Magnetic rotary couplings for torque transmission

Abstract

A magnetic end-face rotary coupling (100) for transmitting torque includes a first coupling half (102) connectable to a first shaft and a second coupling half (104) connectable to a second shaft. The first coupling half (102) includes a first permanent magnet (106) having a Halbach array magnet configuration.

Description

Technical Field

[0001] The invention relates to a magnetic end face rotation coupling for transmitting torque. Background Art

[0002] Magnetic couplings exist in the prior art, enabling contactless torque transmission using coaxially aligned magnets or magnet pairs. Furthermore, deflection elements can be used to guide the magnetic flux, thereby increasing the transmittable torque and improving efficiency. Depending on the applied torque, the two coupling components twist relative to each other by several degrees. This twisting generates a stable counter-torque corresponding to the externally applied torque.

[0003] In the prior art, increasing the number of magnetic poles can be used to increase transmittable torque. However, this is limited by manufacturability and magnetization, particularly in small sizes. Active flux guidance through other components can help increase torque. However, achieving the necessary torque is difficult in very small sizes or with very limited installation space, or the arrangement is difficult to structurally control and adhere to the available installation space.

[0004] If components that can be used to guide the magnetic flux or other passive components are added to shield the magnetic field, the installation space is further reduced, which often causes structural problems.

[0005] It is also known in the prior art to produce permanent magnetic synchronous couplings with permanent magnetic rings, so-called end-face rotation couplings.

[0006] Each magnetic ring is multipolar in the direction of rotation and magnetized axially. An additional iron back yoke guides the magnetic flux. The moment is transmitted via the magnetic field, allowing the use of separators made of non-magnetizable materials.

[0007] In a rotary coupling, the axial attractive magnetic forces are counteracted by the design. This coupling type is therefore primarily used only for drives with a maximum power of 5 kW. The separator is made of a material with low electrical conductivity. Summary of the Invention

[0008] The object of the present invention is to provide a magnetic end face rotary coupling, by which the proportional relationship between the transmittable torque and the installation space can be improved, so that within a given installation space, a greater torque can be transmitted than a magnetic coupling with the above-mentioned structural style.

[0009] This object is achieved by a magnetic rotary coupling having the features of claim 1. Advantageous embodiments of the invention are specified in the dependent claims.

[0010] The magnetic rotary coupling according to the invention is used for transmitting torque, which can occur, for example, from one shaft to another.

[0011] The magnetic end face rotary coupling according to the invention has a first coupling half, which can be connected to a first shaft, and a second coupling half, which can be connected to a second shaft.

[0012] In this case, the first coupling half has a first permanent magnet having a magnet configuration in the form of a Halbach array.

[0013] The permanent magnet can in particular be formed by a Halbach array.

[0014] A permanent magnet is understood here to be a permanent magnet having a Halbach array magnet structure in which the magnetic flux is low on one side (the so-called weak side) because the magnetic flux there is essentially canceled out, while the magnetic flux is high on the other side (the so-called strong side) because the magnetic flux there is intensified.

[0015] In the present case, a Halbach array is understood here to mean a magnet array, as described under the link https: / / en.wikipedia.org / wiki / Halbach_array, to which reference is hereby made and whose disclosure is fully included in the description of the present invention.

[0016] The magnet structure of a Halbach array can be formed from permanent magnet segments that are positioned together and whose magnetization directions are each tilted at 90° relative to a preferred direction, for example, relative to the longitudinal axis of the array. This method can achieve side-related flux enhancement. For further information, please refer to the professional literature on Halbach arrays.

[0017] The end-face rotary coupling advantageously allows for the concentration of magnetic flux without the need for additional flux guide arrays. This, in turn, leads to a reduction in the required overall volume, or in the volume of the magnets themselves. In other words, given the same magnet volume, the same magnetic flux can be achieved without the need for additional structural measures (e.g., yokes). Consequently, within the same installation space, the torque can be increased compared to conventional arrangements with flux return. Alternatively, the magnet volume can be reduced while maintaining the same torque.

[0018] According to a preferred embodiment, the end-face rotation coupling may be a coupling of a cardiac support system, in particular a pump of such a system.

[0019] According to a preferred embodiment, the second coupling half is axially magnetized, which can be done with or without a yoke. As a result, the magnetic field is advantageously guided axially from the second coupling half to the first coupling half, thereby achieving a force between the first and second coupling halves that is greater than would be the case if the second coupling half were not axially magnetized.

