A slotted disc permanent magnet eddy current coupling

Abstract

The invention discloses a novel slotted disc type permanent magnetic eddy current coupling, which comprises an active disc, an active shaft, a driven disc and a driven shaft, wherein the active disc comprises a back iron disc I and a magnetic ring, the driven disc comprises an eddy current combination disc and a back iron disc II, the eddy current combination disc comprises an eddy current disc body, a plurality of left iron blocks and a plurality of right iron blocks, the left and right end faces of the eddy current disc body are both provided with rectangular grooves or fan-shaped grooves in an annular array, and the number of grooves on the left and right end faces is equal, the grooves on the left and right end faces are arranged alternately along the circumferential direction of the eddy current disc body, any groove on the left end face and any groove on the right end face do not overlap in the circumferential direction of the eddy current disc body, each groove on the left end face of the eddy current disc body is provided with a left iron block, and each groove on the right end face of the eddy current disc body is provided with a right iron block. The slotted disc type permanent magnetic eddy current coupling of the invention can effectively improve the transmission torque of the coupling while greatly reducing the fluctuation of the torque.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet eddy current transmission, and in particular to a disc type permanent magnet eddy current coupling. Background Art

[0002] The basic principle of permanent magnet eddy current coupling is: when the permanent magnet rotor and the conductor rotor make relative rotational motion, the permanent magnets with alternating magnetic pole directions on the permanent magnet rotor will generate an alternating magnetic field in the eddy current ring made of conductive material in the conductor rotor, and then induce alternating eddy currents therein, which in turn generate an induced magnetic field in the eddy current ring. The induced magnetic field interacts with the magnetic field on the permanent magnet rotor to generate a coupling torque between the two rotors, thereby achieving the purpose of transmitting motion and torque.

[0003] The structural forms of permanent magnet eddy current transmission devices currently mainly include sleeve type and flat disc type, and their application areas mainly include permanent magnet eddy current couplings (transmissions) and permanent magnet eddy current speed regulators.

[0004] In the existing flat disc permanent magnet eddy current coupling, the conductor rotor usually adopts two structural schemes: one is that the conductor disc adopts an overall smooth annular disc, and the conductor disc is fixed to the conductor back iron disc; the other is that the conductor disc adopts a spoke-shaped slotted structure, the slots penetrate the conductor disc, and the conductor disc is fixed on the conductor back iron disc with a smooth surface or a protrusion, the protrusion of the conductor back iron disc with a protrusion is consistent with the shape of the spoke-shaped conductor disc slot, and the conductor back iron disc is cast as a whole with electrical pure iron. The disadvantage of the first structural scheme is that the ineffective eddy current in the conductor area that does not contribute to the generation of torque has a large specific gravity, thereby increasing the redundant eddy current loss. Since the eddy current loss is the main power loss of the permanent magnet eddy current transmission device, the utilization efficiency of the magnetic material is reduced; at the same time, the redundant eddy current loss is finally converted into heat energy, which increases the heat dissipation burden of the equipment. The disadvantage of the second structural scheme is that the copper conductor disc of the disc permanent magnet eddy current coupling is slotted, and the slotted space is filled with magnetic conductive material. Although this can improve the transmission torque of the device, it will greatly increase the torque fluctuation at the same time, limiting its application in some occasions requiring precise torque control. Summary of the invention

[0005] The problem to be solved by the present invention is to provide a slotted disc permanent magnet eddy current coupling, which effectively improves the transmission torque of the coupling and greatly reduces the torque fluctuation. At the same time, the ineffective eddy current in the conductor area of ​​the coupling is greatly reduced, the utilization efficiency of the magnetic material is improved, and the heat dissipation burden of the equipment is reduced.

