A multi-channel rotating magnetic filter magnetic circuit

Abstract

The present invention discloses a multi-channel gyromagnetic filter magnetic circuit, belonging to the technical field of magnetic device integration, which includes a lower magnetic circuit (1), an upper magnetic circuit (2), the magnetic pole columns (3) of the upper and lower magnetic circuits, a main coil (4), a compensation coil (5), a coil installation groove (6), and a multi-channel resonant circuit (7); wherein, the coil installation groove (6) is located on the end face of the upper and lower magnetic pole columns (3) and is perpendicular to the end face, dividing the end face of the magnetic pole column (3) into the number n of integrated filter channels. The compensation coil (5) is sleeved in the coil installation groove (6), and the number thereof is not less than n-1; the magnetic circuit of the present invention can achieve a frequency compensation ability of 0-200 MHz in the P-Ku band, the number of filter resonant circuit stages is not limited, and it has a wide applicability, and can cover the multi-channel integration of all gyromagnetic filters; it is beneficial to reduce the power consumption of the device; it is beneficial to control the compensation frequency modulation range and improve the reliability; and it is beneficial to control the manufacturing cost of the filter product and improve the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic device integration, and particularly relates to a magnetic circuit of a multi-channel gyromagnetic filter. Background Art

[0002] The basic structure of a gyromagnetic filter consists of a resonant circuit and a magnetic circuit. The magnetic circuit adopts a self-shielding compact structure, and the magnetic poles of the upper and lower magnetic circuits form a working air gap. l g , and the resonant circuit is placed in the working air gap. l g After the magnetic circuit coil passes through an electric current, a uniform magnetic field is generated in the working air gap. l g (The uniform magnetic field is the key to ensuring that the working frequencies of the resonators at all levels in the resonant circuit are consistent and avoiding the excitation of high-order magnetostatic modes). After the resonant circuit satisfies the resonance condition, the resonance frequency H e is mainly determined by the working air gap field. f 0 At the same time, for a spherical resonator, H e in addition to being related to f 0 , it is also related to the magnetocrystalline anisotropy field of the small ball H e , the demagnetizing field H k , and the exchange energy equivalent field H d . Therefore, the frequency consistency index after multi-channel integration of the gyromagnetic filter is affected by H a e H k , H d , H a , H e and other numerous magnetic fields.

[0003] A typical two-channel integrated design in the prior art is shown in Figure 1 , and includes a lower magnetic circuit 1, an upper magnetic circuit 2, magnetic pole columns 3 of the upper and lower magnetic circuits, a main coil 4, a hollow compensation coil 9, and an integrated resonant circuit 8. In order to ensure the consistency of the working frequencies of the two filters, the magnetic circuit unit needs precise process manufacturing accuracy to control the uniformity of the working air gap field H e . The parameters of the two resonant circuits and the process parameters also need to be highly consistent to control H k , H d , H aEffect on operating frequency. A hollow compensation coil 9 is installed at the position of the resonator of one of the filters (this coil can be installed inside the resonant circuit or bonded to the surface of the magnetic pole). By exciting the coil with current, the operating frequencies of the two filters can achieve different-frequency tracking within a certain range. At the same time, the current compensation function of the exciter can be used to compensate for the frequency tracking error.

[0004] The existing technical problems and defects mainly include:

[0005] 1) High manufacturing cost of the manufacturing plan

[0006] The process manufacturing precision of the magnetic circuit and the resonant circuit and the cost of controlling the consistency of the resonant circuit parameters are high, and the production efficiency is low;

[0007] 2) Poor magnetic field uniformity of the hollow compensation coil

[0008] The magnetic field generated inside the hollow coil has poor uniformity, which is easy to excite the high-order static magnetic modes of the resonant circuit and affects the frequency consistency of each resonator. Therefore, the hollow compensation coil is only applicable to filters with very few resonant stages;

[0009] 3) Small frequency tuning compensation range of the hollow compensation coil

[0010] Limited by the air gap or the space of the resonant circuit, the number of turns that the compensation coil can wind is small or only a small wire diameter can be used. The tuning sensitivity of the compensation coil is low and the current-carrying capacity is small, resulting in a small frequency tuning compensation range of the compensation coil;

[0011] 4) Increase in product power consumption

[0012] The FM coil has a certain thickness. Whether it is installed in the resonant circuit or bonded to the magnetic pole end face, it will increase the length of the working air gap l g , reducing the tuning sensitivity of the main coil and increasing the product power consumption. Summary of the Invention

[0013] The purpose of the present invention is to provide a magnetic circuit for a multi-channel gyromagnetic filter to solve the above problems.

