EP0225236B1 - Electromagnetic relay - Google Patents
Electromagnetic relay Download PDFInfo
- Publication number
- EP0225236B1 EP0225236B1 EP19860402438 EP86402438A EP0225236B1 EP 0225236 B1 EP0225236 B1 EP 0225236B1 EP 19860402438 EP19860402438 EP 19860402438 EP 86402438 A EP86402438 A EP 86402438A EP 0225236 B1 EP0225236 B1 EP 0225236B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- yoke
- branches
- vertical
- permanent magnet
- relay
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/32—Electromagnetic mechanisms having permanently magnetised part
- H01H71/321—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements
- H01H71/323—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements with rotatable armature
Definitions
- the present invention relates to an electromagnetic relay. It more especially concerns a so-called “differential" relay designed to ensure the opening of a circuit breaker which cuts off the power supply from the circuit when a fault current develops in the user circuit.
- Patent application FR-A-2 371 766 describes and illustrates an electromagnetic relay containing a magnetic circuit consisting of a yoke with two vertical branches between the bases whereof a permanent magnet is installed and of a moving flap closing the magnetic circuit, together with a control circuit coiled on one of the vertical branches of the yoke.
- a spring subjects the moving flap to a flexible return force slightly less than the holding attraction force due to the magnetic flux created by the permanent magnet.
- This document proposes doing away with the necessity of shunting the permanent magnet via a shunt branch, by using a permanent magnet in a very costly semi-remanent material; moreover it only proposes a basic pattern for the structure of the magnetic circuit without proposing the method of embodiment, easy to industriiialize.
- Document FR-A-2 448 784 describes and illustrates a type of electromagnetic relay currently employed in the field of safety contactors in which the permanent magnetic is installed below the lower branch of the magnetic yoke. This arrangement, apart from the fact that it requires a more powerful permanent magnet, increases the overall height of the relay.
- the purpose of the present invention is to propose an electromagnetic relay which remedies the drawbacks latent in the types of relay which have just been described.
- the invention proposes an electromagnetic relay, characterized in that the bases of the said vertical branches are connected together by a horizontal magnetic shunt branch parallel to the lines of force of the magnetic flux created by the permanent magnet.
- the said vertical branches and the said horizontal branch form a single part in magnetic material obtained by cutting out a plate and bending it parallel to the vertical direction of the said branches.
- the electromagnetic relay 10 shown in the drawings contains a housing 12, closed by a cover 14, which contains the magnetic circuit of the relay and its control circuit.
- the magnetic circuit basically consists of a yoke 16 and a flap 18 closing the magnetic circuit.
- Yoke 16 contains two branches 20, 22 parallel and vertical (as shown in the drawings).
- a permanent magnet 24 is installed between the respective bases 26, 28 of the vertical branches 20, 22 of the yoke.
- the permanent magnet has a rectangular parallelepipedic form and its two parallel polar faces 30, 32 are placed parallel to the vertical plane in which branches 20 and 22 of yoke 16 extend.
- the two vertical branches 20 and 22 are connected together by a horizontal magnetic shunt branch 34 which extends perpendicularly to the vertical plane of the two branches whose bases 26, 28 it connects, and parallel to the lines of force of the magnetic flux created by the permanent magnet 24.
- yoke 16 consists of a single part formed of the two vertical branches 20, 22 and of connec ting branch 34.
- Yoke 16 can be produced very simply by cutting out the developed structure of the yoke in a thick plate, in magnetic material, then through two successive bending operations along a direction parallel to the vertical direction of the two branches.
- the closing flap 18 is hinged to yoke 16 close to the free end of branch 22 via a fastener 36 crimped to the said branch.
- a return spring 38 whose one end is secured to the fastener, and whose other end is secured to flap 18 applies to the latter an elastic return force slightly less than the holding attraction force due to the permanent magnet 24.
- the circuit controlling the relay here consists of a coil 40 wound round branch 20 of the yoke.
