RU2537640C2 - Eddy-current device - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention relates to eddy-current devices, mainly to transformers and linear AC current limiters. The device includes the armoured core including rod, transverse and side yokes. Rod and side yoke are made in form of hollow cylindrical magnetic cores wound using magnetic tape. The transverse yokes include several trapezoidal parts distributed over the end face of the device magnetic system, they are wound using magnetic tape. In the rod core along its axis the nonmagnetic break is made, it is located against joint of any two parts of cores of the transverse yokes. The rod core is wound using isotropic magnetic tape. The isotropic magnetic material can be used to wound the cores of the transverse and side yokes also.

EFFECT: decreasing of the machine idle current and losses in the magnetic material.

4 cl, 3 dwg

Description

The invention relates to electric induction devices, mainly to transformers and linear AC reactors used to convert energy in electrical networks, to regulate energy in electrical networks to regulate and stabilize voltage and current in electrical, lighting and radio installations, as well as ballast and current limiting resistances.

Known electric induction apparatus, for example, a single-phase transformer, the active part of which contains windings and an armored core, consisting of a rod on which the windings are located, transverse and lateral yards (1).

The specified electric induction apparatus has a complex structure and manufacturing technology, as well as a large overall dimension in height and high consumption of magnetic material.

The complexity of the design of a powerful apparatus is combined with the complexity of the structures of the rods, transverse and lateral jugs. The core on which the windings are placed, in order to reduce the cost of materials, reduce the overall dimensions, as well as increase the mechanical strength of the windings and thereby increase their electrodynamic resistance, has the cross section in the form of a polygon inscribed in a circle. For this reason, the rod turns out to be composed of several packets drawn from plates of magnetic material of various sizes. Along with this, a device for tightening the bags is also required. The transverse and lateral yokes closing the rod, respectively, have the same design.

The complexity of the manufacturing technology of a powerful electric induction apparatus is due to the presence of the technological operation of cutting plates of magnetic material, of various sizes, as well as the time-consuming technological operation of recruiting from them or batching the core packs of the rod, transverse and lateral yokes. At the same time, it is also necessary to manufacture devices (accessories) for screeding packages and the screed process itself.

The complexity of the design of the low-power electric induction apparatus is due to the complexity of the shape of the plates of the magnetic material from which its core is drawn, for example, W-shaped. In the manufacture of a low-power apparatus, the technological operation of stamping plates is added to the batching operation, for which carbide dies are required, requiring frequent sharpening or replacement.

The large overall dimension in height of the electric induction apparatus is determined by the height of the transverse yoke.

The high consumption of magnetic material is due to the large mass of the magnetic circuit of the apparatus, and in devices of low power - even greater waste of magnetic material formed during stamping of the plates from which the core is burdened.

The listed disadvantages are also characteristic of the multiphase design of the electric induction apparatus.

A known induction apparatus, for example a single-phase transformer, the active part of which contains a winding or several windings and an armored core consisting of a rod, transverse and lateral yokes, the rod and side yoke made in the form of hollow cylindrical magnetic cores, wound from a tape of magnetic material, placed relative to each other each other so that between them there is a winding or several windings, and the core of each of the transverse yoke is made of several distributed across the end surface and the magnetic system of the apparatus of the parts closing the rod and the lateral yoke in directions radial with respect to the axis of the rod, each of the parts transverse to the yoke made of a trapezoidal shape wound from a tape of magnetic material and with a base on the side yoke, and a nonmagnetic gap was made along the axis along the core ( 2).

The specified electric induction apparatus is free from the above disadvantages. However, it has an increased idle current due to the presence of a nonmagnetic rupture in the core of the apparatus, which reduces the contact area of the core and parts of the transverse yokes, as well as increased resistance and losses in the magnetic material, since the magnetic flux closes in the magnetic system of the apparatus mainly in the transverse directions rolling a tape of magnetic material, from which sections of the magnetic circuit of the apparatus are wound, in which the magnetic properties of the magnetic material are worse than in the rolling direction.

The aim of the present invention is to reduce the no-load current of an electro-induction apparatus and to reduce losses in the magnetic material of its magnetic system.

