US3577107A - Ac operated magnet - Google Patents

Ac operated magnet Download PDF

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Publication number
US3577107A
US3577107A US797583A US3577107DA US3577107A US 3577107 A US3577107 A US 3577107A US 797583 A US797583 A US 797583A US 3577107D A US3577107D A US 3577107DA US 3577107 A US3577107 A US 3577107A
Authority
US
United States
Prior art keywords
laminated iron
armature
core member
plastic
core
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
Application number
US797583A
Other languages
English (en)
Inventor
Gerhard Widl
Kurt Groetzner
Adolf Knodler
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE19681639210 external-priority patent/DE1639210A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3577107A publication Critical patent/US3577107A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/088—Electromagnets; Actuators including electromagnets with armatures provided with means for absorbing shocks
    • 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
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/10—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current
    • H01F7/12—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current having anti-chattering arrangements

Definitions

  • the present invention resides in an AC electromagnet or solenoid applicable particularly for the actuation of hydraulic valves.
  • the AC electromagnet or solenoid has an armature and a core constructed of laminated ferromagnetic material.
  • a particular advantageous embodiment of the present invention results when the laminated section or unit is subdivided into as least two adjacent and identical laminated sections.
  • a plastic intermediate layer or layer of synthetic material separates the two identical sections. This construction diminishes the required pressure to be applied for holding together the laminations of the armature and/or the core.
  • the plastic intermediate layer of the annature and/or core is designed so that the surface of impact between the armature and the core has damping characteristics.
  • the laminated elements are furthermore particularly well held together through the provision of at least one bore running vertical to the planes of the laminated elements of the armature and/or core.
  • An elastic metallic member, preferably of rolled spring steel, and in the form of a stress resisting rod is inserted into the bore and covered or molded-over with plastic material.
  • An AC operated magnet in which the core member and the armature are both of laminated iron.
  • a plasticcasing or covering surrounds at least partially either or both the core and the armature which is movable relative to the core.
  • a plastic intermediate layer subdivides the armature and/or the core into at least two identical sections, and may be approximately twice as thick as the jacket or casing surrounding the outer rim of the armature or core.
  • Elastic deformable plastic elements are inserted into the impact surfaces of the armature and/or the core to decrease the impact effects when the armature is actuated.
  • FIG. I is an isometric view of an actuating magnet or solenoid which is subdivided into laminated sections through an intermediate plastic layer, in accordance with the present in- ,vention;
  • FIG. 6 is a sectional view of the annature taken along lines Vl-Vl in FIG. 4;
  • FIG. 7 is a sectional view of an embodiment of the arms ture, in accordance with the present invention, and shows the design in which only one stress takeup or supporting rod abutting an injection molded actuating rod;
  • FIG. 7a is a sectional view of another embodiment of the armature.
  • FIG. 8 is an isometric view of a core of a magnet, and shows an embodiment for admitting two through-bolts into openings provided in the core.
  • a core member 12 consists of laminated sheet metal embedded in plastic material. Bores 13 on both sides of the core run along the legs of the core, as shown in FIG. 8. These bores are symmetrically located with respect to the central axis of the magnet. The bores lie outside of the striking or actuating region of the armature 14.
  • the movable armature 14 functions in conjunction with the core 12.
  • the bores 13 are directed along the axial direction of the magnet, and lie within an intermediate plastic portion 15 which subdivides the laminated structure 16 of the core 12 into two neighboring sections and 16 b.
  • the two laminated sections 16a and 16b are of identical design and construction.
  • the laminated construction of the armature I4 is separated into two identical laminated sections 18a and 18b, through a plastic intermediate layer or portion 17.
  • the intermediate portion 15 for example, is as thick as either the section 16a and 16b, while the intermediate plastic portion 17 is as thick as either the section I 8a or 18b.
  • These intermediate plastic portions 15 and [7 connect with the neighboring surfaces of the armature and the core with their associated laminated sections, similar to the bordering portions 19 and 20, also made of plastic material.
  • An actuating rod 21 is inserted in the plastic intermediate layers 17 of the armature 14. This actuating rod projects with a portion 22 out of the armature and in the direction for attracting the armature by the core. This portion 22 of the actuating rod 21 extends into an opening 23 provided within the intermediate plastic layer 15 of the core 12. It is the purpose of this extending portion 22 to actuate a hydraulic valve, not shown. With its opposite end or portion 24, the actuating rod 21 passes through the housing of the magnetic system, not shown, so that the valve may also be manually actuated in the event that this becomes necessary. This construction is shown in FIGS. 1 and 2,
  • FIG. 3 shows an armature with an actuating rod 21 which has only a projecting end portion 22 for extending into the core and the-baseplate.
  • a rubber ring 25 lies around the actuating rod 21 in the region where the rod exits from the armature. This rubber ring prevents fracture of the plastic material as a result of small deflections of the rod or inclinations of the rod in this particular region.
  • FIG. 4 illustrates an embodiment of an actuating magnet or solenoid in which the laminated section 16 of the core 12 is not subdivided or separated through a plastic intermediate layer.
