, and the slot structure includes a protrusion 17 and a groove 18. The width of the protrusion 17 is L, the width of the groove 18 at one end along the axis of the stator core 15 is L1, and the width of the groove 18 at the other end along the axis of the stator core 15 is L2, where L1>L>L2. The width of the groove 18 is a transition structure from large to small, wherein the width of one end face is L1, which is greater than the width L of the protrusion 17, and the width of the other end face of the groove 18 is L2, which is less than the width L of the protrusion 17; thus, when the groove 18 is inserted into the protrusion 17 from the L1 end face, it is a clearance fit, and when the groove 18 gradually goes down, it becomes an interference fit, and the purpose of fixing the groove 18 and the protrusion 17 is achieved. In this embodiment, the stator core 15 is provided with a protrusion 17 and the pole shoe 16 is provided with a groove 18, which can also be interchangeable. The stator core 15 is provided with a groove 18 and the pole shoe 16 is provided with a protrusion 17, both of which can achieve the fixation of the stator core 15 and the pole shoe 16.

[0059] In this embodiment, the stator core 15 is a chain-type stator core. The stator core 15 is provided with a stator winding 19 . The stator winding 19 can form a radial magnetic field.

[0060] In this embodiment, the motor rotor of the DC motor adopts a permanent magnet with a magnetic conductive structure to guide the axial magnetic field generated by the permanent magnet to a radial magnetic field. The motor stator adopts a winding to generate a radial magnetic field. The radial magnetic field of the rotor is coupled with the radial magnetic field of the motor stator, which can improve the magnetic field utilization efficiency of the rotor and improve the power density of the motor. The pole shoe length is greater than the stacking thickness of the stator core, so that the stator core stacking thickness is smaller when the motor forms the same volume magnetic field, reducing the cost of the core material.

[0061] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A motor rotor, characterized in that: include: A magnetic disk (1), wherein the magnetic disk (1) is magnetized along an axial direction; A magnetic conductive structure (2), the magnetic conductive structure (2) being arranged at two ends of the magnetic disk (1), the magnetic conductive structure (2) being used to guide the axial magnetic field of the magnetic disk (1) in a radial direction along the magnetic disk (1); There are at least two magnetic disks (1); the at least two magnetic disks (1) are coaxially arranged, and the polarities of the relative magnetic poles of adjacent magnetic disks (1) are the same; the motor rotor further comprises a positioning structure (3), the positioning structure (3) being used to position the at least two magnetic disks (1) and the magnetic conductive structure (2); The positioning structure (3) comprises at least two positioning units (4), the at least two positioning units (4) are coaxially arranged, and the at least two positioning units (4) are used to position the at least two magnetic disks (1) and the magnetic conductive structure (2); Each of the at least two positioning units (4) is provided with circumferential positioning structures (5) at both ends along the axial direction, and the circumferential positioning structures (5) are used for circumferential positioning of the at least two positioning units (4).

2. The motor rotor according to claim 1, characterized in that: The circumferential positioning structure (5) comprises a positioning column (22) and a positioning hole (23); the positioning column (22) is arranged at one end of the positioning unit (4) along the axial direction; the positioning hole (23) is arranged at the other end of the positioning unit (4) along the axial direction; adjacent positioning units (4) are circumferentially positioned by the cooperation of the positioning column (22) and the positioning hole (23).

3. The motor rotor according to claim 1 or 2, characterized in that: The positioning unit (4) comprises a disk positioning portion (6), a first magnetic conductive structure positioning portion (7), and a second magnetic conductive structure positioning portion (8); the first magnetic conductive structure positioning portion (7) is arranged at one end of the disk positioning portion (6) along the axial direction, and the second magnetic conductive structure positioning portion (8) is arranged at the other end of the disk positioning portion (6) along the axial direction.

4. The motor rotor according to claim 3, characterized in that: The first magnetic conductive structure positioning portion (7) is provided with a first positioning slot (9) for circumferentially positioning the magnetic conductive structure (2), and / or the second magnetic conductive structure positioning portion (8) is provided with a second positioning slot (10) for circumferentially positioning the magnetic conductive structure (2).

5. The motor rotor according to claim 4, characterized in that: The positioning posts (22) and the positioning holes (23) are arranged alternately along the axis of the positioning unit (4), and the central angle between the positioning posts (22) and the positioning holes (23) is α; the first positioning slots (9) and the second positioning slots (10) are arranged alternately along the axis of the positioning unit (4), and the central angle between the first positioning slots (9) and the second positioning slots (10) is β, wherein α=β.

6. The motor rotor according to any one of claims 1-2, 4-5, characterized in that: The magnetic conductive structure (2) comprises a first magnetic conductive structure (11) and a second magnetic conductive structure (12), wherein the first magnetic conductive structure (11) and the second magnetic conductive structure (12) guide the magnetic field of the magnetic disk (1) in a radial direction along the magnetic disk (1).

7. The motor rotor according to claim 6, characterized in that: The centers of the first magnetic conductive structure (11) and the second magnetic conductive structure (12) are both provided with mounting holes (13) along the axial direction, and the inner walls of the mounting holes (13) are provided with positioning protrusions (14), the positioning protrusions (14) cooperate with the first positioning slots (9) to perform circumferential positioning of the first magnetic conductive structure (11), and the positioning protrusions (14) cooperate with the second positioning slots (10) to perform circumferential positioning of the second magnetic conductive structure (12).

8. A DC motor, characterized in that: A motor rotor as described in any one of claims 1 to 7 is adopted.

9. The DC motor according to claim 8, characterized in that: include: stator core (15); A pole shoe (16) is provided on the stator iron core (15), and the length of the pole shoe (16) along the axial direction of the stator iron core (15) is greater than the thickness of the stator iron core (15) along the axial direction.

10. The DC motor according to claim 9, characterized in that: The pole shoe (16) is mounted on the stator core (15) via a slot structure, the slot structure comprising a protrusion (17) and a groove (18), the protrusion (17) having a width of L, the groove (18) having a width at one end along the axial direction of the stator core (15) having a width of L1, and the groove (18) having a width at the other end along the axial direction of the stator core (15) having a width of L2, wherein L1>L>L2.

11. The DC motor according to claim 9 or 10, characterized in that: The stator core (15) is a chain-type stator core (15), and a stator winding (19) is provided on the stator core (15), and the stator winding (19) is capable of forming a radial magnetic field.

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