[0006] The present invention discloses a slotted disc type permanent magnet eddy current coupling, which comprises a driving disc, a driving shaft, a driven disc and a driven shaft, wherein the driving disc is coaxially arranged with the driving shaft and the two are connected, the driven disc is coaxially arranged with the driven shaft and the two are connected, the driving disc and the driven disc are coaxially arranged, the driving disc comprises a back iron disc I and a magnetic ring, the back iron disc I and the magnetic ring are coaxially arranged, the magnetic ring is fixed on the inner surface of the back iron disc I opposite to the driven disc, and the back iron disc I and the driving shaft are connected through a connecting column I; the driven disc comprises an eddy current combination disc and a back iron disc II, the eddy current combination disc and the back iron disc II are coaxially arranged, the eddy current combination disc and the magnetic ring are arranged opposite to each other, the eddy current combination disc and the back iron disc II are fastened together The eddy current combination disk, the back iron disk II and the driven shaft are connected by a connecting column II; the eddy current combination disk includes an eddy current disk body, a plurality of left iron blocks, and a plurality of right iron blocks. Rectangular grooves or fan-shaped grooves in an annular array are distributed on the left and right end surfaces of the eddy current disk body, and the number of grooves on the left and right end surfaces is equal. The grooves on the left and right end surfaces are staggered along the circumferential direction of the eddy current disk body. The positions of any groove on the left end surface and any groove on the right end surface in the circumferential direction of the eddy current disk body do not overlap. A left iron block is arranged in each groove on the left end surface of the eddy current disk body, and a right iron block is arranged in each groove on the right end surface of the eddy current disk body.

[0007] Furthermore, all the grooves on the left end face of the eddy current disk body have the same shape and size, the depth of the grooves is less than the thickness of the eddy current disk body, and the shape and size of the left iron block are the same as those of the grooves on the left end face of the eddy current disk body.

[0008] Furthermore, all the grooves on the right end face of the eddy current disk body have the same shape and size, the depth of the grooves is less than the thickness of the eddy current disk body, and the shape and size of the right iron block are the same as those of the grooves on the right end face of the eddy current disk body.

[0009] Furthermore, the eddy current disk body material is a conductive material, preferably a copper disk.

[0010] Furthermore, the magnetic ring is formed into a ring shape by a plurality of mixed magnetic poles, each mixed magnetic pole is a fan-shaped ring structure with the same shape and size, the direction of the combined magnetic field of each mixed magnetic pole is along the axial direction of the active disk, and the directions of the combined magnetic fields of adjacent mixed magnetic poles are opposite.

[0011] Furthermore, each hybrid magnetic pole includes a magnetic block and a magnetic focusing unit symmetrically arranged on the left and right sides of the magnetic block; the magnetic block and the magnetic focusing unit are both fan-shaped structures, the magnetic focusing unit and the magnetic block have the same thickness along the axial direction of the active disk, and the magnetic focusing unit and the magnetic block have the same size along the radial direction of the active disk.

[0012] Furthermore, each magnetic focusing unit includes a magnetic adjustment block and a small magnetic block; the magnetic adjustment block is made of non-ferromagnetic material, the small magnetic block is made of permanent magnetic material, and the magnetic block is made of permanent magnetic material; in the same hybrid magnetic stage: the magnetic block is magnetized along the axial direction of the active disk, and the angle range between the magnetization direction of the small magnetic blocks on the left and right sides and the magnetization direction of the magnetic block is 30°~90°.

[0013] Furthermore, the magnetic adjustment block and the small magnetic block in each magnetic focusing unit are arranged along the thickness direction of the magnetic circle, the magnetic adjustment block and the small magnetic block are fixedly connected, and the outer end surface of the magnetic adjustment block is fixedly connected to the back iron disk I.

[0014] Furthermore, the magnetic adjustment block is in a sector ring shape, the small magnetic block is in a sector ring shape, the magnetic adjustment block and the small magnetic block have the same radial size along the active disk, and the thickness of the magnetic adjustment block and the small magnetic block along the axial direction of the active disk is preferably equal.

[0015] Furthermore, the magnetic adjustment block is preferably made of aluminum material, and the small magnetic block and the magnetic block are preferably made of neodymium magnets.

[0016] The advantages of the disc-type permanent magnet eddy current coupling of the present invention are as follows: 1. The two ends of the eddy current disc body are grooved, which reduces the invalid eddy current in the conductor area that does not contribute to the torque generation; the left and right end faces of the eddy current disc body are provided with a left iron block and a right iron block, and the left and right iron blocks are staggered along the circumferential direction of the eddy current disc body, which reduces the leakage magnetic flux, improves the air gap magnetic density, improves the utilization rate of the magnetic material, and makes the air gap magnetic flux density distribution more reasonable, thereby increasing the torque transmitted between the active disc and the driven disc and reducing the torque fluctuation; 2. The mixed magnetic poles in the magnetic circle can modulate the spatial distribution of the air gap magnetic field, making the spatial distribution of the air gap magnetic field more reasonable, thereby reducing the torque fluctuation caused by the distortion of the air gap magnetic field; through the layering of small magnetic blocks and non-magnetic materials with oblique magnetization, the amount of magnetic material used is reduced, the air gap magnetic density distribution is optimized, the torque output can be improved, the torque fluctuation is reduced, and the utilization rate of the permanent magnet is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an exploded schematic diagram of the slotted disc type permanent magnet eddy current coupling of the present invention;

