EP0455921B1 - Magnet zum Zusammenbau mit einer spritzgegossenen Kunststoffmasse - Google Patents

Magnet zum Zusammenbau mit einer spritzgegossenen Kunststoffmasse Download PDF

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Publication number
EP0455921B1
EP0455921B1 EP90420504A EP90420504A EP0455921B1 EP 0455921 B1 EP0455921 B1 EP 0455921B1 EP 90420504 A EP90420504 A EP 90420504A EP 90420504 A EP90420504 A EP 90420504A EP 0455921 B1 EP0455921 B1 EP 0455921B1
Authority
EP
European Patent Office
Prior art keywords
magnet
grooves
plastic material
slots
injected plastic
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
EP90420504A
Other languages
English (en)
French (fr)
Other versions
EP0455921A1 (de
Inventor
Erico Miazzolo
Reynald Mollimard
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.)
Aimants Ugimac SA
Ugimag SA
Original Assignee
Aimants Ugimac SA
Ugimag SA
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 Aimants Ugimac SA, Ugimag SA filed Critical Aimants Ugimac SA
Priority to AT90420504T priority Critical patent/ATE86408T1/de
Publication of EP0455921A1 publication Critical patent/EP0455921A1/de
Application granted granted Critical
Publication of EP0455921B1 publication Critical patent/EP0455921B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01F7/02—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.
  • Document US-A-3 881 243 discloses a method of fixing a magnet (17) by a plastic material (84) using ultrasonic vibrations, the magnet having grooves ( 92) axial, located on the internal lateral part (94) thereof.
  • the magnet for assembly with a plastic material has a lateral surface, a base surface and an upper surface of any shape (polygonal, circular, elliptical or other), and has on its lateral surface at least 2 grooves (or group of grooves) characterized in that these are inclined at an angle a on the base, and located on two opposite zones of the lateral surface.
  • the angle a is 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 made by grinding or grinding, with a shaping 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.
  • FIGS. 1 to 3 The invention will be better understood with the following example illustrated by FIGS. 1 to 3:
  • 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.
  • a magnet 1 type FeNdB of the following nominal composition (% at): Nd15 Fe77 B8 2 mm thick 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 1b, the machining direction being a 45 °.
  • thermosetting plastic "Arnox 2000” product marketed by General Electric Co, Schenectady, NY. USA
  • ⁇ 800 kA / m magnetized under field
  • 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)
  • Looms (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Control Of Combustion (AREA)
  • Safety Valves (AREA)

Claims (5)

  1. Magnet (1) zur Verbindung mit einem eingespritzten Kunststoffmaterial, der eine Seitenfläche, eine Basisoberfläche und eine obere Oberfläche beliebiger Form hat und auf seiner Seitenfläche (Ib) wengistens zwei Nuten (2) oder zwei Gruppen von Nuten aufweist,
    dadurch gekennzeichnet,
    daß diese unter einem Winkel (a) auf der Basis (1a) geneigt und auf zwei gegenüberliegenden Zonen der Seitenfläche angeordnet sind.
  2. Magnet nach dem Anspruch 1,
    dadurch gekennzeichnet,
    daß der Winkel (a) im Bereich von 15 bis 85 ° ist.
  3. Magnet nach einem der Ansprüche 1 oder 2,
    dadurch gekennzeichnet,
    daß die Maximalbreite der Nuten (2) im Bereich von 2 bis 5 mm ist.
  4. Magnet nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet,
    daß die Maximaltriefe der Nuten (2) im Bereich von 0,5 bis 2 mm ist.
  5. Magnet nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet,
    daß die Zahl. der Nuten jeder Gruppe wenigstens 2 ist.
EP90420504A 1990-05-07 1990-11-21 Magnet zum Zusammenbau mit einer spritzgegossenen Kunststoffmasse Expired - Lifetime EP0455921B1 (de)

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
FR9005961 1990-05-07
FR9005961A FR2661774B1 (fr) 1990-05-07 1990-05-07 Aimant pour assemblage avec une matiere plastique injectee.

Publications (2)

Publication Number Publication Date
EP0455921A1 EP0455921A1 (de) 1991-11-13
EP0455921B1 true 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) FI912181L (de)
FR (1) FR2661774B1 (de)
IE (1) IE911525A1 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
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
DE2855986A1 (de) * 1978-12-23 1980-07-10 Flux Geraete Gmbh Elektromotor, insbesondere gleichstrommotor fuer kleinspannung
FR2447631A1 (fr) * 1979-01-25 1980-08-22 Ducellier & Cie Circuit inducteur de machine electrique tournante, notamment de vehicule automobile
JPS63219107A (ja) * 1987-03-07 1988-09-12 Takei Jushi Seisakusho:Kk マグネツトベ−スの枠体

Also Published As

Publication number Publication date
IE911525A1 (en) 1991-11-20
ES2038506T3 (es) 1993-07-16
FI912181A7 (fi) 1991-11-08
EP0455921A1 (de) 1991-11-13
FI912181L (fi) 1991-11-08
FI912181A0 (fi) 1991-05-06
ATE86408T1 (de) 1993-03-15
FR2661774B1 (fr) 1992-07-10
FR2661774A1 (fr) 1991-11-08
DE69001018D1 (de) 1993-04-08
DE69001018T2 (de) 1993-07-15

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