[0020] Without limiting the generality, according to another embodiment, the first coupling half and the second coupling half may be interchanged.

[0021] According to another preferred embodiment, the second coupling half has a second permanent magnet having a Halbach array, in particular a Halbach array. Particularly preferably, the second coupling half is structurally identical to the first coupling half. Furthermore, preferably, the magnetization of the first and second coupling halves points in the same direction, and according to yet another preferred embodiment, their magnetizations are identical. This feature advantageously enables symmetrical production of the end-face rotary coupling and allows high axial magnetic forces to act between the two coupling halves.

[0022] According to another preferred embodiment, the first and second coupling halves face each other at their ends. Preferably, the distance between the first and second coupling halves is as small as possible. This feature advantageously ensures that the magnetic force acting between the first and second coupling halves is as strong as possible.

[0023] According to a preferred embodiment, the first shaft can be connected to the driving shaft, and the second shaft can be connected to the driven shaft. This feature advantageously enables the torque of the driving shaft to be transmitted to the driven shaft.

[0024] According to a preferred embodiment, the first coupling half and the second coupling half are coaxially arranged. Furthermore, preferably, the first coupling half and the second coupling half are opposite each other. This feature advantageously ensures that the relative position of the first coupling half and the second coupling half remains the same at every point in time during the rotational movement of the shaft. Consequently, the magnetic force between the first and second coupling halves remains constant at a maximum value over time.

[0025] According to a preferred embodiment, the strong side of the Halbach array of the first half coupling and / or the second half coupling points to the other half coupling. For the case where both the first half coupling and the second half coupling have permanent magnets, and each permanent magnet has a Halbach array, it is further preferred that the strong side of the Halbach array of the first half coupling and the strong side of the Halbach array of the second half coupling are both located on the end faces of the corresponding half coupling. Here, the end face of the half coupling should be understood to refer to the side that is closer to the corresponding other half coupling. This feature advantageously achieves that the strong magnetic flux of each half coupling is used to couple with the corresponding other half coupling, and to a certain extent will not be wasted on the side that deviates from the corresponding other half coupling.

[0026] According to a preferred embodiment, the magnetic field of the first coupling half and / or the second coupling half is a single-pole pair or a multi-pole pair, wherein each pole of one coupling half is opposite to the opposite pole of the other coupling half.

[0027] According to a preferred embodiment, the first coupling half and the second coupling half each have 2n or 2n+1 segments, where n is an integer greater than or equal to 1. Each segment of the first coupling half, preferably having one polarity, lies opposite a corresponding segment of the second coupling half having the opposite polarity.

[0028] According to a preferred embodiment, at least one of the first and second coupling halves has a circular or annular shape. Preferably, the first or second coupling half has a circular or annular magnet or a similar shape. Such a shape is particularly useful for applications where torque is transmitted via a shaft.

[0029] According to a preferred embodiment, the first half coupling and the second half coupling each have a disk-shaped magnet. This shape is very practical for the present application of transmitting torque via the shaft.

[0030] According to a preferred embodiment, the radius of the first coupling half and the radius of the second coupling half are the same. According to another preferred embodiment, the axial length of the first coupling half and the axial length of the second coupling half are the same. These features have the advantage that the coupling halves can be manufactured similarly or identically.

[0031] According to a preferred embodiment, the first coupling half and / or the second coupling half each have at least two coupling parts. In this case, each coupling part can realize the selection of a section of the Halbach array. This feature makes it possible to realize the Halbach array in a simple manner.

[0032] Preferably, the first and second coupling halves have the same number and arrangement. Further preferably, the coupling components of the coupling halves are arranged symmetrically relative to the plane between the first and second coupling halves. This has the advantages of a simple structure and optimal magnetic field distribution.

[0033] Preferably, the magnetization direction of the first coupling half and / or the second coupling half extends in the axial direction, at least in a region distal from the axial axis. In this case, the magnetization directions of the first and second coupling halves point in the same direction. This has the advantage of achieving a strong coupling between the coupling halves.

[0034] According to a preferred embodiment, the coupling components can be arranged on the shafts respectively.According to another preferred embodiment, the coupling components can be arranged on a bracket on the rear side of the coupling half. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The invention is explained in more detail below with reference to exemplary embodiments which are represented in a schematic manner in the drawings.

