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DE-102024210899-A1 - Rotor for an axial flux machine, axial flux machine and vehicle

DE102024210899A1DE 102024210899 A1DE102024210899 A1DE 102024210899A1DE-102024210899-A1

Abstract

The invention relates to a rotor (3) with the features of claim 1, an axial flux machine (2) with the features of claim 15 and a vehicle (1) with the features of claim 16.

Inventors

  • Armin Hollstein
  • Andreas Ederer
  • Jürgen Bohmann
  • Ferdinand Löbbering
  • Martin Brüll

Assignees

  • Schaeffler Technologies AG & Co. KG

Dates

Publication Date
20260513
Application Date
20241113

Claims (16)

  1. Rotor (3) for an axial flux machine (2), which has a rotational axis (4) about which the rotor (3) is rotatable, wherein the rotor (3) has permanent magnets (7) on an end face (A) of the rotor (3) which extends transversely to the axis of rotation (4), wherein the permanent magnets (7) on the end face (A) are attached to the rotor (3), in particular to a magnet yoke (6) of the rotor (3), preferably indirectly, wherein the attachment preferably comprises at least a positive locking, in particular at least a crimping.
  2. Rotor (3) after Claim 1 , characterized in that the fastening further comprises a magnetic holder (5), in particular a cover plate, which holds and/or positions and/or centers the permanent magnets (7), in particular in a form-fitting and/or force-fitting manner, preferably directly, preferably by clamping the permanent magnets (7) against the magnetic yoke (6) by the magnetic holder (5), in particular the cover plate.
  3. Rotor (3) after Claim 2 , characterized in that the magnet holder (5), in particular the cover plate, is attached by means of at least one positive locking, in particular to the rotor (3) or the magnet yoke (6), preferably directly.
  4. Rotor (3) according to one of the preceding claims, characterized in that the at least one positive locking connection is formed by means of a radially outer edge (8) of the magnet holder (5), in particular the cover plate, and/or a radially inner edge (9) of the magnet holder (5), in particular the cover plate.
  5. Rotor (3) after Claim 4 , characterized in that the radially inner edge and/or the radially outer edge (8, 9) engages behind the rotor (3) or the magnet yoke (6), in particular viewed from the end face (A) and thereby forms at least one positive locking connection.
  6. Rotor (3) according to one of the preceding claims, characterized in that the radially inner edge (9) is formed on a cylindrical section of the magnet holder (5), in particular the cover disk, and that the cylindrical section (11) extends through an opening of the magnet yoke (6) through the magnet yoke (6).
  7. Rotor (3) after Claim 6 , characterized in that the cylindrical section (11) forms a centering of the magnet holder (5), in particular the cover disk, and/or permanent magnets (7) to the rotor (3), in particular to the magnet yoke (6).
  8. Rotor (3) according to one of the preceding claims, characterized in that the magnet holder (5), in particular the cover disk, positions the permanent magnets (7) in a form-fitting manner, in particular in the radial direction (12b) and/or in the circumferential direction.
  9. Rotor (3) according to one of the preceding claims, characterized in that the magnet holder (5), in particular the cover plate, has openings in the area of the permanent magnets (7) which extend from the permanent magnets (7), in particular parallel to the axis of rotation (4), through the magnet holder (5), in particular the cover plate, away from the magnet yoke (6).
  10. Rotor (3) according to one of the preceding claims, characterized in that the magnet holder (5), in particular the cover plate, has pockets for receiving the permanent magnets (7) in which the permanent magnets (7) are received, and that the permanent magnets (7) preferably have a retaining contour which interacts with a counter-retaining contour of the magnet holder (5), in particular the cover plate, to hold the permanent magnets (7).
  11. Rotor (3) according to one of the preceding claims, characterized in that the magnet holder (5), in particular the cover disk, and the rotor (3), in particular the magnet yoke (6), form an alignment positive connection with each other, which allows only a single and/or specific connection position between the magnet holder (5), in particular the cover disk, and the rotor (3), in particular the magnet yoke (6), which corresponds to a predetermined position, preferably a target position, of the permanent magnets (7) in relation to the rotor (3), in particular the magnet yoke (6).
  12. Rotor (3) according to one of the preceding claims, characterized in that the magnet holder (5), in particular the cover plate, is attached to the rotor (3) or magnet yoke (6) by means of a fastening element (10) formed separately from the magnet holder (5), in particular from the cover plate, in particular by means of at least one positive locking.
  13. Rotor (3) after Claim 12 , characterized in that the fastening element (10) is designed as a positive locking element, in particular a flange element, by means of which at least one positive locking element, in particular the flange, is formed.
  14. Rotor (3) according to one of the preceding claims, characterized in that the The magnetic holder (5), in particular the cover plate, and/or the form-locking element, in particular the crimping element, comprises metal and/or plastic.
  15. Axial flux machine (2) with at least one rotor (3) according to one of the preceding claims.
  16. Vehicle (1) with an axial flux engine (2) to Claim 15 or at least one rotor (3) after one of the Claims 1 until 14 .

