EP1364377A1 - Actionneur electromagnetique - Google Patents
Actionneur electromagnetiqueInfo
- Publication number
- EP1364377A1 EP1364377A1 EP02706905A EP02706905A EP1364377A1 EP 1364377 A1 EP1364377 A1 EP 1364377A1 EP 02706905 A EP02706905 A EP 02706905A EP 02706905 A EP02706905 A EP 02706905A EP 1364377 A1 EP1364377 A1 EP 1364377A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- housing
- coil
- electromagnetic actuator
- axial direction
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/02—Cores, Yokes, or armatures made from sheets
-
- 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
- H01F7/081—Magnetic constructions
Definitions
- the invention relates to an electromagnetic actuator.
- Electromagnetic actuators comprising coils carried by a housing and actuating members each comprising a rod mounted movable in an axial direction of each coil, each coil being associated with a core formed by a stack of sheets of ferromagnetic material s extending parallel to the axial direction of the coil, the core having an active face extending perpendicular to the axis of the coil and external faces turned towards adjacent walls of the housing.
- the rod of the actuating member is generally associated with a pallet extending opposite the active face of the core.
- a magnetic flux is established in the core by the coil so that the pallet is attracted towards the active face of the core.
- the core sheets are attracted to the pallet, and therefore tend to move in the axial direction of the coil.
- This arrangement requires additional parts and additional cuts in the sheets. Furthermore, this arrangement requires additional assembly operations.
- the lateral external faces of the core comprise at least one retaining portion projecting from the lateral external face of the core in a direction forming with the axial direction of the coil an angle less than 90 degrees.
- the retaining portion extends adjacent to an edge of the core, over at least a quarter of the lateral face measured in the axial direction of the coil.
- the retaining force is distributed over an appreciable portion of the lateral face.
- the housing is molded on the core and extends in contact with the retaining portions of the lateral external faces of the core.
- the housing itself forms the retaining member.
- the housing is made of a thermally conductive material. This takes advantage of the large contact surface of the housing with the core to efficiently evacuate to the outside the heat generated in the core during the operation of the actuator.
- FIG. 2 is a sectional view along the plane II -II of Figure 1;
- FIG. 3 is a partial perspective view of the actuator.
- the electromagnetic actuator described here is suitable for controlling the opening and closing of two valves not shown with parallel axes X.
- the electromagnetic actuator is substantially symmetrical along a plane P defining a separation between the elements of the actuator intended for the control of each valve.
- the electromagnetic actuator includes a housing
- the cores 4,5 are formed by a stack of sheets of ferromagnetic material extending parallel to the axis X and have active faces 6 which extend opposite one another perpendicular to the axes X.
- the lower part 3 of the housing has a support contour 27 projecting from the active face 6 of the core 5 and parallel thereto.
- the contour 27 cooperates with a bearing face 28 of the upper part 2 of the housing to maintain a spacing between the active faces 6 of the cores 4,5.
- Housing parts have bores
- the cores 4, 5 have external faces co-taking a rear external face 19 formed by the juxtaposition of the rear edges of the sheets opposite the active face 6 and the lateral external faces 20 formed by the juxtaposition of the lateral edges of the sheets .
- Coils 8 are force fitted around intermediate parts 7 of the cores 4,5.
- the coils 8 are arranged opposite two by two to form two pairs of adjacent coils having parallel X axes.
- Each coil is framed on the one hand by a lateral part 10 of the corresponding core and on the other hand by a central part 11.
- the central part 11 is common to two adjacent coils.
- each pair of coils is associated with an actuating member 30 which can move along the associated axis X.
- Each actuator 30 comprises a pallet 15 extending between the active faces 6 of the 4,5 nuclei parallel to these.
- the pallet 15 is associated with an actuating rod 16 mounted to slide in a guide 22 passing through an intermediate part 7 of the core 5.
- the central plates of the core 5 are cut to form a passage 24 passing through the base of the core and a housing 26 at the level of each intermediate part 7.
- a cylindrical guide 22 having an external diameter less than the smallest transverse dimension of the passage 24 extends coaxially with the axis X through the passage 24.
- the guide 22 comprises a first part extending in the lower part 3 of the housing and maintained by the latter as will be indicated below, and a second part extending in the passage 24. The second part of the guide 22 extends to the active face 6 to ensure proper guidance of the rod 16.
- the second part of the guide 22 is included in a rectangular insert 23.
- the insert 23 has dimensions suitable for the sheet metal plates delimiting the housing 26 are in intimate contact with the insert when 'of the stack of sheets, and extends to an inner face 25 of the core on which there opens the passage 24.
- the passage 24 has a section lower than the section of the insert 23, so that the insert 23 covers the day between the guide 22 and the passage 24.
- the lateral external faces 20 of the cores 4.5 comprise retaining portions 21 which extend projecting from the lateral external faces 20 adjacent to the edge formed by the lateral external faces 20 and the associated rear external face 19.
