Rotor for a planar drive system and planar drive system

Patent metadata

Field	Value
Publication number	US-12580441-B2
Application number	US-202318505311-A
Country	US
Kind code	B2
Filing date	Nov 9, 2023
Priority date	May 11, 2021
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

A rotor for a planar drive system comprises a housing and at least one magnet arrangement. The housing comprises a basic housing body and a cover. The magnet arrangement is arranged in a recess of the basic housing body. The cover is attached to the basic housing body in such a way that the housing is configured to be fluid-tight, the cover covers the recess, and the magnet arrangement is arranged in an interior of the fluid-tight housing.

First claim

The invention claimed is:

1 . A rotor having:
a housing, and at least one magnet arrangement; the housing comprising a basic housing body and a cover, and the magnet arrangement being arranged in a recess of the basic housing body; wherein the cover is attached to the basic housing body in such a way that the housing is configured to be fluid-tight, the cover covers the recess and the magnet arrangement is arranged in an interior of the fluid-tight housing; wherein the basic housing body and the cover have a metallic configuration, and wherein the cover and the basic housing body are laser-welded, wherein a laser-welded joint is circumferentially arranged between the basic housing body and the cover in an edge region of the housing.

2 . The rotor according to claim 1 , wherein the cover is non-magnetic.

3 . The rotor according to claim 1 , wherein the cover has a relative magnetic permeability of less than ten, less than two, or less than 1.01.

4 . The rotor according to claim 1 , wherein the cover attenuates a magnetic field of the magnet arrangement outside of the housing by a maximum of 25 percent, or by a maximum of 10 percent.

5 . The rotor according to claim 1 , wherein the cover comprises a metal sheet, wherein a metal sheet thickness of the metal sheet is between 0.05 and 0.5 millimeters, between 0.09 and 0.11 millimeters, or about 0.1 millimeters.

6 . A rotor comprising:
a housing, and at least one magnet arrangement; the housing comprising a basic housing body and a cover, and the at least one magnet arrangement being arranged in a recess of the basic housing body; wherein the cover is attached to the basic housing body such that the housing is configured to be fluid-tight, wherein the cover covers the recess and the at least one magnet arrangement is arranged in an interior of the fluid-tight housing; and wherein the basic housing body and the cover comprise a plastic, and wherein the cover and the basic housing body are laser-welded.

7 . A rotor comprising:
a housing, and at least one magnet arrangement; the housing comprising a basic housing body and a cover, and the at least one magnet arrangement being arranged in a recess of the basic housing body; wherein the cover is attached to the basic housing body such that the housing is configured to be fluid-tight, wherein the cover covers the recess and the at least one magnet arrangement is arranged in an interior of the fluid-tight housing; and wherein the interior of the fluid-tight housing is at least partially evacuated.

8 . The rotor according to claim 7 , wherein an evacuating device is attached to the housing, wherein the evacuating device comprises a welded or soldered pipe.

9 . A rotor having:
a housing, and at least one magnet arrangement; the housing comprising a basic housing body and a cover, and the at least one magnet arrangement being arranged in a recess of the basic housing body; wherein the cover is attached to the basic housing body such that the housing is configured to be fluid-tight, wherein the cover covers the recess and the at least one magnet arrangement is arranged in an interior of the fluid-tight housing; and wherein the interior of the fluid-tight housing is at least partially filled with a casting compound.

10 . The rotor according to claim 9 , wherein the interior of the fluid-tight housing is potted with a PU casting compound in a substantially bubble-free manner.

11 . The rotor according claim 1 , wherein the interior of the fluid-tight housing is substantially free of water.

12 . The rotor according to claim 1 , wherein the magnet arrangement is configured for interacting with a stator magnetic field and thereby driving the rotor.

13 . A planar drive system having:
at least one stator module; wherein the stator module comprises at least one stator assembly with at least one coil arrangement, wherein the coil arrangement is energizable and is arranged to generate a stator magnetic field above a stator surface due to an energization, wherein the planar drive system further comprises a rotor, wherein the rotor is movable above the stator surface via of an interaction between the stator magnetic field and a rotor magnetic field of the magnet arrangement, wherein the planar drive system further comprises a separating device, wherein the separating device is arranged above the stator surface, and wherein the stator module is arranged on a first side of the separating device and the rotor is arranged on a second side of the separating device; and wherein the separating device is part of an operating housing, the rotor being movable within the operating housing.

14 . The planar drive system according to claim 13 , wherein the separating device is non-magnetic.

15 . The planar drive system according to claim 13 , wherein the separating device has a relative magnetic permeability smaller than ten, smaller than two or smaller than 1.01.

16 . The planar drive system according to claim 13 , wherein the separating device is between 0.5 and 1 millimeter thick.

17 . The planar drive system according to claim 13 , wherein the operating housing comprises a first vacuum chamber.

18 . The planar drive system according to claim 17 , wherein the stator module is arranged within a second vacuum chamber, wherein the separating device separates the first vacuum chamber from the second vacuum chamber.

19 . The planar drive system according to claim 18 , wherein an equalizing valve is arranged between the first vacuum chamber and the second vacuum chamber, wherein the equalizing valve is arranged to equalize a pressure difference between the first vacuum chamber and the second vacuum chamber when the pressure difference is larger than 5 millibars.

20 . The planar drive system according to claim 19 , wherein the equalizing valve is configured as a pressure relief valve.

21 . The planar drive system according to claim 20 , wherein the equalizing valve is configured as a controlled valve, wherein a valve control is connected to a first pressure sensor of the first vacuum chamber and to a second pressure sensor of the second vacuum chamber.

22 . The planar drive system according to claim 18 , wherein the stator module is connected to a vacuum duct, the vacuum duct being set up to provide a data connection and a current supply to the stator module from outside of the second vacuum chamber.

23 . The planar drive system according to claim 22 , wherein the vacuum duct comprises a printed circuit board, the printed circuit board being part of a wall of the second vacuum chamber, the printed circuit board comprising pins for current feedthrough and vias for data connection.

24 . The planar drive system according to claim 17 , wherein the first vacuum chamber is configured to be evacuated via a backing pump and a turbopump.

25 . A planar drive system comprising:
a rotor, the rotor comprising a basic housing body with a recess, at least one magnet arrangement being arranged in the recess, and a cover adapted to the basic housing body in such a way that a housing is formed by the basic housing body and the cover, the housing being configured to be fluid-tight, and a magnet arrangement arranged in an interior of the fluid-tight housing; wherein the rotor is disposed in a vacuum during attachment of the cover or the rotor is heated to more than 100 degrees Celsi

Assignees

• Beckhoff Automation Gmbh

Inventors

• Prüssmeier Uwe
• Neufeld Jörg
• Beckhoff Johannes
• Schulte Felix

Classifications

• H02K2201/18

  Machines moving with multiple degrees of freedom · CPC title

• H02K41/031 Primary

  of the permanent magnet type · CPC title

• H02K2203/03

  Machines characterised by the wiring boards, i.e. printed circuit boards or similar structures for connecting the winding terminations · CPC title

• H02K5/132

  Submersible electric motors (H02K5/128 takes precedence) · CPC title

• H02K5/225

  Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132) · CPC title