System and method for defining magnetic structures

• US 8,368,495 B2
• Filed: 05/25/2012
• Issued: 02/05/2013
• Est. Priority Date: 04/04/2008
• Status: Active Grant

• Current Assignee: Correlated Magnetics Research, LLC
• Original Assignee: Correlated Magnetics Research, LLC
• Inventors: Fullerton, Larry W., Roberts, Mark, Richards, James Lee, Fechner, Ryan R., Loum, Kelly G.
• Primary Examiner(s): BARRERA, RAMON M
• Application Number:
  US13/481,554
• Publication Number:
  US 20120306604A1
• Time in Patent Office: 256 Days
• Field of Search: 335/285, 335/306, 243/03
• US Class Current: 335/285
• CPC Class Codes: B42F 1/00 Sheets temporarily attached together without perforating; Means therefor
• CPC Class Codes: B42F 1/06 of flat cross-section , e.g. made of a piece of metal sheet
• CPC Class Codes: G09F 7/04 the elements being secured or adapted to be secured by magnetic means
• CPC Class Codes: H01F 7/00 Magnets superconducting magnets H01F6/00; for separation of solid materials or fluids B03C1/00; for bench or like work-holders B23B31/28, B23Q3/00; work-holding devices B25B11/00; lifting magnets B66C1/00; operating or controlling locks using permanent magnets E05B47/0038; devices for holding a wing, e.g. door or window, by magnetic or electromagnetic attraction E05C19/16; relieving load or bearings using magnetic means F16C39/06 ; for electric meters G01R; for relays H01H; for electric discharge tubes H01J, e.g. H01J3/24, H01J23/10, H01J29/68 ; for dynamo-electric machines H02K
• CPC Class Codes: H01F 7/02 Permanent magnets [PM]
• CPC Class Codes: H01F 7/0242 Magnetic drives, magnetic coupling devices
• CPC Class Codes: H01F 7/0252 PM holding devices H01F7/021, H01F7/0215, H01F7/0226 take precedence
• CPC Class Codes: H01F 7/0263 Closures, bags, bands, engagement devices with male and female parts

Abstract

An improved field emission system and method. The invention pertains to field emission structures comprising electric or magnetic field sources having magnitudes, polarities, and positions corresponding to a desired spatial force function where a spatial force is created based upon the relative alignment of the field emission structures and the spatial force function. The spatial force function may be based on one or more codes. In various embodiments, the code may be modified or varied. The code may be combined with another code. One or more aspects of the code, including spacing and amplitude, may be modulated or dithered according to a predefined pattern. Multiple magnet arrays may be combined, each based on a different code or portion of a code, resulting in a combination spatial force function. Magnet structures having differing field patterns may be used to generate a desired spatial force function related to a cross correlation of the two field patterns.

Claims

1. A magnetic field force generator for producing a magnetic force profile comprising:

a first composite magnet structure comprising a first magnet array and a second magnet array;

said first magnet array based on a first magnet pattern, said second magnet array based on a second magnet pattern, said second magnet pattern differing from said first magnet pattern;

said first composite magnet structure configured for use with a complementary composite magnet structure comprising a first complementary magnet array and a second complementary magnet array, said complementary composite magnet structure being complementary to said first composite magnet structure;

said first magnet pattern comprising a sequence of two magnets having the same polarity along a direction of relative motion between said first composite magnet structure and said complementary composite magnet structure;

said first magnet pattern also comprising a sequence of three magnets having alternating polarity along said direction of relative motion.

2. The magnetic field force generator as recited in claim 1, further including said complementary composite magnet structure.

3. The magnetic field force generator as recited in claim 1, wherein said first magnet pattern is a Barker code, a maximal length PN code, a Golomb ruler code, a Gold code, a Kasami code, or a Costas array.

4. The magnetic field force generator as recited in claim 1, wherein said first magnet pattern is a discrete pattern with a fixed element width and said magnetic force profile has a single maximum peak magnitude;

wherein said magnetic force profile has a maximum magnitude, spaced from said maximum peak magnitude by at least one said element width, of less than half of said maximum peak magnitude.