- the differential relays of the type just described are high sensitive relays, and so as to maintain the sensitivity as constant as possible in the course of time, it is necessary to provide for certain positioning of the permanent magnet in relation to the yoke.
- the yoke is inserted vertically into grooves 44, 46 in the housing which co-operate with the lateral faces 48, 50 opposite vertical branch 22. In this way yoke 16 is locked in position transversally in relation to housing 12.
- the yoke is inserted into housing 12 with the permanent magnet 24 installed between bases 26, 28 and horizontal branch 34 between which it is not yet positioned accurately.
- the lower face 52 of magnet 24 bears on the frame of coil 20 so as to define the height of the latter in relation to the horizontal plane delimiting bases 26, 28 of the vertical branches 20, 22.
- Cover 14 whose position in relation to housing 12 is defined exactly when closing the housing, contains a rectangular parallelepipedic recess 54.
- Two inclined faces 72, 74 located on sides 56 and 58 of recess 54 co-operate with the flat faces 82 and 84 of bases 26 and 28 of yoke 16 so as to lock the latter in position in housing 12.
- the magnet always occupies the same transverse position in relation to the vertical branches 20, 22 of yoke 16 and a constant air gap is maintained between the polar face of 32 of magnet 24 and the inner face 64 of the vertical branch 22.
- the final setting of the relay's sensitivity is only made after it has been fully assembled and inserted into the circuit whose safety it ensures, by modifying the magnetization of the permanent magnet. This latter operation is made very easy through the position of yoke 16 and magnet 24 located in recess 54 of the cover, on either side of which two polar branches can be brought close to a magnetiza- tion/demagnetization device.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electromagnets (AREA)
Description
- The present invention relates to an electromagnetic relay. It more especially concerns a so-called "differential" relay designed to ensure the opening of a circuit breaker which cuts off the power supply from the circuit when a fault current develops in the user circuit.
- Patent application FR-A-2 371 766 describes and illustrates an electromagnetic relay containing a magnetic circuit consisting of a yoke with two vertical branches between the bases whereof a permanent magnet is installed and of a moving flap closing the magnetic circuit, together with a control circuit coiled on one of the vertical branches of the yoke. A spring subjects the moving flap to a flexible return force slightly less than the holding attraction force due to the magnetic flux created by the permanent magnet.
- This document proposes doing away with the necessity of shunting the permanent magnet via a shunt branch, by using a permanent magnet in a very costly semi-remanent material; moreover it only proposes a basic pattern for the structure of the magnetic circuit without proposing the method of embodiment, easy to industriiialize.
- Document FR-A-2 448 784 describes and illustrates a type of electromagnetic relay currently employed in the field of safety contactors in which the permanent magnetic is installed below the lower branch of the magnetic yoke. This arrangement, apart from the fact that it requires a more powerful permanent magnet, increases the overall height of the relay.
- The purpose of the present invention is to propose an electromagnetic relay which remedies the drawbacks latent in the types of relay which have just been described.
- For this purpose the invention proposes an electromagnetic relay, characterized in that the bases of the said vertical branches are connected together by a horizontal magnetic shunt branch parallel to the lines of force of the magnetic flux created by the permanent magnet.
- According to another embodiment of the invention, the said vertical branches and the said horizontal branch form a single part in magnetic material obtained by cutting out a plate and bending it parallel to the vertical direction of the said branches.
- The various advantages of this invention will now be detailed in the following description with reference to the accompanying drawings:
- - Figure 1 is a vertical cross-sectional view of an electromagnetic relay in accordance with the teachings of this invention,
- - Figure 2 is a top view of the relay in Figure 1, the cover of the housing of the latter being removed,
- - Figure 3 is a perspective view of the relay in Figure 1,
- - Figure 4 is a cross-sectional view, at larger scale, of the cover of the housing of the relay in Figure 1,
- - Figure 5 is a top view of the cover in Figure 4, and,
- - Figure 6 is a simplified perspective view, at larger scale, of the yoke of the relay in Figure 1.
