180 results about "Coil array" patented technology

The invention provides an intelligent eddy current nondestructive testing method and system based on a flexible GMR sensor array, and relates to the technical field of nondestructive testing. According to the invention, a GMR sensor array and a micro excitation coil array are integrated on a flexible substrate, and synchronous acquisition under multi-frequency and multi-phase excitation is realized by establishing a probe-workpiece unified space coordinate system and a time synchronization reference; performing temperature drift compensation, attitude correction and gap normalization processing on the original response tensor to generate a corrected response tensor; the intelligent inversion model based on the prior constraint of the electromagnetic field jointly identifies the conductivity, the thickness and the crack parameters, and outputs a defect parameter map and a confidence map; and a detection report containing the position, the size, the depth and the confidence coefficient is generated through spatial clustering and connectivity analysis, so that high-sensitivity and high-reliability nondestructive detection under a complex curved surface structure is realized.

The invention discloses a dynamic electromagnetic shielding method for a complex electromagnetic environment and a shielding device thereof, and the method comprises the steps: obtaining real-time voltage data in the complex electromagnetic environment, carrying out the voltage feature analysis, outputting a feature vector of a real-time voltage signal, and analyzing the type of an interference source of a current electric field according to the feature vector, performing interference trend time sequence prediction processing on the feature vector through a pre-trained LSTM model according to the interference source type to obtain a time domain voltage value and a phase deviation value, and performing composite loss coefficient calculation on the time domain voltage value and the phase deviation value to obtain a composite loss coefficient; and performing reverse offset signal synthesis processing on the voltage interference signal according to the calculated composite loss coefficient, performing coil dynamic activation processing on a preset multi-coil array according to the synthesized reverse offset signal, generating a directional offset magnetic field corresponding to the real-time electromagnetic interference, and performing electromagnetic offset shielding on the current electromagnetic interference. According to the invention, transient interference can be responded in time, and the electromagnetic shielding effectiveness can be improved.

The invention relates to the technical field of robot intelligent actuators, and discloses a magneto-rheological end effector accurate grasping system based on force feedback, which comprises a multi-curved-surface bionic fingertip formed by a magneto-rheological elastomer, and a three-dimensional distributed excitation coil array is embedded in the fingertip. The coil array is excited by a high-frequency chopping constant-current driving module to generate a space gradient magnetic field, and the magnetic field changes the shear modulus of the elastomer within millisecond-level time, so that the fingertip surface hardness jumps in real time along with a control instruction; and the force feedback closed-loop control unit comprises an ultrathin film strain sensing net attached to the inner curved surface of the fingertip. Through time-sharing switching of a negative pressure micropore adsorption layer and a magneto-rheological rigidity keeping mode, traditional adsorption and rigid clamping are changed into a pre-fixing and rigidity gradual change two-section type process, instantaneous force impact during adsorption release is eliminated, meanwhile, thin film wrinkling caused by continuous negative pressure is avoided, and it is ensured that an ultrathin and high-added-value workpiece is kept flat and traceless in the whole transfer process.

The invention discloses an anti-offset wireless charging method, which comprises the following steps of: constructing a transmitting coil array as a charging end, detecting a relative position between a receiving coil of equipment needing wireless charging and the charging end, calculating offset data of the receiving coil, and taking a current state of each sub-coil in the transmitting coil during charging as a decision variable; constructing a dual-objective optimization mathematical model taking the minimum mutual inductance deviation and the maximum system transmission efficiency as optimization objectives, solving the dual-objective optimization mathematical model by adopting a genetic algorithm, searching to obtain a Pareto optimal solution set, selecting the Pareto optimal solution set, and controlling the current state of a transmitting coil in a charging end; through a decision variable control mechanism based on the sub-coil current state, the control granularity is refined from the whole coil unit to the sub-coil level, so that the system can dynamically adjust the current distribution mode in the unit according to the tiny offset of the receiving coil, local fine tuning of the magnetic field intensity is realized, and the precision of the magnetic field intensity is improved. And the coupling requirement under the complex offset working condition can be effectively met.

