A high-density coil-based vibration transducer device

Abstract

A kind of high-density coil-based vibration transducer, the upper part of the transduction structure support is provided with A vibration pickup beam, the lower part of the transduction structure support is fixed B vibration pickup beam, A vibration pickup beam and B vibration pickup beam are provided with permanent magnet, the top cover center of transduction structure support is provided with upper laminated flexible coil, the bottom end center of the shell base below B vibration pickup beam is provided with lower laminated flexible coil;The positive and negative poles of upper laminated flexible coil and lower laminated flexible coil are connected to the electrode sheet of line lead-out terminal in cascaded manner, lead-out terminal is fixed at the center reserved hole of shell top cover, shell top cover and shell base are adapted to form vibration transducer shell together;The present application adopts double-beam plus double-coil output, reduces the transverse vibration of device;Improve device sensitivity, change the previous magnet through-type structure of magnetoelectric transduction structure using winding coil, adopt the upper and lower integrated mode of magnet and coil, effectively reduce the overall size of device.

Description

Technical Field

[0001] This invention relates to the field of magnetoelectric vibration transducer technology, and in particular to a vibration transducer based on a high-density coil. Background Technology

[0002] Magnetoelectric vibration transducers are devices that convert vibration into electrical signals. They typically include a vibration sensor to monitor vibration parameters such as velocity, acceleration, and displacement, and a vibration energy harvester. Magnetoelectric transducer structures are generally classified into two types: moving-iron magnet vibration and moving-coil coil vibration. Currently, moving-coil transducer systems are predominantly used, resulting in a relatively large size, and the coils in their transducer structures are mostly macroscopically wound coils. For emerging applications such as wearable devices and industrial wireless sensor networks, miniaturization and high performance of magnetoelectric transducers have become major research and development goals. However, when magnetoelectric transducers are miniaturized, the magnetic field of the magnet becomes weak and its distribution range significantly reduces, while the size of the wound coil becomes too large. When the number of turns is large, most of the coil cannot effectively cut the magnetic field lines.

[0003] Chinese patent application number CN201320168783.5, entitled "Magnetic-Electro-Relative Velocity Sensor," describes a novel sensor with three spring plates, three cavities, and a central push rod. The push rod drives a magnet to vibrate, thus generating an output. This invention employs a moving-coil design with a through-type vibration, but it has fewer coils, resulting in lower magnetic field utilization, and its casing is difficult to manufacture. Chinese patent application number CN201420016715.1, entitled "Vibration Displacement Sensor," describes a sensor with two cavities, employing a moving-coil design, and a magnetic base on the casing. This invention uses a magnetic base on the casing for easy installation and use. It also includes an internal integrating circuit to measure displacement; however, its overall size is relatively large, hindering system miniaturization. Chinese patent application number CN202021407427.0, entitled "A Dual-Channel Magnetoelectric Velocity Sensor," mainly designs a dual-channel magnetoelectric velocity sensor with lead-out terminals at both ends of the device. It employs a moving-iron through-core vibration scheme and adds multiple layers of coils to improve sensitivity. This invention increases usability to some extent, but its large size hinders miniaturization. Chinese patent application number CN201720800508.9, entitled "A Magnetoelectric Vibration Sensor," fixes the coil assembly in a housing, employs a moving-coil through-core vibration scheme, and reduces system friction through a bearing structure. This invention primarily lowers the system's resonant frequency, but its complex internal structure hinders overall system miniaturization. Chinese patent application number CN201410663741.8, entitled "A Magnetoelectric Vibration Sensor," has a structure similar to Chinese patent application number CN201320168783.5. The main improvements are in the magnet housing material and the design of a limiting probe to prevent damage from excessive vibration. However, its magnetic field utilization remains low, hindering further miniaturization. Chinese patent application number CN201320169119.2, entitled "A Magnetoelectric Absolute Velocity Sensor," features a two-cavity structure with a double-spring design and a damping ring. It still employs a moving-coil through-core vibration scheme. This invention is simpler and more reliable, but its overall size is large, preventing further compression of the space. Furthermore, its coil is still a wound coil, which is detrimental to system miniaturization. Chinese patent application number CN201810644638.7, entitled "An Electromagnetic Vibration Energy Harvester Based on a Combined Coil," employs a top-down moving-iron vibration scheme and proposes a novel combined coil. The invention is moving towards miniaturization and integration, but its single-beam structure is not conducive to the lateral stability of the system, and its combined coils require clamps, making it inconvenient to use. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention aims to provide a vibration transducer based on high-density coils, specifically a magnetoelectric vibration transducer based on stacked flexible coils. The stackable planar flexible coils can integrate high-density coils over a short distance, effectively cutting magnetic field lines and offering advantages of high density and small size. Furthermore, the number of coil turns can be increased through multi-layer stacking. Simultaneously, a moving-iron transducer structure is employed, integrating the coils and magnets vertically to improve volume utilization. A double-beam, double-coil structure optimizes the internal structural space of the sensor, reducing the volume of the vibration transducer, improving the mechanical stability of the transducer, and enhancing output sensitivity.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A vibration transducer based on a high-density coil includes a transducer structure support 1 designed as upper and lower parts. The upper part of the transducer structure support 1 is provided with an A-vibration pickup beam 2, and the lower part of the transducer structure support 1 is fixed with a B-vibration pickup beam 3. A permanent magnet 6 is provided between the A-vibration pickup beam 2 and the B-vibration pickup beam 3. An upper stacked flexible coil 4 is provided at the center of the top cover of the transducer structure support 1, and a lower stacked flexible coil 5 is provided at the center of the bottom end of the outer shell base 7 below the B-vibration pickup beam 3. The positive and negative poles of the upper stacked flexible coil 4 and the lower stacked flexible coil 5 are connected to the electrode plates of the line lead terminal 9 in a cascade manner. The lead terminal 9 is fixed at the center of the reserved hole of the outer shell top cover 8. The outer shell top cover 8 and the outer shell base 7 are adapted to each other to form the outer shell of the vibration transducer.

