EP0981138A2 - Dispositifs électromagnétiques - Google Patents

Dispositifs électromagnétiques Download PDF

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Publication number
EP0981138A2
EP0981138A2 EP99305843A EP99305843A EP0981138A2 EP 0981138 A2 EP0981138 A2 EP 0981138A2 EP 99305843 A EP99305843 A EP 99305843A EP 99305843 A EP99305843 A EP 99305843A EP 0981138 A2 EP0981138 A2 EP 0981138A2
Authority
EP
European Patent Office
Prior art keywords
core
output member
coil
spring
force
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.)
Withdrawn
Application number
EP99305843A
Other languages
German (de)
English (en)
Other versions
EP0981138A3 (fr
Inventor
Ludovic Chauvet
Philippe Drumel
Stephane Chauvet
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.)
Laird Holdings Ltd
Original Assignee
Draftex Industries Ltd
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
Application filed by Draftex Industries Ltd filed Critical Draftex Industries Ltd
Publication of EP0981138A2 publication Critical patent/EP0981138A2/fr
Publication of EP0981138A3 publication Critical patent/EP0981138A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1607—Armatures entering the winding
    • 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

Definitions

  • the invention relates to electromagnetic arrangements.
  • an electromagnetic arrangement comprising a core movable in a first direction against the action of spring means in response to electromagnetic energisation of a coil and movable in a second, opposite, direction in response to stored energy in the spring means as the latter resiles, an output member mounted for movement in directions corresponding to the first and second directions, first force transmitting means for transmitting a force from the core to the output member as the core moves in the first direction whereby to cause movement of the output member in the corresponding direction, and second force transmitting means for transmitting a force from the core to the output member as the core moves in the second direction whereby to move the output member in the corresponding direction characterised in that the force transmitting mean includes means for creating a predetermined amount of play as the core moves in one said direction whereby to permit accumulation of kinetic energy in the core before transmission of the force to the output member as the core moves into the opposite direction.
  • the electromagnetic arrangement shown in Figures 1 and 2 comprises a housing 5 containing an electromagnet which, in a manner to be described, moves an output rod 6 to and fro in the direction of the arrows A and B.
  • Rod 6 slides in a guide 7 and is connected to a mechanism (not shown) which is to be actuated by the electromagnetic arrangement.
  • the electromagnet comprises a core 8 slidable to and fro in the direction of the arrows A and B in a cylindrical space 10 which is defined within an armature 12 wound with an electrical coil 14.
  • the core 8 has two end faces 15 and 16, with a cylindrical recess 17 formed in end 16.
  • a compression spring 18 is located in the recess 17 and acts between the base 20 of the recess 17 and the closed end 22 of the cylindrical space 10.
  • the output rod 6 is rigid with a control rod 24.
  • the control rod 24 is of lesser diameter than the output rod 6 so as to define an annular end face 26 of the output rod 6 which extends around the control rod 24.
  • the control rod 24 is freely slidable within a bore through the core 8.
  • the control rod 24 has an enlarged head 27, and a second compression spring 28 acts between the base 20 of the cylindrical recess 17 and the underside of this head 27, so as to urge the control rod to the left (as viewed in Figures 1 and 2) relative to the core 8.
  • Figure 1 shows the configuration of the electromagnet assembly when the coil 14 is de-energised.
  • the core 8 is urged outwardly of the cylindrical space 10 by the compression spring 18 so that its end face 15 abuts against the housing 5 around the guide 7.
  • the core 8 thus abuts against the end face 26 of the output rod 6 and forces the latter outwardly of the housing 5 to its maximum extent.
  • the air gap 30 has its maximum size.
  • the core 8 When the coil 14 is electrically energised, the core 8 is electromagnetically attracted in the direction of the arrow A and moves inwardly of the cylindrical space 10, towards the end face 22, compressing the spring 18 and also compressing the spring 28. The force exerted by the compressed spring 28 thus drags the control rod 24 in the direction of the arrow A, thereby drawing the output rod 6 in the same direction. Movement of the core 8 in the direction of the arrow A stops when it abuts against the end face 22 of the cylindrical space 10, and the relative configuration shown in Figure 2 is achieved.
  • the movement of the output rod 6 in the direction of the arrow A is limited by external means (not shown) so that, with the core 8 fully attracted by the electromagnetic field, a predetermined amount of play 32 exists between the end face 15 of the core 8 and the end face 26 of the output rod 6.
  • the external means for limiting the travel of the output rod 6 can take any suitable form which is arranged so that the maximum travel of the output rod 6 in the direction of arrow A is less than the maximum travel of the core 6.
  • the strength of the spring 28 is selected so that the core 6 can continue its travel after the movement of the output rod 6 has stopped but with the necessary force still being applied to the output rod.
  • the electromagnetic arrangement preserves the configuration shown in Figure 2 for so long as the coil 14 is electrically energised.
  • the core 8 starts to move in the direction of the arrow B under the action of the energy stored in the compression spring 18.
  • the control rod 24 (and thus, also, the output rod 6) does not move, as the spring 28 resiles, or only moves slowly under the resiling action of spring 28.
  • the core 8 freely moves in the direction of the arrow B, gaining kinetic energy as it travels through the play 32.
  • curve I shows the electromagnetic force developed during energisation of the coil 14.
  • the electromagnetic force is at a minimum.
  • Curve II shows the operation during the return stroke of the core 8 under the action of the spring 18.
  • the force exerted by the spring 18 will he relatively high when the air gap 30 is zero.
  • this initial force causes the core 8 to accelerate as the core travels through the extent of the play 32 ( Figure 2).
  • the core 8 abuts against the end face 26 of the output rod 6, there will be a momentary and substantial increase in force applied to the output rod 6 as shown at 36 in Figure 3. Again, this will help to overcome the effects of any inertia acting against movement of the output rods 6.
  • This peak force then falls, and thereafter the force applied to the output rod 6 reduces gradually as the spring 18 resiles.
  • the magnitude of the shock force produced when the core 8 comes into abutment with the end face of the output rod 6 depends on the amount of the play 32, the pre-stress in the spring 18, the strength of the spring 18, and the mass of the core 8. Each of these parameters can be adjusted to obtain a desired shape for the curves shown in Figure 3.
  • an electromagnetic arrangement can be produced which produces a substantial and momentary increase in applied force during the return stroke of the core movement. If combined with means for temporarily augmenting the current through the coil at the beginning of the inward stroke (as explained in conjunction with Figure 3), the electromagnetic arrangement produces a substantial and momentary increase of force at the beginning of each of its two strokes. In this way, any inertial effect in the mechanism being controlled by the electromagnetic arrangement is overcome.
  • the arrangement remains monostable and therefore has a safety position if the coil becomes defective.
  • the maximum force exerted by the arrangement can be changed by adjusting the strengths of the two springs 18 and 28.
  • the springs enable the return force (direction B) to be adjusted to be different from the output force (direction A).
  • the coil 14 can be sealed within the housing 5, enabling a waterproof structure.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
EP99305843A 1998-08-15 1999-07-23 Dispositifs électromagnétiques Withdrawn EP0981138A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9817715A GB2340664A (en) 1998-08-15 1998-08-15 An electromagnetic device using a spring and dynamic core arrangement
GB9817715 1998-08-15

