DE1563179B2 - IRON-LOCKED COIL REEL - Google Patents

Description

The invention relates to an iron-enclosed jacketed choke coil, in particular for current limitation in the case of gas discharge tubes, with a longitudinal winding supporting and extending longitudinally the choke coil magnetize transversely ferromagnetic see Core and a ferromagnetic jacket surrounding it, with the core inside of the jacket has a uniform cross-section over the entire wound area and with one of the Window area adapted winding is covered and the core and the jacket are in one piece and between each other Form two air gaps, the sectional areas of which are larger than the core cross-section in the wound Area are.

It has become known (British patent specification 991186), in which a small increase in the air gap cross-section compared to the core cross-section is unintentional or accidentally results from the round core shape. This enlargement of the cross-section is so insignificant, that no reduction in humming noises can be expected.

In a further known jacket choke coil (German Auslegeschrift 1147 693) has Core in one embodiment (Fig. 1 and 2) in the interior of the jacket over the entire wound area uniform cross-section, but here the air-gap sectional area is opposite the core cross-section not enlarged, so that humming noises occur here. In another embodiment (Fig. 3 and 4) of this interpretation, the core has a uniform shape within the winding area Cross-section, but is enlarged in the shape of a pole shoe on both sides. This will probably result in a reduction received the humming noises, but there is the major disadvantage that the winding coil does not wound separately on a machine and then pushed onto the core.

The object of the invention is to create a jacketed choke coil in which while maintaining the prerequisites for a significant reduction in humming noises, the pushing open the separately manufactured winding coil is possible. According to the invention this is achieved in that the two air gaps outside the area of the winding along two each arranged at an angle to one another End faces of the core run in such a way that one opposite one another without widening the core cross-section This enlarged, two planes lying at an angle to each other having air gap cut surface results.

Another type of inductor with longitudinally magnetized inner and outer core parts (German Auslegeschriften 1 067 527 and 1 097 562) already have angled air gaps, but the inner core is in two parts and the two inner core parts are separated by one middle, flat air gap separated from each other, while the two further angled air gaps are formed between the ends of the inner core parts and the core shell parts. Here, the average planar air gap is primarily decisive for the occurrence of hum, and the angular configuration of the outer air gaps only serves by pressing together the kernmantel ⁶ S parts to move the two core inner parts relative to one another and thereby the size of the central air gap adjust.

In a preferred embodiment of such a choke coil, the jacket is square and the core disposed diagonally therein.

Exemplary embodiments of the subject matter of the invention are shown in the drawing.

F i g. 1 shows a first example of a jacketed choke coil with a square jacket part and a triangular one Window area;

Fig. 2 is a plan view of Fig. 1;

F i g. 3 shows a second example of a jacketed choke coil with an octagonal jacket part and a trapezoidal one Window area;

F i g. 4 shows a third example of a jacketed choke coil having a circular jacket portion and a Window area in the shape of a segment of a circle.

In the example according to FIG. 1 and 2, the outer ferromagnetic shell part 1 has a square cross-sectional shape, and an inner ferromagnetic core part 2 is inserted into the same diagonally. the Narrow sides of this core part consist of two each enclosing a right angle Partial areas which form an air gap 3 with the assigned corner of the casing part 1, the sectional area thereof is larger than the active core cross-section. One wound on a template with shortened layers Coil 4 is pushed onto the core part 2, and the coil shape corresponds to the triangular window area S between the inner core part 2 and the shell part 1.

In the example according to FIG. 3, the outer shell part 1 'is octagonal, and the shape of the core part 2 'lifted coil 4' corresponds to the trapezoidal window area 5 ', whereby the air gap 3' again consists of two partial surfaces enclosing a right angle.

In the example according to FIG. 4, the outer casing part 1 ″, as can be seen, is circular, and the shape of the coil 4 ″ pushed onto the core part 2 ″ corresponds to the shape of the window surface 5 ″, which here is a segment of a circle. The air gap 3 ″ here also consists of two partial surfaces enclosing a right angle.

For claim 2 protection is only claimed in connection with claim 1.

Claims (2)

Patent claims: 1. Iron-closed sheathed inductor, in particular ^; to limit the current in gas discharge tubes, with a ferromagnetic core that carries a longitudinal winding and is magnetized transversely to the length of the choke coil and a ferromagnetic jacket surrounding it, whereby the core inside the jacket has a uniform cross-section over the entire wound area and is covered with a winding adapted to the window area is and the core and the '■■ jackets are in one piece and form two air gaps between each other, the sectional areas of which are larger than the core cross-section in the wound area, characterized in that the two air gaps (3, 3', 3 ") outside the area of the Windings (4, 4 ', 4 ") run along two angularly arranged end faces of the core (2"2', 2 ") in such a way that, without widening the core cross-section, a results in larger, two planes lying at an angle to each other having air gap sectional area. 2. Jacketed choke coil according to claim 1, characterized in that the jacket (1) is square and the core (2) is disposed diagonally therein. 1 sheet of drawings