- The
electromagnetic relay 10 shown in the drawings contains ahousing 12, closed by acover 14, which contains the magnetic circuit of the relay and its control circuit. - The magnetic circuit basically consists of a
yoke 16 and a flap 18 closing the magnetic circuit. - Yoke 16 contains two
branches - A
permanent magnet 24 is installed between therespective bases vertical branches polar faces branches yoke 16 extend. - According to the present invention the two
vertical branches magnetic shunt branch 34 which extends perpendicularly to the vertical plane of the two branches whosebases permanent magnet 24. - As can be easily observed on Figure 6, and according to the invention, an advantageous embodiment is that
yoke 16 consists of a single part formed of the twovertical branches connec ting branch 34. - Yoke 16 can be produced very simply by cutting out the developed structure of the yoke in a thick plate, in magnetic material, then through two successive bending operations along a direction parallel to the vertical direction of the two branches.
- The closing flap 18 is hinged to yoke 16 close to the free end of
branch 22 via afastener 36 crimped to the said branch. - In the so-called "held" position the flap lies on the horizontal faces of the free ends of
branches permanent magnet 24 which is guided in the magnetic circuit. - A
return spring 38 whose one end is secured to the fastener, and whose other end is secured to flap 18 applies to the latter an elastic return force slightly less than the holding attraction force due to thepermanent magnet 24. - The circuit controlling the relay here consists of a
coil 40 woundround branch 20 of the yoke. - When a control current flows through
coil 40, the latter creates a magnetic flux reverse to that due to the magnet which suffices to switch over flap 18 which then occupies its position controlling the circuit breaker, shown as a dot-and-dash line in Figure 1, in which thepush pin 42 operates mechanically on a component of the circuit breaker. - The differential relays of the type just described are high sensitive relays, and so as to maintain the sensitivity as constant as possible in the course of time, it is necessary to provide for certain positioning of the permanent magnet in relation to the yoke.
- For this purpose, the yoke is inserted vertically into
grooves lateral faces vertical branch 22. In thisway yoke 16 is locked in position transversally in relation tohousing 12. - The yoke is inserted into
housing 12 with thepermanent magnet 24 installed betweenbases horizontal branch 34 between which it is not yet positioned accurately. Thelower face 52 ofmagnet 24 bears on the frame ofcoil 20 so as to define the height of the latter in relation to the horizontalplane delimiting bases vertical branches -
Cover 14, whose position in relation tohousing 12 is defined exactly when closing the housing, contains a rectangularparallelepipedic recess 54. - When
housing 12 is closed bycover 14, the upper protruding section ofyoke 16 and ofpermanent magnet 24 is installed inrecess 54 which is of suitable shape and size. - Two
inclined faces sides recess 54 co-operate with theflat faces bases yoke 16 so as to lock the latter in position inhousing 12. - An
inclined face 76 located onside 58 ofrecess 54, through astepping 86 inbase 28, co-operates with thepolar face 32 ofmagnet 24 so as to force the latter back in abutment against theinner face 62 of thevertical branch 20. In this way the magnet always occupies the same transverse position in relation to thevertical branches yoke 16 and a constant air gap is maintained between the polar face of 32 ofmagnet 24 and theinner face 64 of thevertical branch 22. - In the same way the lateral and vertical position- ings of
