EP0373109A1 - Relais polarisé pour plaquette de circuit imprimé - Google Patents

Relais polarisé pour plaquette de circuit imprimé Download PDF

Info

Publication number: EP0373109A1
Authority: EP; European Patent Office
Prior art keywords: armature; relay; coil; carrier body; permanent magnet
Prior art date: 1988-12-02
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

Application number

EP89810896A

Other languages

German (de)

English (en)

Other versions

EP0373109B1 (fr

Inventor

Kurt H. Altorfer

Hans A. Diem

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.)

Nokia Solutions and Networks Schweiz AG

Original Assignee

Alcatel STR AG

Standard Telephon and Radio AG

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.)

1988-12-02

Filing date

1989-11-22

Publication date

1990-06-13

1989-11-22 Application filed by Alcatel STR AG, Standard Telephon and Radio AG filed Critical Alcatel STR AG

1989-11-22 Priority to AT89810896T priority Critical patent/ATE96940T1/de

1990-06-13 Publication of EP0373109A1 publication Critical patent/EP0373109A1/fr

1993-11-03 Application granted granted Critical

1993-11-03 Publication of EP0373109B1 publication Critical patent/EP0373109B1/fr

2009-11-22 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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Classifications

- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H51/00—Electromagnetic relays
- H01H51/22—Polarised relays
- H01H51/2272—Polarised relays comprising rockable armature, rocking movement around central axis parallel to the main plane of the armature