  • recesses 26 are provided about the outer side surface s.
  • An actuating rod 27 is held within the baseplate l supporting rods 30 are provided in bores 31 perpendicular to the layer planes of the laminations.
  • These shear supporting 'rods 30. are inserted into bores and are covered with plastic material. When the armature strikes the core, the resulting shear stresses or shear forces that arise from this action, are largely taken up by these shear supporting rods 30. The locations and designs of these rods are shown in H65. 5 and 6.
  • FIG. 7 shows an annature design in which recesses 32 and 33 are provided in the striking portion or impact portion of the armature which strikes or contacts the core.
  • These recesses 32 and 33 are filled with plastic material for the purpose of in creasing the elastic properties of this contact portion of the armature, and to prevent damage to the relatively thin rim 19, when the armature comes into contact with the core.
  • the plastic inserts 32 and 33 serve to protect the surface of the armature when striking the core, after becoming actuated.
  • the armature 14, shown in FIG. 7a is exactly like the armature shown in FIG. 7, except that the recesses 33, filled with a synthetic plastic material, have a shape that is different from the recesses 32.
  • the plastic material used in the design of the aforementioned embodiments are formed through injection molding techniques, and are of nylon reinforced with glass fibers, known in the art as Nylafil G l0/40.
  • magnets in which the laminated elements are held in place through elastic deformable plastic covering have more resistance to shear forces than magnets with soldered iron cores. This applies even to the condition when the plastic surrounding the laminated sections and elements are of relatively small quantity or mass.
  • plastic covered iron cores furthermore, the cohesion of the laminations is further improved, since the plastic penetrates through bores 31 in the laminations or laminated sections.
  • the lifespan of the AC- magnets, in accordance with the present invention is also considerably increased through the presence of the elastic and flexible shear supporting rods or stress rods in-- .serted into the bores 31 and covered or molded over with plastic. These stress takeup rods take up the shear forces which arise in the operation of the magnet.
  • the plastic intermediate layer as well as the plastic surrounding covering provides damping effects of the armature impact in striking the core.
  • An AC operated magnet comprising, in combination, a core member of laminated iron; an armature member of laminated iron and movable relative to said core member; a plastic casing covering at least partially one of said members; and plastic means filled in recesses of said armature member and exposed to the impact surface between said armature and said core member, said impact surface being a surface along which said armature member strikes said core member when said magnet is actuated.
  • An AC operated magnet comprising, in combination, a core member of laminated iron; an armature member of laminated iron and movable relative to said core member; a plastic casing means covering at least partially one of said members; a plastic intermediate layer for subdividing the laminated iron in at least one of said members into at least two identical sections; and actuating rod means projecting from said intermediate layer means of said armature member and passing through an opening in said core member, said opening being through a plastic intermediate layer in said core member subdividing said laminated iron into at least two sections in said core member.
  • An AC operated magnet comprising, in combination, a core member of laminated iron; an armature member of laminated iron and movable relative to said core member; a plastic casing covering at least partially one of said members; at least one stress takeup member in an opening perpendicular to the planar surfaces of said laminated iron of at least one of said members, said stress takeup member being of elastic metallic substance.
  • An AC operated magnet comprising, in combination, a core member of laminated iron; an armature member of laminated iron and moveable relative to said core member; a plastic casing covering at least partially one of said members; at least one stress takeup member in an opening perpendicular to the planar surfaces ofsaid laminated iron of at least one of said members; and plastic means covering said stress takeup means.
  • An AC operated magnet comprising, in combination, a core member of laminated iron; an armature member of laminated iron and movable relative to said core member; plastic casing means covering said members for holding the laminations of said laminated iron in assembled position; elastic deformable plastic layers on said armature member and said core member between the surfaces of impact of said armature member and of said core member; and plastic means in at least one recess perpendicular to the planar surfaces of said laminated iron of at least one of said members.
  • An AC operated magnet comprising, in combination, a core member of laminated iron; an armature member of laminated iron and movable relative to said core member; plastic casing means covering said members for holding the laminations of said laminated iron in assembled position; elastic deformable plastic layers on said armature member and said core member between the surfaces of impact of said armature member and of said core member; and at least one stress takeup member in an opening perpendicular to the planar surfaces of said laminated iron of a least one of said members.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Magnetically Actuated Valves (AREA)
US797583A 1968-02-28 1969-02-07 Ac operated magnet Expired - Lifetime US3577107A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681639210 DE1639210A1 (de) 1968-02-28 1968-02-28 Wechselstrommagnet,insbesondere zur Betaetigung von Hydraulikventilen

Publications (1)

Publication Number Publication Date
US3577107A true US3577107A (en) 1971-05-04

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ID=5683981

Family Applications (1)

Application Number Title Priority Date Filing Date
US797583A Expired - Lifetime US3577107A (en) 1968-02-28 1969-02-07 Ac operated magnet

Country Status (3)

