DE1923840A1 - Electromagnetic relay - Google Patents

Description

DR-INQ. DIPL.-INQ. M SC. ". DIP ··.-PHVS. DR. DIPU-PHYS. HÖGER - LEGAL RIGHT-GRIESSBACH - HAECKER PATENT LAWYERS IN STUTTGART

A 37 330 h

8.5.1969

Italian patent registration Ho.37054A / 68

Texas Instruments Incorporated, Dallas, Texas, 'U.S.A.

Electromagnetic relay

The invention relates to an electromagnetic relay with a frame on which at least one stationary contact is attached, which cooperates with at least one movable contact that sits on a sleeve-like carrier, the one behind the other made of magnetizable material Slidable core and carries a spring resting against a stop at the end of the sleeve and against the core and axially on a guide pin fastened in the frame the magnetic field of a coil which is arranged on the frame and surrounds the carrier at a distance can be displaced in order to close the contacts is. Such relays are used, for example, for the automatic switching on and off of electric motors used.

The mode of operation is as follows.

When a certain current flows through the coil, the core is drawn into the magnetic center of the 4-way coil and acts through a spring during this movement

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a movable contact bridge that is pressed against the fixed contacts and thus the desired electrical Establishes connection.

During the displacement of the core, its speed increases until it hits, and then after several times Rebound as a result of the hard impact of the moving contacts on the fixed contacts the vibrations-des 'Kernes stop and this remains in a position in which all forces are in equilibrium, namely the magnetic force, the spring force, if necessary taking into account the gravitational forces, and the contact pressure force.

The aforementioned movement with its rebound causes damage to the contacts, apart from a high Material wear on the contacts is caused by the formation of arcs, which also cause sensitive radio interference cause and disturb the smooth starting of the motor.

The invention is now based on the object of a relay create in which a rebound of the moving contacts is avoided. This task is mentioned in the introduction Relay according to the invention solved in that the core is designed so that the magnetic attraction force during an er-B phase that lasts approximately until the contacts are touched, while generating a slow speed is small and during the second, until the core comes to a standstill, with appropriate compression the spring's continuous phase is increased to the full force of attraction required to achieve the desired contact pressure is required. This shape of the core allows the mass

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the same are distributed so that the desired characteristic is created and the movement of the core until it hits the Contacts is slow enough to avoid rebound whereupon the magnetic force is increased accordingly.

Preferably, during the first phase of the core, it is magnetic influenced mass correspondingly small, while in the ^ wide phase the magnetically influenced mass of the core is significantly increased until the core is then in its final position and thus reaches that of the equilibrium of forces.

The effect of such a shaped core is that at the moment of contact closure the core as possible has low speed while due to the action of magnetic force on the with its entire mass in its Equilibrium position moving core a high pressure force on the contacts is guaranteed.

This creates a sharp and hard clash of the moving ones Avoid contacts with the fixed contacts so that rebound is avoided.

Further advantages and features of the invention emerge from the following description in conjunction with the drawing, which contains exemplary embodiments of the invention. In the Show drawing:

1 shows the relay according to the invention in the rest position, Fig. 2 the relay at the end of the first phase, Fig. 3 the relay in the end position of the second phase, 4 shows a modified embodiment of the core.

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Those parts that are generally included in known and customary relays are on the Pig. 1, 2 and 3 shown with slightly drawn lines.

Stationary contacts 2 and 3 are on a housing part 1 Connection pieces 4 and 5 attached. There is also a housing part 21, on which the reel 6 is wound, with the housing part 1 by means of a pin 7 provided with a head and a socket 8 placed on the pin end is held together. All of these parts are usually made of non-magnetic material.

A sleeve 9 is slidably seated on the pin 7 and carries a bridge 10 with the movable contacts 11 and 12 as well as a spring 13 and a core 14 and is manufactured as a structural unit before installation. In general, the spring 13 and the sleeve 9 are also made of non-magnetic material.