Definitions

the present invention relates to a polarized circuit board relay according to the preamble of the first claim.
circuit board relays which have a so-called dual-in-line connection assignment and which have in common that they must not exceed a certain height from the circuit board so that circuit boards with relays mounted thereon can be arranged next to one another with a standardized distance.
Polarized PCB relays are e.g. known from EP-A 0 196 022 and EP-A 0 197 391, one of these documents describing a monostable version and the other a bistable version with two changeover contacts each.
a permanent magnet arranged above the coil connects with poles of the same name at both ends and the opposite pole in the middle in the bistable version.
the two legs of the core running through the coil are offset somewhat from the center, with the armature again arranged above the permanent magnet. Since, as already mentioned, the height of the relay should not exceed a certain value, this design necessarily results in a restriction of the available winding space.
All three relays have a U-shaped core in common, ie the core must be bent at right angles at two points. A machining process is therefore necessary which can have a negative influence on the magnetic quality of the soft iron core and requires very tight tolerances in order not to influence the magnetic circuit by undesirable additional air gaps due to bending angle errors due to tool wear. Compliance with the tole satchel becomes particularly critical when an annealing process has to be provided to eliminate bending influences.
Common to all three relays is the feature that the changeover springs are firmly connected to the armature, which makes separate preassembly and testing of the spring set and magnetic circuit impossible, which is very desirable in the case of automated production to be aimed at.
a carrier body 1 shows the individual parts of the relay in an exploded view, namely a carrier body 1, changeover contact springs 2, an armature 3, a coil assembly 4 and a cover 5.
the carrier body 1 is a trough-shaped plastic injection-molded part, in which all the connecting lugs are held by extrusion coating.
practically all of these metal parts lie in one plane during the spraying process and are still connected via webs to a carrier tape, which arises from the fact that tape material is subjected to a punching operation in which the parts not to be used are punched out, but the parts to be used are in Tape remain and are still connected to it via narrow webs, which makes their handling much easier.
the webs are punched and bent operation separated and the external connecting lugs are bent and come to lie in corresponding recesses in the support body 1.
connection lugs 11 for a first coil On each of the long sides of the carrier body 1 there are terminal lugs 11 for a first coil, 12 for a normally closed contact, 13 for a normally open contact, 14 for a changeover spring and, if necessary, 11 'for a second coil.
the names for the connection lugs 12 and 13 refer to the monostable version of the present relay. They are resp. For the bistable execution by contact 1. Replace contact 2.
tabs 15 On each of the narrow sides is a pair of tabs 15 respectively. 16 are present, which are bent up during the stamping and bending operation following the extrusion coating.
the tabs 15 are connected to the corresponding terminal lugs 11, whereas the tabs 16 are always present, but of course can only be connected to these with a second coil if terminal lugs 11 'are present.
the task of tabs 15 and 16 is explained in more detail in the explanation of the assembly of the relay.
connection lugs 12 are each electrically connected to a normally closed contact 18 in the bottom of the carrier body 1, while the connection lugs 13 are each connected to a work contact 19 of the same design.
the connection lugs 14 are each electrically connected to a connection plate 17.
the connection plate 17 and the contacts 18 and 19 are held by stamps, on the one hand to ensure their exact position in the carrier body, and on the other hand to protect them on both sides against being covered by spray compound, which is particularly the case in Fig. 3 is clearly visible.
This allows connecting surfaces 24 of the changeover springs 2 to be connected to the connecting plates 17 by resistance welding or contact points or rods 18 ', respectively, after the extrusion coating. 19 'on the contacts 18 respectively. 19 apply if the latter were not already welded before the spraying process.
other welding methods are also possible, for example laser welding, electron beam welding, which are only one-sided Require accessibility.
the two changeover springs 2 already mentioned have the same shape in mirror symmetry and are still connected via webs to a carrier tape, the manufacture of which has already been described in connection with the other metal parts in the carrier body 1.
Each changeover spring has a rectilinear part 21 with forked ends which carry contact points 22. Lying in the same plane there is a short web 23 which runs perpendicular to the longitudinal axis of the part 21 and is connected to the connection surface 24 already mentioned via a Z-shaped offset. Since the longitudinal axis of the springs lies in the rolling direction of the strip, there is no risk of breakage with this offset and the spring properties of the strip material can be fully utilized for the contact springs.
the armature 3 consists of a closed rectangular soft iron frame 31, the long sides of which are overmolded over a certain length with a plastic part 32 in the form of a shell which is almost completely open at the top, the side walls of the shell being in the middle of the long side of the frame 31 by a rod 33 semicircular cross section are interconnected, whereby the entire plastic part 32 is fixedly connected to the frame 31.
cam-shaped projections 35 are also on the underside of part 32. The tasks of parts 32-35 will be explained later in connection with the assembly and operation of the present relay.
the coil assembly 4 has an I-shaped yoke 41, on the crossbar of which a coil flange 42 is snapped on.
the middle part of the yoke 41 serves directly as a support for a coil 44 and the ends of the crossbeams of the I project from the coil flange 42 on both sides so far that a rod-shaped permanent magnet 43 can be inserted between them, with projections 47 of the coil flanges 42 as stops serve for the permanent magnets 43.
the permanent magnets 43 are fixed thereon by drops of adhesive to the associated projections 47.
Each of the permanent magnets 43 is magnetized with three poles, that is to say that its two ends, which are magnetically in contact with the transverse beams of the yoke 41, have poles of the same name, for example south poles, while the opposite pole, in the present example the north pole, has the bistable one Execution of the relay is in the middle of the rod-shaped magnet and in the monostable version is slightly offset from the center.
