Design scheme of symmetric periodic permanent magnet electromagnetic ultrasonic transducer

Abstract

The invention relates to the technical field of electromagnetic ultrasonic transduction, and discloses a design scheme of a symmetric periodic permanent magnet electromagnetic ultrasonic transducer, which comprises symmetric periodic permanent magnet structure design, coil design and optimization, waveform control and optimization and overall structure design. The symmetric periodic permanent magnet structure design comprises a design concept, a specific structure and a mathematical model, the design concept is based on the inspiration of a Halbach array, a similar focusing type permanent magnet unit is designed, and a magnetic field generated by a permanent magnet forms high-strength and high-uniformity magnetic field distribution in a coil area through a specific magnetization direction and an arrangement mode. According to the design scheme of the symmetric periodic permanent magnet electromagnetic ultrasonic transducer, the symmetric periodic permanent magnet structure design is adopted, so that the magnetic field distribution is effectively optimized, the magnetic field intensity of a coil area is remarkably improved, the distribution is more uniform, and the energy conversion efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic ultrasonic transducer, in particular to a design scheme of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer. Background Art

[0002] An electromagnetic ultrasonic transducer is a device that uses electromagnetic effects to excite ultrasonic waves in materials. Common devices are used in non-destructive testing, material property evaluation and other fields.

[0003] These devices generate ultrasonic waves through the interaction of electromagnetic fields with the magnetostrictive effect in materials. However, traditional electromagnetic ultrasonic transducers have disadvantages such as low energy conversion efficiency, uneven magnetic field distribution, and complex and difficult to control excited ultrasonic modes.

[0004] Specifically, traditional electromagnetic ultrasonic transducers usually use non-periodic permanent magnet structures, which leads to uneven magnetic field distribution, affecting the excitation efficiency and propagation direction of ultrasonic waves. In addition, due to the suboptimal design of magnetic field and current waveforms, the excited ultrasonic modes often contain multiple modes, making signal analysis complicated and inaccurate. At the same time, the heat problem generated by long-term operation is also a challenge faced by traditional electromagnetic ultrasonic transducers, affecting the stability and reliability of the system. Therefore, a design scheme of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer is proposed to solve the above-mentioned problems. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the shortcomings of the prior art, the present invention provides a design scheme for a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer, which has the advantages of high energy conversion efficiency, uniform magnetic field distribution, and controllable ultrasonic mode. It solves the problems of low energy conversion efficiency, uneven magnetic field and complex excitation mode of traditional electromagnetic ultrasonic transducers.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A design scheme for a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer includes symmetrical periodic permanent magnet structure design, coil design and optimization, waveform control and optimization, and overall structure design.

[0010] As a preferred technical solution of the present invention, the symmetrical periodic permanent magnet structure design includes a design concept, a specific structure and a mathematical model. The design concept is inspired by the Halbach array and designs a focusing-type permanent magnet unit. Through a specific magnetization direction and arrangement, the magnetic field generated by the permanent magnet forms a high-intensity, high-uniformity magnetic field distribution in the coil area.

[0011] As a preferred technical solution of the present invention, the specific structure is that the permanent magnet units are arranged symmetrically, that is, the magnetization directions of adjacent permanent magnets are opposite, forming a periodic magnetic field structure. The mathematical model assumes that the magnetization intensity of each permanent magnet unit is M, the magnet spacing is d, the coil radius is r, and the number of coil turns is N. Then, according to the electromagnetic principle, the magnetic field intensity H in the coil area can be approximately expressed as:

[0012]

[0013] Where I is the current intensity in the coil. By optimizing parameters such as the magnet spacing d and the coil radius r, the magnetic field intensity H can be further improved, thereby achieving more efficient ultrasonic excitation.

[0014] As a preferred technical solution of the present invention, the coil design and optimization includes coil structure, material selection and optimization method. The coil in the coil structure is wound with multiple turns to increase the current density and magnetic field strength. At the same time, the geometric shape and size of the coil should match the permanent magnet structure to ensure effective coupling of the magnetic field.

[0015] As a preferred technical solution of the present invention, the material is selected to have good conductivity and heat resistance so as to withstand the heat generated by high current density and long-term operation. The optimization method optimizes the coil's geometry, number of turns, current density and other parameters through simulation tools such as finite element analysis (FEA) to achieve optimal magnetic field distribution and energy conversion efficiency.

[0016] As a preferred technical solution of the present invention, the waveform control and optimization includes mode selection, dispersion control and mathematical model and simulation. The mode selection can control the excited ultrasonic mode by adjusting parameters such as the arrangement of the permanent magnets, the geometry of the coils and the current waveform.

[0017] As a preferred technical solution of the present invention, the dispersion control has dispersion characteristics through Lamb waves, that is, waves of different frequencies have different speeds and attenuation characteristics during propagation. By optimizing the design parameters of the permanent magnet and the coil, the dispersion effect can be reduced and the propagation distance and signal quality of the ultrasonic wave can be improved. The mathematical model and simulation use mathematical tools such as wave equations and finite element analysis to simulate and analyze the propagation process of the ultrasonic wave to optimize the design parameters of the permanent magnet and the coil.

