PERMANENT-MAGNETIC RADIAL ROTATING JOINT AND MICROPUMP COMPRISING SUCH A RADIAL ROTATING JOINT

Abstract

The invention relates to a permanent-magnetic radial rotary coupling (100) comprising a first cylindrical permanent magnet (102) and a second hollow-cylindrical permanent magnet (104), wherein the inner diameter of the second permanent magnet (104) is larger than the outer diameter of the first permanent magnet (102). The first permanent magnet (102) and the second permanent magnet (104) are arranged coaxially and mounted such that they can rotate about the common axis (106). Both the first permanent magnet (102) and the second permanent magnet (104) comprise at least one pole pair. The first permanent magnet (102) comprises the same number of pole pairs as the second permanent magnet (104). The first permanent magnet (102) has a radial or a parallel magnetization and the second permanent magnet (104) comprises a Halbach array, the strong side of which is the inner side of the second permanent magnet (104).

Claims

1. A permanent-magnetic radial rotary coupling for use in a micropump to facilitate fluid flow within a heart, the permanent-magnetic radial rotary coupling comprising: a first cylindrical permanent magnet being mounted such that the first cylindrical permanent magnet is configured to rotate about a common axis, the first cylindrical permanent magnet comprising: an outer diameter; a first amount of pole pairs; and a magnetization being radial or parallel; a second hollow-cylindrical permanent magnet being arranged coaxially relative to the first cylindrical permanent magnet and being mounted such that the second hollow-cylindrical permanent magnet is configured to rotate about the common axis, the second hollow-cylindrical permanent magnet comprising: an inner diameter being larger than the outer diameter of the first permanent magnet; a second amount of pole pairs, the second amount being equal to the first amount of pole pairs; and a Halbach array comprising a strong side, the strong side being located on an inner side of the second hollow-cylindrical permanent magnet.

2. The permanent-magnetic radial rotary coupling of claim 1, wherein an outer diameter of the second hollow-cylindrical permanent magnet is less than 10 mm.

3. The permanent-magnetic radial rotary coupling of claim 1, wherein the Halbach array of the second hollow-cylindrical permanent magnet has segments.

4. The permanent-magnetic radial rotary coupling of claim 1, wherein the first permanent magnet is a hollow-cylinder.

5. The permanent-magnetic radial rotary coupling of claim 1, further comprising a shaft being disposed inside the first permanent magnet.

6. The permanent-magnetic radial rotary coupling of claim 1, wherein an axial length of the first permanent magnet is equal to an axial length of the second hollow-cylindrical permanent magnet.

7. The permanent-magnetic radial rotary coupling of claim 1, further comprising a device for magnetic return being disposed on an outside of the second hollow-cylindrical permanent magnet.

8. A micropump to facilitate fluid flow within a heart, the micropump comprising: a first cylindrical permanent magnet being mounted such that the first cylindrical permanent magnet is configured to rotate about a common axis, the first cylindrical permanent magnet comprising: an outer diameter; a first amount of pole pairs; and a magnetization being radial or parallel; a second hollow-cylindrical permanent magnet being arranged coaxially relative to the first cylindrical permanent magnet and being mounted such that the second hollow-cylindrical permanent magnet is configured to rotate about the common axis, the second hollow-cylindrical permanent magnet comprising: an inner diameter being larger than the outer diameter of the first permanent magnet; a second amount of pole pairs, the second amount being equal to the first amount of pole pairs; and a Halbach array comprising a strong side, the strong side being located on an inner side of the second hollow-cylindrical permanent magnet.

9. The micropump of claim 8, wherein an outer diameter of the micropump is less than 10 mm.

10. The micropump of claim 9, wherein the outer diameter of the micropump is less than 8 mm.

11. The micropump of claim 8, wherein an axial length of the first permanent magnet is different than an axial length of the second hollow-cylindrical permanent magnet.

12. The micropump of claim 8, wherein the first permanent magnet is positioned longitudinally offset in an axial direction relative to the second hollow-cylindrical permanent magnet.

13. The micropump of claim 12, wherein the axial direction is in a direction away from the second hollow-cylindrical permanent magnet.

14. The micropump of claim 8, further comprising: a driving shaft connected to the first permanent magnet; and an output shaft connected to the second hollow-cylindrical permanent magnet.

15. The micropump of claim 1, wherein the micropump is configured for driving an impeller-shaped rotor.

16. The permanent-magnetic radial rotary coupling of claim 2, wherein an outer diameter of the micropump is less than 10 mm.

17. The permanent-magnetic radial rotary coupling of claim 1, wherein an axial length of the first permanent magnet is different than an axial length of the second hollow-cylindrical permanent magnet.

18. The permanent-magnetic radial rotary coupling of claim 1, wherein the first permanent magnet is positioned longitudinally offset in an axial direction relative to the second hollow-cylindrical permanent magnet.