The invention relates to the technical field of industrial control, in particular to an SMT production process quality control method and system. The SMT production process quality control system comprises a soldering paste distribution condition real-time acquisition module, an electromagnetic coil array parameter adjustment module and a reinforcement learning module. The electromagnetic coil array is arranged around the reflow soldering furnace, the infrared thermal imaging technology is combined, the thermal image of the PCB is obtained in real time and sent into the soldering paste segmentation model to be processed, the flowing state of the soldering paste is accurately represented, the system can dynamically adjust the control parameters of the electromagnetic coil array based on the soldering paste distribution thermodynamic diagram, and the stability of the reflow soldering system is improved. Comprise current intensity, current frequency, waveform and the like, so that the electromagnetic field is accurately adjusted, the flowability of the solder paste is optimized, excessive or too little solder paste accumulation is avoided, and the risks of solder bridge and insufficient solder are reduced.

The invention discloses an intelligent magnetic field generator device based on deep learning and a control method. The device comprises a coil array, a programmable current control module and a deep learning module. The coil array adopts an equidistant square matrix structure and is used for generating specific magnetic flux density distribution in a space target area; the programmable current control module is used for adjusting the power-on current amplitude and direction of each coil of the coil array; and the deep learning module is used for establishing a nonlinear mapping relation between the magnetic field distribution of the space target area and the coil current configuration of the coil array so as to realize magnetic field reverse reconstruction and current parameter prediction. The invention aims to solve the problems of complex modeling, difficulty in solving an inverse problem, low control precision and poor flexibility in a magnetic field adjustment process in the prior art, and quick inverse solution and high-precision reproduction from target magnetic field distribution to coil current parameters are realized through the magnetic field generator device.

A multilayer coil and a multilayer coil array, each including a body in which a magnetic layer is laminated, a first coil including a plurality of first coil conductor layers in a lamination direction, and a second coil including a plurality of second coil conductor layers in the lamination direction. The first and second coils are inside the body, first and second external electrodes are electrically connected to the first coil, and third and fourth external electrodes are electrically connected to the second coil. The first to fourth external electrodes are on a bottom surface of the body, the second coil is at a position farther from the bottom surface of the body than the first coil is in the lamination direction, and the multilayer coil includes a first extended conductor inside the body and connecting an end of a first coil conductor layer closest to the bottom surface.

The invention discloses a paper folding structure inductance type self-decoupling miniature six-dimensional force sensor, which belongs to the technical field of force sensors and comprises a base, a folding flexible circuit board, a metal shell, a communication cable, a coil inductance measuring circuit and an elastic body. The folding flexible circuit board comprises a coil array and an inductance measuring circuit, the coil array is folded on the upper surface and the four side faces of the base, the inductance measuring circuit is folded at the bottom of the base, and a communication cable is led out of the inductance measuring circuit. The metal shell is arranged above the base and surrounds the surface, except the bottom surface, of the folding flexible circuit board; an elastic body is arranged between the metal shell and the base. The elastomer converts six-dimensional force borne by the metal shell into six-dimensional displacement. According to the sensor, the characteristic that the eddy current effect is sensitive to normal displacement and insensitive to tangential displacement and rotation is utilized, self-decoupling measurement of six-dimensional displacement of the metal shell is achieved in combination with three-dimensional coil layout, and therefore self-decoupling six-dimensional force measurement is achieved, and the sensor can be integrated to the fingertip of the dexterous hand to provide endogenous tactile perception.