[0018] Figure 2 It is an assembly diagram of the slotted disc type permanent magnet eddy current coupling of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the magnetic ring in the present invention;

[0020] Figure 4 It is a schematic diagram of the structure of the eddy current disk body in the present invention;

[0021] Figure 5 For along Figure 4 Sectional view along line AA;

[0022] Figure 6 It is a schematic diagram of the structure of the eddy current combination disk in the present invention;

[0023] Figure 7 This is a schematic diagram of the magnetic field distribution principle of the slotted disc permanent magnet eddy current coupling of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Example 1

[0026] from Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 It can be seen that the slotted disc permanent magnet eddy current coupling of the present invention comprises an active disc 1, an active shaft 3, a driven disc 2, and a driven shaft 4. The active disc 1 is coaxially arranged with the active shaft 3 and the two are connected. The driven disc 2 is coaxially arranged with the driven shaft 4 and the two are connected. The active disc 1 is coaxially arranged with the driven disc 2. The active disc 1 comprises a back iron disc Ⅰ5 and a magnetic ring 6. The back iron disc Ⅰ5 and the magnetic ring 6 are coaxially arranged. The magnetic ring 6 is fixed on the inner surface of the back iron disc Ⅰ5 relative to the driven disc 2. The back iron disc Ⅰ5 is connected to the active shaft 3 through a connecting column Ⅰ9; the driven disc 2 comprises an eddy current combination disc 7 and a back iron disc Ⅱ8. The eddy current combination disc 7 and the back iron disc Ⅱ8 are coaxially arranged. The eddy current combination disc 7 is arranged relative to the magnetic ring 6. The eddy current combination disc 7 and the back iron disc Ⅱ8 are tightly connected. The eddy current assembly disk 7, the back iron disk II 8 and the driven shaft 4 are connected together by a connecting column II 10; the eddy current assembly disk 7 includes an eddy current disk body 15, a plurality of left iron blocks 16, and a plurality of right iron blocks 17. Rectangular grooves or fan-shaped grooves in an annular array are distributed on the left and right end faces of the eddy current disk body 15, and the number of grooves on the left and right end faces is equal. The grooves on the left and right end faces are staggered along the circumferential direction of the eddy current disk body 15. The positions of any groove on the left end face and any groove on the right end face in the circumferential direction of the eddy current disk body 15 do not overlap. A left iron block 16 is arranged in each groove on the left end face of the eddy current disk body 15, and a right iron block 17 is arranged in each groove on the right end face of the eddy current disk body 15.

[0027] In the present invention, the back iron plate Ⅰ5 and the driving shaft 3 are relatively fixed by a plurality of connecting columns Ⅰ9, which facilitates the installation and disassembly between the driving plate 1 and the driving shaft 7; the eddy current combination plate 7, the back iron plate Ⅱ8 and the driven shaft 4 are connected by connecting columns Ⅱ10, which facilitates the installation and disassembly between the driving plate 2 and the driving shaft 4.

[0028] When the driving shaft 3 rotates relative to the driven shaft 4, the driving shaft 3 drives the driving disk 1 to rotate, and drives the magnetic ring 6 on the back iron disk Ⅰ5 to rotate relative to the driven disk 2, so that an alternating magnetic field is generated in the driven disk 2, and then an alternating eddy current is induced in the driven disk 2. The eddy current generates an induced magnetic field in the eddy current combination disk 7. The induced magnetic field interacts with the magnetic field on the permanent magnet rotor, that is, the magnetic ring 6, and a coupling torque is generated between the two rotors, thereby driving the driven disk 2 and the driven shaft 4 to rotate.