19. The permanent-magnetic radial rotary coupling of claim 18, wherein the axial direction is in a direction away from the second hollow-cylindrical permanent magnet.

20. The permanent-magnetic radial rotary coupling of claim 1, wherein an axial length of the permanent-magnetic radial rotary coupling is 5 mm.

21. The permanent-magnetic radial rotary coupling of claim 1, further comprising: a driving shaft connected to the first permanent magnet; and an output shaft connected to the second hollow-cylindrical permanent magnet.

22. The permanent-magnetic radial rotary coupling of claim 1, wherein the permanent-magnetic radial rotary coupling is configured for use in a micropump for driving an impeller-shaped rotor.

Description

[0027] Design examples of the invention are shown in the drawings and are explained in more detail in the following description.

[0028] FIG. 1 shows a radial section of a permanent-magnetic radial rotary coupling according to a design example of the invention.

[0029] FIGS. 2 and 3 show side views according to two design examples of the invention.

[0030] FIG. 4A shows a radial sectional view of an embodiment of a permanent-magnetic radial rotary coupling according to a design example of the invention.

[0031] FIG. 4B shows a side view according to the embodiment of FIG. 4A.

[0032] FIG. 1 shows a sectional view of the permanent-magnetic radial rotary coupling transverse to the axis of rotation according to a design example of the invention. FIG. 1 shows a permanent-magnetic radial rotary coupling 100, which comprises a first permanent magnet 102 and a second permanent magnet 104. Both the first permanent magnet 102 and the second permanent magnet 104 are hollow-cylindrical. A driving shaft can be disposed inside the first permanent magnet 102.

[0033] The inner diameter of the second permanent magnet 104 is larger than the outer diameter of the first permanent magnet 102. The first permanent magnet 102 and the second permanent magnet 104 are furthermore arranged coaxially. Both the first permanent magnet 102 and the second permanent magnet 104 are mounted such that they can rotate about the common axis 106.

[0034] The first permanent magnet 102 is magnetized in parallel and comprises one pole pair. In the case of a cylinder or hollow cylinder, as in the case of the first permanent magnet 102, one can also speak of diametrical magnetization.

[0035] The second permanent magnet 104 likewise comprises one pole pair. The second permanent magnet 104 is furthermore realized as a Halbach array, the strong side of which is the inner side of the second permanent magnet 104.

[0036] The second permanent magnet 104 comprises eight 45° segments in the outer ring, while the first permanent magnet 102 consists of only a single component. This is one reason why the first permanent magnet 102 can be made so small.

[0037] FIG. 2 shows a side view of the permanent-magnetic radial rotary coupling 100 of the embodiment of FIG. 1. It can be seen here that the axial extension of the first permanent magnet 102 is greater than the axial extension of the second permanent magnet 104. It can further be seen that the first permanent magnet 102 is connected on one side to a driving shaft 108.

[0038] FIG. 3 shows a side view of a permanent-magnetic radial rotary coupling 100 according to a further embodiment. It can be seen here that the axial extension of the first permanent magnet 102 is smaller than the axial extension of the second permanent magnet 104, whereby both axial ends of the first permanent magnet 102 are located inside the second permanent magnet 104. It can further be seen that the first permanent magnet 102 is connected on both sides to a driving shaft 108.

[0039] FIG. 4A shows a sectional view of an embodiment of a permanent-magnetic radial rotary coupling according to a design example of the invention.

[0040] FIG. 4A shows a permanent-magnetic radial rotary coupling 100, which likewise comprises a first permanent magnet 102 and a second permanent magnet 104 as in the embodiment of FIG. 1.

[0041] In contrast to the embodiment of FIG. 1, however, according to the embodiment of FIG. 4A, both the first permanent magnet 102 and the second permanent magnet 104 respectively comprise two pole pairs. The inner first permanent magnet 102 comprises four 90° segments in radial magnetization, while the outer second permanent magnet 104 comprises eight 45° segments as a Halbach array.

[0042] FIG. 4B shows a side view of the embodiment of FIG. 4A. It can be seen here that the inner first permanent magnet 102 is connected on one side to a driving shaft 108, while the outer second permanent magnet 104 is connected on the other side to an output shaft 110 by means of an axial connecting ring 112. The inner first permanent magnet 102 is furthermore axially offset relative to the outer second permanent magnet 104 in order to produce an axial force.

[0043] For a coupling in a blood pump, for example, the first permanent magnet has the following dimensions: an inner diameter of 1 mm, an outer diameter of 3 mm and a magnet thickness of 1 mm. For the same example of a coupling in a blood pump, the second permanent magnet has the following dimensions: an inner diameter of 4 mm, an outer diameter of 5 mm and a magnet thickness of 0.5 mm.