Array electromagnetic excitation system and method for adaptively adjusting spatial magnetic field intensity

Abstract

The invention relates to the technical field of electromagnetic excitation, discloses an array electromagnetic excitation system capable of adaptively adjusting spatial magnetic field intensity, and aims to solve the problems of non-uniform field distribution, inflexible parameter regulation and control and weak scene adaptability of a traditional electromagnetic excitation system. According to the system, a technical system of'multi-parameter independent regulation and control-adaptive power matching-reconfigurable array collaborative optimization 'is constructed, a distributed intelligent control architecture of'DDS + FPGA + AI algorithms' is adopted, and independent adjustment of electromagnetic parameters of an excitation source is realized in combination with a frequency-band power amplification and dynamic impedance matching technology; a reconfigurable coil array driven by piezoelectricity is matched with a multi-physical field monitoring closed loop of a Hall sensor array and a temperature / stress sensor, and the distribution uniformity of an electromagnetic field is adjusted in combination with a field-structure collaborative optimization algorithm. According to the invention, the energy transmission efficiency and scene adaptability can be improved, and high-precision adjustment of electromagnetic excitation is realized.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic excitation technology, and in particular to an array electromagnetic excitation system and method for adaptively adjusting the intensity of a spatial magnetic field. Background Technology

[0002] In the field of electromagnetic excitation applications, traditional electromagnetic excitation devices have many limitations and cannot meet the requirements of high precision and multi-scenario applications. The specific problems are as follows:

[0003] Insufficient field distribution accuracy: A single excitation source or fixed array is unlikely to form a uniform or specific electromagnetic field. The electromagnetic field strength decreases exponentially with distance, and the field strength distribution gradient within the effective area is large. This leads to uneven material processing and cannot meet the excitation requirements of complex-shaped objects (such as heat treatment of irregularly shaped workpieces or specific areas). For example, in the heat treatment of irregularly shaped turbine blades of engines, traditional devices cannot ensure that different areas of the blade are heated uniformly, affecting the quality of heat treatment.

[0004] Low parameter adjustment flexibility: The parameters of the excitation unit in the fixed array structure cannot be adjusted independently, and the field distribution uniformity cannot be dynamically optimized according to load changes or target area morphology. When the application scenario changes, the device needs to be disassembled and reassembled to adjust the parameters, which is cumbersome and time-consuming, reduces work efficiency, and limits the rapid application of electromagnetic excitation technology in multiple scenarios.

[0005] In view of the shortcomings of the above-mentioned traditional technologies, the present invention designs an integrated and intelligent array electromagnetic excitation system that can adaptively adjust the spatial magnetic field strength according to the application scenario requirements and dynamically adapt to various scenarios to solve the problems existing in the traditional technologies. Summary of the Invention

[0006] Therefore, the purpose of this invention is to provide an array electromagnetic excitation system and method for adaptively adjusting the spatial magnetic field strength, which can adaptively adjust the spatial magnetic field strength according to the application scenario requirements and dynamically adapt to various scenarios, so as to solve the problems pointed out in the background art above.

[0007] To achieve the aforementioned objectives, the technical solution adopted is as follows:

[0008] An array electromagnetic excitation system that adaptively adjusts the intensity of a spatial magnetic field includes:

[0009] It includes an excitation source module, an adaptive power amplification link, a reconfigurable coil array, a control and feedback module, and a multi-physics field detection module. These modules work together to build a closed-loop control system of "sensing-decision-execution-feedback".

[0010] The excitation source module adopts a "DDS chip + FPGA main control" architecture, equipped with a ROM memory and a PLL clock signal module. The ROM memory is used to read waveform data in parallel and supports multiple waveform outputs such as sine wave and square wave. The PLL clock signal module, combined with the dual-chip serial structure, realizes dynamic control of frequency, phase and duty cycle of 8-32 independent channels. The output signal of each channel is connected to the adaptive power amplifier link after being converted by a 16-bit D / A converter.

[0011] The adaptive power amplifier link is based on a frequency band design. Linear amplifiers are used in the low frequency band below 1MHz and radio frequency amplifiers are used in the high frequency band above 1MHz. It is combined with a Class E switch topology and an adjustable impedance matching network that monitors the input impedance in real time. The inductor / capacitor parameters are dynamically adjusted through an intelligent matching algorithm.