[0036] Figure 1A A magnetic end face rotary coupling according to an exemplary embodiment of the present invention is shown in side view;

[0037] Figure 1B yes Figure 1A A front view of the magnetic end face rotary coupling along a cross section;

[0038] Figure 2A A magnetic end face rotary coupling according to another exemplary embodiment of the present invention is shown in a side view;

[0039] Figure 2B yes Figure 2A A front view of the magnetic end face rotary coupling along a cross section;

[0040] Figure 3A A magnetic end face rotary coupling according to another exemplary embodiment of the present invention is shown in a side view;

[0041] Figure 3B yes Figure 3A A front view of the magnetic end face rotary coupling along a cross section;

[0042] Figure 4A A magnetic end face rotary coupling according to another exemplary embodiment of the present invention is shown in a side view;

[0043] Figure 4B yes Figure 4A A front view of the magnetic end face rotary coupling along a cross section;

[0044] Figure 5AA magnetic end face rotary coupling according to another exemplary embodiment of the present invention is shown in a side view;

[0045] Figure 5B yes Figure 5A A front view of a magnetic end face rotating coupling, wherein: Figure 5A It is along Figure 5B A cross-sectional view taken along line aA in FIG.

[0046] Figure 6A The side view shows the Figure 5A and Figure 5B An exemplary embodiment of a magnetic end face rotary coupling, wherein, Figure 6A It is along Figure 6B A cross-sectional view taken along line bB in FIG.

[0047] Figure 6B yes Figure 6A A front view of the magnetic end face rotating coupling;

[0048] Figure 7A 、 7B 7C and 7C respectively show a half coupling of a magnetic end face rotary coupling for transmitting torque according to another exemplary embodiment of the present invention in three different views. DETAILED DESCRIPTION

[0049] Figure 1A A magnetic end face rotary coupling 100 for transmitting torque according to an exemplary embodiment of the present invention is shown in a side view.

[0050] The magnetic end rotary coupling 100 has a first coupling half 102 that can be connected to a first shaft and a second coupling half 104 that can be connected to a second shaft.

[0051] The first coupling half 102 has a first permanent magnet 106 having a Halbach array magnet configuration. The second coupling half 104 has a second permanent magnet 108 having a Halbach array magnet configuration.

[0052] The first coupling half 102 and the second coupling half 104 are arranged symmetrically with respect to a symmetry plane 110 , which is arranged in the middle of the first coupling half 102 and the second coupling half 104 and extends along the y-axis.

[0053] The first coupling half 102 has three coupling parts 111, 112, and 113 that are magnetized and form the first permanent magnet 106. The coupling parts 111, 112, and 113 are segments of a permanent magnet with different magnetization directions. The second coupling half 104 has three coupling parts 114, 115, and 116 that are magnetized and form the second permanent magnet 108. The coupling parts 114, 115, and 116 are segments of the second permanent magnet 108 with different magnetization directions.

[0054] The first coupling half 102 has the same dimensions as the second coupling half 104. The first coupling half 102 and the second coupling half 104 are each circular and, when used as intended, rotate about an x-axis passing through the centers of the first coupling half 102 and the second coupling half 104. Figure 1B A front view of the magnetic end face rotary coupling 100 is shown from the right along the section marked by the dashed line 105. The second coupling half 104 can be seen here, while the first coupling half 102 is covered by the second coupling half 104.

[0055] Coupling members 111 and 114 have the same magnetization extending in the negative x-axis direction. Coupling members 113 and 116 have the same magnetization extending in the positive x-axis direction.

[0056] The coupling parts 112 and 115 have opposite magnetizations, wherein the coupling part 112 extends along the positive y-axis and the coupling part 115 extends along the negative y-axis.

