CN-121979360-A - Array electromagnetic excitation system and method for adaptively adjusting space magnetic field intensity

CN121979360ACN 121979360 ACN121979360 ACN 121979360ACN-121979360-A

Abstract

The invention relates to the technical field of electromagnetic excitation, discloses an array electromagnetic excitation system capable of adaptively adjusting the intensity of a space magnetic field, and aims to solve the problems of uneven field distribution, inflexible parameter regulation and control and weak scene adaptability of a traditional electromagnetic excitation system. The system constructs a 'multi-parameter independent regulation-self-adaptive power matching-reconfigurable array collaborative optimization' technical system, adopts a distributed intelligent control architecture of 'DDS+FPGA+AI algorithm', combines a frequency division band power amplification and dynamic impedance matching technology to realize independent regulation of electromagnetic parameters of an excitation source, and adjusts the distribution uniformity of an electromagnetic field by a piezoelectric driven reconfigurable coil array, a multi-physical field monitoring closed loop matched with a Hall sensor array and a temperature/stress sensor and a field-structure collaborative optimization algorithm. The invention can improve the energy transmission efficiency and scene self-adaptability, and realize electromagnetic excitation high-precision adjustment.

Inventors

LI YUAN
ZHANG ZIYANG
YANG GUANG
SHI NA
ZHANG YURU
CHEN YUANYUAN
LI KAI
ZHANG YUXIN

Assignees

中北大学

Dates

Publication Date: 20260505
Application Date: 20260115

Claims (4)

1. An array electromagnetic excitation system for adaptively adjusting the strength of a spatial magnetic field, comprising: the system comprises an excitation source module, a self-adaptive power amplification link, a reconfigurable coil array, a control and feedback module and a multi-physical field detection module, wherein each module cooperatively constructs a closed-loop control system of sensing, decision-making, executing and feedback; The excitation source module adopts a 'DDS chip+FPGA master control' architecture, is provided with a ROM memory and a PLL clock signal module, wherein the ROM memory is used for reading waveform data in parallel and supporting sine wave and square wave multi-waveform output, the PLL clock signal module combines a double-chip serial structure to realize dynamic regulation and control of the frequency, the phase and the duty ratio of 8-32 paths of independent channels, and each channel of output signals is accessed to the self-adaptive power amplification link after 16-bit D/A conversion; The self-adaptive power amplification link is based on a frequency division design, a low frequency band lower than 1MHz adopts a linear amplifier, a high frequency band higher than 1MHz adopts a radio frequency amplifier, and an adjustable impedance matching network for matching an E-type switch topology and monitoring input impedance in real time dynamically adjusts inductance/capacitance parameters through an intelligent matching algorithm; the reconfigurable coil array realizes the switching of the form and the structure of an array electromagnetic coil through a piezoelectric driving bracket, supports the form conversion of linear, rectangular, circular and three-dimensional arrays, and has the array element spacing between the array elements Continuously adjusting in a range, automatically avoiding grating lobes based on an optimization model of a mutual inductance coefficient, and additionally installing permalloy shielding layers on adjacent units; the control and feedback module takes an FPGA+DSP+AI algorithm as a core, establishes a mathematical model of electromagnetic field distribution according to an application scene, combines field distribution data fed back by the multi-physical field detection module in real time, calculates optimal excitation parameters of each excitation source channel through a DSP operation model predictive control algorithm, and sends control instructions to the excitation source module and the reconfigurable coil array; the multi-physical-field detection module adopts an array Hall sensor and a temperature/stress sensor to collect electromagnetic field distribution, power loss and environmental parameters in real time, and data are transmitted to the control and feedback module through a high-speed ADC.
2. The system of claim 1, wherein the intelligent matching algorithm is configured to dynamically adjust the inductance/capacitance parameters of the impedance-tunable matching network to stabilize the power transfer efficiency at a higher level and to drive the reconfigurable coil array to generate an electromagnetic field of sufficient strength.
3. The system of claim 1, wherein the AI algorithm comprises a genetic algorithm, and wherein the genetic algorithm optimizes the excitation parameters and the structure of the reconfigurable coil array until the field distribution uniformity error is less than or equal to 5% when the field distribution data collected by the multiple physical field detection modules deviates from the target by > 5%.
4. A method of adaptive tuning based on the array electromagnetic excitation system of claim 1, comprising the steps of: S1, after a scene recognition module inputs target field distribution parameters, a central control module calls a preset model such as a uniform field and a focusing field to calculate initial configuration, and calculates a magnetic field generated by an electrified electromagnetic coil on any point on an axis in space according to the Biaor-Saval law, wherein components of all current elements vertical to the axis are mutually offset and only overlapped along the axis direction due to the symmetry of the coil and the magnetic field components in the axis direction are overlapped when the included angle between dB and the axis is theta Combining the geometric relationship, the method can obtain: ; Wherein, the Representing the vector in which the current element points to that point, For the distance of the current element to this point, Refers to the current element of the current element, Is the permeability in vacuum; The magnetic field generated by the electromagnetic coil array at any point in space is proportional to the current in the wire, namely: , wherein, Is the integral of the linear coefficient of pito-savart with respect to current over the current path, which is calculated as: ; The electromagnetic field generated by the current accords with the vector superposition principle, and under the environment of a plurality of current field sources, the magnetic field at a certain point in space is formed by vector superposition of a plurality of field sources: ; In the formula, Indicating the number of field sources and, The current magnitude of each field source is represented separately, Is the component of the magnetic induction of the point in three dimensions, Respectively represent the first point in the three-dimensional space The individual coils generate three-dimensional components of the magnetic field; S2, driving an array reconstruction module to adjust the position and the form of the unit according to the calculation result, and configuring excitation signal parameters by a multi-parameter regulation module; and S3, the field distribution monitoring module collects data in real time, and if the deviation from the target is more than 5%, the excitation parameters and the array structure are optimized through a genetic algorithm until the error of the field distribution uniformity is less than or equal to 5%.

