SU1691899A1 - Liquid controlled resistor - Google Patents

Abstract

The invention relates to electrical engineering, more specifically to the design of fluid resistors. The purpose of the invention is to simplify the design and expand the scope. This goal is achieved by changing the design of the means for changing the position of the movable electrode (PE), made in the form of a tube segment. The tool is made in the form of an annular cavity, covering the outer part of the stationary electrode, filled with magnetic fluid, and an inductor, covering the annular cavity. In the magnetic fluid is an annular float, to which PE is attached. When current is supplied to the inductor, the pseudo-density of the magnetic fluid increases, which contributes to pushing out the float and changing the position of the PE and thus the resistance values. 1 il.

Description

The invention relates to electrical engineering, in particular to fluid adjustable resistors, and can be used to regulate the amount of resistance according to a certain law,

The purpose of the invention is to simplify the design and expand the scope by changing the design of the means for changing the position of the moving electrode.

The drawing shows schematically the proposed resistor.

The resistor includes a housing 1, made in the form of a segment of a cylinder, and a bottom 2. Inside the case there are a movable 3 and a stationary 4 electrodes, the clips 5 from which are brought outside of the resistor. The housing 1 is made of a non-magnetic material and is enveloped outside by an inductor 6 having clamps 7. A cavity 8, bounded by the side wall of the housing 1, the fixed electrode 4 and the bottom 2, is partially filled with magnetic fluid 9. The stationary electrode

4 is mounted on the bottom 2 and is made in the form of a reservoir partially filled with electrolyte 10. The movable electrode 3 is placed inside the fixed electrode 4 and connected by a mechanical element 11c to a float 12, which is immersed in the magnetic fluid 9.

The inductor 6 can be made in the form of an electrical winding of any design and is powered from a control unit (not shown). In this case, the control voltage can be either a voltage of industrial frequency (50 Hz) or a constant voltage.

As a magnetic fluid 9, a colloidal suspension of ferromagnetic material in mineral oil with special stabilizing additives can be used.

The float 12 can be made in the form of a hollow shell, the material for which can be, for example, plastic. To minimize resistance

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contacts 13 are provided, connected to electrode A.

The resistor works as follows

When de-energized inductor 6, the movable electrode 3 under the influence of its own weight occupies the lowest position. In this case, the contact area of the mobile electrode 3 with the electrolyte 10 is maximum and, therefore, the resistance of the resistor is minimal.

When the voltage is applied to the clamps 7 of the inductor 8, the latter flows around the current and creates a magnetic field in the area of the cavity 8 of the housing filled with magnetic fluid 9, which reacts to an increase in the magnetic field strength by increasing its pseudogeneity. This increases the Archimedean pushing force acting on the float 12. When the current in the inductor 6 reaches a certain threshold value, this force becomes sufficient to, together with the pushing force acting on the movable electrode 3, overcome the total weight of the float 12, the mechanical element 11 and the movable electrode 3. The float 12 rises, dragging the movable electrode 3. When moving the dual electrode 3 upwards, the area of its contact with the electrolyte 10 decreases and, as a result, the resistance of the resistor increases . The rise of the movable electrode 3 can continue until it comes out of contact with the electrolyte 10. In this case, the resistance of the resistor becomes infinitely large.

At a steady state current in inductor 6, float 12 stops its lift and sets at a certain height. Accordingly, the resistance of the resistor takes some steady-state value determined by the value of the current on the inductor 6.

The required volume of the float 12 can be selected by changing its geometric dimensions. This may change the size of the resistor body.

The required weight of the moving electrode 3 can be selected by changing

the material and thickness of the cylinder stacks, as well as by making this cylinder partly or completely solid.

The pseudo-density of the magnetic fluid 9 can be selected by changing its chemical composition, as well as the number of turns of the winding of the inductor 6 and the magnitude of the current in this winding.

The proposed liquid resistor can be used, for example, in birds to simulate sunrise and sunset, to start asynchronous motors with a phase rotor.

Claims (1)

Claims liquid adjustable resistor containing a stationary electrode made in the form of a cylinder, one of the ends of which is hermetically sealed to the bottom and forms a cavity for filling with an electrolyte, in which a coaxially stationary the electrode is a movable cylindrical electrode with the possibility of axial movement by means of a mechanical element with a means to change its position, in order to simplify the design and expand the scope of application, it is equipped with a dielectric body located coaxially stationary the electrode and hermetically sealed by one end with the bottom, and the inner surface of the dielectric body, the outer surface of the stationary electrolyte and the bottom form a cavity for filling with magnetic fluid, and means for changing the position of the mechanical element is made in the form of an inductor and a float that encloses the body, while the plait is fastened to the mechanical element and is located in the cavity to fill magnetic fluid. 5 5 P 3 4 W