RU2273907C1 - Transformer - Google Patents

Abstract

FIELD: electrical engineering; electric control and automation circuits.

SUBSTANCE: proposed transformer has shell-type magnetic circuit, as well as primary and secondary windings. Central leg of magnetic circuit is provided with cavity and communicates by means of pipeline through hydraulic pump with tank filled with magnetic liquid pumped to or out of cavity. Inner space of magnetic circuit communicates with atmosphere through holes provided in its wall level with upper edge of cavity.

EFFECT: ability of smooth voltage control across secondary winding within wide range at constant voltage across primary winding.

1 cl, 1 dwg

Description

The invention relates to electrical engineering and can be used in electrical control circuits and automation.

Known magnetic fluids, which are colloidal solutions of ferromagnetic particles in a binder fluid, which can be used for switching magnetic flux in magnetic shunts [1].

The disadvantage of such shunts is the lack of an adjustable electrical signal.

Also known devices for smooth voltage regulation, having a magnetic circuit with a movable yoke [2].

The disadvantage of these devices is the inability to regulate in a wide voltage range on the secondary winding.

Closest to the technical nature of the invention is a transformer, including a magnetic circuit of armor type, primary and secondary windings [3].

The disadvantage of this transformer is the inability to smoothly control the voltage in a wide range on the secondary winding with a constant voltage on the primary winding.

The purpose of the invention is the expansion of functionality by providing smooth voltage regulation in a wide range at the terminals of the secondary winding at a constant voltage on the primary winding.

The objective of the invention is achieved by the fact that the transformer is equipped with a container with magnetic fluid, and the middle core of the transformer’s magnetic circuit is hollow and connected via a pipeline through a hydraulic pump to a container with magnetic fluid, and the internal cavity of the magnetic circuit communicates with the outside air through an opening made in the wall of the magnetic circuit at upper edge of the cavity.

The middle core of the magnetic core of the transformer is made hollow in order to ensure the possibility of pumping into it or pumping out of it magnetic fluid. The inner cavity of the magnetic circuit is connected via a pipeline through a hydraulic pump to a vessel containing magnetic fluid and has an opening in the wall of the magnetic circuit to allow the transfer of magnetic fluid from the cavity to the reservoir and vice versa, thereby allowing the level of the magnetic fluid to change in the inner cavity of the magnetic circuit.

The invention is illustrated in the drawing, which shows the design of the transformer.

The transformer consists of a magnetic circuit 1 of armor type, primary 2 and secondary 3 windings, a hollow middle rod 4 filled with magnetic fluid 5, connected by a pipe 6 through a hydraulic pump 7 with a capacity of 8 containing magnetic fluid 5. There is a hole 9 in the wall of the magnetic circuit 1, by which the internal cavity of the magnetic circuit 1 communicates with the atmosphere.

The transformer operates as follows.

With a maximum injection of the cavity of the middle rod 4 with magnetic fluid 5, the magnetic resistance of the magnetic circuit 1 is minimal. The flux linkage of the primary 2 and secondary 3 windings is maximum and the voltage at the terminals of the secondary winding 3 is also maximum. In this case, the maximum injection is determined by the upper level of the surface of the magnetic fluid 5 not higher than the hole 9 in the magnetic circuit 1.

As the magnetic fluid 5 is pumped out using the hydraulic pump 7 through the pipeline 6 into the container 8, the magnetic resistance of the magnetic circuit 1 due to a decrease in the level of the magnetic fluid 5 in the cavity of the middle rod 4 and its filling with air through the opening 9 increases. The flux linkage of the primary 2 and secondary 3 windings is reduced, which, in turn, leads to a decrease in voltage at the terminals of the secondary winding 3.

Depending on the mode and direction of pumping of the magnetic fluid 5 by the hydraulic pump 7, the necessary smooth mode of voltage change at the terminals of the secondary winding 3 is provided with a constant voltage on the primary winding 2.

The free transfer of magnetic fluid 5 from the inner cavity of the middle rod 4 of the magnetic circuit 1 of the hydraulic pump 7 to the tank 8 and vice versa is ensured by free access of atmospheric air through the opening 9 into the space between the upper edge of the cavity and the surface of the magnetic fluid 5 in the middle rod 4.

The proposed solution allows for smooth regulation of the voltage of the transformer in a wide range at the terminals of the secondary winding at a constant voltage on the primary winding.

INFORMATION SOURCES

1. Rosenzweig R. Ferrohydrodynamics. - M .: Mir, 1989.

2. Copyright certificate of the USSR No. 1022229, 1983.

3. Katsman M.M. Electric cars: a textbook for avg. specialist. training institutions. - M .: VSH, 1983.

Claims (1)

A transformer containing an armored type magnetic circuit, primary and secondary windings, characterized in that it is provided with a container with magnetic fluid, and the middle core of said magnetic circuit is hollow with an internal cavity connected via a pipeline through a hydraulic pump to a container with magnetic fluid, wherein the internal cavity of said the magnetic core communicates with the atmosphere through an opening made in its wall at the level of its upper edge.