[0029] The advantages of the conductor disk of the conductor rotor in the present invention, i.e., the eddy current combination disk, are as follows: 1. The two ends of the eddy current disk body 7 are slotted to limit the eddy current path, reduce the ineffective eddy current in the conductor area that does not contribute to the torque generation, greatly reduce the loss, improve the efficiency, and reduce the heat dissipation burden of the equipment; 2. The left and right end surfaces of the eddy current disk body 15 are provided with a left iron block 16 and a right iron block 17. Because the iron block does not penetrate the eddy current disk body 15 and the left iron block 16 and the right iron block 17 are arranged alternately, the torque fluctuation caused by the left iron block 16 and the right iron block 17 can offset each other, thereby reducing the torque fluctuation, and at the same time, the magnetic attraction effect of the iron blocks alternately distributed on the left and right also reduces the leakage magnetic field. Therefore, the present invention reduces the torque fluctuation while improving the output torque of the permanent magnet eddy current coupling, and can be applied to occasions requiring precise torque control.

[0030] Example 2

[0031] from Figure 4 , Figure 5 , Figure 6 It can be seen that, as a preferred embodiment of the present invention, all the grooves on the left end surface of the eddy current disk body 15 have the same shape and size, the depth of the grooves is less than the thickness of the eddy current disk body 15, and the shape and size of the left iron block 16 are the same as the shape and size of the grooves on the left end surface of the eddy current disk body 15. All the grooves on the right end surface of the eddy current disk body 15 have the same shape and size, the depth of the grooves is less than the thickness of the eddy current disk body 15, and the shape and size of the right iron block 17 are the same as the shape and size of the grooves on the right end surface of the eddy current disk body 15.

[0032] The left iron block 16, the right iron block 17 and the eddy current disk body 15 are fixed by bonding or clamping. As long as the stability of the connection between the left iron block 16, the right iron block 17 and the eddy current disk 16 is not affected, other connection modes are also possible.

[0033] The eddy current disk body 15 is made of conductive material, preferably a copper disk.

[0034] All left iron blocks 16 have the same size and shape, and all right iron blocks 17 have the same size and shape, which facilitates processing. The left and right iron blocks are staggered to avoid overlapping, thereby improving the utilization rate of the permanent magnets.

[0035] Example 3

[0036] from Figure 3 , Figure 7 It can be seen that in the slotted disc permanent magnet eddy current coupling of the present invention: the magnetic ring 6 is composed of a plurality of mixed magnetic poles 61 in a ring shape, each mixed magnetic pole 61 is a fan-shaped ring structure and has the same shape and size, the direction of the combined magnetic field of each mixed magnetic pole 61 is along the axial direction of the active disc 1, and the directions of the combined magnetic fields of adjacent mixed magnetic poles 61 are opposite.

[0037] Among them, each hybrid magnetic pole 61 includes a magnetic block 13 and a magnetic focusing unit 14 symmetrically arranged on the left and right sides of the magnetic block 13; the magnetic block 13 and the magnetic focusing unit 14 are both fan-shaped structures, the magnetic focusing unit 14 and the magnetic block 13 have the same thickness along the axial direction of the active disk 1, and the magnetic focusing unit 14 and the magnetic block 13 have the same size along the radial direction of the active disk 1.

[0038] from Figure 7 It can be seen that the hybrid magnetic poles in the magnetic ring of the present invention can modulate the spatial distribution of the air gap magnetic field, making the spatial distribution of the air gap magnetic field more reasonable, thereby reducing the torque fluctuation caused by the distortion of the air gap magnetic field. In addition, the iron blocks alternately distributed on the left and right sides of the eddy current disk reduce the torque fluctuation and also reduce the leakage magnetic field. Therefore, the present invention improves the output torque of the permanent magnet eddy current coupling while also reducing the torque fluctuation, and can be used in occasions requiring precise torque control.

[0039] Example 4

[0040] from Figure 3 , Figure 7 It can be known that in the slotted disc permanent magnet eddy current coupling of the present invention: each magnetic focusing unit 14 includes a magnetic adjustment block 11 and a small magnetic block 12; the magnetic adjustment block 11 is a non-ferromagnetic material, the small magnetic block 12 is a permanent magnetic material, and the magnetic block 13 is a permanent magnetic material; in the same hybrid magnetic stage 61: the magnetic block 13 is magnetized along the axial direction of the active disc 1, and the angle range between the magnetization direction of the small magnetic blocks 12 on the left and right sides and the magnetization direction of the magnetic block 13 is 30°~90°.

[0041] The magnetic adjustment block 11 and the small magnetic block 12 in each magnetic focusing unit are arranged along the thickness direction of the magnetic ring 6, the magnetic adjustment block 11 and the small magnetic block 12 are fixedly connected, and the outer end surface of the magnetic adjustment block 11 is fixedly connected to the back iron disk I5.

