US3454838A - Magnetic system - Google Patents

Magnetic system Download PDF

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Publication number
US3454838A
US3454838A US613498A US3454838DA US3454838A US 3454838 A US3454838 A US 3454838A US 613498 A US613498 A US 613498A US 3454838D A US3454838D A US 3454838DA US 3454838 A US3454838 A US 3454838A
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United States
Prior art keywords
pole pieces
air gap
magnet
electromagnet
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US613498A
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English (en)
Inventor
Raymond Defain
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
CSF Compagnie Generale de Telegraphie sans Fil SA
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Filing date
Publication date
Application filed by CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
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Publication of US3454838A publication Critical patent/US3454838A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/20—Electromagnets; Actuators including electromagnets without armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/0226—PM with variable field strength

Definitions

  • This invention relates to magnetic structures of the type which includes one or more permanent magnets and two pole pieces, for example, of soft iron, secured one to each of two free ends of the magnet or magnets. More particularly, the invention is concerned with means for controlling the intensity of the magnetic field in the air gap formed by the space separating the two pole pieces.
  • a substantially xed niagnetic field configuration is required in travelling wave tubes which make use of this field either for focusing an electron beam (tubes of the so-called O-type) or for propagating au electron beam by the magnetic field associated with a perpendicular electric field (tubes of the so-called M-type).
  • the present invention consists in a device for controlling the magnetic field intensity in an air gap defined between two pole pieces of a permanent magnet structure, which device4 comprises an electromagnet disposed with its extremities adjacent the pole pieces with sheets of nonmagnetic material interposed between the electromagnet and the pole pieces, the electromagnet being energized by a controllable current source, so that the magnetic field intensity in the air gap can be controlled by the control of the current supplied to the electromagnet.
  • FIGURE l shows one embodiment of a magnetic system in accordance with the invention.
  • FIGURE 2 shows another embodiment of the invention.
  • FIGURE l shows a magnetic system which includes a U-shaped permanent magnet 1 with two mild-steel pole pieces 2 and 3, fastened respectively to each of the two extremities of magnet 1 an-d forming therewith an air gap 4.
  • the assembly 1, 2, 3 is provided with a control device comprising a U-shaped electromagnet 5, carrying a wind ing 6 energized by a current source 7 in series with a variable resistor (rheostat) 8.
  • a control device comprising a U-shaped electromagnet 5, carrying a wind ing 6 energized by a current source 7 in series with a variable resistor (rheostat) 8.
  • rheostat variable resistor
  • a suitable polarity reversal device of conventional construction such as a manual or electronic device, may be connected also between the current source 7 and its load 6.
  • sheets 9 of nonmagnetic material for example, duralumin
  • the electrical energy required for the control as supplied by the source 7 is relatively small because slight current variations in the winding 6 cause significant variations in the reluctance of the magnetic circuit of electromagnet 5, which in turn lead to variations of the ux portion of magnet 1 derived in electromagnet 5.
  • the permanent magnet had a length of 11.5 cm. and a cross-section of 20 cm2
  • the electromagnet had a length of l5 cm. and a cross-section of 7 cm?
  • FIGURE 2 shows an embodiment with two air gaps in which the field intensity is controllable in one gap and fixed in the other.
  • the right-hand portion of the structure is here effectively the same as in FIGURE l, but the U-shaped permanent magnet is replaced here by two straight bar permanent magnets 11 and 12 arranged in special parallel relationship and two pole pieces 13 and 14 between which there is defined an air gap 15.
  • the field intensity is fixed in gap 15 and controllable in gap 4.
  • a device for controlling the magnetic field intensity in an air gap between two pole pieces of a magnet structure substantially ywithout affecting the field configuration thereof comprising magnet means having two pole pieces defining therebetween an air gap, and means for controlling the magnetic field intensity in said air gap substantially without affecting the field configuration thereof including electromagnet means having two end portions placed near and operatively associated with said pole pieces.
  • control means includes means for varying the energization of said electromagnet means.
  • a device according to rclairn 2 further comprising a nonmagnetic material interposed between said end portions and adjacent surfaces of said pole pieces.
  • a device wherein said firstmentioned magnet means is a permanent magnet.
  • a device wherein said magnet means has only a single air gap which is defined between said two pole pieces.
  • said magnet means has at least two air gaps, one of said air ⁇ gaps being defined between said two pole pieces and the other air gap being defined by a further break in the structure of said magnet means.
  • control means includes means for selectively Ivarying or reversing the polarity of the energization of said electromagnet means.
  • a device further comprising a nonmagnetic material interposed between said end portions and adjacent surfaces of said pole pieces.
  • a device wherein said firstmentioned magnet means is a permanent magnet.
  • said magnet means has at least two air gaps, one of said air gaps being defined between said two pole pieces and the other air gap being defined by a further break in theA structure of said magnet means.
  • a device wherein said magnet means has only a single air gap which is defined between said two pole pieces.
  • said magnet means has at least two air gaps, one of said air gaps being defined between said two pole pieces and the other air gap being defined by a further break in the structure of said magnet means.
  • a magnet assembly in which the magnetic field intensity in an air gap defined between two pole pieces of a permanent magnet structure is adapted to be controlled, wherein the improvement icomprises an elecromagnet disposed with its extremities adjacent the pole pieces with sheets of non-magnetic material interposed between the electromagnet and the pole pieces, the electromagnet -bein'g energized by a controllable current source.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
US613498A 1966-02-18 1967-02-02 Magnetic system Expired - Lifetime US3454838A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR50200A FR1475013A (fr) 1966-02-18 1966-02-18 Dispositif de réglage pour structures à aimant permanent

