Correction of angle errors in permanent magnets

Patent metadata

Field	Value
Publication number	US-9601251-B2
Application number	US-201314649105-A
Country	US
Kind code	B2
Filing date	Dec 9, 2013
Priority date	Dec 7, 2012
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

At least two partial magnets mechanically connected to each other. The length of each partial magnet runs in the main magnetisation direction of each partial magnet and/or in the main direction in which a partial magnet can be magnetised or in which its magnetisation is intended, and defines a first side and a second side as opposed regions at the ends of the partial magnet in respect of its length The at least two partial magnets are arranged in sequence in respect of their lengths and connected to each other. Deviations in the direction of the magnetisation and/or magnetisability of the first partial magnet deviating from the main magnetisation direction and/or main direction of magnetisability reduce and/or substantially compensate for the deviations in the direction of the magnetisation and/or magnetisability of the other or of the adjacent partial magnet deviating from the main magnetisation direction and/or main direction of magnetisability.

First claim

The invention claimed is:

1. A magnet arrangement, comprising:
at least two part-magnets, which are mechanically connected to one another, wherein the length of each part-magnet ends along the main magnetization direction of each part-magnet and/or the main magnetization direction in which a part-magnet is magnetizable or the magnetization thereof is provided, and a first side and a second side, defined as opposite regions at the ends of the part-magnet with respect to the length thereof, and wherein the at least two part-magnets are arranged one behind the other with respect to their length and are connected to one another, wherein
the at least two part-magnets are oriented relative to one another with respect to their magnetization and/or magnetizability, in that
north-south deviations in respect of a thickness of poles of one part-magnet produce and/or substantially correct north-south deviations in respect of a thickness of poles of the other or adjacent part-magnet, based on the magnetization and/or magnetizability of the entire magnet arrangement.

2. The magnet arrangement as claimed in claim 1 , wherein said magnet arrangement is designed in such a way that a total magnetic field of the magnet arrangement is formed by the orientation of the at least two part-magnets relative to one another in such a way that deviations in the magnetic fields generated by the part-magnets, based on magnetic fields which result exclusively owing to the magnetization along the magnetization direction, in interaction with the part-magnets are at least partially compensated for.

3. The magnet arrangement as claimed in claim 1 , wherein the part-magnets are formed so as to be substantially anisotropic in respect of their magnet material.

4. The magnet arrangement as claimed in claim 1 , wherein the at least two part-magnets are produced using the same die, in respect of their magnetization and/or magnetizability.

5. The magnet arrangement as claimed in claim 1 , wherein the part-magnets are each substantially cylindrical or in the form of a cylinder segment or hollow-cylindrical or right-parallelepidal or prism-shaped with a polygon as base.

6. The magnet arrangement as claimed in claim 1 , wherein each part-magnet is designed in such a way that, based on its main magnetization direction and/or main direction of its magnetizability, it has a substantially orthogonal magnetization and/or magnetizability with respect thereto, wherein
with respect to this orthogonal magnetization and/or magnetizability, one part-magnet is arranged relative to the adjoining other part-magnet so as to be rotated through an angle of between 140° and 220° , based on the length of the part-magnets.

7. A magnet arrangement, comprising:
at least two part-magnets, which are mechanically connected to one another, wherein the length of each part-magnet ends along the main magnetization direction of each part-magnet and/or the main magnetization direction in which a part-magnet is magnetizable or the magnetization thereof is provided, and a first side and a second side, defined as opposite regions at the ends of the part-magnet with respect to the length thereof, and wherein the at least two part-magnets are arranged one behind the other with respect to their length and are connected to one another, wherein
the at least two part-magnets are oriented relative to one another with respect to their magnetization and/or magnetizability, in that
deviations in respect of the direction of the magnetization and/or magnetizability of one part-magnet from the main magnetization direction and/or main direction of magnetizability produce and/or substantially correct the deviations in respect of the direction of the magnetization and/or magnetizability of the other or adjacent part-magnet from the main magnetization direction and/or main direction of magnetizability, based on the magnetization and/or magnetizability of the entire magnet arrangement, and
wherein each part-magnet is designed in such a way that one side thereof has a greater degree of anisotropic and/or aligned orientation of the magnet particles arranged in this side and/or in the region of this side and/or of the corresponding magnet material than its other side, wherein the side with the greater degree of anisotropic and/or aligned orientation of the magnet particles and/or the corresponding magnet material is defined as the strong pole of the part-magnet and, correspondingly, the side with the lower degree of anisotropic and/or aligned orientation of the magnet particles and/or of the corresponding magnet material is defined as the weak pole of the part-magnet, wherein the magnet arrangement is designed in such a way that adjacent part-magnets are oriented and arranged relative to one another in such a way that two weak poles and two strong poles of the two part-magnets adjoin one another and are connected to one another.

8. A method for producing a magnet arrangement, wherein the magnet arrangement is assembled from at least two part-magnets, which are mechanically connected to one another, wherein during or in the case of or prior to the production of the part-magnets, the magnet particles and/or the magnetic material are substantially or principally oriented in a longitudinal direction of the part-magnet, as main magnetization direction and/or main direction of magnetizability, whereafter the orientation of the magnet particles and/or the magnetic material is fixed, wherein
the at least two part-magnets are arranged relative to one another in respect of their magnetization and/or magnetizability in such a way that north-south deviations in respect of a thickness of poles of one part-magnet reduce and/or substantially correct north-south deviations in respect of a thickness of poles of the other or adjacent part-magnet, based on the magnetization and/or magnetizability of the entire magnet arrangement.

9. The method as claimed in claim 8 , wherein the at least two part-magnets are produced in the same part-magnet production die.

10. The method as claimed in claim 8 , wherein the fixing and/or cementing of the orientation of the magnet particles and/or of the magnetic material takes place by virtue of the fact that said magnetic material is pressed and/or sintered and/or baked and/or heat-treated and/or cured and/or cooled.

11. A method for producing a magnet arrangement, wherein the magnet arrangement is assembled from at least two part-magnets, which are mechanically connected to one another, wherein during or in the case of or prior to the production of the part-magnets, the magnet particles and/or the magnetic material are substantially or principally oriented in a longitudinal direction of the part-magnet, as main magnetization direction and/or main direction of magnetizability, whereafter the orientation of the magnet particles and/or the magnetic material is fixed, wherein
the at least two part-magnets are arranged relative to one another in respect of their magnetization and/or magnetizability in such a way that deviations in respect of the direction of the magnetization and/or magnetizability of one part-magnet from the main magnetization direction and/or main direction of magnetizability reduce and/or substantially correct the deviations in respect of direction of magnetization and/or magnetizability of the other or adjacent part-magnet from the main magnetization direction and/or main direction of magnetizability, based on the magnetization and/or magnetizability of the entire magnet arrangement, and
wherein once at least one first and one second part-magnet have been produced, the first and second part-magnets, as adjacent part-magnets in the magnet arrangement, are arranged one behind

Assignees

• Continental Teves Ag & Co Ohg

Inventors

• Grunwald Frank

Classifications

• B22F3/02

  Compacting only · CPC title

• H01F13/003

  Methods and devices for magnetising permanent magnets (permanent magnets H01F7/02) · CPC title

• H01F7/0278 Primary

  for generating uniform fields, focusing, deflecting electrically charged particles (for magnetic separation by Lorentz force B03C1/023; specially adapted for NMR applications G01R33/383) · CPC title

• B22F3/12

  Both compacting and sintering (by forging B22F3/17) · CPC title

• H01F7/021 Primary

  Construction of PM (H01F7/0278 takes precedence; PM compositions H01F1/032) · CPC title