[0057] The three coupling parts 111, 112 and 113 of the first half coupling 102 form a Halbach array. Therefore, the first permanent magnet 106 has a magnet structure of a Halbach array. A Halbach array with only three segments may be the smallest Halbach array. The three coupling parts 114, 115 and 116 of the second half coupling 104 also form a Halbach array. Therefore, the second permanent magnet 108 also has a magnet structure of a Halbach array. Figure 1A In the view of FIG, the magnetization direction of coupling part 112 is tilted 90° relative to the magnetization direction of coupling part 111 about an axis perpendicular to the x-axis and y-axis shown in the figure. The magnetization direction of coupling part 113 is tilted 90° relative to the magnetization direction of coupling part 112 about an axis perpendicular to the x-axis and y-axis, and is tilted 180° relative to the magnetization direction of coupling part 111 about this axis. Accordingly, in FIG. Figure 1A, the magnetization direction of coupling member 115 is tilted 90° about an axis perpendicular to the x-axis and y-axis shown in the figure relative to the magnetization direction of coupling member 114. The magnetization direction of coupling member 116 is tilted 90° about an axis perpendicular to the x-axis and y-axis relative to the magnetization direction of coupling member 115 and is tilted 180° about this axis relative to the magnetization direction of coupling member 111.

[0058] exist Figure 1A The magnetized coupling parts 111 and 113 of the first coupling half 102 shown on the left together generate a magnetic field which points downward on the right side of the first coupling half 102 and upward on the left side of the first coupling half 102 . Figure 1A The coupling part 112 of the first half coupling 102 shown in generates a magnetic field which points downwards on the right side of the first half coupling 102 and which points upwards on the left side of the first half coupling 102. If the total magnetic field of the coupling parts 111, 112 and 113 is calculated, the result on the right side of the first half coupling 102 is a mutual reinforcement of the magnetic field components which originate from the coupling part 112 on the one hand and from the coupling parts 111 and 113 on the other hand, while the result on the left side of the first half coupling 102 is a mutual weakening of the magnetic field components which originate from the coupling part 112 on the one hand and from the coupling parts 111 and 113 on the other hand. The magnetic field on the right side of the first half coupling 102 is greater than the magnetic field on the left side. Figure 1A In the view, the strong side of the Halbach array of the first permanent magnet 106 (i.e., such side of the Halbach array is strong in the magnetic field) is located on the right side of the first half coupling 102, and the weak side of the Halbach array of the first permanent magnet 106 (i.e., such side of the Halbach array is weak in the magnetic field) is located on the left side of the first half coupling.

[0059] Accordingly, on the left side of the second coupling half 104, there is a mutual strengthening of the magnetic field components originating from coupling part 115 on the one hand and from coupling parts 114 and 116 on the other hand, while on the right side of the second coupling half 104, there is a mutual weakening of the magnetic field components originating from coupling part 115 on the one hand and from coupling parts 114 and 116 on the other hand. The magnetic field on the right side of the second coupling half 104 is weak, and the magnetic field on the left side of the second coupling half 104 is strong. Figure 1A In the view, the strong side of the Halbach array of the second permanent magnet 108 (i.e., such side of the Halbach array is strong in the magnetic field) is located on the left side of the second half coupling 104, and the weak side of the Halbach array of the second permanent magnet 108 (i.e., such side of the Halbach array is weak in the magnetic field) is located on the right side of the second half coupling 104.

[0060] Therefore, the total magnetic field between the first half coupling 102 and the second half coupling 104 is strong, while the total magnetic field outside the first half coupling 102 and the second half coupling 104 is weak. Thus, a strong coupling is generated between the first half coupling 102 and the second half coupling 104.

[0061] The coupling parts 111 , 112 and 113 in the form of segments of the first permanent magnet 106 in the first coupling half 102 together with the coupling parts 114 , 115 and 116 in the form of segments of the second permanent magnet 108 in the second coupling half 108 form a monopole pair array.

[0062] Figure 2A A magnetic end face rotary coupling 100 for transmitting torque according to another exemplary embodiment of the present invention is shown in a side view. Figure 2B Shown according to Figure 2A The front view of the cross section of the magnetic end face rotating coupling. Figure 1A and Figure 1B Unlike the exemplary embodiment, the first coupling half 102 and the second coupling half 104 each have a non-magnetic mounting plate 130 .

[0063] Figure 3A A magnetic end face rotary coupling 100 for transmitting torque according to another exemplary embodiment of the present invention is shown in a side view. Figure 3B Shown according to Figure 3A Front view along the cross section of a magnetic end face rotary coupling. Figure 3A and Figure 3B An exemplary embodiment of Figure 2A and Figure 2B The exemplary embodiment differs in that the mounting plate 130 of the first coupling half 102 and the mounting plate 130 of the second coupling half 104 are each connected to a shaft. The mounting plate 130 of the first coupling half 102 is connected to a driving shaft 132, and the mounting plate 130 of the second coupling half 104 is connected to a driven shaft 134.