[0018] As a preferred technical solution of the present invention, the overall structural design includes modular design, heat dissipation design, and packaging and protection. The modular design facilitates assembly and maintenance by designing the permanent magnet unit, coil and other key components into a modular structure. At the same time, the modular design can also improve the flexibility and scalability of the system.

[0019] As a preferred technical solution of the present invention, the heat dissipation design takes into account the heat generated by long-term operation, and adopts heat dissipation elements such as heat sinks and fans to ensure the stable operation of the system. The packaging and protection adopts shell materials with high waterproof and dustproof levels to improve the durability and reliability of the system.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the present invention provides a design scheme of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer, which has the following beneficial effects:

[0022] The design of the symmetrical periodic permanent magnet electromagnetic ultrasonic transducer effectively optimizes the magnetic field distribution by adopting a symmetrical periodic permanent magnet structure design, so that the magnetic field strength in the coil area is significantly improved and the distribution is more uniform, thereby greatly improving the energy conversion efficiency; at the same time, the design further enhances the matching degree between the current density and the magnetic field strength by carefully selecting and optimizing the coil structure, materials and parameters, thereby ensuring the effective coupling of the magnetic field; more importantly, through waveform control and optimization means such as mode selection and dispersion control, the present invention successfully realizes the precise regulation of the excited ultrasonic mode, effectively avoiding the signal analysis difficulties caused by the complex modes in traditional transducers; in addition, innovative measures such as modularization, heat dissipation, packaging and protection in the overall structural design not only improve the flexibility and scalability of the system, but also ensure the reliability and durability under long-term stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] See also Figure 1 A design scheme for a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer includes symmetrical periodic permanent magnet structure design, coil design and optimization, waveform control and optimization, and overall structure design.

[0028] In this embodiment, the design of the symmetrical periodic permanent magnet structure includes a design concept, a specific structure and a mathematical model. The design concept is inspired by the Halbach array and designs a focusing-type permanent magnet unit. Through a specific magnetization direction and arrangement, the magnetic field generated by the permanent magnet forms a high-intensity, high-uniformity magnetic field distribution in the coil area.

[0029] In this embodiment, the specific structure is that the permanent magnet units are arranged symmetrically, that is, the magnetization directions of adjacent permanent magnets are opposite, forming a periodic magnetic field structure. This arrangement not only enhances the magnetic field strength in the coil area, but also reduces magnetic field leakage and improves energy conversion efficiency. The mathematical model assumes that the magnetization strength of each permanent magnet unit is M, the magnet spacing is d, the coil radius is r, and the number of coil turns is N. According to the electromagnetic principle, the magnetic field strength H in the coil area can be approximately expressed as:

[0030]

[0031] Where I is the current intensity in the coil. By optimizing parameters such as the magnet spacing d and the coil radius r, the magnetic field intensity H can be further improved, thereby achieving more efficient ultrasonic excitation.

[0032] In this embodiment, the coil design and optimization include coil structure, material selection and optimization method. The coil in the coil structure is wound with multiple turns to increase the current density and magnetic field strength. At the same time, the geometric shape and size of the coil should match the permanent magnet structure to ensure effective coupling of the magnetic field.

[0033] In this embodiment, the material is selected by selecting materials with good conductivity and heat resistance to withstand the heat generated by high current density and long-term operation. The optimization method optimizes the coil's geometry, number of turns, current density and other parameters through simulation tools such as finite element analysis (FEA) to achieve optimal magnetic field distribution and energy conversion efficiency.

[0034] In this embodiment, waveform control and optimization include mode selection, dispersion control, and mathematical model and simulation. Mode selection can control the excited ultrasonic mode by adjusting parameters such as the arrangement of permanent magnets, the geometry of the coil, and the current waveform, aiming to eliminate the A0 mode and increase the displacement amplitude of the S0 mode.

[0035] In this embodiment, dispersion control is achieved through the dispersion characteristics of Lamb waves, that is, waves of different frequencies have different speeds and attenuation characteristics during propagation. By optimizing the design parameters of the permanent magnet and the coil, the dispersion effect can be reduced and the propagation distance and signal quality of the ultrasonic wave can be improved. The mathematical model and simulation use mathematical tools such as wave equations and finite element analysis to simulate and analyze the propagation process of the ultrasonic wave to optimize the design parameters of the permanent magnet and the coil.

[0036] In this embodiment, the overall structural design includes modular design, heat dissipation design, and packaging and protection. The modular design facilitates assembly and maintenance by designing the permanent magnet unit, coil and other key components into a modular structure. At the same time, the modular design can also improve the flexibility and scalability of the system.

[0037] In this embodiment, the heat dissipation design takes into account the heat generated by long-term operation, and adopts heat dissipation elements such as heat sinks and fans to ensure the stable operation of the system. The packaging and protection adopts shell materials with high waterproof and dustproof levels to improve the durability and reliability of the system.

