RU2167461C2 - Multilayer field coil and its manufacturing technique - Google Patents

Abstract

FIELD: electrical engineering; electrical equipment including load-lifting DC electromagnets. SUBSTANCE: field coil has several sections each wound of copper strip wrapped with insulating material so that the latter overlaps joints, impregnated with insulating varnish, and dried out. Sections are coaxially placed and their ends are covered with insulating compound, with insulating gaskets overall. Procedure is as follows: coil is made of several sections each being wound of copper strip, then they are impregnated and dried out. Section- to-section insulation is placed between butt ends. Sections are arranged coaxially and interconnected in series. Prior to winding copper strip is wrapped with one layer of insulating material overlapping the joints. Butt-end surface of first section is covered with insulating compound and with insulating gaskets whose edges are bent out to inner and outer diameters of first section. Next section is soldered to first one in series and its butt end is covered with insulating compound; then edges of second gasket are bent out to inner and outer diameters of second section; next sections are treated in same manner; upon assembly coil is bandaged and dried out. EFFECT: enhanced insulation resistance; facilitated manufacture. 2 cl, 2 dwg

Description

 The invention relates to electrical engineering and can be used, in particular in the design and manufacturing technology of electrical elements, and in particular in the excitation coils of lifting DC electromagnets.

 The known device contains one above the other flat dielectric boards in the form of rings, on each of which a printed winding is placed, as well as conclusions, insulating ring gaskets and plates of the magnetic circuit [1].

 The disadvantages of the known device include the complex manufacturing technology and insufficient reliability of the connection of the printed windings to each other.

 The closest in technical essence to the claimed technical solution is the selected as a prototype excitation coil of a lifting DC magnet, consisting of several separate sections coaxially stacked on top of each other, connected in series, with intersection isolation from micanite gaskets and washers.

 Each section is wound from bare copper tape with inter-turn insulation from electrical insulating asbestos material, which is impregnated and dried after winding.

The disadvantages of this field coil include:
1. The use of asbestos paper as interturn insulation.

 2. Lack of insulation at the ends of the tape.

 3. Lack of insulation at the last turn.

 Thus, there is only a compound between the section (coil consisting of several sections) and the magnetic circuit as insulation, which significantly reduces the reliability of the electromagnet, since the electric strength of the compound is 30 kV / mm and that of the insulating material is 75 kV / mm. In addition, the electrodynamic forces that occur when the voltage in the excitation coil of the lifting electromagnets is turned on and off causes deformation and displacement of the intersection electrical insulating gaskets and washers, which destroy the electrical insulating asbestos material, as a result of which inter-turn faults occur. The destruction of the electrical insulating asbestos material of the inter-turn insulation at the ends of the section can occur during impacts of the lifting electromagnet during operation.

 Thus, the lack of electrical insulation at the ends of the copper strip and the outer turn of the section dramatically reduces the reliability, the duration of the inclusion, the electrical insulation resistance of hoisting electromagnets [2] s. 26-29.

 The aim of the proposed technical solution is to increase environmental cleanliness, electrical insulation parameters: for example, electrical insulation resistance, as well as reducing the complexity of manufacturing.

 The specified technical result is achieved in that the multilayer excitation coil contains several sections, each of which is wound with a copper tape wrapped with electrical insulation material, impregnated and dried. The sections are connected and stacked coaxially on top of each other with the application of an electrical insulating mass on their ends and laying of electrical insulating gaskets on it with a bend to the width of the tape on the outer and inner diameters of the section.

 Comparison of the proposed solution with other technical solutions shows that the multilayer excitation coil is widely known in science and technology, but in the proposed solution they exhibit new qualities: such as environmental friendliness, increased electrical insulation resistance, as well as reduced laboriousness of manufacturing.

 In FIG. 1 is a top view of a multilayer drive coil. In FIG. 2 - callouts I (enlarged section element).

 The multilayer excitation coil consists of several sections of poses. 1, bare copper tape pos. 2, inter-turn insulation, pos. 3, wrapped around a copper tape with overlapping joint, intersection electrical insulation mass, pos. 5 and electrical insulating gaskets pos. 6 and brace 4. Sections are laid coaxially and welded together.

 Technological operations are carried out in the following order: the copper tape is wrapped with electrical insulation material in one layer with the overlap of the joint and wound into a section. At the end of the winding, the section is impregnated with electrical insulating varnish and dried. During assembly, an electrical insulating mass and two electrical insulating gaskets are applied to its end, the edges of the first gasket are bent to its outer and inner diameters. The second one is soldered sequentially to the first section and laid on an insulating mass, then the edges of the second strip are folded onto the outer and inner diameters of the second section. Further, the remaining sections are collected in the same way to the required amount and, in assembled form, are bandaged and dried.

 Thus, the use of the proposed technical solution in a multilayer excitation coil will increase environmental cleanliness, electrical insulation parameters: for example, electrical insulation resistance, as well as reduce the complexity of manufacturing.

Sources of information
1. Copyright certificate of the USSR of 1986 N 1267490, H 01 F 5/04, F 27/28.

 2. V.S. Kalinkin, G.O. Feiler. "Lifting electromagnets". Moscow, 1962

Claims (2)

 1. A multilayer excitation coil, consisting of several sections, coaxially arranged, connected to each other, and insulated from each other by intersection isolation, each section being wound from copper tape, characterized in that the copper tape is wrapped in insulating material in one layer with overlapping joint , and intersectional insulation consists of an electrical insulating mass and elastic electrical insulating gaskets.  2. A method of manufacturing a multilayer excitation coil, which consists in the fact that the coil is made of several sections, each section is wound from a copper tape, impregnated and dried, intersection isolation is placed between the ends of the sections, the sections are aligned and connected in series, characterized in that before winding, the copper tape is wrapped in insulating material in one layer with the overlap of the joint, intersection insulation in the form of an electrical insulating mass is applied to the end surface of the first section, then impose two elastic insulating gaskets, the edges of the first elastic gasket are bent to the outer and inner diameters of the first section, the second section is soldered sequentially to the first section and laid on the end face of the insulating mass, then the edges of the second gasket are bent to the outer and inner diameters of the second section, then the rest are similarly collected sections, after assembly, the coil is bandaged and dried.

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