CN201000806Y - Variable inductor - Google Patents

Abstract

The utility model relates to a variometer which is winded by enamel insulated wire or cotton insulated wire, the winded coil has a 0.5-4 mm clearance, the diameter of the enamel insulated wire or cotton insulated wire used is 1-4 mm, and no magnetic core is used. Because a 0.5-4 mm clearance is left, the inductance quantity can be increased when the clearance is closed. The utility model suitable to all the frequency of the short wave and the ultrashort wave radio station, the power, quality factor Q, magnetic conductibility Mu is determined by the diameter and the skin of paint of the enamel insulated wire and the cotton insulated wire, thereby the parameter is quite steady and can be affected by the size of the clearance between the coil during the debugging, and the mutual inductance problem can be eliminated when the placing position of the utility model in the electric circuit is considered. The utility model has a high degree of adaptability for the parameter requirements of the inductor, the structure is simple, the performance is reliable, the production is convenient, and the cost is low because no magnetic core is used.

Description

Variable inductor

Technical field

The utility model relates to inductor, is specifically related to a kind of inductor that changes inductance value.

Background technology

Circuit design, especially in the radio circuit design, it is a lot of that inductance component uses, select for use many frequency, power, quality factor Q, magnetic permeability mu, the temperature of inductance to wait and select core material according to design, turning to inductance with enamelled wire again, is to be difficult to realize but want to satisfy fully simultaneously above index.Meet the requirements such as temperature coefficient, the μ value does not but reach standard, or the Q value improved, but can not bear the required power of circuit design.And because the effect of magnetic core also can produce mutual inductance.Also have the volume problem of inductance element in addition, the magnet ring size of Xiao Shouing has standard in the market, during use the size of magnet ring big fail to lay down in the machine, size is little, and inductance value does not reach requirement again; Coil inductance is general all to have confidential relation with the size of magnet ring, therefore there is not spatial margin to carry out the adjusting of size, the designer often will customize inductance especially to meet the design parameter, usually in order to debug the magnet ring that need also will customize different size, such expense is several thousand yuan of units up to ten thousand at most at least.

Summary of the invention

The purpose of this utility model is: a kind of variable inductor is proposed, and in view of the importance of inductance element on circuit, and the problem that in use runs into, provide a kind of simple in structure, stable performance, convenient and practical inductance value variable inductor.

The utility model is formed by enamelled wire or cotton covered wire coiling, comprises inductance coil 1 and space 2, and the 0.5-4mm space is arranged between the coil of coiling, and used enamelled wire or cotton covered wire diameter are 1-4mm, do not use magnetic core.Owing to leave the 0.5-4mm space, by changing the inductance value size that gap length between the coil can change inductor, the space can make inductance value increase when closed, during adjusting as long as the space closure can be increased inductance value.

The utility model is suitable for shortwave and ultrashort wave radio set radiating circuit inductance, frequency, its power, quality factor Q, magnetic permeability mu etc. all are that diameter and the enamelled coating by enamelled wire or cotton covered wire self determined, therefore these parameters are all very stable, can not be subjected to the influence that the winding space size changes during debugging, and the utility model just the mutual inductance problem can not appear as long as note the direction of placing in circuit.

The utility model requires the fitness height to the inductor parameters, and simple in structure, dependable performance is convenient for production, does not use magnetic core thereby cost lower.

Description of drawings

Fig. 1 is a stereogram of the present utility model.

Embodiment

Shown in Figure 1, inductance coil 1, space 2.

According to the size of actual usage space, select the different pole of diameter, material is not limit, as anchor clamps.Enamelled wire coiling on pole of selecting required specification for use according to factors such as frequency, temperature, power again is by formula $\frac{L_1}{{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="Y20062017087500051.png"\; state="\{\{state\}\}">L</figure-callout>}}_2}=\frac{N_1^2}{{\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="Y20062017087500051.png"\; state="\{\{state\}\}">N</figure-callout>}}_2^2},$ Calculate the corresponding number of turns, take out pole after coiling is finished and get final product, as shown in Figure 1.Illustrate below.

The variable inductor of one 0.2～0.8 μ H, quality factor Q 〉=150, length is no more than 30mm.With the pole of diameter 20 mm, material is not limit, as anchor clamps.According to result of calculation and power, temperature requirement, the QY enamelled wire of selecting a Φ 1.4mm for use around the 10-12 circle, stays the 1-1.5mm gap between the coil on pole, take off pole after coiling is finished, and obtains inductance.Can be as required during enforcement, gap length satisfies the requirement of the inductor size and the number of turns between the thickness of alignment jig and coil, and the thick more power that can bear in enamelled wire line footpath is big more.On the coiling inductance coil anchor clamps (round bar shape or rod shape) equally distributed projection is arranged, per share line all is wound between the projection, and the round bar shape anchor clamps can rotate.

When the utility model uses, with inductor two lead-in wire coating removal and wicking, be welded in flatiron on the assigned position of printed board, in the process of debugging, can change its inductance value by applying external force change winding space size, widening the gap diminishes inductance value, reducing the gap makes the inductance quantitative change big, the power of its inductor, quality factor Q, magnetic permeability mu etc. are determined by the diameter and the enamelled coating of enamelled wire self, therefore these parameters are all very stable, can not be subjected to the influence that the winding space size changes during debugging.When obtaining needed inductance value, get final product with resistant to elevated temperatures insulating cement is fixing.

Claims (2)

1, variable inductor is formed by enamelled wire or cotton covered wire coiling, comprises inductance coil (1) and space (2), it is characterized in that the 0.5-4mm gap is arranged between the inductance coil.

2,, it is characterized in that enamelled wire or cotton covered wire diameter are 1-4mm according to the described variable inductor of claim 1.

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