[0012] The reconfigurable coil array achieves switching of the array's electromagnetic coil shape and structure via a piezoelectric drive bracket, supporting linear, rectangular, circular, and three-dimensional array shape conversions, with element spacing within... The range is continuously adjustable, and the optimization model based on the mutual inductance coefficient automatically avoids the grid lobes, with permalloy shielding layers added to adjacent units;

[0013] The control and feedback module is based on "FPGA+DSP+AI algorithm". It establishes a mathematical model of electromagnetic field distribution according to the application scenario, combines the field distribution data fed back in real time by the multi-physics field detection module, calculates the optimal excitation parameters of each excitation source channel through the DSP running model predictive control algorithm, and sends control commands to the excitation source module and the reconfigurable coil array.

[0014] The multiphysics detection module uses an array of Hall sensors and temperature / stress sensors to collect electromagnetic field distribution, power loss and environmental parameters in real time. The data is transmitted to the control and feedback module via a high-speed ADC.

[0015] As a further improvement of the present invention, the intelligent matching algorithm is used to dynamically adjust the inductance / capacitance parameters of the adjustable impedance matching network, so that the power transmission efficiency is stabilized at a high level, and the reconfigurable coil array is driven to generate an electromagnetic field of sufficient strength.

[0016] As a further improvement of the present invention, the AI ​​algorithm includes a genetic algorithm. When the field distribution data collected by the multi-physics detection module deviates from the target by more than 5%, the excitation parameters and the structure of the reconfigurable coil array are optimized by the genetic algorithm until the field distribution uniformity error is less than 5%.

[0017] An adaptive adjustment method based on the array electromagnetic excitation system described above includes the following steps:

[0018] S1: After the scene recognition module inputs the target field distribution parameters, the central control module calls preset models such as uniform field and focused field to calculate the initial configuration. According to the Biot-Savart law, it calculates the magnetic field generated by an electromagnetic coil with current flowing through it at any point on the axis. Due to the symmetry of the coil, the magnetic field generated by all current elements at P will cancel each other out in the components perpendicular to the axis, and only the components along the axis will be superimposed. Let the angle between dB and the axis be θ, then the magnetic field components along the axis... Combining geometric relationships, we can obtain:

[0019] ;

[0020] in, This represents the vector pointing from the current element to that point. This is the distance from the current element to that point. Refers to current element, is the magnetic permeability in vacuum;

[0021] The magnetic field generated at any point in space by an array of electromagnetic coils is proportional to the current in the conductor, that is: ,in, It is the integral of the Biot-Savart linear coefficient of current over the current path, and its calculation formula is: ;

[0022] The electromagnetic field generated by electric current follows the principle of vector superposition. In an environment with multiple current sources, the magnetic field at a point in space is formed by the vector superposition of multiple sources.

[0023] ;

[0024] In the formula, Indicates the number of field sources. These represent the magnitudes of the currents from each field source. It is the component of the magnetic field strength at that point in three-dimensional space. These represent the points in three-dimensional space, respectively. The three-dimensional components of the magnetic field generated by each coil;

[0025] S2: Based on the calculation results, the array reconstruction module adjusts the cell position and shape, and the multi-parameter control module configures the excitation signal parameters;

[0026] S3: The field distribution monitoring module collects data in real time. If the deviation from the target is >5%, the excitation parameters and array structure are optimized through a genetic algorithm until the field distribution uniformity error is ≤5%.

[0027] The beneficial effects of this invention are:

[0028] 1. Adaptable to multiple scenarios: The piezoelectrically driven telescopic bracket supports switching between various array forms such as linear, rectangular, circular, and three-dimensional arrays. Combined with the mutual inductance coefficient optimization model, it automatically avoids grid lobes and can adapt to target objects of different shapes and application scenarios. The intelligent array reconstruction combined with AI algorithms can automatically adjust system parameters according to scenario requirements, eliminating the need for frequent manual disassembly and adjustment of the device, greatly improving scenario adaptability and making it suitable for multiple fields such as material heat treatment and biomedical stimulation.

