Inductor devices – With supporting and/or spacing means between coil and core – Preformed insulation between coil and core
Reexamination Certificate
1999-06-30
2001-02-20
Gellner, Michael L. (Department: 2832)
Inductor devices
With supporting and/or spacing means between coil and core
Preformed insulation between coil and core
C336S185000, C336S195000
Reexamination Certificate
active
06191677
ABSTRACT:
The invention relates to an inductance element in accordance with the preamble of patent claim
1
. Inductance elements of this type are known and are already commercially available.
TECHNICAL FIELD
The known inductance elements cited above involve, in particular, transformers and inductors which are suitable for high voltages.
Commercially available transformers have a coil former onto which a primary winding and a secondary winding are wound. The coil former has a chamber which is bounded by two parallel side walls and a cylindrical sleeve and in which the primary winding and the secondary winding are arranged. The cylinder axis of the cylindrical sleeve is identical to the winding axis of the primary and secondary windings. The primary and secondary windings are wound, in a manner separated from one another by one or more electrically insulating layers, about their common winding axis in different layers one above the other. These electrically insulating layers are arranged coaxially with respect to the cylindrical sleeve forming the chamber bottom and extend between the two parallel side walls. Transformers of this type do not have a satisfactory high-voltage endurance. In particular, the small air gap remaining between the side walls of the coil former and the insulating layers can lead to a short circuit between the primary and secondary windings.
Commercially available inductors which are suitable for high voltages have an essentially cylindrical coil former on which a wire winding is arranged. The winding axis of this wire winding runs parallel to the cylinder axis of the coil former. The coil former has a plurality of side walls which are arranged perpendicularly to the cylinder axis and form, along the cylinder axis, different chambers or winding spaces for the turns of the wire winding. In order to ensure a sufficient high-voltage endurance of the inductor, the turns of the wire winding are arranged in different chambers along the cylinder axis of the coil former. However, inductors of this type occupy a comparatively large amount of space.
SUMMARY OF THE INVENTION
The object of the invention is to provide an inductance element in accordance with the preamble of patent claim
1
having an improved high-voltage endurance and a compact spatial arrangement.
This object is achieved according to the invention by means of the characterizing features of patent claim
1
. Particularly advantageous embodiments of the invention are described in the subclaims.
The inductance element according to the invention has a coil former and at least one wire winding arranged on the coil former, the coil former having a cylindrical sleeve whose cylinder axis runs parallel to the winding axis of the at least one wire winding, and at least two side walls arranged perpendicularly to the winding axis, with the result that the cylindrical sleeve and the side walls form at least one winding space for the at least one wire winding. According to the invention, the at least two side walls are each equipped with at least one shoulder, which subdivide the at least one winding space into a non-constricted first region and into at least one constricted second region. In addition, the inductance element according to the invention has electrical insulation, which bears on the at least one shoulder or on the at least one step of the at least two side walls and thereby separates the non-constricted first region from the at least one constricted second region. By virtue of the aforementioned measures or features, the high-voltage endurance of the inductance element according to the invention is considerably improved and a compact spatial arrangement of the inductance element is made possible.
It is advantageous for the electrical connections of the inductance element according to the invention to be designed as metal pins anchored in the coil former. These metal pins are connected to the winding ends of the at least one wire winding via connecting wires. At least one of the two side walls of the coil former is advantageously provided with one or more first slots, which are arranged between the metal pins and extend from the edge of the coil former as far as the cylindrical sleeve. Furthermore, at least one of the two side walls is equipped with one or more second slots, which are likewise arranged between the metal pins and extend from the edge of the coil former as far as the at least one shoulder of the corresponding side wall. Moreover, it is advantageous for the first and second slots in each case to have a ramp or an inclined plane, which serve for guiding the connecting wires in the slots.
In a particularly advantageous manner, the invention can be applied to a transformer.
The transformer according to the invention has a coil former onto which at least one first winding and at least one second winding are wound, the first winding and the second winding having a common winding axis and being arranged in different layers, in a manner separated by electrical insulation, one above the other on the coil former. The coil former of the transformer according to the invention has a cylindrical sleeve and at least two side walls which are arranged perpendicularly to the winding axis and form at least one winding space for the transformer windings. The two side walls of the coil former in each case have at least one shoulder, which subdivide the at least one winding space into a non-constricted first region and into at least one constricted second region, and the electrical insulation bears on the at least one shoulder of the side walls and separates the non-constricted first region from the at least one constricted second region. It is advantageous for the at least one first winding to be arranged in the non-constricted first region and the at least one second winding to be arranged in the at least one constricted second region of the at least one winding space of the coil former, with the result that spatial separation of first winding and second winding is achieved by means of the electrical insulation. The invention's shoulders or steps on the side walls enable a compact spatial arrangement of the first and second windings. They improve the high-voltage endurance of the transformer by preventing, in particular, creepage currents and corona or spark discharges at the edges of the electrical insulation between first and second windings. Furthermore, the measures according to the invention allow the use of a comparatively thin plastic strip as the electrical insulation, said strip being arranged between the first and second windings and bearing on the shoulders or steps. The use of this comparatively thin electrical insulation between the first and second windings ensures a compact spatial arrangement and a minimal leakage inductance of the transformer. In order to compensate for small tolerances in the winding height of the first and second windings, the at least one shoulder of the side walls is advantageously provided in each case with a bevel, which ensures a continuous transition from the non-constricted first region to the at least one constricted second region. The first and second slots in the side walls also contribute to improving the high-voltage endurance. In an advantageous manner, the connecting wires for the at least one second winding are guided through the first slots, while the connecting wires of the at least one first winding are threaded through the second slots. The first and second slots improve the electrical insulation between the first and second windings and between the connecting wires of the first and second windings.
REFERENCES:
patent: 4596974 (1986-06-01), Tobben et al.
patent: 5220304 (1993-06-01), Ho
patent: 5369389 (1994-11-01), Schrammek et al.
patent: 5404123 (1995-04-01), Joseph
patent: 5696477 (1997-12-01), Yamamori et al.
patent: 5815061 (1998-09-01), Ho
Bahr Cristian
Busse Olaf
Cierpinski Jerzy
Eckhard Thomas
Grabner Martin
Bessone Carlo S.
Gellner Michael L.
Nguyen Tuyen
Patent-Treuhand-Gesellschaft fuer elktrische Gluehlampen mbH
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