[0014] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A magnetic circuit for a multi-channel gyromagnetic filter includes a lower magnetic circuit, an upper magnetic circuit, the magnetic pole columns of the upper and lower magnetic circuits, and a main coil, and further includes a compensation coil, a coil installation groove, and a multi-channel resonant circuit; wherein, the coil installation groove is located at the end face of the upper and lower magnetic pole columns and is perpendicular to the end face, dividing the end face of the magnetic pole column into the number n of filter channel integrations, and the compensation coil is sleeved in the coil installation groove.

[0015] Among them, the basic structure of the above-mentioned compensation coil is similar to that of the hollow compensation coil in the prior art, but due to the difference in the installation method of the two, the roles they play are significantly different; specifically, the "hollow compensation coil" in the prior art is installed on the surface of the magnetic pole or inside the resonant circuit, and is limited by the spatial position, and the number of turns that can be wound is limited, while the "compensation coil" of the present invention is installed in the "coil mounting groove", and a large frequency compensation capability can be designed, and the number of turns of the coil can be several times that of the coil used in the prior art.

[0016] As a preferred technical solution: the coil mounting grooves are symmetrically arranged on the upper and lower magnetic pole ends, so that the upper and lower magnetic poles form working air gaps with an integrated number of filter channels, and the multi-path resonant circuits are respectively placed in each working air gap.

[0017] As a preferred technical solution: the size of the coil installation slot meets the requirement of placing one or two compensation coils side by side.

[0018] As a preferred technical solution: the compensation coil is installed arbitrarily in the coil installation slots of the upper and lower magnetic poles.

[0019] More preferably, two compensation coils are installed in series on the magnetic poles of the upper magnetic circuit and the lower magnetic circuit respectively. This method can achieve a larger frequency compensation range, see Example 3.

[0020] As a preferred technical solution: the compensation coils are led out separately and connected to respective current exciters, so that independent frequency compensation of each partition can be achieved.

[0021] As a preferred technical solution: the number of compensation coils is determined according to the number of integrated channels and the frequency compensation range, and is not less than n-1 (n is the number of integrated filter channels). That is, the channel without compensation coils is set as the reference channel, and the frequency of the channel excited by the main coil is the reference frequency. The difference between the remaining channels and the reference frequency is compensated by their own compensation coils to achieve the consistency of the frequency of each channel.

[0022] The present invention proposes a multi-channel filter magnetic circuit structure, which is realized by slotting the end faces of the upper and lower magnetic poles to form air gap field partitions that are consistent with the number of integrated channels, and placing multi-channel integrated resonant circuits in each air gap field partition, and installing compensation coils in the slots. After being led out, each air gap field partition has an independent magnetic compensation function, thereby realizing consistent frequency compensation of the multi-channel filter;

[0023] The present invention installs the compensation coil in the end face slot of the magnetic pole, and the number of turns of the compensation coil can be increased by slot size design, thereby improving the frequency compensation capability; the compensation coil is installed in the end face slot of the magnetic pole, thereby avoiding the problem of poor uniformity of the hollow compensation coil in the prior art, achieving high uniformity of the excitation magnetic field of the compensation coil, and reducing the adverse effects on the technical indicators of the filter;

[0024] Due to the adoption of the above structure, the multi-channel filter magnetic circuit of the present invention can achieve a frequency compensation ability of 0 - 200 MHz in the P - Ku band. Compared with the prior art with a frequency modulation range of no more than 50 MHz, the present invention has very significant advantages.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] 1) The compensation coil is installed in the end face groove of the magnetic pole column. The magnetic field uniformity generated by the coil is determined by the magnetic circuit, solving the problems of poor magnetic field uniformity of the air-core coil and easy excitation of high-order magnetostatic modes. The number of stages of the filter resonant circuit is not limited, with wide applicability, and can cover the multi-channel integration of all gyromagnetic filters;

[0027] 2) The compensation coil is installed in the end face groove of the magnetic pole column, without occupying the working air gap length l g space, which is beneficial to reducing the power consumption of the device;

[0028] 3) The compensation coil is installed in the end face groove of the magnetic pole column. The sensitivity of the coil per unit turn is greater than that of the air-core coil installed in the resonant circuit or bonded to the end face of the magnetic pole, and the frequency modulation range of the compensation coil increases;

[0029] 4) The width and depth of the partition groove can be designed according to the number of turns and wire diameter of the coil, which is beneficial to controlling the compensation frequency modulation range and improving reliability;