[0029] 2. High control precision: Through "DDS+ multi-channel collaborative design", sub-micro level control of frequency, phase and amplitude is achieved to ensure the signal accuracy of each excitation channel; the element spacing of the reconfigurable coil array is continuously adjustable and a shielding layer is added to reduce crosstalk; the multi-physics field detection module collects data in real time and forms a closed-loop feedback to further optimize the electromagnetic field distribution, improve the uniformity of field distribution, and meet the high-precision excitation requirements (such as precise stimulation of specific areas in the biomedical field).

[0030] 3. Excellent energy efficiency: The adaptive power amplifier link is based on a frequency band design, selecting appropriate amplifiers for different frequency bands to ensure signal amplification efficiency; combined with an intelligent matching algorithm, it dynamically adjusts the parameters of the adjustable impedance matching network to reduce energy loss, keep the power transmission efficiency at a high level, reduce system energy consumption, improve energy utilization, and conform to the development trend of energy conservation and environmental protection. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a structural diagram of the reconfigurable array coil unit of the present invention;

[0033] Figure 2 This is a flowchart illustrating the interaction relationships between the system modules of the present invention.

[0034] Figure 3 This is a schematic diagram illustrating the adaptive adjustment of the spatial field distribution according to the present invention. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0037] like Figure 1-3 As shown, the array electromagnetic excitation system for adaptively adjusting the spatial magnetic field strength includes:

[0038] It includes an excitation source module, an adaptive power amplification link, a reconfigurable coil array, a control and feedback module, and a multi-physics field detection module. These modules work together to build a closed-loop control system of "sensing-decision-execution-feedback".

[0039] The excitation source module adopts a "DDS chip + FPGA main control" architecture, equipped with a ROM memory and a PLL clock signal module. The ROM memory is used to read waveform data in parallel and supports multiple waveform outputs such as sine wave and square wave. The PLL clock signal module, combined with the dual-chip serial structure, realizes dynamic control of frequency, phase and duty cycle of 8-32 independent channels. The output signal of each channel is connected to the adaptive power amplifier link after being converted by a 16-bit D / A converter.

[0040] The adaptive power amplifier link is based on a frequency band design. Linear amplifiers are used in the low frequency band below 1MHz and radio frequency amplifiers are used in the high frequency band above 1MHz. It is combined with a Class E switch topology and an adjustable impedance matching network that monitors the input impedance in real time. The inductor / capacitor parameters are dynamically adjusted through an intelligent matching algorithm.

[0041] The reconfigurable coil array achieves switching of the array's electromagnetic coil shape and structure via a piezoelectric drive bracket, supporting linear, rectangular, circular, and three-dimensional array shape conversions, with element spacing within... The range is continuously adjustable, and the optimization model based on the mutual inductance coefficient automatically avoids the grid lobes, with permalloy shielding layers added to adjacent units;

[0042] The control and feedback module is based on "FPGA+DSP+AI algorithm". It establishes a mathematical model of electromagnetic field distribution according to the application scenario, combines the field distribution data fed back in real time by the multi-physics field detection module, calculates the optimal excitation parameters of each excitation source channel through the DSP running model predictive control algorithm, and sends control commands to the excitation source module and the reconfigurable coil array.

[0043] The multiphysics detection module uses an array of Hall sensors and temperature / stress sensors to collect electromagnetic field distribution, power loss and environmental parameters in real time. The data is transmitted to the control and feedback module via a high-speed ADC.

[0044] The intelligent matching algorithm is used to dynamically adjust the inductance / capacitance parameters of the adjustable impedance matching network, so that the power transmission efficiency is stabilized at a high level, and the reconfigurable coil array is driven to generate an electromagnetic field of sufficient strength.

[0045] The AI ​​algorithm includes a genetic algorithm. When the field distribution data collected by the multiphysics detection module deviates from the target by more than 5%, the excitation parameters and the structure of the reconfigurable coil array are optimized by the genetic algorithm until the field distribution uniformity error is less than or equal to 5%.