[0064] Figure 4A A magnetic end face rotary coupling 100 for transmitting torque according to yet another exemplary embodiment of the present invention is shown in a side view. Figure 4B Shown according to Figure 4A Front view along the cross section of a magnetic end face rotary coupling. Figure 3A and Figure 3B An exemplary embodiment of Figure 3A and Figure 3B The exemplary embodiment of FIG. 1 differs in that the drive shaft 132 and the driven shaft 134 are both directly connected to the magnets of the first coupling half 102 and the magnets of the second coupling half 104 , respectively.

[0065] Figure 5A A magnetic end face rotary coupling 100 for transmitting torque according to yet another exemplary embodiment of the present invention is shown in a side view. Figure 5B Shown according to Figure 5A Front view of a magnetic end face rotary coupling. Figure 5A It is a cross-sectional view along line aA. Figure 5A and Figure 5B An exemplary embodiment of Figure 1A and Figure 1B The exemplary embodiment of the present invention differs in that the end face rotary coupling 100 is a two-pole coupling. The first half coupling 102 and the second half coupling 104 each have four sections. Figure 6A and Figure 6B Shown in Figure 5A and Figure 5B The same exemplary embodiment, however, Figure 6A A cross-sectional view along line bB is shown.

[0066] Figure 7B A first half coupling 102 of a magnetic end face rotary coupling 100 for transmitting torque according to a further exemplary embodiment of the present invention is shown in a side view. Figure 7A and Figure 7C Shown respectively according to Figure 7B A front view of the second half 102 of the magnetic end face rotary coupling. Figure 7A Showing a view from the left side, Figure 7C A view from the right side is shown.

[0067] In this case, the first coupling half 102 is a four-pole variant with a total of five segments. On the inside, i.e., the side facing away from the end face, a ring magnet is attached to the first coupling half 102 as one segment, and one half of the first coupling half 102 has four segments on the end face. The magnetic end face rotary coupling 100 for transmitting torque has two such coupling halves that lie opposite one another.

[0068] In particular, the following preferred features of the present invention are summarized:

[0069] The magnetic end face rotary coupling 100 for transmitting torque has a first coupling half 102 that can be connected to a first shaft and a second coupling half 104 that can be connected to a second shaft. The first coupling half 102 has a first permanent magnet 106 having a Halbach array magnet configuration.

[0070] In particular, the present invention relates to the aspects indicated in the following clauses:

[0071] 1. A magnetic end face rotary coupling (100) for transmitting torque, comprising:

[0072] A first coupling half (102) connected to the first shaft; and

[0073] a second coupling half (104) connected to the second shaft;

[0074] The first half coupling (102) has a first permanent magnet (106) having a Halbach array.

[0075] 2. The magnetic end face rotary coupling (100) according to clause 1, characterized in that the second half coupling (104) is axially magnetized.

[0076] 3. The magnetic end face rotary coupling (100) according to clause 1, characterized in that the second half coupling (104) has a second permanent magnet (108), and the second permanent magnet (108) has a Halbach array.

[0077] 4. The magnetic end face rotary coupling (100) according to any one of the preceding clauses, characterized in that the first half coupling (102) and the second half coupling (104) are opposite each other at the ends.

[0078] 5. The magnetic end face rotary coupling (100) according to any one of the preceding clauses, characterized in that the first shaft is connected to the driving shaft (132) and the second shaft is connected to the driven shaft (134).

[0079] 6. The magnetic end face rotary coupling (100) according to any one of the preceding clauses, characterized in that the first half coupling (102) and the second half coupling (104) are coaxially arranged.

[0080] 7. A magnetic end face rotary coupling (100) according to any one of the above clauses, characterized in that the strong side of the Halbach array of the first half coupling (102) and / or the second half coupling (104) points towards the other half coupling respectively.

[0081] 8. The magnetic end face rotary coupling (100) according to any one of the preceding clauses, characterized in that the magnetic field of the first half coupling and / or the second half coupling is a single pole pair or a multi-pole pair.

[0082] 9. The magnetic end face rotary coupling (100) according to any one of the preceding clauses, characterized in that the first half coupling (102) and the second half coupling (104) each have 2n segments, wherein n is an integer greater than or equal to 1.

