System and method for affecting flux of multi-pole magnetic structures

• US 8,957,751 B2
• Filed: 10/29/2013
• Issued: 02/17/2015
• Est. Priority Date: 12/10/2010
• Status: Expired due to Fees

• Current Assignee: Correlated Magnetics Research, LLC
• Original Assignee: Correlated Magnetics Research, LLC
• Inventors: Fullerton, Larry W., Roberts, Mark D.
• Primary Examiner(s): Ismail, Shawki S
• Assistant Examiner(s): HOMZA, LISA NHUNG
• Application Number:
  US14/066,426
• Publication Number:
  US 20140191830A1
• Time in Patent Office: 476 Days
• Field of Search: 335/296
• US Class Current: 335/296
• CPC Class Codes: H01F 3/12 Magnetic shunt paths
• CPC Class Codes: H01F 7/0205 Magnetic circuits with PM in general
• CPC Class Codes: H05K 9/00 Screening of apparatus or components against electric or magnetic fields devices for absorbing radiation from an antenna H01Q17/00

Abstract

A shunt plate is provided that is associated with a first side of a multi-pole magnetic structure. The shunt plate provides a magnetic short between opposite polarity magnetic sources on the first side of said magnetic structure, the magnetic short causing a magnetic flux of said opposite polarity magnetic sources to be routed from said first side of the magnetic structure through said magnetic structure to the second side of said magnetic structure. The thickness of the shunt plate is selected by determining the integrated flux across a magnetic source of the magnetic structure such that the corresponding flux density in the shunt plate does not substantially exceed the flux density saturation level of a cross section of the shunt plate.

Claims

1. A magnetic flux shielding system, comprising:

a magnetic structure having a first thickness, said magnetic structure comprising a plurality of magnetic sources, said plurality of magnetic sources including opposite polarity magnetic sources having an opposite polarity orientation, said magnetic structure having a first side and a second side, said second side being opposite said first side, said plurality of magnetic sources extending from said first side of said magnetic structure to said second side of said magnetic structure;

a first shunt plate associated with said first side of said magnetic structure, said first shunt plate having a second thickness less than said first thickness; and

a second shunt plate associated with said second side of said magnetic structure, said second shunt plate having a third thickness less than said first thickness, said second shunt plate being a removable shunt plate, said first shunt plate and said second shunt plate substantially shielding the flux of the magnetic structure;

wherein when said first shunt plate is in contact with said magnetic structure, said first shunt plate provides a magnetic short between opposite polarity magnetic sources on said first side of said magnetic structure, said magnetic short causing a magnetic flux of said opposite polarity magnetic sources to be routed from said first side of said magnetic structure through said magnetic structure to said second side of said magnetic structure.

2. The system of claim 1, wherein said magnetic structure comprises magnetic sources printed into a magnetizable material.

3. The system of claim 1, wherein said second thickness is less than half of said first thickness.

4. The system of claim 1, wherein said second thickness is less than one quarter of said first thickness.

5. The system of claim 1, wherein said second thickness is less than a tenth of an inch thick.

6. The system of claim 1, wherein said second thickness is less than a hundredth of an inch thick.

7. The system of claim 1, wherein said first shunt plate allows only ten percent or less leakage of magnetic flux through said first shunt plate.

8. The system of claim 1, wherein said first shunt plate is a removable shunt plate.

9. The system of claim 1, further comprising:

a spacer between said first shunt plate and said magnetic structure.

10. The system of claim 1, wherein said first shunt plate is permanently attached to said first side of said magnetic structure.

11. The system of claim 1, wherein said first shunt plate is attached magnetically, attached using an adhesive, or attached via compression as result of a fixture interfacing with said magnetic structure.

12. The system of claim 1, wherein said first shunt plate comprises a layer of metal applied to said first surface of said magnetic structure using one of a thin-film deposition technique, a vapor deposition technique, or a sputter deposition technique.

13. The system of claim 1, wherein said first shunt plate comprises a layer of metal applied to said first surface of said magnetic structure using one of an electroplating technique, a vacuum arc technique, or a plasma deposition technique.

14. The system of claim 1, wherein said first shunt plate comprises one of powdered metal sintered onto a surface of said magnetizable material or powdered metal within at least one of a paint material or an adhesive material.

15. The system of claim 1, wherein said second shunt plate is flexible.

16. The system of claim 1, further comprising:

a spacer between said second shunt plate and said magnetic structure.

17. The system of claim 16, wherein said spacer is flexible.

18. The system of claim 1, further comprising:

a storage container, wherein at least one of said first shunt plate and said second shunt plate are between said storage container and said magnetic structure.

19. The system of claim 18, wherein said storage container is a pouch.