According to the invention, the movable core 14 according to FIGS. 1, 2 and 3 has an outer annular recess 15 »during the The core according to FIG. 4 has an inner annular recess 16. Although the shape of these two recesses is different, their effect is exactly the same.

During the initial movement (see FIGS. 1 and 2) the main attraction force is applied the coil only on the zone 17 of the core 14, until approximately the position according to, Fig. 2 is reached in of the movable contacts 11 and 12 against the fixed ones Contacts 2 and 3 are applied with very little pressure. First thereafter the force of attraction of the coil has a significant effect on the zone 18 of the core 14, whereby the counter-

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force of the spring 13 is overcome and the core is so in those in Pig. 3 shown equilibrium position moves. In this way, the impact force of the bridge 10 against the fixed contacts 2 and 3 reduced to a minimum, so strong that no recoil and thus no Contact interruption can occur '. In the equilibrium position according to Pig. 3 affects the attraction force of the coil on the core 14 so that the desired firm contact pressure is then achieved.

While in the conventional relay the curve of the magnetic attraction force on the core increases progressively, this shows Curve in the relay according to the invention shows a sudden change in the slope in the phase immediately after it has taken place Contact closure in such a way that the contact closure still takes place at a relatively low speed, while subsequently the compressive force on the two contacts increases to a maximum value at least as in a conventional relay.

The present invention has been made in the context of a particular Embodiment (H-shaped cross-section) described, but this construction can still be used in the sense of the invention can be changed without losing the desired effect.

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Claims (1)

A 37 330 h - 6 - h-24 8.5.1969 Claims Γ 1 .j Electromagnetic relay with a frame on which ^ - ^ at least one stationary contact is fastened, which interacts with at least one movable contact that sits on a sleeve-like carrier that can slide one behind the other and a core made of magnetizable material bears against a stop at the end of the sleeve and against the core and is axially displaceable on a guide pin fastened in the frame by the magnetic field of a coil which is arranged on the frame and surrounds the stamp at a distance to close the contacts, characterized in that the core ( 18) is designed in such a way that the magnetic force of attraction during an approximately until contact of the contacts (2, 3 » 12, 13) lasting first phase with generation of a low speed is relatively small and during the second, until the core comes to a standstill (18) with appropriate compression of the spring (13) continuous phase increased to the full force of attraction, as it is for Achieving the desired contact pressure is required. 2. Relay according to claim 1, characterized in that during the first phase, which essentially determines the tightening force and is closest to the interior of the coil (6) Part of the core (18) is relatively small and then the first outside of the coil (6) Part of the core (18) has a much larger mass. 3. Relay according to claim 1 or 2, characterized in that the core (18) has the shape of a bell. - 7 - 009811/1266 A 37 330 h - 7 - 8.5.1969 4. Relay according to one of the preceding claims, characterized in that the core (18) essentially has the shape of a hollow cylinder, which has a ring recess (15) in the area facing the coil (6). 5. Relay according to claim 4ι, characterized in that the Annular recess (15) is arranged on the outside so that the part (17) that is left to face the coil (6) is essentially preferably many times larger than the part facing away from the spool (.6). 6. Relay according to claim 4 or 5 »characterized in that the annular recess (15) has a rectangular cross section. 7. Relay according to claim 3 or 4, characterized in that the part of the core (18) facing the coil (6) is weaker in strength than that facing away from the coil (6) Part is. 8. Relay according to claim 4 or 7, characterized in that the annular recess is attached to the inside of the core (18) .is. .- " 9. Relay according to claim 8, characterized in that the ring. recess (16) has a rectangular cross-section and preferably corresponds to approximately half the length of the core (18). . 10. Relay according to one of the preceding claims, characterized in that that two stationary contacts (2, 3) are arranged at a distance, with which two movable contacts -8th - 009811/1266 h-24
8.5.1969 (13 »12) cooperate on one of the sleeve (9) worn Kontäkfbrticke (10) are attached. 11. Relay according to one of the preceding claims, characterized in that the spring is a helical spring (13) . '- ■ ■ * 00 9811/1266 originally inspected