Description

Technical field The invention relates to a rotor for an axial flux machine, an axial flux machine and a vehicle. State of the art Rotors in electric machines containing permanent magnets are known from the prior art. However, at high rotational speeds, there is a risk that the permanent magnets will detach from the rotor due to the associated centrifugal forces. Description of the invention, problem, solution, advantages Therefore, the object of the present invention is to provide an alternative rotor which, in particular, overcomes at least some of the aforementioned disadvantages of the prior art. Furthermore, an object is to provide an axial flux machine with such a rotor, as well as a vehicle with such an axial flux machine or such a rotor. The problem with regard to the rotor is solved by a device having the features of claim 1. The further problems are solved by a device having the features of claim 15 and a device having the features of claim 16, respectively. One embodiment of the invention relates to a rotor for an axial flux machine, which has an axis of rotation about which the rotor is rotatable. The rotor has permanent magnets on an end face of the rotor that extends transversely to the axis of rotation. The permanent magnets on the end face are attached to the rotor, preferably indirectly, by means of a fastening, in particular to a magnet yoke of the rotor. The fastening preferably comprises at least one positive fit, in particular at least one crimp. This provides a particularly reliable fastening of the permanent magnets to the rotor. Alternatively to a positive fit, the fastening can comprise a friction fit or a material fit. In other words, positive-fit, friction-fit, or material-fit fastenings are conceivable. An adhesive bond, a riveted connection, or a screwed connection would be possible. The axial flux machine is preferably an electric motor. It is particularly advantageous if the permanent magnets can be detached from the rotor without damage. This is preferably achieved by making the fastening or the at least one positive locking mechanism, preferably the at least one crimp, detachable either destructively or non-destructively. A previous or preferred embodiment is characterized in that the fastening further comprises a magnet holder, in particular a cover plate, which holds and/or positions and/or centers the permanent magnets, in particular by positive locking and/or frictional locking, preferably directly, preferably by clamping the permanent magnets against the magnet yoke by the magnet holder, in particular the cover plate. In other words, the magnet holder is preferably attached directly to the magnet yoke by means of the fastening or the at least one positive locking, in particular the at least one crimp, while the permanent magnets are held by means of the magnet holder on the rotor or on the magnet yoke, in particular by means of a clamp, preferably a clamp between the rotor or magnet yoke on the one hand and the magnet holder on the other. In other words, it is preferred if the fastening serves only as an indirect fastening of the permanent magnets to the rotor or the magnet yoke. The magnetic holder allows the permanent magnets to be held preferably in a predetermined target position. It is also preferable if the magnetic holder is pre-tensioned against the magnetic yoke. This increases the clamping force. Preferably, the magnet holder is designed in such a way that the centrifugal forces acting on the permanent magnets due to a rotation of the rotor can be absorbed by means of the magnet holder. One of the previous embodiments or a further preferred embodiment is characterized in that the magnet holder, in particular the cover plate, is attached by means of at least one positive locking mechanism, in particular to the rotor or the magnet yoke, preferably directly. One of the preceding embodiments or a further preferred embodiment is characterized in that the at least one positive locking connection is formed by means of a radially outer edge of the magnet holder, in particular the cover plate, and/or a radially inner edge of the magnet holder, in particular the cover plate. The radially outer edge of the magnet holder is preferably located transversely to the first The direction of rotation is spaced apart from the radially inner edge of the magnet holder. The radially inner edge of the magnet holder is preferably located closer to the axis of rotation than the radially outer edge of the magnet holder. In particular, a direction extending radially outwards is either transverse or perpendicular to the axis of rotation, away from the axis of rotation. One of the previous embodiments or a further preferred embodiment is characterized in that the radially inner edge and/or the radially outer edge engages behind the rotor or the magnet yoke, in particular viewed from the end face, thereby forming the at least one positive fit or the flanging. One of the previous embodiments