JPH04354310A - Adjustment of inductance of derivative - Google Patents

Abstract

PURPOSE:To provide the easy and economic method for adjusting an inductance of a derivative by which any continuous inductance can be adjusted easily. CONSTITUTION:In this method, a first magnetic circuit 12 around which a first coil 11 is wound and a second magnetic circuit 14 around which a second coil 13 is wound are used. The two circuits are so located as a part of the first magnetic circuit may pass through the second magnetic circuit. An inductance of the first magnetic circuit is adjusted by controlling dc current to be passed through the second coil for allowing a magnetic flux generated by the coil to restrict a magnetic flux which passes through the first magnetic circuit at the place where the first magnetic circuit passes through the second magnetic circuit.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the inductance of a dielectric, which allows the inductance of a dielectric to be adjusted arbitrarily and continuously.

0002

[Prior Art] Generally, the inductance of a derivative is (
N) is given by 2S・E0・ES/L. Here, N is the number of turns of the first winding, S is the cross-sectional area of the magnetic circuit, L is the magnetic path length of the magnetic circuit, E0 and ES
are the vacuum magnetic permeability and the relative magnetic permeability of the magnetic material, respectively. Therefore, if it is desired to change the inductance, it is sufficient to change each of the above elements. For example, when changing the inductance without changing the external dimensions or the number of turns N of the magnetic body, the inductance can be adjusted only by changing the relative magnetic permeability ES. For this reason, conventionally, when an iron core is used as a magnetic material, in order to change the equivalent relative magnetic permeability of the iron core, a gap is provided in the iron core and the size of the gap is adjusted. A method is known in which the inductance of the iron core is adjusted.

0003

[Problems to be Solved by the Invention] However, in the method of adjusting the size of the gap of the iron core, it is difficult to adjust the relative magnetic permeability of the iron core to an arbitrary value or to adjust it continuously. The only way to adjust the gap is mechanically, which makes the adjustment device complicated and relatively large, which poses a problem in terms of cost.

In view of the above points, it is an object of the present invention to provide a method for adjusting the inductance of a dielectric, which can be constructed simply and at low cost, and can easily and arbitrarily and continuously adjust the inductance. The purpose is

[0005]

[Means for Solving the Problem] In order to achieve the above object, a method for adjusting the inductance of a dielectric according to the present invention provides a first magnetic circuit around which a first winding is wound, and a second magnetic circuit around which a first winding is wound. a second magnetic circuit that is wound, a part of the first magnetic circuit passing through the second magnetic circuit, and a part of the first magnetic circuit passing through the second magnetic circuit; controlling the direct current flowing through the winding to limit the magnetic flux generated by the winding passing through the first magnetic circuit at a portion where the first magnetic circuit passes through the second magnetic circuit; The present invention is characterized in that the inductance of this first magnetic circuit is adjusted by.

[0006]

[Operation] According to the above method, by passing a direct current through the second winding, magnetic lines of force corresponding to the current value are generated in the second magnetic circuit. The portion passing through the second magnetic circuit also passes through the first magnetic circuit. When current flows through the first winding in this state, magnetic lines of force are generated in the first magnetic circuit, but in the part that passes through the second magnetic circuit, the lines of magnetic force generated in the second magnetic circuit are , the lines of magnetic force generated in the first magnetic circuit are repelled by the lines of magnetic force generated in the second magnetic circuit at this portion. As a result, the current flows outward from the first magnetic circuit and passes through the air at a rate corresponding to the value of the current flowing through the second winding. Therefore, the inductance of the second magnetic circuit is
It will be possible to adjust based on the value of the current flowing through that second winding. Therefore, according to the present invention, inductance can be arbitrarily and continuously adjusted with a simple configuration and at low cost.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of an inductance adjusting device to which the method according to the present invention is applied. In FIG. 1, an inductance adjustment device 10 includes a first magnetic circuit 12 around which a first winding 11 is wound, and a second magnetic circuit 14 around which a second winding 13 is wound. A part of the first magnetic circuit 12 is arranged so as to be perpendicular to the second magnetic circuit 14 at a portion indicated by the symbol A in the drawing.

The inductance adjusting device 10 to which the method of the present invention is applied is constructed as described above, and the second winding 13
By passing a direct current from the power source 15 through the variable resistor 16, lines of magnetic force are generated in the second magnetic circuit 14 according to the current value. Here, the magnetic lines of force also pass through the first magnetic circuit 12 at a portion A where the first magnetic circuit 12 passes through the second magnetic circuit 14 . In this case, the amount of the magnetic lines of force can be adjusted by appropriately adjusting the variable resistor 16.