[0030] 5) The control precision of the manufacturing accuracy of the magnetic circuit and resonant circuit and the consistency of the resonant circuit parameters is reduced, which is beneficial to controlling the manufacturing cost of the filter product and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the traditional gyromagnetic filter integration structure of the prior art;

[0032] Figure 2 is a schematic diagram of the multi-channel gyromagnetic filter magnetic circuit structure of the present invention;

[0033] Figure 3 is a schematic diagram of the four-zone design of the rectangular magnetic pole column and the installation method of the compensation coil in Embodiment 1 of the present invention;

[0034] Figure 4 is a schematic diagram of the four-zone design of the cylindrical magnetic pole column and the installation method of the compensation coil in Embodiment 2 of the present invention;

[0035] Figure 5 is a schematic diagram of the two-zone design of the rectangular columnar magnetic pole and the installation method of the compensation coil in Embodiment 3 of the present invention.

[0036] In the figure: 1. Lower magnetic circuit; 2. Upper magnetic circuit; 3. Magnetic pole column; 4. Main coil; 5. Compensation coil; 6. Coil mounting groove; 7. Multi-channel resonant circuit; 8. Integrated resonant circuit; 9. Hollow compensation coil. Specific embodiments

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] Embodiment 1: X-Ku band rectangular magnetic pole column four-channel integrated magnetic circuit

[0039] See Figure 2 and 3 , the X-Ku band rectangular magnetic pole column four-channel integrated magnetic circuit: includes a lower magnetic circuit 1, an upper magnetic circuit 2, a magnetic pole column 3 of the upper and lower magnetic circuits, a main coil 4, a compensation coil 5, a coil mounting groove 6 and a multi-channel resonant circuit 7; the coil mounting groove 6 is located at the end face of the magnetic pole column 3 of the upper and lower magnetic circuits and is perpendicular to the end face. The end faces of the magnetic pole columns 3 of the upper and lower magnetic circuits are each divided into four parts on average. The compensation coil 5 is sleeved in the coil mounting groove 6, and the number of compensation coils 5 is 3. In this embodiment, the 3 compensation coils 5 are respectively led out and connected to their respective current exciters, and independent frequency compensation for each partition can be realized. Specifically:

[0040] First, as described above, the prior art is to install a hollow coil on the magnetic pole end face or inside the resonant circuit. Since the magnetic field uniformity generated by the hollow coil is poor, it is only applicable to resonant circuits with 1-2 levels of resonators (such as Figure 1 The resonant circuit of the channel filter with a compensation coil installed shown has only 1 level of resonance), and currently, all gyromagnetic filter products use resonant circuits with 3 or more levels of resonators. The hollow coil structure cannot meet the magnetic field uniformity requirements, so the prior art is no longer applicable to the application of current multi-channel and multi-level resonant gyromagnetic filters;

[0041] Then, after the present invention forms multiple magnetic field partitions by slotting on the magnetic pole and installs the compensation coil in the coil mounting groove 6, the influence of the excitation magnetic field of the compensation coil in each partition on the other partitions is small enough to be negligible. In this embodiment, when the excitation current of the compensation coil in one magnetic partition is 50 mA, a frequency compensation of 75 MHz can be obtained in this partition. According to the principle that the magnetic fluxes of each partition are inversely proportional to the reluctances, the influence of this excitation on the frequencies of the other partitions is only on the order of dozens of kHz. Therefore, after each compensation coil is led out, "independent frequency compensation for each partition can be realized".

[0042] The four-channel resonant circuit of this embodiment is distributed in two parallel rows, using a rectangular magnetic pole column 3. The width of the coil mounting groove 6 is 2 mm, the depth is 3.5 mm, the number of turns of the compensation coil 5 is 50 turns, the tuning sensitivity of the compensation coil is 1.5 MHz / mA, and the 0-50 mA current has a frequency compensation ability of 0-75 MHz. The partition without the compensation coil in this embodiment is the reference channel partition.