the mechanical center of the permanent magnets 43 there is a recess 48 of semicircular cross section with a somewhat larger radius than that of the rod 33 of the armature 3.
the armature 3 with its rod 33 is supported in this recess 48 and rolls in it when the armature moves.
the magnets 43 are slightly tapered on the side with the recess 48 from the center towards the ends, and therefore have a prismatic shape in order to allow the armature 3 to rest over the entire surface in both positions of the latter.
the coil 44 is wound directly onto the central part of the yoke 41, this must be provided with suitable insulation.
a method is advantageously used for this purpose, in which a polymer layer is applied in a vacuum to all surfaces of the yoke, that is to say also to the surfaces through which the flux of the permanent magnets 43 runs.
this layer also creates a defined air gap in the magnetic circuit, so that other measures such as adhesive sheets or the like can usually be omitted.
the coil flanges 42 have tabs 45 on the end faces of the finished coils and connecting lugs 46 for the coil wires on the long sides of the finished coils.
the tabs 45 and connecting tabs 46 which each belong to a corner, are electrically connected to one another, are made of tape material and are molded in the same manner in a flat state, held in a carrier tape, and subsequently separated and bent, as is the case with the connections of the carrier body 1 has been described.
the tabs 45 are bent downward and the connecting tabs 46 are bent upward. This position of the latter allows the coil wire to be automatically wrapped around them at the beginning and at the end of the coil winding and also to automatically dip-solder these coils. After soldering, these connection lugs are bent back into the position shown in the drawing, which is necessary for reasons of space and at the same time provides strain relief for the winding ends.
the meaning of the tab 45 will be explained later in connection with the assembly of the present relay.
the lid 5 is a plastic part in the form of a parallelepiped with an open bottom.
its side walls cover the raised side walls of the carrier body 1.
the gap between the The corresponding side walls of the cover 5 and the carrier body 1 are selected so that a quantity of casting resin applied to the base of the carrier body in a known manner penetrates into the gap under capillary action to such an extent that a tight seal is provided after curing, but not to the extent that casting resin would flow into the free interior of the relay.
the connecting lugs lying in recesses of the carrier body 1 are of course also sealed.
the side walls 51 of the cover have projections 52 against the open side in order to provide the necessary distance between the relay and the printed circuit board for the washing process which takes place after the soldering.
the bottom of the carrier body 1 is provided with an opening 54, which is used for outgassing the relay after assembly and casting and optionally for filling with a protective gas.
This opening 54 is also tightly closed by a drop of a casting resin that hardens.
FIG. 2 shows an interior view of the long side of the relay according to the invention, the corresponding side walls of the carrier body 1 and the cover 5 being cut away.
3 shows an inside view of the narrow side of this relay, with both the corresponding walls of the carrier body 1 and the cover 5 being cut away, as well as the parts of the corresponding coil flange 42 projecting beyond the magnetic yoke 41.
the parts already shown in FIG. 1 are parts provided with the same reference symbols, the relay being shown in the assembled state.
the armature 3 is applied to the preassembled coil assembly 4 - yoke 41, coil flanges 42, wound coil 44, assembled permanent magnets 43 - and remains attached to it due to the action of the permanent magnets 43.
the preassembled magnetic circuit can now be checked for correct function, only the counterforce of the changeover springs 2 being simulated. Furthermore, the changeover springs 2 equipped with the contacts 22 can be installed in the carrier body 1 and the connection surfaces 24 can be welded to the corresponding connection plates 17. At this stage of the assembly, the contacts can be checked with their connections for contact pressure and resistance as well as with regard to the necessary actuation force.
the entire magnetic circuit assembly with parts 3 and 4 in the with the changeover springs 2 and the fixed contacts 18, 19 together with their connecting lugs equipped support body 1 are installed.
the cam-shaped projections 35 of the armature 3 press on the parts 21 of the springs 2, which in turn are supported on a support 37 formed on the bottom of the carrier body 1.
the magnet assembly 3 + 4 is fixed in the carrier-contact assembly 1 + 2 by welding the upper ends of the tabs 15 respectively.
16 of the carrier assembly with the corresponding tabs 45 of the magnet assembly for example by means of laser beam welding.
the tabs 45 like the tabs 16 already mentioned, are always present in the carrier body 1 at both ends of the coil assembly, regardless of whether two or four electrical connections are required for the coil connections.
a projection 36 is formed on the bottom of the carrier body 1, the upper side of which approximately corresponds to the shape of the hump-shaped projection 34 of the anchor bearing.
the monostable and the bistable embodiment of the present relay have in principle the same mechanical structure. There are differences in the position of the north pole N on the permanent magnet 43 and at most in the number of coils.
the north pole is offset somewhat to the left in the drawing relative to the mechanical center of the permanent magnet 43, which coincides with the axis of rotation 33 of the armature 3, ah. the magnetic circuit is asymmetrical with respect to the axis of rotation of the armature 3.
the position of the north pole coincides with the mechanical center of the permanent magnet, i.e. the magnetic circuit is symmetrical with respect to the axis of rotation of the armature 3.
the above asymmetry of the magnetic circuit in the monostable embodiment can optionally be accompanied by further measures that have the same effect, e.g. adhesive plates or one-sided cross-sectional reductions can be provided.
the magnetic flux ⁇ S induced by the excited relay coil 44 counteracts the magnetic flux ⁇ M ' caused by the permanent magnet 43 and supports the magnetic flux ⁇ M ⁇ likewise caused by the permanent magnet 43, see above that the anchor 3 tilts into the working position.
the relay coil is switched off, the flux ⁇ S disappears. Since the flux ⁇ M generated by the partial magnet with the larger volume, despite a larger air gap, causes a greater pulling force than the holding force caused by the flux ⁇ M ⁇ , the armature tilts back into the starting position when the coil 44 is de-energized and is replaced by the Flow ⁇ M ' caused holding force held in this position.