[0007] The upper stacked flexible coil 4 and the lower stacked flexible coil 5 are stackable planar flexible coils, including multiple layers of flexible substrate 11, with coils 10 on the upper and lower surfaces of the flexible substrate 11; metal electrodes 12 are disposed between adjacent flexible substrates 11.

[0008] The coil 10 is a high-density, high-turns coil integrated by hot pressing or electroplating processes.

[0009] Both the A-type vibration-collecting beam 2 and the B-type vibration-collecting beam 3 are planar springs.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. This invention adopts a double-beam and double-coil output design, namely, the A-vibration-picking beam 2 and the B-vibration-picking beam 3, as well as the upper stacked flexible coil 4 and the lower stacked flexible coil 5. The main function of the double beam is to improve the overall mechanical stability of the device and reduce the lateral vibration of the device. The double coil makes full use of the vertical distribution of the magnetic field of the permanent magnet 6, which not only improves the sensitivity of the device, but also changes the magnet-through-the-core structure of the previous magnetoelectric transducer structure, which uses a magnet-coil integrated mode, effectively reducing the overall size of the device.

[0012] 2. This invention is based on a stackable planar flexible coil, which allows the magnet and the coil to be integrated in the vertical direction. This changes the magnet-through-the-core structure of the coil winding in the previous magnetoelectric transducer system, and can significantly reduce the size of the device while improving sensitivity.

[0013] 3. The planar coil in this invention features high density and small volume, and can be stacked in multiple layers as needed. The stacked flexible coil achieves ultra-high coil turn count integration within a short distance around the magnet by stacking planar coils printed on an ultra-thin flexible substrate, thus overcoming the bottleneck of traditional winding coils being too large to cut the weak magnetic field of micro magnets distributed in a small area.

[0014] 4. This device can be used as a vibration sensor to detect physical quantities such as vibration displacement, velocity, and acceleration without the need for a power supply; it can also be used as a vibration energy harvester to collect vibration energy. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure in this invention.

[0016] Figure 2 This is a schematic diagram of the structure of a single flexible coil in a stacked flexible coil system.

[0017] Figure 3 This is a schematic diagram of the stacked structure of the multilayer flexible coil. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings.

[0019] Reference Figure 1A vibration transducer based on high-density coils includes a transducer structure support 1 designed as upper and lower parts. The upper part of the transducer structure support 1 is equipped with an A-type vibration pickup beam 2, which can be fixed in the transducer structure support 1 by screws, riveting, bonding, or direct compression. The transducer structure support 1 mainly provides support points for the A-type and B-type vibration pickup beams 2 and 3. The lower part of the transducer structure support 1 fixes the B-type vibration pickup beam 3. A permanent magnet 6 is arranged between the A-type and B-type vibration pickup beams 2 and 3. The A-type and B-type vibration pickup beams 2 and 3 are planar springs, which both support the permanent magnet 6 (specifically fixed to the permanent magnet 6 by bonding or riveting) and act as springs in the vibration environment. In the vibration transducer structure, the permanent magnet 6 mainly provides the magnetic field for coils 4 and 5. It also acts as a mass to adjust the system's resonant frequency. An upper layered flexible coil 4 is provided at the center of the top cover of the transducer structure support 1, and a lower layered flexible coil 5 is provided at the center of the bottom end of the outer shell base 7 below the B vibration pickup beam 3. The upper layered flexible coil 4 and the lower layered flexible coil 5 are high-density, small-volume coils. For specific implementation, see 2. They are fixed at the center of the top cover of the transducer structure support 1 and the center of the bottom end of the outer shell base 7 respectively by means of adhesive bonding, screws, etc. Their main function is that in the vibration environment, as the permanent magnet 6 vibrates, the layered flexible coils 4 and 5 cut the magnetic field lines and generate an induced electromotive force.