[0042] The magnetic adjustment block 11 is in a sector ring shape, and the small magnetic block 12 is in a sector ring shape. The magnetic adjustment block 11 and the small magnetic block 12 have the same radial size along the active disk 1 , and the thickness of the magnetic adjustment block 11 and the small magnetic block 12 along the axial direction of the active disk 1 is preferably equal.

[0043] The thickness of the magnetic adjustment block 11 and the small magnetic block 12 are equal, which can improve the utilization rate of the permanent magnet.

[0044] The magnetic adjustment block 11 is preferably made of aluminum, and the small magnetic block 12 and the magnetic block 13 are preferably made of neodymium magnets.

[0045] The present invention arranges obliquely magnetized small magnets 12 on the left and right sides of the axial permanent magnet, i.e., the magnetic block 13. By layering the obliquely magnetized small magnetic block 12 and the non-magnetic material 11, the amount of magnetic material used is reduced, the air gap magnetic flux density distribution is optimized, and the torque output can also be improved, the torque fluctuation can be reduced, and the utilization rate of the permanent magnet is effectively improved.

[0046] Example 5

[0047] The magnetic ring 6 and the back iron plate Ⅰ5 are fixed by bonding or clamping. As long as the stability of the connection between the magnetic ring 6 and the back iron plate Ⅰ5 is not affected, other connection methods are also possible.

[0048] The back iron plate Ⅰ5 is a plate body that is circular in shape and has a circular hole in the center, or a plate body that is circular in shape and does not have a circular hole in the center. As long as the stability of the overall structure of the back iron plate Ⅰ5 is not affected, other plate body structures are also possible.

[0049] The back iron plate II 8 is a disk body that is generally circular with a circular hole in the center, or a disk body that is generally circular without a circular hole in the center. As long as the stability of the overall structure of the back iron plate II 8 is not affected, other disk structures are also possible.

[0050] The advantages of the disc-type permanent magnet eddy current coupling of the present invention are as follows: 1. The two ends of the eddy current disc body are grooved, which reduces the invalid eddy current in the conductor area that does not contribute to the torque generation; the left and right end faces of the eddy current disc body are provided with a left iron block and a right iron block, and the left and right iron blocks are staggered along the circumferential direction of the eddy current disc body, which reduces the leakage magnetic flux, improves the air gap magnetic density, improves the utilization rate of the magnetic material, and makes the air gap magnetic flux density distribution more reasonable, thereby increasing the torque transmitted between the active disc and the driven disc and reducing the torque fluctuation; 2. The mixed magnetic poles in the magnetic circle can modulate the spatial distribution of the air gap magnetic field, making the spatial distribution of the air gap magnetic field more reasonable, thereby reducing the torque fluctuation caused by the distortion of the air gap magnetic field; through the layering of small magnetic blocks and non-magnetic materials with oblique magnetization, the amount of magnetic material used is reduced, the air gap magnetic density distribution is optimized, the torque output can be improved, the torque fluctuation is reduced, and the utilization rate of the permanent magnet is effectively improved.

Claims

1. A slotted disc type permanent magnet eddy current coupling, comprising a driving disc (1), a driving shaft (3), a driven disc (2), and a driven shaft (4), wherein the driving disc (1) and the driving shaft (3) are coaxially arranged and connected, the driven disc (2) and the driven shaft (4) are coaxially arranged and connected, and the driving disc (1) and the driven disc (2) are coaxially arranged, wherein: The active disk (1) comprises a back iron disk I (5) and a magnetic ring (6), the back iron disk I (5) and the magnetic ring (6) are coaxially arranged, the magnetic ring (6) is fixed on the inner surface of the back iron disk I (5) opposite to the driven disk (2), and the back iron disk I (5) is connected to the active shaft (3) via a connecting column I (9); the driven disk (2) comprises an eddy current combination disk (7) and a back iron disk II (8), the eddy current combination disk (7) and the back iron disk II (8) are coaxially arranged, the eddy current combination disk (7) and the magnetic ring (6) are oppositely arranged, the eddy current combination disk (7) and the back iron disk II (8) are fastened together, and the eddy current combination disk (7), the back iron disk II (8) and the driven shaft (4) are connected via a connecting column II (10); The eddy current assembly disk (7) comprises an eddy current disk body (15), a plurality of left iron blocks (16), and a plurality of right iron blocks (17). The left and right end surfaces of the eddy current disk body (15) are both provided with rectangular grooves or fan-shaped grooves in an annular array, and the number of grooves on the left and right end surfaces is equal. The grooves on the left and right end surfaces are alternately arranged along the circumferential direction of the eddy current disk body (15). The positions of any groove on the left end surface and any groove on the right end surface in the circumferential direction of the eddy current disk body (15) do not overlap. A left iron block (16) is arranged in each groove on the left end surface of the eddy current disk body (15), and a right iron block (17) is arranged in each groove on the right end surface of the eddy current disk body (15).

