Cross-flow fan

Patent metadata

Field	Value
Publication number	US-12104602-B2
Application number	US-202217579733-A
Country	US
Kind code	B2
Filing date	Jan 20, 2022
Priority date	Feb 18, 2021
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

A cross-flow fan includes a cylindrical impeller having an annularly designed first magnetically effective core disposed at a first end, an annularly designed second magnetically effective core disposed at a second end, a plurality of vanes arranged between the first magnetically effective core and the second magnetically effective core, a first stator, which is a bearing and drive stator, and which interacts with the first magnetically effective core as a first electromagnetic rotary drive, and a second stator, which is at least a bearing stator, and with which the second magnetically effective core is capable of being magnetically levitated without contact with respect to the second stator. The impeller is magnetically driven without contact by the first and the second stators and magnetically levitated without contact with respect to the first stator and the second stator.

First claim

What is claimed:

1. A cross-flow fan for generating a fluid flow, comprising:
a cylindrical impeller extending in an axial direction from a first end to a second end, the cylindrical impeller including an annularly designed first magnetically effective core disposed at the first end, an annularly designed second magnetically effective core disposed at the second end, a plurality of vanes, each of the plurality of vanes being arranged between the first magnetically effective core and the second magnetically effective core with respect to the axial direction, and extending in the axial direction from a sheath, the sheath enclosing the magnetically effective core and configured to reduce eddy current losses;
a first stator, which is a bearing and drive stator, and which interacts with the first magnetically effective core as a first electromagnetic rotary drive; and
a second stator, which is at least a bearing stator, and with which the second magnetically effective core is capable of being magnetically levitated without contact with respect to the second stator,
the impeller configured to be magnetically driven without contact by the first and the second stators and to be magnetically levitated without contact with respect to the first stator and the second stator, the first stator arranged within the first magnetically effective core such that the first magnetically effective core surrounds the first stator, the first and second magnetically effective cores being configured to interact magnetically with the first and second stators to generate torque and generate forces for magnetic levitation.

2. The cross-flow fan according to claim 1 , wherein the second stator is a bearing and drive stator configured to interact with the second magnetically effective core as a second electromagnetic rotary drive to exert a torque on the second magnetically effective core, and the second stator is arranged within the second magnetically effective core such that the second magnetically effective core surrounds the second stator.

3. The cross-flow fan according to claim 1 , wherein the first stator is encapsulated in a first stator housing of a low-permeable material, and the second stator is encapsulated in a second stator housing of a low-permeable material.

4. The cross-flow fan according to claim 1 , wherein the first stator includes a first stator housing and second stator includes a second stator housing, and first and second controllers configured to control or regulate a respective stator of the first and second stators is disposed in the first stator housing and second stator housing, respectively.

5. The cross-flow fan according to claim 4 , wherein each of the first and second stator housings has a first housing portion and a second housing portion, and the first housing portion is arranged within the impeller and is surrounded by one of the first and second magnetically effective cores of the impeller, and the second housing portion has an outer diameter which is at least as large as an outer diameter of the one of the magnetically effective cores.

6. The cross-flow fan according to claim 5 , wherein each of the first and second controllers is arranged in the second housing portion of the first and second stator housings, respectively.

7. The cross-flow fan according to claim 1 , wherein the impeller is designed without a shaft.

8. The cross-flow fan according to claim 1 , wherein each of the first and second stators comprises a plurality of coil cores, each of which extends in a radial direction, and each coil core carries exactly one concentrated winding.

9. The cross-flow fan according to claim 7 , wherein a number of the plurality of coil cores for each of the first and second stators is exactly three, or exactly four, or exactly five, or exactly six.

10. The cross-flow fan according to claim 1 , wherein each of the first and second magnetically effective cores of the impeller comprises a plurality of permanent magnets.

11. The cross-flow fan according to claim 10 , wherein each permanent magnet of the plurality of permanent magnets is a ring segment, and the plurality of permanent magnets of each of the first and second magnetically effective cores complement each other to form a ring.

12. The cross-flow fan according to claim 10 , wherein each permanent magnet of the plurality of permanent magnets is magnetized in a radial direction, and permanent magnets of the plurality of permanent magnets arranged adjacent to each other in a circumferential direction are each oppositely magnetized.

13. The cross-flow fan according to claim 10 , wherein a number of permanent magnets of the plurality of permanent magnets for each of the first and second magnetically effective cores is exactly four, or exactly eight, or exactly ten, or exactly twelve.

14. The cross-flow fan according to claim 4 , wherein a thermal protection layer is provided in each of the first and second stator housings between the first and second stators and the first and second controllers, respectively.

15. The cross-flow fan according to claim 1 , wherein each of the first and second stators is coolable.

16. The cross-flow fan according to claim 3 , wherein the first stator housing comprises a first housing portion which is arranged within the impeller.

Assignees

• Levitronix Gmbh

Inventors

• Steinert Daniel
• Holenstein Thomas
• Bagaric Ivana

Classifications

• F04D29/048

  magnetic; electromagnetic · CPC title

• F04D25/0646

  Details of the stator · CPC title

• F04D25/0633

  Details of the magnetic circuit · CPC title

• H01S3/225

  comprising an excimer or exciplex · CPC title

• H02K7/09

  with magnetic bearings · CPC title