Publications (1)

Publication Number Publication Date
US3454838A true US3454838A (en) 1969-07-08

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ID=8601738

Family Applications (1)

Application Number Title Priority Date Filing Date
US613498A Expired - Lifetime US3454838A (en) 1966-02-18 1967-02-02 Magnetic system

Country Status (4)

Country Link
US (1) US3454838A (fr)
DE (1) DE1589570A1 (fr)
FR (1) FR1475013A (fr)
GB (1) GB1178733A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882958A (en) * 1972-02-01 1975-05-13 Nissan Motor Collision sensor for motor vehicle safety device
US3899979A (en) * 1973-02-22 1975-08-19 Buryan Associates Magnetic suspension systems for vehicles
US3955485A (en) * 1973-10-05 1976-05-11 Roland Stasse Coffee making machine
WO2007057042A1 (fr) * 2005-11-18 2007-05-24 Santoni S.P.A. Actionneur magnetique, particulierement destine aux dispositifs de selection des machines de tricotage-chaussant ou autres

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0311294A3 (fr) * 1987-10-05 1990-08-22 THE GENERAL ELECTRIC COMPANY, p.l.c. Aimant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718606A (en) * 1952-08-02 1955-09-20 Gen Electric Combination electromagnet-permanent magnet focusing devices
US3069602A (en) * 1959-05-28 1962-12-18 Glenn M Stout Magnetic device
US3146381A (en) * 1960-09-12 1964-08-25 Vente D Aimants Allevard Ugine Magnetic force control or switching system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718606A (en) * 1952-08-02 1955-09-20 Gen Electric Combination electromagnet-permanent magnet focusing devices
US3069602A (en) * 1959-05-28 1962-12-18 Glenn M Stout Magnetic device
US3146381A (en) * 1960-09-12 1964-08-25 Vente D Aimants Allevard Ugine Magnetic force control or switching system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882958A (en) * 1972-02-01 1975-05-13 Nissan Motor Collision sensor for motor vehicle safety device
US3899979A (en) * 1973-02-22 1975-08-19 Buryan Associates Magnetic suspension systems for vehicles
US3955485A (en) * 1973-10-05 1976-05-11 Roland Stasse Coffee making machine
WO2007057042A1 (fr) * 2005-11-18 2007-05-24 Santoni S.P.A. Actionneur magnetique, particulierement destine aux dispositifs de selection des machines de tricotage-chaussant ou autres
US7770417B2 (en) 2005-11-18 2010-08-10 Santoni S.P.A. Magnetic actuator, particularly for selection devices in hosiery knitting machines or the like
CN101310059B (zh) * 2005-11-18 2014-02-26 山德霓股份公司 用于针织机的选择装置的磁致动器

Also Published As

Publication number Publication date
FR1475013A (fr) 1967-03-31
DE1589570A1 (de) 1970-03-26
GB1178733A (en) 1970-01-21

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