SU1624546A1 - Variable-ratio transformer - Google Patents

Abstract

The invention relates to electrical engineering, namely adjustable transformers. The purpose of the invention is to increase the smoothness of the regulation. The adjustable transformer contains a magnetic core 1 with two movable parts 2 in the direction perpendicular to the plane of the magnetic conductor, the primary and secondary 4 windings, with one turn of the winding connected on both sides to the ferromagnetic elements 5 contained in the movable parts 2 isolated by insulating 6, and constituting part of said coil. When moving the moving parts, the magnetic flux is redistributed between the parts of the sections, which changes the flow penetrating the last turn of the secondary winding and, accordingly, the secondary voltage varies smoothly within the EMF of one turn. 2 Il.

Description

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The invention relates to electrical engineering, namely adjustable transformers.

The purpose of the invention is to increase the smoothness of the regulation.

FIG. 1 shows an armored transformer; in fig. 2 shows section A-A in FIG. one.

A transformer for smoothly regulating the output voltage within the EMF of one coil (Fig. 1 and 2) contains laminated magnetic circuit 1 with moving sections 2, primary 3 and secondary 4 windings (armor type transformer is shown as an example). Each movable section 2 contains a magnetic element 5, which is one or more plates of magnetically soft ferromagnetic material. Element 5 is oriented in the same way as magnetic core plates. Element 5 is isolated from the rest of the movable section 2 by spacers 6, the thickness of which does not exceed the thickness of the usual insulation of a laminated magnetic circuit. The magnetic element 5 is also isolated from the magnetic circuit 1. The element 2 is moved (as shown by arrows) in the direction perpendicular to the plane of the magnetic circuit (in Fig. 2, element 5 is shown in its average position). One of the turns of the secondary winding 4 is connected to the element 5 from opposite sides with respect to the cross section.

The transformer works as follows.

If the magnetic elements 5 are at the level of the front surface of the main magnetic circuit 1, then the output voltage is reduced by almost the value of the EMF of one full turn. With a smooth upward displacement (Fig. 2) of the movable section 2, the secondary voltage gradually increases.

In the position shown in FIG. 2, the output voltage has an average value. If we continue to displace section 2 until the moment when element 5 is equal to the back surface of magnetic circuit 1, then the secondary voltage gradually increases to almost its maximum value. This is caused by the fact that during the movement of the sections 2 described above, the magnitude of the part of these sections of the magnetic flux passing through the covered winding 4 gradually changes (in Fig. 2 the covered parts are those parts of section 2 that are located below the elements 5) .

Claims (3)

1. Adjustable transformer containing laminated magnetic core, primary and secondary windings, with one turn of one of the windings covering an incomplete cross section of the magnetic core, and the magnetic conductor contains a longitudinal insulated ferromagnetic element, at least in one section with which the specified turn is connected, forming part the latter, characterized in that, in order to increase the smoothness of the adjustment, the magnetic circuit section containing the ferromagnetic element is made movable in a direction perpendicular to magnetic circuit. 2. A transformer according to Claim 1, characterized in that the magnetic conductor is armored, the ferromagnetic elements comprise both side rods, the contact surfaces of the side rods and the rest of the magnetic conductor lying in parallel planes. 3. Transformer on PP. 1 and 2, that is, the thickness of the movable section is 1-2 times the thickness of the fixed part of the magnetic circuit. one j FIG. one