magnet 24 are obtained by twoinclined faces side 68 ofrecess 54, which co-operate with thelateral face 70 of thepermanent magnet 24. - It is easily understandable that, .on completion of the assembly of the various components of the relay and after closing the
cover 14 onhousing 12 by bonding or soldering, the position ofmagnet 24 in relation to the magnetic circuit is obtained in an accurate, reliable and constant manner. - The final setting of the relay's sensitivity is only made after it has been fully assembled and inserted into the circuit whose safety it ensures, by modifying the magnetization of the permanent magnet. This latter operation is made very easy through the position of
yoke 16 andmagnet 24 located inrecess 54 of the cover, on either side of which two polar branches can be brought close to a magnetiza- tion/demagnetization device.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8516188 | 1985-10-31 | ||
FR8516188A FR2589623B1 (en) | 1985-10-31 | 1985-10-31 | ELECTROMAGNETIC RELAY |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0225236A1 EP0225236A1 (en) | 1987-06-10 |
EP0225236B1 true EP0225236B1 (en) | 1989-06-28 |
Family
ID=9324388
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19860402438 Expired EP0225236B1 (en) | 1985-10-31 | 1986-10-30 | Electromagnetic relay |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0225236B1 (en) |
DE (1) | DE3664176D1 (en) |
FR (1) | FR2589623B1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5180520A (en) * | 1988-03-04 | 1993-01-19 | University Research Corporation | Ferroelectric liquid crystal compositions containing halogenated cores and chiral halogenated cores and chiral haloalkoxy tail units |
US5130048A (en) * | 1988-03-04 | 1992-07-14 | Displaytech, Inc. | Ferroelectric liquid crystal compositions containing chiral haloalkoxy tails units |
US5167855A (en) * | 1988-03-04 | 1992-12-01 | University Research Corporation | Ferroelectric liquid crystal compositions chiral haloalkoxy tail units |
USRE34726E (en) * | 1988-03-04 | 1994-09-13 | Displaytech, Inc. | Ferroelectric liquid crystal compositions containing chiral haloalkoxy tail units |
FR2644285B1 (en) * | 1989-03-08 | 1994-07-01 | Itt Composants Instr | ELECTROMAGNETIC RELAY, IN PARTICULAR FOR THE CONTROL OF A CIRCUIT BREAKER OR A DIFFERENTIAL SWITCH |
DE4240031A1 (en) * | 1992-11-28 | 1994-06-01 | Felten & Guilleaume Energie | Magnetic release for residual current circuit breakers |
DE19820768A1 (en) * | 1998-05-08 | 1999-11-11 | Siemens Ag | Holder magnet trigger device for protection switch gear, esp. for fault current circuit breaker |
FR2823369B1 (en) * | 2001-04-06 | 2003-10-24 | Realisation De Disjoncteurs So | ELECTROMAGNETIC TRIGGER COMPRISING AN ELECTROMAGNETIC CIRCUIT BASED ON AN ELASTICALLY DEFORMABLE BASE AND ELECTROMAGNETIC TRIGGER INCLUDING A FLOATING COIL |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1277420B (en) * | 1963-12-03 | 1968-09-12 | Siemens Ag | Holding magnet for automatic switch, especially residual current circuit breaker |
FR2371766A1 (en) * | 1976-11-23 | 1978-06-16 | Metalimphy | Polarised relay system for circuit breakers - has alloyed permanent magnet with reversible relative permeability and coercive force between |
EP0006829A1 (en) * | 1978-06-29 | 1980-01-09 | CMC Carl Maier + Cie AG | Magnetic trip device for fault current protective circuit breaker |
DE2905275A1 (en) * | 1979-02-12 | 1980-08-21 | Felten & Guilleaume Carlswerk | MAGNETIC SYSTEM FOR A TRIGGER, ESPECIALLY IN A FAULT CURRENT CIRCUIT BREAKER |
-
1985
- 1985-10-31 FR FR8516188A patent/FR2589623B1/en not_active Expired
-
1986
- 1986-10-30 EP EP19860402438 patent/EP0225236B1/en not_active Expired
- 1986-10-30 DE DE8686402438T patent/DE3664176D1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3664176D1 (en) | 1989-08-03 |
FR2589623B1 (en) | 1989-12-22 |
EP0225236A1 (en) | 1987-06-10 |
FR2589623A1 (en) | 1987-05-07 |
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