Country Link
US (1) US3577107A (de)
FR (1) FR1592884A (de)
GB (1) GB1255411A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5010312A (en) * 1990-04-10 1991-04-23 Rostra Engineered Components Solenoid actuators
US5453821A (en) * 1988-11-23 1995-09-26 Datacard Corporation Apparatus for driving and controlling solenoid impact imprinter
US5947442A (en) * 1997-09-10 1999-09-07 Cummins Engine Company, Inc. Solenoid actuated valve assembly
US6049264A (en) * 1997-12-09 2000-04-11 Siemens Automotive Corporation Electromagnetic actuator with composite core assembly
US20030189473A1 (en) * 2002-04-05 2003-10-09 Moeller Gmbh AC electromagnet
US20060017535A1 (en) * 2004-07-26 2006-01-26 Denso Corporation Linear solenoid designed to ensure required amount of magnetic attraction and solenoid valve using same
US20070069172A1 (en) * 2005-04-26 2007-03-29 Parker-Hannifin Corporation Magnetic repulsion actuator and method
US20070290779A1 (en) * 2006-06-14 2007-12-20 Datacard Corporation Laminated solenoid plunger for solenoid assembly
US20110050376A1 (en) * 2009-08-27 2011-03-03 Vacuumschmelze Gmbh & Co., Kg Laminate Stack Comprising Individual Soft Magnetic Sheets, Electromagnetic Actuator, Process for Their Manufacture and Use of a Soft Magnetic Laminate Stack
US20130181156A1 (en) * 2011-08-26 2013-07-18 Drazen Boban Hydraulic transmission valve

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2665021B1 (fr) * 1990-07-20 1994-09-09 Telemecanique Appareil contacteur ayant un electro-aimant dont les pieces fixe et mobile sont surmoulees par un revetement.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2370752A (en) * 1942-02-23 1945-03-06 William A Ray Electromagnetically operated valve
US2715199A (en) * 1952-01-23 1955-08-09 Etc Inc Solenoid
US3042842A (en) * 1958-04-14 1962-07-03 Cutler Hammer Inc Electromagnetic device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2370752A (en) * 1942-02-23 1945-03-06 William A Ray Electromagnetically operated valve
US2715199A (en) * 1952-01-23 1955-08-09 Etc Inc Solenoid
US3042842A (en) * 1958-04-14 1962-07-03 Cutler Hammer Inc Electromagnetic device

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5453821A (en) * 1988-11-23 1995-09-26 Datacard Corporation Apparatus for driving and controlling solenoid impact imprinter
US5010312A (en) * 1990-04-10 1991-04-23 Rostra Engineered Components Solenoid actuators
US5947442A (en) * 1997-09-10 1999-09-07 Cummins Engine Company, Inc. Solenoid actuated valve assembly
US6049264A (en) * 1997-12-09 2000-04-11 Siemens Automotive Corporation Electromagnetic actuator with composite core assembly
US20030189473A1 (en) * 2002-04-05 2003-10-09 Moeller Gmbh AC electromagnet
US7280021B2 (en) * 2004-07-26 2007-10-09 Denso Corporation Linear solenoid designed to ensure required amount of magnetic attraction and solenoid valve using same
US20060017535A1 (en) * 2004-07-26 2006-01-26 Denso Corporation Linear solenoid designed to ensure required amount of magnetic attraction and solenoid valve using same
US20070069172A1 (en) * 2005-04-26 2007-03-29 Parker-Hannifin Corporation Magnetic repulsion actuator and method
US20070290779A1 (en) * 2006-06-14 2007-12-20 Datacard Corporation Laminated solenoid plunger for solenoid assembly
US7414504B2 (en) * 2006-06-14 2008-08-19 Datacard Corporation Laminated solenoid plunger for solenoid assembly
US20110050376A1 (en) * 2009-08-27 2011-03-03 Vacuumschmelze Gmbh & Co., Kg Laminate Stack Comprising Individual Soft Magnetic Sheets, Electromagnetic Actuator, Process for Their Manufacture and Use of a Soft Magnetic Laminate Stack
US20120038439A9 (en) * 2009-08-27 2012-02-16 Vacuumschmelze Gmbh & Co., Kg Laminate Stack Comprising Individual Soft Magnetic Sheets, Electromagnetic Actuator, Process for Their Manufacture and Use of a Soft Magnetic Laminate Stack
US8669837B2 (en) * 2009-08-27 2014-03-11 Vacuumschmelze Gmbh & Co. Kg Laminate stack comprising individual soft magnetic sheets, electromagnetic actuator, process for their manufacture and use of a soft magnetic laminate stack
US20130181156A1 (en) * 2011-08-26 2013-07-18 Drazen Boban Hydraulic transmission valve
US8791780B2 (en) * 2011-08-26 2014-07-29 Hillte Germany GmbH Hydraulic transmission valve

Also Published As

Publication number Publication date
GB1255411A (en) 1971-12-01
FR1592884A (de) 1970-05-19

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