[0043] Example 2: S-C Band Cylindrical Magnetic Pole Column Four-Channel Integrated Magnetic Circuit

[0044] See Figure 2 、 Figure 4 , S-C band rectangular magnetic pole column four-channel integrated magnetic circuit: including lower magnetic circuit 1, upper magnetic circuit 2, magnetic pole columns 3 of upper and lower magnetic circuits, main coil 4, compensation coil 5, coil mounting groove 6 and multi-channel resonant circuit 7; the coil mounting groove 6 is located on the end face of the magnetic pole columns 3 of upper and lower magnetic circuits and perpendicular to the end face, evenly dividing the end faces of the magnetic pole columns 3 of upper and lower magnetic circuits into four parts respectively, the compensation coil 5 is sleeved in the coil mounting groove 6, and the number of compensation coils 5 is 4. In this embodiment, the 4 compensation coils 5 are respectively led out and connected to their respective current exciters;

[0045] The four-channel resonant circuit of this embodiment is circularly distributed, uses cylindrical magnetic pole columns 3, the groove width of the coil mounting groove 6 is 2 mm, the groove depth is 4 mm, and a 4-mm deep round hole is dug in the center of the magnetic pole columns 3. The number of turns of the compensation coil 5 is 50 turns, the tuning sensitivity of the compensation coil is 1 MHz / mA, and the 0-50 mA current has a frequency compensation ability of 0-50 MHz. This embodiment uses four compensation coils, with high flexibility and can adapt to any adjustment of the reference channel in production.

[0046] Example 3: S-C Band Rectangular Magnetic Pole Column Two-Channel Hetero-Frequency Tracking Magnetic Circuit

[0047] See Figure 2 、 Figure 5 , S-C band rectangular magnetic pole column two-channel hetero-frequency tracking magnetic circuit: including lower magnetic circuit 1, upper magnetic circuit 2, magnetic pole columns 3 of upper and lower magnetic circuits, main coil 4, compensation coil 5, coil mounting groove 6 and two-channel resonant circuit 7; the coil mounting groove 6 is located on the end face of the magnetic pole columns 3 of upper and lower magnetic circuits and perpendicular to the end face, evenly dividing the end faces of the magnetic pole columns 3 of upper and lower magnetic circuits into two parts respectively, the compensation coil 5 is sleeved in the coil mounting groove 6, the number of compensation coils 5 is 2, and they are respectively located in the coil mounting grooves in the same partition of the upper and lower magnetic poles and are connected in series according to the same current flow direction. In this embodiment, the serially connected upper and lower compensation coils 5 are led out and connected to a current exciter;

[0048] The two-channel resonant circuit of this embodiment is arranged in parallel, uses rectangular magnetic pole columns 3, the groove width of the coil mounting groove 6 is 3 mm, the groove depth is 4 mm, the number of turns of a single compensation coil 5 is 100 turns, and the total number of turns of the upper and lower two compensation coils is 200 turns. After being connected in series, the tuning sensitivity is 4 MHz / mA, and the 0-50 mA current has a frequency offset compensation ability of 0-200 MHz, and hetero-frequency tracking of the frequencies of the two filters from 0 to 200 MHz can be realized.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention, such as different numbers of channels, different shapes of magnetic pole columns, different depths and widths of the coil mounting grooves, different numbers of coil turns, and frequency compensation ranges, should all be included within the protection scope of the present invention.

Claims

1. A multi-channel rotating magnetic filter magnetic circuit, comprising a lower magnetic circuit (1), an upper magnetic circuit (2), magnetic pole columns (3) of the upper and lower magnetic circuits, and a main coil (4), characterized in that: It further includes a compensation coil (5), a coil installation groove (6), and a multi-channel resonance circuit (7); wherein, the coil installation groove (6) is located on the end faces of the upper and lower magnetic pole columns (3) and is perpendicular to the end faces, dividing the end faces of the magnetic pole columns (3) into the number n of filter channel integrations, and the compensation coil (5) is sleeved in the coil installation groove (6); after the compensation coils (5) are respectively led out, they are connected to their respective current exciters, so as to realize independent frequency compensation for each partition.

2. The multi-channel gyromagnetic filter magnetic circuit according to claim 1, characterized in that: The coil installation grooves (6) are symmetrically arranged on the upper and lower magnetic pole end faces, so that the upper and lower magnetic poles form a working air gap with the number of filter channel integrations, and the multi-channel resonance circuits (7) are respectively arranged in each working air gap.

3. The magnetic circuit of a multi-channel gyromagnetic filter according to claim 1, characterized in that: The size of the coil installation groove (6) meets the requirement for arranging one or two compensation coils (5) side by side.

4. A multi-channel gyromagnetic filter magnetic circuit according to claim 1, characterized in that: The compensation coils (5) are arbitrarily installed in the coil installation grooves (6) of the upper and lower magnetic pole columns, or two compensation coils (5) are respectively installed on the magnetic pole columns (3) of the upper magnetic circuit and the lower magnetic circuit and then connected in series.

5. The magnetic circuit of a multi-channel rotating magnetic filter according to claim 1, characterized in that: The number of the compensation coils (5) is determined according to the number of channel integrations and the frequency compensation range, and is not less than n - 1.

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