DE1539918C3 - Shaded pole core - Google Patents

Description

1 2

The invention relates to a shaded pole core.

with a flat bolt surface divided into two poles, with the most technically simple means, the magnetic ones

which one of the poles is surrounded by a short-circuit ring - the flow of the one not enclosed by the short-circuit ring

is closed and at which the magnetic flux to weaken the pole part, one beyond that

in the other, not from the short-circuit ring, the remaining magnetic flux from the start

closed pole part - can be predicted by a gap between by placing the rest or.

this pole piece and the core is reduced. . Transition cross-section between the gap and the

In shaded pole cores, it is known to have a problem with short-circuit racks in a suitable position and depth, iisch, the magnetic flux of the short-circuit ring Thus, not only succeeded in the magnetic not to be able to weaken the enclosed pole part and the magnetic flux in general, but also Flux of the pole enclosed by the short-circuit ring. the remaining magnetic flux a priori advantage to align with each other in order to be able to determine as similar as possible. This creates a balance of power To achieve the two magnetic fluxes in one go on the entire pole face. '· ■ allows dimensions not achieved, so that practically

This is achieved with a shaded pole core, in which the same pole forces can be achieved at both poles

both pole parts are an integral part of the core.

so far achieved by the fact that the shaded pole core according to the invention does not consist of short

Ring-enclosed pole part on the pole face of the part of the part only consists of two components. The who

Core outside of the short-circuit ring partially or weakening the magnetic flux causing

is stepped backwards all around. 20 Gap is structurally easy to produce.

This measure is from the Austrian patent with a shaded pole core whose pole face is longitudinal

font 134 740 known and leads to an adjustment of a secant divided into the two pole parts,

of the two magnetic fluxes. The disadvantage, however, is that the gap can act as a groove with a flat groove bottom

here that the effective pole face for the armature are formed.

by gradually resetting a pole piece 25 In the case of a shaded pole core with concentrically

receives a smaller area, so that the armature has an opposite outer pole, short-circuit ring and

finds a smaller holding surface. - Inner pole, the gap can be formed by an annular groove

From the German Auslegeschrift 1 141 026 is a. ^:

Shaded pole core known, the flat pole face in two embodiments of a shaded pole core according to

concentric poles, of which the 3 ° of the invention are shown in the drawing;

inner pole, which shows through a stepped offset in this

End of the core is formed by a brief Fig. 1 a sectional view is enclosed by a gap closure ring. The outer pole is known as a pole core, in which the. The short-circuit ring is received in a loose outer pole face-side axial groove of the core that surrounds the short-circuit ring. A between the lower end 35 and one of the formed pole pieces encloses,
of short-circuit ring and outer pole ring on the one hand and F i g. 2 shows a cross section through the pole faces of the shoulder of the stepped core on the other hand, in front of the shaded pole core,

handener gap is filled with a material that F i g. 3 another embodiment of a column line Polkernes deviating from the permeability of the split poles in section, at the outer pole, short-circuit permeability of a certain minimum size and inner pole lie concentrically one inside the other, and sits. In the case of this shaded pole core, an Ab- F i g. 4 shows a cross section through the pole faces the same of the magnetic 'fluxes in the two pole' ses' shaded pole core, all figures in enlarged darts achieve, but the shaded pole core is shown in its position.

Production is expensive, since it consists of a total of four single- In the shaded pole core according to FIGS. 1 and 2 is composed of individual components, all of which have to be processed with the greatest care 45 in the pole face 10 a of the core 10 one in a fold, if the ordinal secantial plane extending incision 11 would ensure proper functioning of the shaded pole core would take a short-circuit ring 12 provided, should be catfish. The fastening of these components also encloses the pole part 13 below. The one outside of each other is connected with difficulties. In order to achieve:, the short-circuit ring 12 lying pole part 14 is aimed at a flat pole face, this generally has to be excited by a coil (not shown), while after the assembly of the shaded pole core, the pole part 13 is still excited by the short-circuit ring 12 , be ground. The one not enclosed by the short-circuit ring 12

The invention is based on the object, a pole part 14 of the core is below the lower loading

Shaded pole core of the type mentioned at the beginning of the decision boundary plane of the short-circuit ring 12 with a

dend to improve, namely with a view to a 55 groove 15 provided by the lateral surface 14 a of the

Much simpler structure and is guided radially inward on a loading pole part 14 and between

transverse, predeterminable adjustment of the magnet itself and the short-circuit ring 12 a residual or

table rivers in the two poles. Transition cross-section 16 leaves. The groove 15, which as

This is achieved according to the invention in that a meridial incision is made and the bottom of the gap is flat as one of the outer surface of the core 60, and can according to the desired - below the lower delimitation plane of the short magnetic flux of the locking ring built up by the pole part 14 - inwardly extending groove formed magnetic force field more or less deep and and is arranged in such a way that be formed between the grooves close to the short-circuit ring 12 ,
wall and the above-mentioned delimitation plane. A further embodiment of a shaded pole core ringerter, due to the position and depth of the groove in its 65, is shown in FIGS. 3 and 4. With such a shaded pole size, predeterminable transition cross-section between the core 110 , the pole part representing an outer pole is the core and is not enclosed by the short-circuit ring 114, the short-circuit ring 112 and a pole part consisting of the inner pole. forming pole part 113 concentrically inside one another

orderly. In this embodiment too, the short-circuit ring is below the lower delimitation level 112 a gap 115 is provided in the form of an annular groove, the depth and position of which the remaining or transition cross-section 116 and thus the magnetic flux of the field, which from the outer pole 114 is being built.

The invention is not restricted to the embodiments shown. Rather, one can a weakening of the magnetic flux of the pole part 14 or 114 not encompassed by the short-circuit ring design effecting gap 15 or 115 in a form modified from the illustration.

Claims (3)

Claims:., 1. Shaded pole core with a flat pole face divided into two poles, in which one pole of a short-circuit ring is enclosed, and in which the magnetic flux in the other - Pole part not enclosed by the short-circuit ring - through a gap between this pole part and the core is reduced, characterized in that the gap is one of the lateral surface (14 a) of the core (10, 110) - below the lower boundary plane of the Short-circuit ring (12, 112) - formed inwardly extending groove (15,115) and arranged in such a way is that between the groove wall and the mentioned boundary plane a reduced, The size of the transition cross-section (16, 116) between the core and the pole part (14, 114) not enclosed by the short-circuit ring. 2. shaded pole core according to claim 1, characterized in that with a shaded pole core (10) whose pole face (10 a) is divided along a secant into the two pole parts (13,14), the gap as a groove (15) with a flat groove bottom is trained. 3. Spaltpolkerri according to claim 1, characterized in that that in the case of a shaded pole core (110) with an outer pole lying concentrically one inside the other (114), short-circuit ring (112) and inner pole (113) the gap is formed by an annular groove (115). 1 sheet of drawings