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Physics & Mathematics (AREA)
Electromagnetism (AREA)
Electromagnets (AREA)

EP19890810896 1988-12-02 1989-11-22 Relais polarisé pour plaquette de circuit imprimé Expired - Lifetime EP0373109B1 (fr)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT89810896T ATE96940T1 (de)	1988-12-02	1989-11-22	Polarisiertes leiterplattenrelais.

Applications Claiming Priority (4)

Application Number	Priority Date	Filing Date	Title
CH4481/88		1988-12-02
CH448188		1988-12-02
CH173/89		1989-01-19
CH17389		1989-01-19

Publications (2)

Publication Number	Publication Date
EP0373109A1 true EP0373109A1 (fr)	1990-06-13
EP0373109B1 EP0373109B1 (fr)	1993-11-03

Family

ID=25683751

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19890810896 Expired - Lifetime EP0373109B1 (fr)	1988-12-02	1989-11-22	Relais polarisé pour plaquette de circuit imprimé

Country Status (2)

Country	Link
EP (1)	EP0373109B1 (fr)
DE (1)	DE58906107D1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE2423286A1 (de) *	1974-05-14	1975-11-27	Fleischmann Geb	Gepoltes gleichstromrelais
FR2412921A1 (fr) *	1977-12-24	1979-07-20	Omron Tateisi Electronics Co	Dispositif electromagnetique
US4570138A (en) *	1983-01-31	1986-02-11	Matsushita Electric Works, Ltd.	Balanced armature type relay
EP0197391A2 (fr) *	1985-03-25	1986-10-15	EURO-Matsushita Electric Works Aktiengesellschaft	Relais électromagnétique polarisé
EP0282099A2 (fr) *	1987-03-13	1988-09-14	Omron Tateisi Electronics Co.	Relais électromagnétique

1989
- 1989-11-22 DE DE89810896T patent/DE58906107D1/de not_active Expired - Fee Related
- 1989-11-22 EP EP19890810896 patent/EP0373109B1/fr not_active Expired - Lifetime

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE2423286A1 (de) *	1974-05-14	1975-11-27	Fleischmann Geb	Gepoltes gleichstromrelais
FR2412921A1 (fr) *	1977-12-24	1979-07-20	Omron Tateisi Electronics Co	Dispositif electromagnetique
US4570138A (en) *	1983-01-31	1986-02-11	Matsushita Electric Works, Ltd.	Balanced armature type relay
EP0197391A2 (fr) *	1985-03-25	1986-10-15	EURO-Matsushita Electric Works Aktiengesellschaft	Relais électromagnétique polarisé
EP0282099A2 (fr) *	1987-03-13	1988-09-14	Omron Tateisi Electronics Co.	Relais électromagnétique

Also Published As

Publication number	Publication date
DE58906107D1 (de)	1993-12-09
EP0373109B1 (fr)	1993-11-03

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