Magnetic coupling

Patent metadata

Field	Value
Publication number	US-10704553-B2
Application number	US-201515311300-A
Country	US
Kind code	B2
Filing date	May 13, 2015
Priority date	May 15, 2014
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

Disclosed is a magnetic coupling for transmitting torque along an axis of rotation, comprising two coupling parts which can be rotated relative to each other, wherein a drive-side coupling part has a drive-side permanent magnet and wherein an output-side coupling part has an output-side permanent magnet that lies opposite and at a distance from the drive-side permanent magnet along the axis of rotation. One of the coupling parts comprises a diverting element which is at least partially ferromagnetic and is non-rotatably connected to the permanent magnet of said coupling part and one part of the diverting element is disposed radially outside the opposite permanent magnet.

First claim

The invention claimed is:

1. A magnetic coupling for transmitting torque along an axis of rotation, comprising two coupling parts which can be rotated relative to each other, one of the two coupling parts being a drive-side coupling part comprising a drive-side permanent magnet, and the other of the two coupling parts being an output-side coupling part comprising an output-side permanent magnet that lies, in a direction of the axis of rotation, opposite and at a distance from the drive-side permanent magnet, wherein the drive-side permanent magnet and the output-side permanent magnet are separated by an even separation plane which is perpendicular to the axis of rotation, wherein one of the two coupling parts comprises an at least partially ferromagnetic diverting element which is non-rotatably connected to one of the drive-side permanent magnet or the output-side permanent magnet of each permanent magnet's respective coupling part, and wherein one part of the diverting element is disposed radially outside the other of the drive-side permanent magnet or the output-side permanent magnet and wherein a direction of magnetisation of the drive-side permanent magnet and a direction of magnetisation of the output-side permanent magnet are oriented perpendicular to the axis of rotation.

2. The magnetic coupling according to claim 1 , wherein the drive-side permanent magnet and the output-side permanent magnet are each 2-, 4- or 6-pole permanent magnets.

3. The magnetic coupling according to claim 1 , wherein the diverting element comprises at least one diamagnetic separation parting the diverting element into at least two ferromagnetic sections.

4. The magnetic coupling according to claim 1 , wherein the diverting element extends at a rear side of the one of the drive-side permanent magnet or the output-side permanent magnet, the rear side facing away from the other of the drive-side permanent magnet or the output-side permanent magnet.

5. The magnetic coupling according to claim 1 , wherein the diverting element comprises a hollow cylindrical jacket.

6. The magnetic coupling according to claim 1 , wherein a diamagnetic shielding element is arranged at a rear side of the permanent magnet connected to the diverting element, which rear side is facing away from the opposite permanent magnet.

7. The magnetic coupling according to claim 1 , wherein a diamagnetic shielding element is arranged at a front side of the one of the drive-side permanent magnet or the output-side permanent magnet connected to the diverting element, which front side is facing the other one of the drive-side permanent magnet or the output-side permanent magnet.

8. The magnetic coupling according to claim 1 , wherein the two coupling parts are hermetically separated.

9. The magnetic coupling according to claim 8 , wherein in order to hermetically separate the two coupling parts, at least one of the coupling parts is accommodated in a substantially non-magnetic and electrically non-conductive housing.

10. A pump having a drive and a pump rotor, with the pump rotor being connected to the drive via the magnetic coupling according to claim 1 .

11. A pump according to claim 10 , wherein the pump is configured as a medical device.

12. The magnetic coupling according to claim 5 , wherein the hollow cylindrical jacket is designed with an intermediate base arranged substantially at half height of the jacket.

13. The magnetic coupling according to claim 7 , wherein the diamagnetic shielding element is arranged at the front side of the one of the drive-side permanent magnet or the output-side permanent magnet non-rotatably connected to the diverting element, which front side is facing the other of the drive-side permanent magnet or the output-side permanent magnet in a region centred around the axis of rotation.

14. A magnetic coupling for transmitting torque along an axis of rotation, comprising two coupling parts which can be rotated relative to each other, one of the two coupling parts being a drive-side coupling part comprising a drive-side permanent magnet, and the other of the two coupling parts being an output-side coupling part comprising an output-side permanent magnet that lies opposite and at a distance from the drive-side permanent magnet along the axis of rotation, wherein one of the two coupling parts comprises an at least partially ferromagnetic diverting element which is non-rotatably connected to the one of the drive-side permanent magnet or the output-side permanent magnet of each permanent magnet's respective coupling part, and wherein one part of the diverting element is disposed radially outside the other one of the drive-side permanent magnet or the output-side permanent magnet, wherein a diamagnetic shielding element is arranged at a front side of the one of the drive-side permanent magnet or the output-side permanent magnet non-rotatably connected to the diverting element, which front side is facing the other one of the drive-side permanent magnet or the output-side permanent magnet in a region centred around the axis of rotation, and wherein the shielding element adjoins the diverting element circumferentially.

15. The pump according to claim 11 , wherein the medical device comprises an implantable blood pump.

16. The pump according to claim 15 , wherein the implantable blood pump comprises a heart blood pump.

17. The pump according to claim 3 , wherein the diamagnetic separation is formed as a diamagnetic dividing strip along a plane intersecting the one of the drive-side permanent magnet or the output-side permanent magnet centrally and transverse to the direction of magnetisation of the one of the drive-side permanent magnet or the output-side permanent magnet.

Assignees

• Univ Wien Tech

Inventors

• Janeczek Christoph
• Hinteregger Markus

Classifications

• A61M60/827

  Sealings between moving parts · CPC title

• A61M60/205

  Non-positive displacement blood pumps · CPC title

• A61M60/419

  the force acting on the blood contacting member being permanent magnetic, e.g. from a rotating magnetic coupling between driving and driven magnets · CPC title

• A61M60/122

  Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body · CPC title

• H02K49/108 Primary

  with an axial air gap · CPC title