[0038] Beneficial effects:

[0039] The design of the symmetrical periodic permanent magnet electromagnetic ultrasonic transducer effectively optimizes the magnetic field distribution by adopting a symmetrical periodic permanent magnet structure design, so that the magnetic field strength in the coil area is significantly improved and the distribution is more uniform, thereby greatly improving the energy conversion efficiency; at the same time, the design further enhances the matching degree between the current density and the magnetic field strength by carefully selecting and optimizing the coil structure, materials and parameters, thereby ensuring the effective coupling of the magnetic field; more importantly, through waveform control and optimization means such as mode selection and dispersion control, the present invention successfully realizes the precise regulation of the excited ultrasonic mode, effectively avoiding the signal analysis difficulties caused by the complex modes in traditional transducers; in addition, innovative measures such as modularization, heat dissipation, packaging and protection in the overall structural design not only improve the flexibility and scalability of the system, but also ensure the reliability and durability under long-term stable operation.

[0040] Working principle:

[0041] By designing symmetrically arranged permanent magnet units, each unit has a specific magnetization direction and arrangement, so as to form a high-intensity and highly uniform magnetic field in the coil area. When an alternating current passes through the coil, according to Faraday's law of electromagnetic induction, the changing magnetic field will induce eddy currents in the material, and the eddy currents interact with the static magnetic field generated by the permanent magnets, and ultrasonic waves are excited in the material through the magnetostrictive effect. In addition, by finely adjusting parameters such as the arrangement of the permanent magnets, the geometric shape of the coils and the current waveform, the present invention can achieve precise control of the excited ultrasonic mode, effectively suppress unnecessary modes (such as the A0 mode), and enhance the displacement amplitude of the required mode (such as the S0 mode). Finally, these ultrasonic waves propagate in the material and are used for applications such as non-destructive testing and material property evaluation. The modularization, heat dissipation and packaging protection measures considered in the overall structural design ensure the stability and reliability of the transducer during long-term operation.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A design scheme of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer, characterized in that: It includes symmetrical periodic permanent magnet structure design, coil design and optimization, waveform control and optimization, and overall structure design.

2. The design of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer according to claim 1 is characterized in that: The symmetrical periodic permanent magnet structure design includes a design concept, a specific structure and a mathematical model. The design concept is inspired by the Halbach array and designs a focusing-type permanent magnet unit. Through a specific magnetization direction and arrangement, the magnetic field generated by the permanent magnet forms a high-intensity, high-uniformity magnetic field distribution in the coil area.

3. The design of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer according to claim 2 is characterized in that: The specific structure is that the permanent magnet units are arranged symmetrically, that is, the magnetization directions of adjacent permanent magnets are opposite, forming a periodic magnetic field structure. The mathematical model assumes that the magnetization intensity of each permanent magnet unit is M, the magnet spacing is d, the coil radius is r, and the number of coil turns is N. According to the electromagnetic principle, the magnetic field intensity H in the coil area can be approximately expressed as: Where I is the current intensity in the coil. By optimizing parameters such as the magnet spacing d and the coil radius r, the magnetic field intensity H can be further improved, thereby achieving more efficient ultrasonic excitation.

4. The design of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer according to claim 1 is characterized in that: The coil design and optimization include coil structure, material selection and optimization method. In the coil structure, the coil is wound with multiple turns to increase the current density and magnetic field strength. At the same time, the geometric shape and size of the coil should match the permanent magnet structure to ensure effective coupling of the magnetic field.

5. The design of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer according to claim 4 is characterized in that: The material selection is to select materials with good electrical conductivity and heat resistance to withstand the heat generated by high current density and long-term operation. The optimization method optimizes the coil's geometry, number of turns, current density and other parameters through simulation tools such as finite element analysis (FEA) to achieve optimal magnetic field distribution and energy conversion efficiency.

6. The design of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer according to claim 1 is characterized in that: The waveform control and optimization include mode selection, dispersion control and mathematical model and simulation. The mode selection can control the excited ultrasonic mode by adjusting parameters such as the arrangement of permanent magnets, the geometry of the coil and the current waveform.

7. The design of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer according to claim 6 is characterized in that: The dispersion control is achieved through the dispersion characteristics of Lamb waves, that is, waves of different frequencies have different speeds and attenuation characteristics during propagation. By optimizing the design parameters of the permanent magnet and the coil, the dispersion effect can be reduced and the propagation distance and signal quality of the ultrasonic wave can be improved. The mathematical model and simulation use mathematical tools such as wave equations and finite element analysis to simulate and analyze the propagation process of the ultrasonic wave to optimize the design parameters of the permanent magnet and the coil.

8. The design of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer according to claim 1 is characterized in that: The overall structural design includes modular design, heat dissipation design, and packaging and protection. The modular design facilitates assembly and maintenance by designing the permanent magnet unit, coil and other key components into a modular structure. At the same time, the modular design can also improve the flexibility and scalability of the system.

9. The design of a symmetrical periodic permanent magnet electromagnetic ultrasonic transducer according to claim 1, characterized in that: The heat dissipation design takes into account the heat generated by long-term operation, and adopts heat dissipation elements such as heat sinks and fans to ensure the stable operation of the system. The packaging and protection adopts shell materials with high waterproof and dustproof levels to improve the durability and reliability of the system.

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