Magnetization Of A Hollow Shaft

• US 20190318859A1
• Filed: 03/27/2017
• Published: 10/17/2019
• Est. Priority Date: 07/12/2016
• Status: Active Grant

• Current Assignee: Ncte AG
• Original Assignee: Ncte AG
• Inventors: Seene, Christian, Hamp, Marianne
• Granted Patent: US 11,094,441 B2
• Time in Patent Office: Days
• CPC Class Codes: H01F 13/003 Methods and devices for magnetising permanent magnets permanent magnets H01F7/02
• CPC Class Codes: H01F 7/0273 Magnetic circuits with PM for magnetic field generation

Abstract

The present invention discloses an apparatus for magnetizing a ferromagnetic, electrically conductive hollow shaft, the apparatus comprising: an electrically conductive rod-like element for generating one or a plurality of magnetic fields by means of an internal contact device arranged thereon and used for contacting with an inner contact region on an inner side of the hollow shaft; an external contact device for contacting with an outer contact region on an outer side of the hollow shaft; and a current source for generating a current pulse through the rod-like element, the internal contact device and the external contact device and also through the hollow shaft between the inner and outer contact regions; wherein a first pole of the current source is connected to or adapted to be connected to at least one current supply contact point of the rod-like element and a second pole of the current source is connected to or adapted to be connected to the external contact device, and wherein an electrical polarity of the first pole is opposite to the electrical polarity of the second pole. The invention further discloses a corresponding method.

Claims

1-15. -15. (canceled)

16. An apparatus for magnetizing a ferromagnetic, electrically conductive hollow shaft, the apparatus comprising:

an electrically conductive rod-like element for generating at least one magnetic field via an internal contact device arranged thereon, the internal contact device used for contacting with an inner contact region on an inner surface of the hollow shaft;

an external contact device for contacting with an outer contact region on an outer surface of the hollow shaft;

a current source for generating a current pulse through the rod-like element, the internal contact device, and the external contact device, and also through the hollow shaft between the inner and outer contact regions;

wherein the current source has a first pole and a second pole, wherein an electrical polarity of the first pole is opposite to the electrical polarity of the second pole;

wherein the first pole of the current source is connected to or adapted to be connected to at least one current supply contact point of the rod-like element; and

wherein the second pole of the current source is connected to or adapted to be connected to the external contact device.

17. The apparatus of claim 16, wherein the external contact device comprises an electrically conductive cylindrical element in which at least part of the hollow shaft can be arranged during magnetization.

18. The apparatus of claim 16, wherein the internal contact device and the external contact device are arranged radially opposite each other with respect to the hollow shaft.

19. The apparatus of claim 16, wherein:

the internal contact device is annular in shape, and/or

the external contact device is annular in shape.

20. The apparatus of claim 16:

wherein the internal contact device comprises a plurality of inner contact elements arranged in a circle, the internal contact elements spring biased toward the hollow shaft to be magnetized;

or

wherein the external contact device comprises a plurality of external contact elements arranged in a circle, the external contact elements spring biased toward the hollow shaft to be magnetized.

21. The apparatus of claim 20, wherein:

the internal contact elements are arranged at regular angular distances from one another in the circumferential direction of the hollow shaft;

or

the external contact elements are arranged at regular angular distances from one another in the circumferential direction of the hollow shaft.

22. The apparatus of claim 16:

wherein the internal contact device comprises a plurality of inner contact elements arranged in a circle, the internal contact elements spring biased toward the hollow shaft to be magnetized; and

wherein the external contact device comprises a plurality of external contact elements arranged in a circle, the external contact elements spring biased toward the hollow shaft to be magnetized.

23. The apparatus of claim 22, wherein a number of internal contact elements and a number of external contact elements is equal.

24. The apparatus of claim 22, wherein:

the internal contact elements are arranged at regular angular distances from one another in the circumferential direction of the hollow shaft; and

the external contact elements are arranged at regular angular distances from one another in the circumferential direction of the hollow shaft.

25. The apparatus of claim 16:

wherein two current supply contact points are provided;

wherein the internal contact device is arranged on the rod-like element between the two current supply contact points;

wherein;

both current supply contact points are electrically connectable to the first pole of the current source;

or

one current supply contact point is electrically connected to the first pole of the current source and the other current supply contact point is electrically connectable to the first pole of the current source.

26. A method of magnetizing a ferromagnetic, electrically conductive hollow shaft, the method comprising:

inserting an electrically conductive rod-like element, which has an internal contact device arranged thereon, into a hollow space of the hollow shaft such that the rod-like element is arranged on and along an axis of the hollow shaft;

contacting the internal contact device with an inner contact region on an inner surface of the hollow shaft;

contacting an external contact device with an outer contact region on an outer surface of the hollow shaft;

generating a current pulse through the rod-like element, the internal contact device, and the external contact device, and also through the hollow shaft between the inner and outer contact regions, the hollow shaft being magnetized with the thus generated magnetic field of the rod-like element through which the current flows.

27. The method of claim 26, further comprising arranging the hollow shaft in an electrically conductive cylindrical element of the external contact device, wherein the axis of the hollow shaft is arranged on and along an axis of the cylindrical element.

28. The method of claim 26, wherein the internal contact device and the external contact device are arranged radially opposite each other with respect to the hollow shaft.

29. The method of claim 26:

wherein the internal contact device is annular in shape, and further comprising bringing the internal contact device into contact with the inner surface of the hollow shaft; and

/or

wherein the external contact device is annular in shape, and further comprising bringing the external contact device into contact with the outer surface of the hollow shaft.

30. The method of claim 26:

wherein the internal contact device comprises a plurality of internal contact elements arranged in a circle, and further comprising bringing the internal contact elements into contact with the inner surface of the hollow shaft; and

/or

wherein the external contact device comprises a plurality of external contact elements arranged in a circle, and further comprising bringing the external contact elements into contact with the outer surface of the hollow shaft.

31. The method of claim 30:

wherein in number of internal contact elements equals a number of external contact elements; and

further comprising arranging the internal and external contacts elements radially opposite each other with respect to the hollow shaft.

32. The method of claim 30, wherein the internal and external contact elements are arranged at regular angular distances from one another in the circumferential direction of the hollow shaft.

33. The method of claim 26:

wherein the rod-like element comprises two current supply contact points;

further comprising, prior to the generating the current pulse;

providing a current source having first and second poles, wherein an electrical polarity of the first pole is opposite to the electrical polarity of the second pole;

disposing the two current supply contact points opposite each other with respect to the internal contact device;

connecting the two current supply contact points to the first pole of a current source;

connecting the external contact device to the second pole of the current source.