CH667161A5 - RELAY WITH AN L-SHAPED JOCH. - Google Patents

Description

DESCRIPTION

The invention relates to a relay having an L-shaped yoke, a magnetic core running on one leg of the yoke parallel to the other leg, the free end of which forms a pole face, and a magnetic hinged armature which is rotatably supported on the yoke and covers the core.

It relates in particular to the drive magnet system for such a relay.

Drive systems of the type mentioned are used in relays, especially in contactors and the like; The task of designing or developing such drive systems is essentially to reduce the assembly costs of the drive systems and, if necessary, to reduce the dimensions of the drive system with the same output.

In order to achieve this, the task is to optimize the armature of a drive with an L-shaped yoke in its outer shape or outer contour as far as possible.

According to the invention, this object is achieved by the characterizing features of claim 1.

Further configurations of the invention can be found in the dependent patent claims.

On the basis of the design rule according to the invention, the outer contour of the anchor in a round anchor plate will also assume a round or at least elliptical shape. The armature is widened in the area in which it rests on the pole face of the leg of the L-shaped yoke.

The invention will be explained and described in more detail with reference to the drawing.

It shows:

Fig. 1 is a side view of a drive system according to the invention and

FIG. 2 shows a top view of the drive system according to FIG. 1.

The drive system has an L-shaped yoke 10, on one leg 11 of which a magnetic core 12 is attached or fastened and runs parallel to the other leg 13 of the magnetic yoke 10. At the free end of the magnetic core 12, a pole plate 14 is attached, the center of which is eccentric to the central axis of the magnetic core 12, namely offset by the distance d toward the leg 13 of the yoke 10. On the edge

15 of the free end of the leg 13 of the yoke 10, a folding anchor 16 is supported.

The hinged anchor 16 has an outer contour adapted to the pole plate 14. A field line 20 can be seen which emerges from the lower edge 21 of the pole plate 14 and is curved upwards towards the hinged anchor plate 16. It enters the surface 22 facing the pole plate 14 exactly at its outer edge. After the course of this field line 20 emerging from the lower edge 21 of the pole plate 14, the anchor plate 16 is dimensioned. The result of this is that the armature plate 16 has an area 18 adapted to the pole plate 14 and a support area 17, between which an area 17a with a reduced cross section lies due to the above design rule. This is because the anchor plate 16 or the area 18 does not continue in a straight line into the area 17, but extends inwards towards the central axis Al-Al in order to obtain an adaptation to the area to the left of the central axis or The center line of the pole plate 14 lies.

An estimate of the individual dimensions can be obtained as follows:

As is generally known, the field lines emerge from a ferromagnetic medium into the environment almost vertically. This results approximately in the course of the field line 20. For the sake of simplicity, these are approximated by an arc with a radius p.

Then:

L-p from which follows:

L x sina + t + s is additionally:

tga

D = X2 - X, (3)

Here is:

L = length of the anchor

R = radius of the armature in the circular area p = circle radius of the field line 20 t = thickness of the pole plate 14

s = vertical distance of the contact plane of the armature on the yoke leg 13, in which plane the axis of rotation of the armature is located, from the surface plane of the pole plate 14 D = diameter of the pole plate 14 Xi = distances of the pole plate 14 from the yoke leg 13 X2 = distances of the pole plate from Yoke leg 13

With the above approaches, an optimization of the pole plate or anchor plate surface can be found for a given anchor shape, in which the magnetic field can be optimally utilized.

The value is determined using equations (1) and (la) and the value X2 from (2). Equation (3) gives approximately the diameter of the pole plate 14.

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667 161

With this design rule according to the invention, the utilization and thus the efficiency is improved. In this way, the stray field that is generated when the hinged armature 16 is open at the beginning of the current flow through the coil (not shown) is kept as low as possible. The tightening force on the folding anchor can thus be increased without the need to enlarge the folding anchor 16. The contour can then be determined by means of an iteration process, whereby it should be noted that the area at s 17A must of course satisfy the strength conditions.

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1 sheet of drawings

Claims (4)

667 161 1. Relay with an L-shaped yoke (10), one on one leg (11) of the yoke parallel to the other leg (13) extending magnetic core (12), at the free end of which a pole face is provided, and with a magnetic hinged armature (16) which is rotatably supported on the yoke and covers the core, characterized in that the pole face is formed by a plate (14) which is fastened eccentrically to the free end of the core (12), and in that the armature (16) is in the region the plate has an outer contour which is dimensioned such that the field lines (20) which emerge from the edge of the plate at the edge (21) which is distant in relation to the anchor just enter the anchor surface facing the plate. 2. Relay according to claim 1, characterized in that the plate is attached by an amount (d) to the yoke leg (13) offset to the core (12). 2nd PATENT CLAIMS 3. Relay according to claim 1 or 2, characterized in that the plate (14) is circular. 4. Relay according to claim 3, characterized in that the armature (16) has a plate (14) covering, the plate adapted area on which a widened extension (17) is formed, by means of which the armature on the yoke leg (13) is stored.