DD149735A1 - HEAT-RESISTANT ISOLATION OF WINDINGS - Google Patents

Abstract

The invention relates to the preferred application of a heat-resistant insulation of windings in ultra-high vacuum technology. According to the invention, the winding wires and the winding body are made of aluminum, the surface of which is galvanically oxidized for insulation according to known methods. In principle, it is also possible to use other metals whose surfaces can be covered by an electroplating process with an insulating layer which has similar favorable properties as Al & ind2! O & ind3! having. The purpose of the invention is a simple and inexpensive production of windings used predominantly for the generation of electromagnetic fields. Other customary wire insulations made of special polymers are unsuitable for the frequently required annealing and working temperatures of UHV apparatuses for softening, gas release or chemical instability. By erfindungsgemäaesze winding production these disadvantages are avoided, and it eliminates the need to create complex and technically often unsatisfactory substitute solutions. The most important possible applications are the electromagnetic generation of mechanical movements and the focusing and deflection of charged particle beams within vacuum chambers.

Description

M-

1 · Heat resistant insulation of windings

Field of application of the invention

The invention relates to the application of a known isolation method to wires used in coils or windings which are exposed to higher temperatures while remaining chemically and physically stable. The main field of application is ultrahigh vacuum technology (eg electromagnetic motion elements, electromagnetic lenses and deflectors for electron and ion beams _{# #}

Characteristic of the known technical solutions

As the heat-resistant insulating materials, various organic materials (e.g., polytetrafluoroethylene, polyimidequinoxaline, polyimidephenylquinoxaline, etc.) which are useful in air of about 250 ° C are known. In vacuum equipment, the upper limit temperature is lower because of the gas delivery or vapor pressure of the organic materials, which is below the baking or working temperatures required in many cases.

Depending on the field of application, technical substitute solutions are required instead of such windings in these cases

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(For example, glass fiber wrapping of wires, cantilevered winding of bare wires, replacement of electromechanical moving elements by bimetal or mechanical movement bushings, etc. Replacement of electromagnetic lens systems by electrostatic deflectors; local cooling of winding; disassembly of winding mounted outside vacuum chamber during annealing, etc.).

2. Object of the invention

It is the object of the invention to provide a method by which iron can be prepared, their isolation

a) remains chemically and physically stable at high temperatures (^ 400 C);

b) at these temperatures has a vapor pressure which is negligible relative to the working pressure in the vacuum chamber;

c) is characterized by low gas delivery;

d) is easy and inexpensive to produce.

By realizing these goals, it becomes possible to expand the possibilities of using UHV technology, to make it much more cost- and material-saving, and to save energy when producing the ultrahigh vacuum by shortening the heating times at a higher temperature.

Explanation of the essence of the invention

Conventional insulation insulations can only be used in vacuum chambers which have to be heated to reach the working pressure up to a material-dependent upper limit temperature, which must be higher in order to achieve shorter heating times or higher final vacuums than the previous insulation materials permit. The producers

The use of electromagnetic fields and other applications of electrical windings in a vacuum chamber therefore requires technical compromise solutions which are very complex and which exclude many possible applications «

According to the invention, these disadvantages are partially overcome by replacing the nickel wires usually coated with organic insulating layers with aluminum wires previously coated with an aluminum oxide insulating layer by anodic oxidation. In the production of the winding is to be ensured by appropriate design measures that the mechanically sensitive insulating layer is not damaged (avoidance of kinks, scrubbing u.a.). Zv / eckmäßig is the use of a V / ick body, which also consists of aluminum with anodized surface.

Ausführunpsbeinpiel

The basic design of a winding according to this invention does not differ from other windings; it must only be ensured by constructive measures that arise in the production or use of the winding no durcn kinking or abrasion caused short circuits between individual winding wires with each other or to the winding body. In order to produce a simple pull magnet, this requirement can be fulfilled, for example, by a rotationally symmetrical design, in which the cylindrical winding body with flat end faces contains one or more layers of tightly wound wire as a winding.

Claims (1)

invention claim Heat-resistant insulation of windings, preferably for electromagnetic applications within vacuum chambers and / or in media and / or at temperatures which chemically or physically attack other insulation, characterized in that the winding wire is made of anodized aluminum or another by an electroplating process an insulating layer coated metal, and / or the winding body also preferably consists of such a material.