This goal is achieved by the fact that a non-magnetic gap in the core of the apparatus along its axis is located in the magnetic system of the apparatus against the junction of the cores of any two parts transverse with the yoke, as well as the execution of the cores of individual or all parts of the magnetic circuit of the apparatus of isotropic magnetic material.

This allows you to reduce the idling current of the apparatus and to reduce losses in the magnetic material of its magnetic system.

The proposed technical solution extends to multiphase structures of the electric induction apparatus.

Comparative analysis with the prototype shows that the claimed electro-induction apparatus is distinguished by the presence of new features, namely, the location of the non-magnetic gap against the junction of the cores of any two parts transverse with the yoke, as well as the implementation of the magnetic circuits of the magnetic system of the apparatus from isotropic magnetic material.

Thus, the claimed electric induction apparatus meets the criteria of the invention of "novelty."

In the study of other well-known technical solutions in this field, technical features that distinguish the claimed object from the prototype were not identified, which ensures the claimed object meets the criterion of "significant differences".

In figure 1. shows a single-phase transformer, section. In figure 2. - this is also the same as in Fig. 1., bottom view.

A single-phase transformer contains windings 1, a hollow cylindrical rod 2 and a lateral yoke 3, wound from a tape of magnetic material. The core of each of the transverse yokes consists of several parts 4, wound from a tape of magnetic material, closing the cores of the rod 2 and the lateral yoke 3 in directions radial from the axis of the rod. Parts 4 of the transverse yoke are distributed along the end surface of the magnetic system of the transformer. In the core of the rod 2 along its axis, a non-magnetic gap 5 is made, which is located against the junction of the cores of any two parts 4 transverse by the yoke.

Figure 3 shows a linear reactor, section.

The linear reactor in design differs from the transformer only in that it contains one winding 1 and a non-magnetic gap or gap 6 in the magnetic system. The non-magnetic gap 6 can be made either between the parts 4 of the transverse yoke and the rod 2, or only in the rod 2, or in the indicated places together.

When the primary winding of the transformer is connected to the network, a current arises in the winding, which creates a magnetic flux that closes along the rod, transverse and lateral yokes. The flux induces EMF in both the primary and secondary windings. When a load is connected to the secondary winding, a current arises in it and a certain voltage is established at its terminals.

When the winding of the linear reactor is connected to the network, a current appears in the winding, which creates a magnetic flux that closes along the rod and yokes through a non-magnetic gap. As a result, the current-voltage characteristic of the reactor becomes linear.

Experimental studies conducted on the design of an alternating current reactor showed that the use of the claimed design of electro-induction material can reduce the no-load current of the apparatus by 30% and reduce losses in the magnetic material of its magnetic system by 15-22%.

Information sources

1. Petrov G.N. Electric cars. 4.1. - M .: Energy, 1974, Fig. 2-35a, p. 77.

2. RF patent No. 2273910, IPC H01F 30/16, H01F 17/06. Electro-induction apparatus. Kovalev B.F., Shkolnikov V.A. Publ. 04/10/2006. Bull. No. 10.

Claims (4)

1. Electro-induction apparatus, mainly a transformer or linear alternating current reactor, containing a winding or several windings and an armored core, consisting of a rod, transverse and lateral yoke, the rod and side yoke made in the form of hollow cylindrical magnetic cores, wound from a tape of magnetic material, placed relative to each other in such a way that a winding or several windings are placed between them, and the core of each of the transverse yokes is made of several distributed along the end face the surface of the magnetic system of the apparatus of the parts closing the rod and the lateral yoke in directions radial from the axis of the rod, each of the parts transverse to the yoke made of a trapezoidal shape wound from a tape of magnetic material and with a base on the side yoke, and a nonmagnetic gap was made along the axis of the core of the rod along its axis characterized in that the non-magnetic gap is located against the junction of any two parts of the cores transverse with the yoke. 2. Electro-induction apparatus according to claim 1, characterized in that the core of the rod is wound from a tape of an isotropic magnetic material. 3. Electro-induction apparatus according to claim 2, characterized in that the side yoke core is wound from a tape of an isotropic material. 4. Electro-induction apparatus according to claim 3, characterized in that the cores of the transverse jug are wound from a tape of isotropic material.

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