(12) United States Patent Flynn

US006246561B1

(10) Patent N0.: (45) Date of Patent:

US 6,246,561 B1 Jun. 12, 2001

(54) METHODS FOR CONTROLLING THE PATH 4,688,138 * 8/1987 Nagata et al. ..................... .. 361/154 ()F MAGNETIC FLUX FROM A 4,747,010 * 5/1988 Bayer ........ .. .. 361/210

PERMANENT MAGNET AND DEVICES 4,965,695 * 10/1990 Baumann ...... .. .. 361/142 5,015,903 5/1991 Hancock et al. . 310/168

INCORPORATING THE SAME 5,155,651 * 10/1992 Yoda et al. 361/144

5,254,925 10/1993 Fl nn . . . . . . . . . . . . . . . . . .. 318/696

(75) Inventor: Charles J‘ Flynn’ Greenwood’ MO 5,268,662 12/1993 UZtsuhara etal. 335/229 (Us) 5,304,881 4/1994 Flynn et al. 310/156

_ _ _ _ _ 5,455,474 10/1995 Flynn ..... .. 310/181

(73) Asslgnee: Magnetic REVOllltlOIlS Llmlted, L-L-C, 574637263 10/1995 Flynn 310/181 51- Louis, MO (Us) 5,677,580 10/1997 Huang .. 310/44

5,710,493 1/1998 Flynn 318/254 ( * ) Notice: Subject to any disclaimer, the term of this 5,719,543 2/1998 Berling 335/229

patent is extended or adjusted under 35 5,753,990 5/1998 Flynn et a1 310/156 U_S_C_ 154(k)) by 0 days_ 5,818,680 * 10/1998 SchmitZ et al 361/160

5,822,167 * 10/1998 SchmitZ ............................. .. 361/143

(21) Appl. No.: 09/127,056 * cited by examiner

(22) Filed? Jul- 31! 1998 Primary Examiner—FritZ Fleming (51) Int. cl.7 ................................................... .. H02K 21/12 (74) Attorney) Agent) 0’ Fi’m—HaVerSt°Ck’ Garrett and

(52) US. Cl. ........................................... .. 361/147; 361/210 Roberts LLP

(58) Field of Search ................................... .. 361/143, 147, (57) ABSTRACT 361/206, 210 _ _

A permanent magnet device includes a permanent magnet (56) References Cited having north and south pole faces With a ?rst pole piece

positioned adjacent one pole face thereof and a second pole U-S~ PATENT DOCUMENTS piece positioned adjacent the other pole face thereof so as to

1 161 819 * 11/1915 Grob' create at least tWo potential magnetic ?ux paths. A ?rst 3Z13SZ88O * 6/1964 Olson et aL _ control coil is positioned along one ?ux path and a second 371847651 * 5/1965 Albosta _ control coil is positioned along the other ?ux path, each coil 3,451,055 * 6/1969 Pihl. being connected to a control circuit for controlling the 3,634,735 * 1/1972 Komatsu ............................ .. 335/234 energiZation thereof. The control coils may be energiZed in 3,670,189 6/1972 Monroe - - - - - - - - - -- 310/46 a variety of Ways to achieved desirable motive and static

376837239 * 8/1972 Sturman 335/170 devices, including linear reciprocating devices, linear 337433898 * 7/1973 Sturman """ " " 335/254 motion devices, rotary motion devices and poWer conver 3,949,250 4/1976 Walker et al. . . . . . . . . . . . .. 310/36 Sion'

4,279,008 * 7/1981 Del Picchia et al. . 361/194 4,479,162 * 10/1984 Offutt et al. ........ .. 361/210

4,528,533 7/1985 Montagu ............................ .. 335/230 42 Claims, 32 Drawing Sheets

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U.S. Patent Jun. 12, 2001 Sheet 4 0132 US 6,246,561 B1

U.S. Patent Jun. 12, 2001 Sheet 5 0132 US 6,246,561 B1

U.S. Patent Jun. 12, 2001 Sheet 7 0132 US 6,246,561 B1

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U.S. Patent Jun. 12, 2001 Sheet 8 0132 US 6,246,561 B1

276 282 296 220 286'

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U.S. Patent Jun. 12, 2001 Sheet 9 0132 US 6,246,561 B1

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U.S. Patent Jun. 12, 2001 Sheet 10 0132 US 6,246,561 B1

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U.S. Patent Jun. 12, 2001 Sheet 11 0132 US 6,246,561 B1

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U.S. Patent Jun. 12, 2001 Sheet 12 0132 US 6,246,561 B1

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U.S. Patent Jun. 12, 2001 Sheet 14 0132 US 6,246,561 B1

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U.S. Patent Jun. 12, 2001 Sheet 15 0132 US 6,246,561 B1

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U.S. Patent Jun. 12, 2001 Sheet 16 0f 32 US 6,246,561 B1

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U.S. Patent Jun. 12, 2001 Sheet 17 0132 US 6,246,561 B1

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U.S. Patent Jun. 12, 2001 Sheet 19 0132 US 6,246,561 B1

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