5. The magnetic field force generator as recited in claim 1, wherein said first composite magnet structure has a force profile having a higher peak to sidelobe ratio than either said first magnet array or said second magnet array.

6. The magnetic field force generator as recited in claim 1, said first magnet pattern based on a code having an autocorrelation function with a single maximum peak per code modulo and a plurality of off maximum peak magnitude values;

wherein a greatest peak magnitude value of said plurality of off maximum peak magnitude values is less than one half of the single maximum peak magnitude value;

said first composite magnet structure and said complementary composite magnet structure having an operational range of relative position;

wherein magnetic force between said first composite magnet structure and said complementary composite magnet structure as a function of position within said operational range corresponds to said autocorrelation function.

7. The magnetic field force generator as recited in claim 1, wherein the first magnet array is arranged along a first circle.

8. The magnetic field force generator as recited in claim 7, wherein the second magnet array is arranged along a second circle concentric to said first circle.

9. The magnetic field force generator as recited in claim 1, wherein the first magnet array is a linear array.

10. The magnetic field force generator as recited in claim 1, wherein the second magnet array differs in polarity from the first magnet array.

11. The magnetic field force generator as recited in claim 1, wherein the second magnet array differs in direction from the first magnet array.

12. The magnetic field force generator as recited in claim 1, wherein the second magnet array is parallel to the first magnet array.

13. The magnetic field force generator as recited in claim 1, wherein the second magnet array shares at least one magnet with the first magnet array.

14. The magnetic field force generator as recited in claim 1, wherein the first magnet pattern has a length of at least four.

15. The magnetic field force generator as recited in claim 1, wherein the first magnet pattern has a length of at least five.

16. The magnetic field force generator as recited in claim 1, wherein the second magnet array is configured to equalize the magnitudes of opposite polarities of the magnets of the first composite magnet structure, thereby reducing a far field magnetic field from the first composite magnet structure.

17. The magnetic field force generator as recited in claim 1, further including a second composite magnet structure spaced from said first composite magnet structure in fixed relationship to said first composite magnet structure;

said second composite magnet structure for cooperating with a second complementary composite magnet structure to produce said force profile.

18. A magnetic field force generator for producing a magnetic force profile comprising:

a first compound magnet structure comprising a plurality of magnet arrays;

at least one array of said plurality of magnet arrays comprising magnets configured according to a first pattern;

said plurality of magnet arrays configured according to a second pattern;

said first compound magnet structure configured for operation with a complementary compound magnet structure complementary to said first compound magnet structure.

said first pattern defining a sequence of at least two magnets having the same polarity along a direction of relative motion between said first compound magnet structure and said complementary compound magnet structure;

said first pattern also defining a sequence of at least three magnets having alternating polarity along said direction of relative motion.

19. The magnetic field force generator as recited in claim 18, wherein said second pattern defines, at least in part, a polarity of each array of said plurality of magnet arrays.

20. A magnetic field force generator for producing a magnetic force profile comprising:

a first composite magnet structure comprising a first magnet array and a second magnet array;

said first magnet array based on a first pattern, said second magnet array based on a second pattern, said second pattern differing from said first pattern;

said first composite magnet structure configured for use with a complementary composite magnet structure comprising a first complementary magnet array and a second complementary magnet array, said complementary composite magnet structure complementary to said first composite magnet structure;

wherein said first composite magnet structure has a force profile having a higher peak to sidelobe ratio than either said first magnet array or said second magnet array.

21. A magnetic field force generator for producing a magnetic force profile comprising:

a first magnet structure comprising a first plurality of magnets;

said first plurality of magnets arranged according to a first magnet pattern;

a second magnet structure comprising a second plurality of magnets;

said second magnet structure arranged based on a second magnet pattern;

said second magnet pattern differing from said first magnet pattern, said second magnet pattern differing from a complementary pattern to said first magnet pattern;

said first magnet pattern comprising a sequence of at least two magnets having the same polarity along a direction of relative motion between said first magnet structure and said second magnet structure;

said first magnet pattern also comprising a sequence of at least three magnets having alternating polarity along said direction of relative motion.