Antenna Arrangement For Inductive Power Transmission And Use Of The Antenna Arrangement

• US 20070126650A1
• Filed: 11/13/2006
• Published: 06/07/2007
• Est. Priority Date: 05/13/2004
• Status: Active Grant

• Current Assignee: Vacuumschmelze GmbH & Company KG (Vectra Corp.)
• Original Assignee: Vacuumschmelze GmbH & Company KG (Vectra Corp.)
• Inventors: Guenther, Wulf
• Granted Patent: US 7,545,337 B2
• Time in Patent Office: Days
• US Class Current: 343/788
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence

Abstract

An antenna arrangement for the inductive transmission of energy has magnetic cores made of a composite material with amorphous or nanocrystalline flakes and a moulded plastic material, so that the magnetic properties suitable for effective energy transmission can be adjusted at the same time as high security against fracture and a small overall height are achieved.

Claims

1. An antenna arrangement comprising a magnet core and a winding for use in the inductive power transmission, wherein the magnet core contains a soft magnetic component made of finely divided particles and a plastic component as the composite material and wherein the magnet core has an effective initial permeability ranging from 20 to 200 as well as a saturation induction higher than 0.6 T.

2. The antenna according to claim 1, wherein the soft magnetic component comprises an amorphous or a nano-crystalline material.

3. The antenna according to claim 1, wherein the soft magnetic component comprises particles which are individually insulated with a surface layer.

4. The antenna according to claim 3, wherein the particle size is less than 2 mm.

5. The antenna according to claim 3, wherein the particle thickness is less than 0.5 mm.

6. The antenna according to claim 3, wherein the surface of the particles is oxidized or plastic coated.

7. The antenna according to claim 1, wherein the plastic component comprises thermoplastic or duroplastic which can be processed with a casting resin technology.

8. The antenna according to claim 1, wherein the antenna formed by the magnet core and winding has a quality more than 50 in the frequency range from 20 kHz to 150 kHz.

9. The antenna according to claim 1, wherein the magnet core can be loaded with a magnetic flow of at least 20 μ

Wb.

10. The antenna according to claim 1, comprising several windings on the same magnet core, wherein the longitudinal axes of the windings are arranged at an angle greater than 0°

to one another.

11. The antenna according to claim 1, comprising several magnet cores that carry windings, wherein the radiation properties of the individual magnet cores are shaped and/or aligned differently.

12. The antenna according to claim 1, wherein at least one of the magnet cores has a recess for accommodating electronic components.

13. A method of using an antenna for inductive power transmission, wherein the antenna comprises a magnet core and a winding for use in the inductive power transmission, wherein the magnet core contains a soft magnetic component made of finely divided particles and a plastic component as the composite material and wherein the magnet core has an effective initial permeability ranging from 20 to 200 as well as a saturation induction higher than 0.6 T.

14. The method according to claim 13 for inductive power transmission between a stationary device and a mobile device fitted with an inductive receiver.

15. The method according to claim 14 for charging the power stores in the mobile devices.

16. The method according to claim 13 for inductive power transmission from a mobile device to a stationary device.

17. A method for operating an antenna comprising a plurality of magnet cores each carrying at least one winding, wherein the radiation properties of the individual magnet cores are shaped and/or aligned differently, wherein each magnet core contains a soft magnetic component made of finely divided particles and a plastic component as the composite material and wherein each magnet core has an effective initial permeability ranging from 20 to 200 as well as a saturation induction higher than 0.6 T, the method comprising the step of controlling different windings in a simultaneously phased manner or in an alternating manner.

18. A method for operating an antenna comprising a magnet core having a plurality of winding for use in the inductive power transmission, wherein longitudinal axes of the windings are arranged at an angle greater than 0°

to one another, and wherein the magnet core contains a soft magnetic component made of finely divided particles and a plastic component as the composite material and wherein the magnet core has an effective initial permeability ranging from 20 to 200 as well as a saturation induction higher than 0.6 T, the method comprising the step of controlling different windings in a simultaneously phased manner or in an alternating manner.