EP0455921A1 - Magnet to be assembled with an injected plastic material - Google Patents
Magnet to be assembled with an injected plastic material 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
- 239000000463 material Substances 0.000 title description 6
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000005291 magnetic effect Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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)
- Hard Magnetic Materials (AREA)
- Magnetic Treatment Devices (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
- Control Of Combustion (AREA)
- Safety Valves (AREA)
- Looms (AREA)
Abstract
Description
L'invention concerne un aimant pour assemblage avec une matière plastique injectée.The invention relates to a magnet for assembly with an injected plastic.
Selon l'art antérieur les aimants sont fixés à leurs supports par des moyens tels que l'assemblage mécanique (par vis ou boulons) ou par collage. Cependant dans certaines applications, ces moyens sont exclus, soit par le caractère ferro-magnétique des matériaux utilisés, soit par des questions d'encombrement stérique, les organes devant être très proches les uns des autres; enfin, le collage, bien que possible, est peu compatible avec la durée de l'injection de la matière plastique, et réduit considérablement la productivité de la gamme de fabrication; en effet le temps d'injection est de l'ordre de la seconde, alors que le temps de prise de la colle (polymérisation) est de l'ordre de 1 min.According to the prior art, the magnets are fixed to their supports by means such as mechanical assembly (by screws or bolts) or by gluing. However in certain applications, 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.
L'aimant, selon l'invention, comporte, sur ses surfaces latérales, avant injection de la matière plastique, au moins deux rainures (ou deux groupes de rainures) inclinées sur la base de l'aimant, laquelle peut avoir une forme quelconque (polygonale, circulaire, elliptique, ou autres) et situées chacune sur les faces latérales sur deux côtés ou zones opposé(e)s, de cette base. Ces rainures ont une direction faisant un angle a par rapport à la base, l'angle a étant compris entre 15 et 85°, les directions en regard étant non parallèles. La largeur maximale 1 des rainures est comprise entre 2 et 5 mm, et leur profondeur maximale p est comprise entre 0,5 et 2 mm.The magnet, according to the invention, 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.
Lorsque l'aimant est soumis en service à la fois à des forces magnétiques perpendiculaires et parallèles à son plan de base, il est préférable que l'angle a soit voisin de 45°.When the magnet is subjected in service to both magnetic forces perpendicular and parallel to its base plane, it is preferable that the angle a is close to 45 °.
Le nombre de rainures de chaque groupe en regard est fonction de la longueur du chant de l'aimant considéré ; il est typiquement supérieur ou égal à 2, et peut aller jusqu'à 5.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.
La forme de ces rainures peut être quelconque, mais de préférence elles ont la forme, en section droite, d'un rectangle, d'un carré, d'un trapèze ou d'un rectangle avec extrémité hemi-circulaire, etc...... Les rainures sont réalisées par meulage ou rectification, avec un outil de forme.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.
La matière plastique utilisée peut être durcie, selon des méthodes connues, par des fibres ou éléments particulaires tels que fibres de verre ou de carbone, particules de CSi, d'alumine, etc...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.
L'aimant utilisé peut être de matière quelconque, cependant ce type de jonction est particulièrement bien adapté aux aimants type FeNdB, de forme plate et de grande surface utile (orientés perpendiculairement au plan de la base).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).
De plus ce type de matériau, outre ses caractéristiques magnétiques adaptées (forte rémanence) est relativement facile à rectifier sans formation d'écailles sur les arêtes.In addition, 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.
L'invention sera mieux comprise avec l'exemple suivant illustré par les fig. 1 à 4 :
- La fig. 1 représente une vue en plan, l'aimant type FeNdB utilisé, (échelle 5), après usinage.
- La fig. 2 représente une vue perspective, avec écorché partiel, de l'aimant comportant des rainures latérales, inséré dans son support en matière plastique.
- La fig. 3 (variantes a, b, c, d) représente une vue en section droite des principales formes de rainures utilisables.
- Fig. 1 shows a plan view, the FeNdB type magnet used, (scale 5), after machining.
- Fig. 2 shows a perspective view, partially broken away, of the magnet having lateral grooves, inserted in its plastic support.
- Fig. 3 (variants a, b, c, d) represents a cross-section view of the main forms of grooves that can be used.
