JPH0636403B2 - Linear variable reactor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a linear variable reactor in which the inductance of a main winding can be changed by the value of an exciting current of a control winding.

[Prior Art] As is well known, there are various types of conventional reactors such as an iron core type, an air core type, and an iron core type with a gap.
Each of the inductances is determined to have a unique value depending on the number of turns and the size of the windings forming the reactor and the material, shape and size of the magnetic circuit. For this reason, for example, in reactor control in a static var compensator or the like, the semiconductor switching element controls the on / off control of the inflow current to the reactor to control the effective value of the reactor inflow current. The inductance of the reactor, which is the essence of, is constant.

[Problems to be Solved by the Invention] As described above, the conventional reactor has a problem that its inductance is unique and a desired inductance cannot be obtained according to need.

Therefore, the present invention has been made in consideration of the above circumstances, and is an extremely good linearly feasible reactor capable of changing the inductance of the main winding of the orthogonal magnetic core structure as the reactor depending on the value of the exciting current of the control winding. The purpose is to provide.

[Means for Solving the Problems] A linearly movable reactor according to the present invention has a first U-shaped cut core around which a main winding is wound, and a control winding is wound inside from a substantially central portion of a cut end face. A second U-shaped cut core in which a substantially V-shaped gap is formed toward one side, the cut surfaces thereof face each other, and the other cut core is twisted with respect to one cut core. The inductance of the main winding is changed by bringing them into contact with each other while rotating them by 90 ° and changing the value of the exciting current of the control winding.

[Operation] According to the configuration as described above, first, by applying a voltage to the main winding, the first and second U-shaped cut cores form a V-shaped magnetic circuit with a gap. On the other hand, by applying a voltage to the control winding, a closed magnetic circuit having no gap is formed by the first and second U-shaped cut cores, and this closed magnetic circuit is excited by a small current. Then, the magnetic flux due to the main winding passing through the V-shaped gap of the V-shaped magnetic circuit with a gap is controlled by the exciting current of the control winding, and a magnetic flux control equivalent to that of adjusting the gap of the V-shaped magnetic circuit with a gap is performed. Then, the inductance of the main winding is changed. Therefore, the inductance of the main winding can be changed by changing the value of the exciting current of the control winding by external control.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 1, 11 is a first U-shaped cut core around which a main winding 12 is wound. In addition, 1 in the figure
Reference numeral 3 is a second U-shaped cut core, around which the control winding 14 is wound. Further, in the second U-shaped cut core 13,
A substantially V-shaped gap 15 is formed inward from the substantially central portion of the cut end surface. And these first
The second U-shaped cut cores 11 and 13 have their cut surfaces opposed to each other, and the first U-shaped cut core 1
The second U-shaped cut core 13 with respect to 1 in the twisting direction
They are in contact with each other while rotated by 0 °. Note that FIG. 2 shows an equivalent circuit in the structure shown in FIG.

Here, the alternating voltage e1 is applied to the main winding 12, and the current il
Flows in the direction of the arrow in the drawing, the magnetic circuit with the V-shaped gap is formed by the both ends of the first U-shaped cut core 11 and the both ends of the second U-shaped cut core 13.
A magnetic flux 1 is generated as indicated by a dotted arrow in the figure. In this case, a part of the magnetic flux 1 is part of the second winding of the control winding 14.
However, since the second U-shaped cut core 13 is rotated by 90 ° in the twisting direction with respect to the first U-shaped cut core 11, the induced voltage is applied to the control winding 14. Is not generated. Then, by applying the alternating voltage e1 to the main winding 12, the alternating voltage e is applied to the main winding 12 by 9%.
An alternating current with a delay of 0 ° flows.

In addition, a constant voltage e2 is applied to the control winding 14 so that the current i2
Flows in the direction of the arrow in the figure, both ends of the second U-shaped cut core 13 and both ends of the first U-shaped cut core 11 form a closed magnetic circuit having no gap.
A magnetic flux 2 is generated as shown by a dotted arrow in the figure. Also in this case, a part of the magnetic flux 2 is applied to the first U-shaped cut core 11 around which the main winding 12 is wound, but the second U-shaped cut core 13 is connected to the first U-shaped cut core 11. Since it is rotated by 90 ° in the twisting direction, no induced voltage is generated in the main winding 12.

Here, in the portion of the V-shaped gap 15 which is a part of the magnetic circuit of the magnetic flux 1 formed by applying the alternating voltage e1 to the main winding 12, the passage position of the magnetic flux 1 flows to the control winding 14. _1-1 ~ depending on the value of the excitation current
The magnetic flux control is performed between _{1 and 4} and the same magnetic flux control as that in which the gap interval of the V-shaped gap 15 is adjusted is performed.
The inductance of 2 will be changed linearly. Therefore, as shown in FIG. 3, by changing the exciting current of the control winding 14 by external control, the main winding 12
The inductance of can be changed linearly.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to change the inductance of the main winding of the orthogonal magnetic core structure serving as a reactor according to the value of the exciting current of the control winding, which is a very good linear variable. A reactor can be provided.

[Brief description of drawings]

1 and 2 are respectively a perspective view showing an embodiment of a linear variable reactor according to the present invention and a circuit configuration diagram showing an equivalent circuit thereof, and FIG. 3 is a control winding exciting current and main winding of the embodiment. It is a characteristic view which shows the relationship with a line inductance. 11 ... 1st U-shaped cut core, 12 ... Main winding, 13 ... 2nd U-shaped cut core, 14 ... Control winding, 15 ... Gap.

Claims (1)

[Claims] 1. A first U-shaped cut core around which a main winding is wound, and a control winding around which a substantially V-shaped gap is formed from a substantially central portion of a cut end face toward the inside. The second U-shaped cut core is brought into contact with the other cut surfaces in such a manner that their cut surfaces face each other and the other cut core is rotated by 90 ° in the twisting direction, and the control winding A linear variable reactor characterized in that the inductance of the main winding is changed by changing the value of the exciting current of the wire.