- the retaining portions 21 extend in a direction which forms with the direction axial position of the coil at an angle B, here about 5 degrees.
- the height of the retaining portions 21 is preferably greater than a quarter of the height of the lateral faces 20.
- each core is assembled by first stacking the sheets previously cut according to the shape corresponding to their position in the stack.
- the guide 22 is force fitted into the insert 23, then the insert is positioned in the stack before clamping it between jaws which bear on the external sheets by masking the openings between the central part 11 and the intermediate parts 7 as well as between the intermediate parts 7 and the side parts 10.
- a mold is placed around the stack of sheets and the jaws which hold them and a non-magnetic material, preferably a thermally conductive material such as aluminum is injected to form the corresponding part of the housing as illustrated in FIG. 2.
- the good thermal conductivity of the material of the housing 1 and the large contact surface of the latter with the cores 4,5 make it possible to efficiently dissipate the heat generated in the cores 4,5 during operation of the actuator.
- the molded material forming the side wall 31 of the housing conforms to the external contour of the retaining portions 21 and ensures a locking by wedge effect of the sheets against an axial movement.
- the retaining portions thus produced make it possible to distribute the retaining force along these retaining portions while avoiding any concentration of stress in the core or in the housing.
- the insert 23 serves to hold the position in position of the guide 22, and prevents the molten material from flowing beyond the passage 24.
- the lower part 3 of the housing then extends into the space delimited by the external surface of the guide 22 and the passage 24 to maintain 5 lies the guide 22.
- the insert 23 is made of ferromagnetic material with high resistivity such as ferrite. The insert then partially compensates for the loss of magnetic efficiency of the core 5 resulting from the housing 26 in the intermediate parts 7.
- 15 tier are molded on the cores, one can use housing parts snap-on the core, or housing parts having an insert retaining member of the core. In particular, a shim can be engaged between the retaining portion of the core and the associated housing part.
- these retaining portions may more generally be located at any level of the lateral face, without necessarily being adjacent to this corner.
- retaining portions have been illustrated with a straight edge, they can also be made with a curved edge.
- an electromagnetic actuator having two actuating members and four coils, the invention is applicable to any type of electromagnetic actuator comprising at least one coil provided with a sheet metal core and associated with at least one actuator.
- the invention applies more generally to actuating members moving in an axial direction of the coils, without however that a rod of the actuating member passes through the coil.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0102880 | 2001-03-02 | ||
FR0102880 | 2001-03-02 | ||
PCT/FR2002/000724 WO2002071420A1 (fr) | 2001-03-02 | 2002-02-28 | Actionneur electromagnetique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1364377A1 true EP1364377A1 (fr) | 2003-11-26 |
EP1364377B1 EP1364377B1 (fr) | 2009-07-01 |
Family
ID=8860674
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02706905A Expired - Lifetime EP1364377B1 (fr) | 2001-03-02 | 2002-02-28 | Actionneur electromagnetique |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1364377B1 (fr) |
AT (1) | ATE435496T1 (fr) |
DE (1) | DE60232780D1 (fr) |
WO (1) | WO2002071420A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012018267A1 (de) | 2011-09-17 | 2013-03-21 | Bischoff Technologie-Management Gmbh | Hub-Zugmagnet, Verwendung eines Hub- Zugmagneten und Brems- oder Klemmeinrichtung für linear bewegte und/oder axial rotierende Bauteile |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5155461A (en) * | 1991-02-08 | 1992-10-13 | Diesel Technology Corporation | Solenoid stator assembly for electronically actuated fuel injectors and method of manufacturing same |
US6157277A (en) * | 1997-12-09 | 2000-12-05 | Siemens Automotive Corporation | Electromagnetic actuator with improved lamination core-housing connection |
DE19920094A1 (de) * | 1999-05-03 | 2000-11-09 | Bayerische Motoren Werke Ag | Elektromagnet mit einem Blechpaket |
DE19922426C2 (de) * | 1999-05-14 | 2001-03-29 | Siemens Ag | Elektromechanischer Stellantrieb |
DE19922422C2 (de) * | 1999-05-14 | 2001-05-03 | Siemens Ag | Elektromagnetische Stellantriebe |
-
2002
- 2002-02-28 DE DE60232780T patent/DE60232780D1/de not_active Expired - Lifetime
- 2002-02-28 AT AT02706905T patent/ATE435496T1/de not_active IP Right Cessation
- 2002-02-28 WO PCT/FR2002/000724 patent/WO2002071420A1/fr not_active Application Discontinuation
- 2002-02-28 EP EP02706905A patent/EP1364377B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO02071420A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE435496T1 (de) | 2009-07-15 |
EP1364377B1 (fr) | 2009-07-01 |
WO2002071420A1 (fr) | 2002-09-12 |
DE60232780D1 (de) | 2009-08-13 |
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