EP0455921A1 - Magnet zum Zusammenbau mit einer spritzgegossenen Kunststoffmasse - Google Patents
Magnet zum Zusammenbau mit einer spritzgegossenen Kunststoffmasse Download PDFInfo
- Publication number
- EP0455921A1 EP0455921A1 EP90420504A EP90420504A EP0455921A1 EP 0455921 A1 EP0455921 A1 EP 0455921A1 EP 90420504 A EP90420504 A EP 90420504A EP 90420504 A EP90420504 A EP 90420504A EP 0455921 A1 EP0455921 A1 EP 0455921A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnet
- grooves
- injected plastic
- plastic material
- assembled
- 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
Images
Classifications
-
- 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
- H01F7/0221—Mounting means for PM, supporting, coating, encapsulating PM
Definitions
- the invention relates to a magnet for assembly with an injected plastic.
- the magnets are fixed to their supports by means such as mechanical assembly (by screws or bolts) or by gluing.
- these means are excluded, either by the ferro-magnetic nature of the materials used, or by questions of steric bulk, the members having to be very close to each other; finally, bonding, although possible, is not very compatible with the duration of the injection of the plastic material, and considerably reduces the productivity of the manufacturing range; indeed the injection time is of the order of a second, while the setting time of the glue (polymerization) is of the order of 1 min.
- the magnet comprises, on its lateral surfaces, before injection of the plastic material, at least two grooves (or two groups of grooves) inclined on the base of the magnet, which can have any shape ( polygonal, circular, elliptical, or other) and each located on the lateral faces on two opposite sides or zones, of this base.
- These grooves have a direction making an angle a relative to the base, the angle a being between 15 and 85 °, the opposite directions being non-parallel.
- the maximum width 1 of the grooves is between 2 and 5 mm, and their maximum depth p is between 0.5 and 2 mm.
- the angle a is close to 45 °.
- the number of grooves in each facing group is a function of the length of the edge of the magnet considered; it is typically greater than or equal to 2, and can go up to 5.
- the shape of these grooves can be any, but preferably they have the shape, in cross section, of a rectangle, a square, a trapezoid or a rectangle with a semi-circular end, etc. ...
- the grooves are produced by grinding or rectification, with a form tool.
- the plastic used can be hardened, according to known methods, by fibers or particulate elements such as glass or carbon fibers, CSi, alumina particles, etc.
- the magnet used can be of any material, however this type of junction is particularly well suited to FeNdB type magnets, of flat shape and large useful surface (oriented perpendicular to the plane of the base).
- this type of material in addition to its suitable magnetic characteristics (high persistence) is relatively easy to rectify without the formation of scales on the edges.
- a magnet 1 type FeNdB of following nominal composition (% at): Nd15 Fe77 B8 of 2 mm thickness was provided, by rectification of 4 grooves 2, of rectangular section as indicated in fig. 1 and 2, 1 mm deep and 3 mm wide, on two opposite sides of its surface lateral 1 b, the machining direction being a 45 °.
- the magnets were then embedded in a support 3 of thermosetting plastic "Arnox 2000” injected at 130 ° C, leaving their large flat faces la, exposed, then magnetized under field ( ⁇ 800 kA / m) in a direction perpendicular to their big bases.
- the magnets according to the invention find in particular applications in multiple transducers, such as programmed orders of loom needles or printers, as well as in devices where thin magnets are in strong relative interaction.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Magnetic Treatment Devices (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Control Of Combustion (AREA)
- Safety Valves (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
- Looms (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90420504T ATE86408T1 (de) | 1990-05-07 | 1990-11-21 | Magnet zum zusammenbau mit einer spritzgegossenen kunststoffmasse. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9005961A FR2661774B1 (fr) | 1990-05-07 | 1990-05-07 | Aimant pour assemblage avec une matiere plastique injectee. |
FR9005961 | 1990-05-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0455921A1 true EP0455921A1 (de) | 1991-11-13 |
EP0455921B1 EP0455921B1 (de) | 1993-03-03 |
Family
ID=9396564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90420504A Expired - Lifetime EP0455921B1 (de) | 1990-05-07 | 1990-11-21 | Magnet zum Zusammenbau mit einer spritzgegossenen Kunststoffmasse |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0455921B1 (de) |
AT (1) | ATE86408T1 (de) |
DE (1) | DE69001018T2 (de) |
ES (1) | ES2038506T3 (de) |
FI (1) | FI912181A (de) |
FR (1) | FR2661774B1 (de) |
IE (1) | IE911525A1 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3810056A (en) * | 1972-08-28 | 1974-05-07 | Outboard Marine Corp | Non-magnetized ceramic magnetic assembly |
US3881243A (en) * | 1973-03-16 | 1975-05-06 | Mallory & Co Inc P R | Method of making permanent magnet rotor for a synchronous motor |
FR2445053A1 (fr) * | 1978-12-23 | 1980-07-18 | Flux Geraete Gmbh | Moteur electrique a stator a aimants permanents |
EP0015165A1 (de) * | 1979-01-25 | 1980-09-03 | DUCELLIER & Cie | Erregerkreis für drehende elektrische Maschine, insbesondere für Kraftfahrzeug-Anlasser |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63219107A (ja) * | 1987-03-07 | 1988-09-12 | Takei Jushi Seisakusho:Kk | マグネツトベ−スの枠体 |
-
1990
- 1990-05-07 FR FR9005961A patent/FR2661774B1/fr not_active Expired - Fee Related
- 1990-11-21 AT AT90420504T patent/ATE86408T1/de not_active IP Right Cessation
- 1990-11-21 EP EP90420504A patent/EP0455921B1/de not_active Expired - Lifetime
- 1990-11-21 ES ES199090420504T patent/ES2038506T3/es not_active Expired - Lifetime
- 1990-11-21 DE DE9090420504T patent/DE69001018T2/de not_active Expired - Fee Related
-
1991
- 1991-05-06 IE IE152591A patent/IE911525A1/en unknown
- 1991-05-06 FI FI912181A patent/FI912181A/fi not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3810056A (en) * | 1972-08-28 | 1974-05-07 | Outboard Marine Corp | Non-magnetized ceramic magnetic assembly |
US3881243A (en) * | 1973-03-16 | 1975-05-06 | Mallory & Co Inc P R | Method of making permanent magnet rotor for a synchronous motor |
FR2445053A1 (fr) * | 1978-12-23 | 1980-07-18 | Flux Geraete Gmbh | Moteur electrique a stator a aimants permanents |
EP0015165A1 (de) * | 1979-01-25 | 1980-09-03 | DUCELLIER & Cie | Erregerkreis für drehende elektrische Maschine, insbesondere für Kraftfahrzeug-Anlasser |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 13, no. 8 (E-702)(3356) 10 janvier 1989, & JP-A-63 219107 (TAKEI JUSHI SEISAKUSHO K.K.) * |
Also Published As
Publication number | Publication date |
---|---|
FR2661774A1 (fr) | 1991-11-08 |
FR2661774B1 (fr) | 1992-07-10 |
FI912181A0 (fi) | 1991-05-06 |
IE911525A1 (en) | 1991-11-20 |
ES2038506T3 (es) | 1993-07-16 |
DE69001018T2 (de) | 1993-07-15 |
EP0455921B1 (de) | 1993-03-03 |
FI912181A (fi) | 1991-11-08 |
DE69001018D1 (de) | 1993-04-08 |
ATE86408T1 (de) | 1993-03-15 |
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