SU743053A1 - Vaiable capacitor - Google Patents

Description

(54) CAPACITOR OF A VARIABLE CAPACITY

I

The invention relates to the field of electrical engineering and automation of process control and can be used as a variable capacitor and sensor for the change of electric current in control and measurement circuits.

A variable capacitor capacitance structure is known, comprising a hermetic dielectric body, the internal cavity of which is sealed with a liquid dielectric or gas ll.

The disadvantage of this capacitor is the cumbersome design.

The closest to the technical essence of the achieved result to the proposed is the capacitor of the transverse capacity, containing a dielectric-filled case made in the form of a cylinder of a dielectric material and metal electrodes 21.

The disadvantage of this capacitor is that two liquids are used as dielectric.

To change its capacity, these liquids are pumped from special rather bulky tanks. In addition, this capacitor cannot be used as a sensor for the change of electric current in a controlled circuit.

The purpose of the invention is to expand the functionality.

For this, the known variable capacitor, containing a dielectric-filled housing made in the form of a cylinder of a dielectric material and metal electrodes, is equipped with a magnetic circuit with a winding and insulating spacers fixed

IS on the housing located inside the magnetic core, and as the dielectric Kcnontf is called ferromagnetic fluid.,

The drawing shows the proposed

20 capacitor.

Claims (2)

The capacitor contains a housing made in the form of a cylinder 1 made of a dielectric material and metal epec 374 electrodes 2. The internal cavity between the electrodes 2 is filled with ferromagnetic liquid 3. Condensate from metal electrodes 2 (conclusions go to 4 electrodes). winding 7. A winding current of the electromagnet flows through the winding 7. When current flows through the winding of the electromagnet, the capacitor is in a magnetic field whose induction is determined by the current in the winding. In this case, ferromagnetic particles in a liquid are attracted to each other and are oriented in chains in the direction of the magnetic field. For each particular liquid, the distance between the particles is determined by the magnitude of the magnetic induction, m, that is, ultimately the current in the electromagnet coil, and The inter-particle detection determines the capacitor capacitance. When the electromagnet is turned on into a controlled circuit, each change in current in the circuit results in. a change in the induction of the magnetic field of an electromagnet, and therefore a change in the capacitance of the capacitor. With increasing current in the winding of the electromagnet, the capacitor capacity increases. and decreases with decreasing. 4 Therefore, the change in the current in the controlled circuit can be judged by the change in the capacitor capacitance, which confirms the possibility of using a variable capacitor as a sensor for the change in electric current in the controlled circuit. Claims of variable capacitor,. containing a dielectric-filled housing made in the form of a cylinder of dielectric material and metal electrodes, characterized in that, in order to expand its functionality, it is equipped with a magnetic conductor with a winding and insulating spacers fixed to the housing located inside the magnetic core, and as a dielectric ferromagnetic fluid is used. Sources of information taken into account in the examination 1. USSR author's certificate number 51O755, cl. H 01 Q 7 / O4, 1976. 2. USSR author's certificate number 337837, cl. H 01Q 5/20, 1972 {prototype).