Un aimant 1 type FeNdB de composition nominale suivante (% at) : Nd₁₅ Fe₇₇ B₈ de 2 mm d'épaisseur a été pourvu, par rectification de 4 rainures 2, de section rectangulaire comme indiqué sur les fig. 1 et 2, de 1 mm de profondeur, et de 3 mm de largeur, sur deux côté opposés de sa surface latérale 1 b, la direction d'usinage étant a = 45°.A magnet 1 type FeNdB of following nominal composition (% at): Nd₁₅ Fe₇₇ B₈ of 2 mm thickness was provided, by rectification of 4
Les aimants ont ensuite été noyés dans un support 3 en matière plastique thermodurcissable "Arnox 2000" injectée à 130° C, laissant leurs grandes faces planes la, à nu, puis aimantés sous champ (≧ 800 kA/m) suivant une direction perpendiculaire à leurs grandes bases.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.
Les propriétés magnétiques obtenues sont les suivantes :
Br = 1,18T iHc = 800 kA/m (BH)max = 250 kJ/m³
Dans ces conditions, la force d'attraction entre deux aimants en regard, distants de 2 mm, est égale à 15 N. Ce mode d'assemblage résiste bien en service.The magnetic properties obtained are as follows:
Br = 1.18T i H c = 800 kA / m (BH) max = 250 kJ / m³
Under these conditions, the force of attraction between two facing magnets, 2 mm apart, is equal to 15 N. This method of assembly withstands well in service.
Les aimants selon l'invention trouvent en particulier des applications dans les transducteurs multiples, comme les commandes programmées des aiguilles de métiers à tisser ou d'imprimantes, aussi bien que dans les dispositifs où des aimants minces sont en forte interaction relative.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.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT90420504T ATE86408T1 (en) | 1990-05-07 | 1990-11-21 | MAGNET FOR ASSEMBLING WITH AN INJECTION MOLDED PLASTIC COMPOUND. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9005961 | 1990-05-07 | ||
| FR9005961A FR2661774B1 (en) | 1990-05-07 | 1990-05-07 | MAGNET FOR ASSEMBLY WITH AN INJECTED PLASTIC MATERIAL. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0455921A1 true EP0455921A1 (en) | 1991-11-13 |
| EP0455921B1 EP0455921B1 (en) | 1993-03-03 |
Family
ID=9396564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90420504A Expired - Lifetime EP0455921B1 (en) | 1990-05-07 | 1990-11-21 | Magnet to be assembled with an injected plastic material |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0455921B1 (en) |
| AT (1) | ATE86408T1 (en) |
| DE (1) | DE69001018T2 (en) |
| ES (1) | ES2038506T3 (en) |
| FI (1) | FI912181L (en) |
| FR (1) | FR2661774B1 (en) |
| IE (1) | IE911525A1 (en) |
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 (en) * | 1978-12-23 | 1980-07-18 | Flux Geraete Gmbh | LV DC motor with permanent magnets - held to stator casing by injecting heat-resistant plastics into keyways |
| EP0015165A1 (en) * | 1979-01-25 | 1980-09-03 | DUCELLIER & Cie | Inductor circuit for electrical rotating machine, especially for automobile starter motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63219107A (en) * | 1987-03-07 | 1988-09-12 | Takei Jushi Seisakusho:Kk | Frame of magnet base |
-
1990
- 1990-05-07 FR FR9005961A patent/FR2661774B1/en not_active Expired - Fee Related
- 1990-11-21 DE DE9090420504T patent/DE69001018T2/en not_active Expired - Fee Related
- 1990-11-21 AT AT90420504T patent/ATE86408T1/en not_active IP Right Cessation
- 1990-11-21 ES ES199090420504T patent/ES2038506T3/en not_active Expired - Lifetime
- 1990-11-21 EP EP90420504A patent/EP0455921B1/en not_active Expired - Lifetime
-
1991
- 1991-05-06 IE IE152591A patent/IE911525A1/en unknown
- 1991-05-06 FI FI912181A patent/FI912181L/en 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 (en) * | 1978-12-23 | 1980-07-18 | Flux Geraete Gmbh | LV DC motor with permanent magnets - held to stator casing by injecting heat-resistant plastics into keyways |
| EP0015165A1 (en) * | 1979-01-25 | 1980-09-03 | DUCELLIER & Cie | Inductor circuit for electrical rotating machine, especially for automobile starter motor |
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 |
|---|---|
| FR2661774B1 (en) | 1992-07-10 |
| ES2038506T3 (en) | 1993-07-16 |
| EP0455921B1 (en) | 1993-03-03 |
| DE69001018T2 (en) | 1993-07-15 |
| FI912181L (en) | 1991-11-08 |
| FI912181A0 (en) | 1991-05-06 |
| IE911525A1 (en) | 1991-11-20 |
| ATE86408T1 (en) | 1993-03-15 |
| DE69001018D1 (en) | 1993-04-08 |
| FR2661774A1 (en) | 1991-11-08 |
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