JPH0686321U - Air core choke coil - Google Patents

Abstract

(57) [Abstract] [Purpose] A conventional air-core choke coil is formed by a so-called solenoid winding that is long in the axial direction. Therefore, when increasing the reactance, increase the number of windings or connect multiple windings in series. It is necessary to take measures such as, and in this case, the inductance increases at most in proportion to the number of turns, the number of turns, etc., and the overall shape becomes considerably large,
It occupies a lot of space, and the winding resistance increases more than necessary, resulting in poor Q. The present invention seeks to solve this. [Structure] A plurality of spiral coils 1 and 2 having the same or substantially the same number of turns are concentrically adjacent to each other, and are connected in series so that magnetic fluxes produced by these spiral coils are generated in the direction of addition. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air core choke coil.

[0002]

[Prior art]

 Conventional air core choke coils are generally formed by so-called solenoid winding long in the axial direction, as shown in FIG.

[0003]

[Problems to be solved by the device]

 However, in order to increase the reactance in such a form, it is necessary to take measures such as increasing the number of turns or connecting a plurality of turns in series, and as a result, the inductance is at most proportional to the number of turns and the number of turns. As a whole, its form becomes quite large and it occupies a lot of space. The winding resistance increases more than necessary, and Q (Q = ωL / Rω: angular velocity L: inductance R: winding resistance) deteriorates. And other problems arise. The present invention is intended to solve such a problem, and is intended to enable miniaturization and flattening and improve Q.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the invention of claim 1 is characterized in that the winding is wound in a spiral shape and is solidified with an insulating adhesive material. According to the invention of claim 2, a plurality of spiral coils having the same or almost the same number of turns are concentrically adjacent to each other, and are connected in series so that magnetic fluxes produced by the spiral coils are generated in a direction in which they are added to each other. It is characterized by

[0005]

With the above structure, the spirally wound air-core choke coil according to claim 1 can be used in a single layer or a plurality of layers, and therefore can be downsized and flattened. In addition, the air-core choke coil according to claim 2 can be realized. In the air-core choke coil of claim 2, in addition to the self-inductance of each spiral coil, mutual inductance due to mutual induction is generated between the spiral coils, and the mutual inductance between the spiral coils is a plurality of spiral coils. Since the magnetic flux generated by the spiral coil is added, the magnetic flux becomes remarkably large according to the number of coils, and becomes maximum when the spiral coils are in close contact with each other. Thus, the total inductance is the sum of the self-inductances of each spiral coil plus such a sum of mutual inductances. Then, the self-inductance of one spiral coil is multiplied by almost the square of the number of coils, resulting in an extremely large value. It should be noted that this value can be adjusted arbitrarily because the mutual inductance decreases and becomes smaller by separating the spiral coils from each other. Further, as compared with such total inductance, the winding resistance is limited to that of the whole spiral coil, so that the Q can be remarkably improved.

[0006]

【Example】

 1 to 3 show an embodiment of the present invention. The one shown in the figure has two spiral coils 1 and 2 with the same or almost the same number of turns and the winding directions opposite to each other, and they are concentrically adjoined to each other, and the magnetic fluxes produced by both coils are added. Both core parts are connected in series so as to occur in any direction. Specifically, both spiral coils 1 and 2 are integrally and two-layered in such a manner that the midpoint of one winding is located at the winding core and both sides are spirally wound in mutually opposite directions. And then solidify with an insulating adhesive. For example, if the self-inductances of both spiral coils 1 and 2 are respectively set to 4 μH and both spiral coils are brought into close contact with each other as shown in the drawing to generate the maximum mutual inductance, the total inductance becomes approximately 16 μH, which is about 2 Doubled. In consideration of workability, twisted wires may be used to form the spiral coils 1 and 2. In the above embodiment, the two spiral coils 1 and 2 are used, but the number thereof is arbitrary and the adjustment of the spacing is also arbitrary as long as the generated magnetic fluxes are in an additive state.

[0007]

[Effect of device]

 According to the invention of claim 1, since it is wound in a spiral winding, it can be used in a single layer or a plurality of layered layers, whereby the form can be downsized and flattened. It is possible to obtain an excellent air core choke coil. Further, according to the invention of claim 2, a plurality of spiral coils having the same or almost the same number of turns are concentrically adjacent to each other, and are connected in series in such a manner that magnetic fluxes produced by these spiral coils are added to each other. Therefore, a mutual inductance that greatly increases depending on the number of coils can be generated between the spiral coils, and the sum of the mutual inductance and the total of the self-inductance of each spiral coil can be added to reduce the total inductance. Inductance can be made large with a marked increase according to the number of coils. Therefore, the form can be downsized and flattened, and the occupied space can be greatly reduced. Furthermore, despite the increase in inductance, the winding resistance is limited to the amount of the spiral coils 1 and 2, so that Q can be significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an air-core choke coil according to the present invention.

FIG. 2 is a vertical sectional side view of the same example.

FIG. 3 is an explanatory diagram of a configuration procedure of the same example.

FIG. 4 is a perspective view showing a conventional example.

[Explanation of symbols]

 1, 2 ... spiral coil

Claims (2)

[Scope of utility model registration request] 1. An air-core choke coil characterized in that a winding is wound in a spiral shape and is fixed by an insulating adhesive. 2. A plurality of spiral coils each having the same or substantially the same number of turns are concentrically adjacent to each other, and are connected in series so that magnetic fluxes produced by the spiral coils are generated in an adding direction. Air core choke coil