[0046] An adaptive adjustment method based on the array electromagnetic excitation system described above includes the following steps:

[0047] S1: After the scene recognition module inputs the target field distribution parameters, the central control module calls preset models such as uniform field and focused field to calculate the initial configuration. According to the Biot-Savart law, it calculates the magnetic field generated by an electromagnetic coil with current flowing through it at any point on the axis. Due to the symmetry of the coil, the magnetic field generated by all current elements at P will cancel each other out in the components perpendicular to the axis, and only the components along the axis will be superimposed. Let the angle between dB and the axis be θ, then the magnetic field components along the axis... Combining geometric relationships, we can obtain:

[0048] ;

[0049] in, This represents the vector pointing from the current element to that point. This is the distance from the current element to that point. Refers to current element, is the magnetic permeability in vacuum;

[0050] The magnetic field generated at any point in space by an array of electromagnetic coils is proportional to the current in the conductor, that is: ,in, It is the integral of the Biot-Savart linear coefficient of current over the current path, and its calculation formula is: ;

[0051] The electromagnetic field generated by electric current follows the principle of vector superposition. In an environment with multiple current sources, the magnetic field at a point in space is formed by the vector superposition of multiple sources.

[0052] ;

[0053] In the formula, Indicates the number of field sources. These represent the magnitudes of the currents from each field source. It is the component of the magnetic field strength at that point in three-dimensional space. These represent the points in three-dimensional space, respectively. The three-dimensional components of the magnetic field generated by each coil;

[0054] S2: Based on the calculation results, the array reconstruction module adjusts the cell position and shape, and the multi-parameter control module configures the excitation signal parameters;

[0055] S3: The field distribution monitoring module collects data in real time. If the deviation from the target is >5%, the excitation parameters and array structure are optimized through a genetic algorithm until the field distribution uniformity error is ≤5%.

[0056] Taking the heat treatment of irregularly shaped workpieces, such as the irregularly shaped turbine blades of an engine, as an example, the system is assembled according to the above technical solution, integrating the excitation source module, reconfigurable coil array, control module, and multi-physics field monitoring module: The excitation source module adopts a "DDS chip + FPGA main control" architecture, expanding 8-32 independent channels, pre-storing the sine wave and square wave waveform data required for heat treatment, and each channel signal is connected to the power amplification link after 16-bit D / A conversion; the adaptive power amplification link selects a linear amplifier in combination with a Class E switching topology and an adjustable impedance matching network for the low and medium frequency bands commonly used in heat treatment; the reconfigurable coil array is assembled through a piezoelectric drive bracket, supporting the switching of linear, three-dimensional, and other array forms to adapt to the irregular blade structure, with the array element spacing in... Range adjustment, adjacent units are equipped with permalloy shielding layer; the control module is loaded with "FPGA+DSP+AI algorithm", and a mathematical model of electromagnetic field distribution based on Biot-Savart law is pre-stored. The multi-physics field monitoring module deploys array-type Hall sensors and temperature sensors, which are aligned with the heat treatment area of ​​the workpiece.

[0057] During the system debugging phase, the excitation source module is first calibrated to ensure accurate output of frequency, phase, and duty cycle for each channel; then electromagnetic compatibility testing is conducted, and the spacing between coil elements and shielding measures are adjusted to reduce crosstalk between units; finally, joint debugging is performed, initial excitation parameters are set, and field distribution data is verified through the monitoring module.