In this state, when a current is applied to the first winding 11 from a power source (not shown), magnetic lines of force are generated in the first magnetic circuit 12, but in the portion A that passes through the second magnetic circuit 14, , since the lines of magnetic force generated in the second magnetic circuit 14 have already passed through, the lines of magnetic force generated in the first magnetic circuit 12 in the part A are caused by the lines of magnetic force generated in the second magnetic circuit 14. Due to the repulsion, the amount of passage is limited. Therefore, the lines of magnetic force generated in the first magnetic circuit 12 in the area of part A protrude from the first magnetic circuit 12 to the outside at a rate corresponding to the current value flowing through the second winding 13. As a result, the inductance of the first magnetic circuit can be adjusted based on the value of the current flowing through the second winding 13. For example, if the lines of magnetic force passing through the second magnetic circuit 14 exceed the saturation magnetic flux density in part A, no more lines of magnetic force can pass through this part A, and therefore the first magnetic circuit All lines of magnetic force that pass through 12 try to pass through space. In this case, the state corresponds to the maximum gap.

[0010] Here, when the variable resistor 16 is adjusted to make the current value flowing through the second winding 13 zero, no lines of magnetic force are generated in the second magnetic circuit 14, so that the first magnetic circuit 12 is The passing magnetic lines of force are not restricted in any way by the portion A, and therefore do not protrude from the first magnetic circuit 12 and pass through the space.
This results in a state corresponding to the minimum gap.

FIG. 2 shows another embodiment of the inductance adjustment method according to the present invention. This inductance adjustment device 10 has a gap 12a provided in the first magnetic circuit 12, and the second magnetic circuit 14 is in contact with the first magnetic circuit 12 in the region of this gap 12a. , in the vicinity of the gap 12a, the first magnetic circuit passes through the second magnetic circuit 14, sharing the part indicated by the symbol B in the drawings, except that they intersect in parallel. , has the same structure as the embodiment shown in FIG. 1, and its operation is also the same. In addition, in the above embodiment, the first magnetic circuit 12 and the second magnetic circuit 14 are
It is clear that the magnetic circuits 12 and 14 may be constructed of different materials, and in that case, the inductance adjustment range can be changed arbitrarily by appropriately selecting the relative magnetic permeability of each magnetic circuit 12, 14.

0012

[Effects of the Invention] As described above, according to the present invention, by passing a direct current through the second winding, magnetic lines of force are generated in the second magnetic circuit according to the current value, and these lines of magnetic force are The portion where the first magnetic circuit passes through the second magnetic circuit also passes through the first magnetic circuit. When current is passed through the first winding in this state, the lines of magnetic force generated in the second magnetic circuit are passing through the second magnetic circuit, so the first winding is flowing through the second magnetic circuit. The lines of magnetic force generated in the magnetic circuit are repelled by the lines of magnetic force generated in the second magnetic circuit, so that they protrude outside from the first magnetic circuit at a rate corresponding to the current value flowing through the second winding and fly into the air. It will pass. Therefore, the inductance of the second magnetic circuit can be adjusted based on the value of the current flowing through the second winding, and the inductance can be arbitrarily and continuously adjusted with a simple configuration and at low cost. It will be. Thus, according to the method of the present invention, an extremely excellent method for adjusting the inductance of a dielectric is provided, which can be constructed simply and at low cost, and can easily perform arbitrary and continuous inductance adjustment. .

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of an inductance adjusting device constructed by the method of the present invention.

FIG. 2 is a schematic diagram showing another embodiment of an inductance adjusting device constructed by the method of the present invention.

[Explanation of symbols]

10 Inductance adjustment device 11 First winding 12 First magnetic circuit 13 Second winding 14 Second magnetic circuit 15 Power supply 16 Variable resistance

Claims (1)

[Claims] Claim 1: The first magnetic circuit includes a first magnetic circuit around which a first winding is wound, and a second magnetic circuit around which a second winding is wound. A part of the circuit is arranged to pass through the second magnetic circuit, and controls the direct current flowing through the second winding so that the first magnetic circuit is connected to the second magnetic circuit. The inductance of the first magnetic circuit can be adjusted by restricting the magnetic flux generated by the winding that passes through the first magnetic circuit. How to adjust the inductance of a dielectric.