2. The slotted disc permanent magnet eddy current coupling according to claim 1 is characterized in that: All the grooves on the left end surface of the eddy current disc body (15) have the same shape and size, the depth of the grooves is less than the thickness of the eddy current disc body (15), and the shape and size of the left iron block (16) are the same as those of the grooves on the left end surface of the eddy current disc body (15).

3. The slotted disc permanent magnet eddy current coupling according to claim 1 is characterized in that: All the grooves on the right end surface of the eddy current disc body (15) have the same shape and size, and the depth of the grooves is less than the thickness of the eddy current disc body (15). The shape and size of the right iron block (17) are the same as those of the grooves on the right end surface of the eddy current disc body (15).

4. The slotted disc permanent magnet eddy current coupling according to claim 1 is characterized in that: The material of the eddy current disc body (15) is a conductive material.

5. The slotted disc permanent magnet eddy current coupling according to claim 4 is characterized in that: The material of the eddy current disc body (15) is copper.

6. The slotted disc permanent magnet eddy current coupling according to claim 1 is characterized in that: The magnetic ring (6) is formed into a ring shape by a plurality of mixed magnetic poles (61), each mixed magnetic pole (61) is a fan-shaped ring structure and has the same shape and size, the direction of the combined magnetic field of each mixed magnetic pole (61) is along the axial direction of the active disk (1), and the directions of the combined magnetic fields of adjacent mixed magnetic poles (61) are opposite.

7. The slotted disc permanent magnet eddy current coupling according to claim 6 is characterized in that: Each hybrid magnetic pole (61) comprises a magnetic block (13) and a magnetic focusing unit (14) symmetrically arranged on the left and right sides of the magnetic block (13); the magnetic block (13) and the magnetic focusing unit (14) are both fan-shaped structures, the magnetic focusing unit (14) and the magnetic block (13) have the same thickness along the axial direction of the active disk (1), and the magnetic focusing unit (14) and the magnetic block (13) have the same size along the radial direction of the active disk (1).

8. The slotted disc permanent magnet eddy current coupling according to claim 7 is characterized in that: Each magnetic concentrating unit (14) comprises a magnetic adjustment block (11) and a small magnetic block (12); the magnetic adjustment block (11) is made of non-ferromagnetic material, the small magnetic block (12) is made of permanent magnetic material, and the magnetic block (13) is made of permanent magnetic material; in the same mixed magnetic pole (61): the magnetic block (13) is magnetized along the axial direction of the active disk (1), and the angle between the magnetization direction of the small magnetic blocks (12) on the left and right sides and the magnetization direction of the magnetic block (13) is in the range of 30° to 90°.

9. The slotted disc permanent magnet eddy current coupling according to claim 8, characterized in that: The magnetic adjustment block (11) and the small magnetic block (12) in each magnetic focusing unit are arranged along the thickness direction of the magnetic ring (6), the magnetic adjustment block (11) and the small magnetic block (12) are fixedly connected, and the outer end surface of the magnetic adjustment block (11) is fixedly connected to the back iron plate (I5).

10. The slotted disc permanent magnet eddy current coupling according to claim 8, characterized in that: The magnetic adjustment block (11) is in the shape of a sector ring, and the small magnetic block (12) is in the shape of a sector ring. The magnetic adjustment block (11) and the small magnetic block (12) have the same radial size along the active disk (1), and the magnetic adjustment block (11) and the small magnetic block (12) have the same axial thickness along the active disk (1).

11. The slotted disc permanent magnet eddy current coupling according to claim 8, characterized in that: The magnetic adjustment block (11) is made of aluminum material, and the small magnetic block (12) and the magnetic block (13) are made of neodymium magnets.

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