[0083] 10. The magnetic end rotation coupling (100) according to any one of the preceding clauses, characterized in that at least one of the first coupling half (120) and the second coupling half (104) has a circular or annular shape.

[0084] 11. The magnetic end face rotary coupling (100) according to any one of the preceding clauses, characterized in that the first coupling half (102) and the second coupling half (104) each have a disk-shaped magnet.

[0085] 12. The magnetic end face rotary coupling (100) according to any one of the preceding clauses, characterized in that the radius of the first half coupling (102) and the radius of the second half coupling (104) are of the same size.

[0086] 13. The magnetic end face rotary coupling (100) according to any one of the preceding clauses, characterized in that the axial length of the first half coupling (102) and the axial length of the second half coupling (104) are the same.

[0087] 14. A magnetic end face rotary coupling (100) according to any of the preceding clauses, characterized in that the first half coupling (102) and / or the second half coupling (104) each have at least two coupling parts (111, 112, 113, 114, 115, 116).

Claims

1. A magnetic disc coupling for transmitting torque in a cardiac support system, the magnetic disc coupling comprising: a first coupling half configured to be connected to the first shaft, the first coupling half including an end face and a first permanent magnet having a magnet configuration of a Halbach array; as well as a second coupling half configured to be connected to a second shaft; wherein the first permanent magnet comprises one or more first coupling components having a first magnetization direction, one or more second coupling components having a second magnetization direction opposite to the first magnetization direction, and one or more third coupling components having a third magnetization direction inclined by 90° relative to the first magnetization direction; wherein the end surface of the first half coupling faces the second half coupling; and Wherein, the one or more third coupling components do not extend to the end face.

2. The magnetic disc coupling according to claim 1, wherein: The first permanent magnet includes a strong side surface.

3. The magnetic disc coupling according to claim 2, wherein: The first permanent magnet includes a weak side facing away from the strong side.

4. The magnetic disc coupling according to claim 2, wherein: The strong side of the first permanent magnet faces the second coupling half.

5. The magnetic disc coupling according to claim 1, wherein: The second coupling half is axially magnetized.

6. The magnetic disc coupling according to claim 1, wherein: The second coupling half includes a second permanent magnet having a magnet configuration of a Halbach array.

7. The magnetic disc coupling according to claim 6, wherein: The second permanent magnet includes a strong side surface.

8. The magnetic disc coupling according to claim 7, wherein: The second permanent magnet includes a weak side facing away from the strong side.

9. The magnetic disc coupling according to claim 7, wherein: The strong side of the second permanent magnet faces the first coupling half.

10. The magnetic disc coupling according to claim 6, wherein: The magnet configuration of the second permanent magnet includes 2n or 2n+1 segments, and wherein n is an integer greater than or equal to 1.

11. The magnetic disc coupling according to claim 10, wherein: The number of segments of the magnet configuration of the first permanent magnet is the same as the number of segments of the magnet configuration of the second permanent magnet.

12. The magnetic disc coupling according to claim 1, wherein: The magnet configuration of the first permanent magnet includes 2n or 2n+1 segments, and wherein n is an integer greater than or equal to 1.

13. The magnetic disc coupling according to claim 1, wherein: An end face of the first coupling half and an end face of the second coupling half are positioned opposite to each other.

14. The magnetic disc coupling according to claim 1, wherein: The first shaft is configured to be connected to a driving shaft, and the second shaft is configured to be connected to a driven shaft.

15. The magnetic disc coupling according to claim 1, wherein: The first half-coupling and the second half-coupling are coaxially arranged.

16. The magnetic disc coupling according to claim 1, wherein: At least one of the magnetic field of the first coupling half and / or the magnetic field of the second coupling half is a single pole pair or a multi-pole pair.

17. The magnetic disc coupling according to claim 1, wherein: At least one of the first coupling half and / or the second coupling half has a circular or annular shape.

18. The magnetic disc coupling according to claim 1, wherein: The first coupling half and the second coupling half each include a disc magnet.

19. The magnetic disc coupling according to claim 1, wherein: The radius of the first coupling half and the radius of the second coupling half have the same size.

20. The magnetic disc coupling according to claim 1, wherein The axial length of the first half coupling and the axial length of the second half coupling are of the same size.

21. The magnetic disc coupling according to claim 1, wherein: The second coupling half comprises at least two coupling parts.

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