Description

Array electromagnetic excitation system and method for adaptively adjusting space magnetic field intensity Technical Field The invention relates to the technical field of electromagnetic excitation, in particular to an array electromagnetic excitation system and method capable of adaptively adjusting the intensity of a space magnetic field. Background In the application field related to electromagnetic excitation, the traditional electromagnetic excitation device has a plurality of limitations, and is difficult to meet the requirements of high-precision and multi-scene application, and the specific problems are as follows: The field distribution precision is insufficient, a single excitation source or a fixed array is difficult to form an electromagnetic field with uniform or specific forms, the electromagnetic field strength decays exponentially along with the distance, and the field intensity distribution gradient in an action area is large. This results in uneven material handling, and is unable to meet the excitation requirements of objects of complex shape (such as heat treatment of profiled work pieces, specific areas), for example, in the heat treatment process of engine profiled turbine blades, conventional devices are unable to uniformly heat each area of the blades, and heat treatment quality is affected. The parameter regulation and control flexibility is low, and the parameters of the excitation units of the fixed array structure cannot be independently regulated, so that the field distribution uniformity cannot be dynamically optimized according to the load change or the target area morphology. When the application scene is switched, the device is required to be disassembled and assembled again to adjust parameters, the operation is complex and time-consuming, the working efficiency is reduced, and the rapid application of the electromagnetic excitation technology in multiple scenes is limited. In view of the defects of the conventional technology, the invention designs an integrated and intelligent array electromagnetic excitation system which can adaptively adjust the space magnetic field intensity according to the application scene requirement and dynamically adapt to various scenes so as to solve the problems of the conventional technology. Disclosure of Invention In view of the above, the present invention is directed to an array electromagnetic excitation system and method for adaptively adjusting the spatial magnetic field intensity, which can adaptively adjust the spatial magnetic field intensity according to the application scene requirement and dynamically adapt to various scenes, so as to solve the above-mentioned problems in the prior art. In order to achieve the above object, the following technical scheme is adopted: An array electromagnetic excitation system for adaptively adjusting the spatial magnetic field strength, comprising: the system comprises an excitation source module, a self-adaptive power amplification link, a reconfigurable coil array, a control and feedback module and a multi-physical field detection module, wherein each module cooperatively constructs a closed-loop control system of sensing, decision-making, executing and feedback; The excitation source module adopts a 'DDS chip+FPGA master control' architecture, is provided with a ROM memory and a PLL clock signal module, wherein the ROM memory is used for reading waveform data in parallel and supporting sine wave and square wave multi-waveform output, the PLL clock signal module combines a double-chip serial structure to realize dynamic regulation and control of the frequency, the phase and the duty ratio of 8-32 paths of independent channels, and each channel of output signals is accessed to the self-adaptive power amplification link after 16-bit D/A conversion; The self-adaptive power amplification link is based on a frequency division design, a low frequency band lower than 1MHz adopts a linear amplifier, a high frequency band higher than 1MHz adopts a radio frequency amplifier, and an adjustable impedance matching network for matching an E-type switch topology and monitoring input impedance in real time dynamically adjusts inductance/capacitance parameters through an intelligent matching algorithm; the reconfigurable coil array realizes the switching of the form and the structure of an array electromagnetic coil through a piezoelectric driving bracket, supports the form conversion of linear, rectangular, circular and three-dimensional arrays, and has the array element spacing between the array elements Continuously adjusting in a range, automatically avoiding grating lobes based on an optimization model of a mutual inductance coefficient, and additionally installing permalloy shielding layers on adjacent units; the control and feedback module takes an FPGA+DSP+AI algorithm as a core, establishes a mathematical model of electromagnetic field distribution according to an application scene, combines field distr