[0020] The positive and negative leads of the upper stacked flexible coil 4 and the lower stacked flexible coil 5 are cascaded and welded to the electrode plates of the line lead terminal 9. When fixing the upper stacked flexible coil 4 and the lower stacked flexible coil 5, the positive and negative leads of the coils need to be pre-reserved, and the positive and negative leads of the upper and lower coils are cascaded and welded to the electrode plates of the line lead terminal 9. A lead groove is designed on the side wall of the housing base 7 to facilitate the lead-out of the coil leads. The lead terminal 9 is fixed at the pre-reserved hole in the center of the housing top cover 8. The lead terminal 9 has two electrodes, which are respectively connected to the positive and negative leads of the coil. This lead terminal can be connected and output via cables or other means. The housing top cover 8 and the housing base 7 are fitted together to form the housing of the vibration transducer, and the two can be fixed by threads, screws, or adhesive. A threaded hole is provided in the center of the bottom of the housing base 7 for easy fixing to the equipment to be measured.

[0021] The upper stacked flexible coil 4 and the lower stacked flexible coil 5 are stackable planar flexible coils, which have advantages such as high density, small size, and the ability to be stacked. Specifically, as shown... Figure 2As shown, the flexible substrate 11, comprising multiple layers, possesses advantages such as ultra-thinness and flexibility. The upper and lower surfaces of the flexible substrate 11 are formed by high-density, high-turn coils 10 integrated through hot pressing or electroplating processes. Metal electrodes 12 are disposed between adjacent flexible substrates 11, primarily serving to provide circuit pathways and mechanical connections between the stacked coils. The substrate 11, coils 10, and metal electrodes 12 of the planar flexible coil can have any desired shape, such as rectangular, circular, or rhomboid. Figure 3 As shown, the required number of planar flexible coils are stacked, aligned, and then multilayered flexible coils are achieved through bonding or adhesive bonding processes. Fixing holes can also be provided on the planar flexible coils to facilitate coil fixation.

[0022] The working principle of this invention is as follows: When the invention is placed in a vibrating environment, the permanent magnet 6 vibrates. Under the action of vibration-collecting beams A and B, the permanent magnet 6 vibrates in the up-down direction as shown in the figure. During the vibration, the magnetic field generated by the permanent magnet 6 cuts the upper and lower flexible coils 4 and 5. According to the principle of electromagnetic law, induced electromotive forces are generated on the upper and lower flexible coils 4 and 5 respectively. The output voltages of the upper and lower flexible coils 4 and 5 are then connected in series through a cascade method. A lead wire groove is designed on the side wall of the outer casing base 7 to connect the electrode lead of the lower flexible coil 5 to one end of the lead terminal 9, and the electrode lead terminal of the upper flexible coil 4 to the other end of the lead terminal 9. By measuring the voltage between the two electrodes of the lead terminal 9, the vibration energy in the environment can be converted into electrical energy.

[0023] The upper and lower stacked flexible coils 4 and 5 are formed by stacking planar flexible coils. The planar flexible coils have an ultra-thin, bendable flexible substrate 11; the upper and lower surfaces of the flexible substrate 11 are high-density, high-turn coils 10 integrated through hot pressing or electroplating processes; metal electrodes 12 are disposed between adjacent flexible substrates 11; and fixing holes can be provided on the planar flexible coils to facilitate coil fixation. During the fabrication of the stacked flexible coils, the required number of planar flexible coils are stacked, aligned, and then multi-layered flexible coils are achieved through bonding or adhesive bonding processes.

Claims

1. A vibration transducer based on a high-density coil, characterized in that, The device includes a transducer structure support (1) designed as an upper and lower part. The upper part of the transducer structure support (1) is provided with an A-vibration pickup beam (2), and the lower part of the transducer structure support (1) is fixed with a B-vibration pickup beam (3). A permanent magnet (6) is provided between the A-vibration pickup beam (2) and the B-vibration pickup beam (3). An upper stacked flexible coil (4) is provided at the center of the top cover of the transducer structure support (1), and a lower stacked flexible coil (5) is provided at the center of the bottom end of the outer shell base (7) below the B-vibration pickup beam (3). The positive and negative poles of the upper stacked flexible coil (4) and the lower stacked flexible coil (5) are connected to the electrode plates of the line lead-out terminal (9) in a cascade manner. The lead-out terminal (9) is fixed at the center reserved hole of the outer shell top cover (8). The outer shell top cover (8) and the outer shell base (7) are adapted to each other to form the outer shell of the vibration transducer device. The upper stacked flexible coil (4) and the lower stacked flexible coil (5) are stackable planar flexible coils, including multiple layers of flexible substrate (11), with coils (10) on the upper and lower surfaces of the flexible substrate (11); metal electrodes (12) are disposed between adjacent flexible substrates (11); The coil (10) is a high-density, high-turns coil integrated by hot pressing or electroplating processes; The A-pickup beam (2) and B-pickup beam (3) are planar springs.

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