[0058] During the formal heat treatment, the scene recognition module inputs the target field distribution parameters of the irregular turbine blade. The central control module calls the preset uniform field model and calculates the initial configuration based on the Biot-Savart law and the magnetic field vector superposition formula. This drives the piezoelectric support to reconstruct the coil array into a shape that conforms to the blade's contour. The multi-parameter control module configures the excitation signal frequency and phase. Subsequently, the system is started, and the field distribution monitoring module collects magnetic field and temperature data in real time. If the detected magnetic field distribution deviates significantly from the target, the excitation parameters and array structure are optimized through a genetic algorithm. This iterative optimization continues until the magnetic field distribution uniformity error reaches the expected level, maintaining stable excitation to complete the heat treatment process. Closed-loop feedback throughout the process ensures uniform heating of the workpiece to meet process requirements.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, component splitting or combination, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An array electromagnetic excitation system for adaptively adjusting the intensity of a spatial magnetic field, characterized in that, include: It includes an excitation source module, an adaptive power amplifier link, a reconfigurable coil array, a control and feedback module, and a multi-physics field detection module. These modules work together to build a closed-loop control system of "sensing-decision-execution-feedback". The excitation source module adopts a "DDS chip + FPGA main control" architecture, equipped with a ROM memory and a PLL clock signal module. The ROM memory is used to read waveform data in parallel and supports multiple waveform outputs such as sine wave and square wave. The PLL clock signal module, combined with the dual-chip serial structure, realizes dynamic control of frequency, phase and duty cycle of 8-32 independent channels. The output signal of each channel is connected to the adaptive power amplifier link after being converted by a 16-bit D / A converter. The adaptive power amplifier link is based on a frequency band design. Linear amplifiers are used in the low frequency band below 1MHz and radio frequency amplifiers are used in the high frequency band above 1MHz. It is combined with a Class E switch topology and an adjustable impedance matching network that monitors the input impedance in real time. The inductor / capacitor parameters are dynamically adjusted through an intelligent matching algorithm. The reconfigurable coil array achieves switching of the array's electromagnetic coil shape and structure via a piezoelectric drive bracket, supporting linear, rectangular, circular, and three-dimensional array shape conversions, with element spacing within... The range is continuously adjustable, and the optimization model based on the mutual inductance coefficient automatically avoids the grid lobes, with permalloy shielding layers added to adjacent units; The control and feedback module is based on "FPGA+DSP+AI algorithm". It establishes a mathematical model of electromagnetic field distribution according to the application scenario, combines the field distribution data fed back in real time by the multi-physics field detection module, calculates the optimal excitation parameters of each excitation source channel through the DSP running model predictive control algorithm, and sends control commands to the excitation source module and the reconfigurable coil array. The multiphysics detection module uses an array of Hall sensors and temperature / stress sensors to collect electromagnetic field distribution, power loss and environmental parameters in real time. The data is transmitted to the control and feedback module via a high-speed ADC.

2. The array electromagnetic excitation system for adaptively adjusting the spatial magnetic field strength according to claim 1, characterized in that: The intelligent matching algorithm is used to dynamically adjust the inductance / capacitance parameters of the adjustable impedance matching network, so that the power transmission efficiency is stabilized at a high level, and the reconfigurable coil array is driven to generate an electromagnetic field of sufficient strength.

3. The array electromagnetic excitation system for adaptively adjusting the spatial magnetic field strength according to claim 1, characterized in that, The AI ​​algorithm includes a genetic algorithm. When the field distribution data collected by the multiphysics detection module deviates from the target by more than 5%, the excitation parameters and the structure of the reconfigurable coil array are optimized by the genetic algorithm until the field distribution uniformity error is less than or equal to 5%.

4. An adaptive adjustment method based on the array electromagnetic excitation system of claim 1, characterized in that, Includes the following steps: S1: After the scene recognition module inputs the target field distribution parameters, the central control module calls preset models such as uniform field and focused field to calculate the initial configuration. According to the Biot-Savart law, it calculates the magnetic field generated by an electromagnetic coil with current flowing through it at any point on the axis. Due to the symmetry of the coil, the magnetic field generated by all current elements at P will cancel each other out in the components perpendicular to the axis, and only the components along the axis will be superimposed. Let the angle between dB and the axis be θ, then the magnetic field components along the axis... Combining geometric relationships, we can obtain: ； in, This represents the vector pointing from the current element to that point. This is the distance from the current element to that point. Refers to current element, is the magnetic permeability in vacuum; The magnetic field generated at any point in space by an array of electromagnetic coils is proportional to the current in the conductor, that is: ,in, It is the integral of the Biot-Savart linear coefficient of current over the current path, and its calculation formula is: ; The electromagnetic field generated by electric current follows the principle of vector superposition. In an environment with multiple current sources, the magnetic field at a point in space is formed by the vector superposition of multiple sources. ； In the formula, Indicates the number of field sources. These represent the magnitudes of the currents from each field source. It is the component of the magnetic field strength at that point in three-dimensional space. These represent the points in three-dimensional space, respectively. The three-dimensional components of the magnetic field generated by each coil; S2: Based on the calculation results, the array reconstruction module adjusts the cell position and shape, and the multi-parameter control module configures the excitation signal parameters; S3: The field distribution monitoring module collects data in real time. If the deviation from the target is >5%, the excitation parameters and array structure are optimized through a genetic algorithm until the field distribution uniformity error is ≤5%.

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