Publications (2)

Publication Number Publication Date
EP0981138A2 true EP0981138A2 (fr) 2000-02-23
EP0981138A3 EP0981138A3 (fr) 2000-03-15

Family

ID=10837244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99305843A Withdrawn EP0981138A3 (fr) 1998-08-15 1999-07-23 Dispositifs électromagnétiques

Country Status (2)

Country Link
EP (1) EP0981138A3 (fr)
GB (1) GB2340664A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102945725A (zh) * 2012-11-18 2013-02-27 苏州蓝王机床工具科技有限公司 一种电磁铁

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2007838A1 (fr) * 1968-05-04 1970-01-16 Danfoss As
FR2203147A1 (fr) * 1972-11-11 1974-05-10 Bosch Gmbh Robert
JPS58193988A (ja) * 1982-05-06 1983-11-11 Taiheiyo Kogyo Kk 電磁弁

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB638005A (en) * 1947-01-29 1950-05-31 Magnavox Co Solenoids
FR1158123A (fr) * 1956-10-05 1958-06-06 Bull Sa Machines Perfectionnements aux dispositifs d'actionnement par électro-aimants
GB2116776B (en) * 1981-08-21 1985-01-30 Caterpillar Tractor Co Solenoid having spring biased lost motion link

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2007838A1 (fr) * 1968-05-04 1970-01-16 Danfoss As
FR2203147A1 (fr) * 1972-11-11 1974-05-10 Bosch Gmbh Robert
JPS58193988A (ja) * 1982-05-06 1983-11-11 Taiheiyo Kogyo Kk 電磁弁

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 037 (M-277), 17 February 1984 (1984-02-17) & JP 58 193988 A (TAIHEIYOU KOGYO KK), 11 November 1983 (1983-11-11) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102945725A (zh) * 2012-11-18 2013-02-27 苏州蓝王机床工具科技有限公司 一种电磁铁

Also Published As

Publication number Publication date
GB9817715D0 (en) 1998-10-14
GB2340664A (en) 2000-02-23
EP0981138A3 (fr) 2000-03-15

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