The invention discloses a six-degree-of-freedom magnetic suspension workbench structure and a control method thereof, belongs to the technical field of magnetic suspension workbenches, and aims to solve the problems that the stroke of a traditional workbench is difficult to expand, the modeling precision is low, and the influence of a coil edge effect is large. The magnetic suspension workbench structurally comprises a stator capable of being spliced with a PCB coil array, a rotor of a symmetric two-dimensional Halbach permanent magnet array, a data processing module with an information fusion function and an H-bridge-containing driving and real-time control system. According to the control method, a high-precision electromagnetic force model is established, a magnetic field area is divided, a compensation coefficient is introduced to correct an end effect, a pseudo-inverse method based on least square is adopted to decouple and calculate the size of a driving current, and the saturation suppression of the current and the dynamic gating of the coil are realized in combination with a current calculation result; the method can be applied to the fields of precision machining and micro-nano manufacturing, and high-precision long-stroke motion control is achieved.

An RF coil array includes: a first coil unit including a first fixing belt formed of a first stretch material stretchable in a first direction and RF coils independently disposed on the first fixing belt; and a second coil unit including a second fixing belt formed of a second stretch material stretchable in the first direction and RF coils independently disposed on the second fixing belt. The first coil unit is mounted on a subject with a distal end of the first fixing belt directed from one side to the other side of the subject in the first direction, and the second coil unit is mounted on the subject with a distal end of the second fixing belt directed from the other side to the one side of the subject in the first direction such that at least a part of the second coil unit overlaps the first coil unit.

This invention relates to the field of magnetic stimulation technology, providing a time-coherent, multi-target, precisely adjustable magnetic stimulation method and system. The method includes constructing a coil array at the desired magnetic stimulation site. The coil array includes a first coil positioned at the center of the array and multiple second coils positioned around the periphery of the first coil. The first coil and the desired second coils are then energized. The frequency of the high-frequency alternating current supplied to the first coil and the energized second coils is controlled to generate a low-frequency envelope induced electric field between the first and second coils. The current amplitude ratio of the coil pair consisting of the first coil and one of the energized second coils is adjusted to adjust the focusing area of ​​the low-frequency envelope induced electric field, precisely locating and stimulating the desired target point. This invention improves stimulation depth and focus, and enables simultaneous stimulation of multiple targets, achieving adjustable, controllable, and precisely positioned stimulation without moving the coil positions.

Tracking a pose of a portion of an anatomical structure using an inverted-direction electromagnetic navigation system may comprise generating a signal comprising a plurality of frequencies. The signal comprising the plurality of frequencies may be received at a transmitter coil array. The transmitter coil array comprises a plurality of transmitting micro coils. Each of the plurality of transmitting micro coils is coupled to a portion of an anatomical structure of a patient. In response to receiving the signal comprising the plurality of frequencies, an electromagnetic field may be generated at each of the plurality of transmitting micro coils based on the received signal. Each of the generated electromagnetic fields may be detected at a receiver coil array comprising at least one receiving coil. A pose of at least one of the plurality of transmitting micro coils may then be determined.

The invention provides a marine electromagnetic take-off and landing transportation system based on a heavy-load unmanned aerial vehicle, and belongs to the technical field of unmanned aerial vehicle marine heavy-load transportation. The system comprises a shipborne electromagnetic take-off and landing subsystem, a shore-based electromagnetic take-off and landing subsystem, a heavy-load fixed-wing unmanned aerial vehicle, a marine low-altitude communication monitoring network and a comprehensive scheduling platform; the shipborne electromagnetic take-off and landing subsystem is of a multi-section coil array structure, the effective length of a coil array of the shipborne electromagnetic take-off and landing subsystem can be matched with the available space of a fishing ship deck, the take-off and landing distance is controllable, and therefore the problem of take-off and landing in the narrow space of the deck is solved. The shore-based electromagnetic take-off and landing subsystem is integrated with a three-dimensional terrain modeling module, the real-time environment of a landing area is pre-judged through laser radar and satellite remote sensing data, parameters of an electromagnetic propulsion device and an electromagnetic adsorption device of the shore-based electromagnetic take-off and landing subsystem are dynamically adjusted, then the shore-based electromagnetic take-off and landing subsystem adapts to rugged terrain, and the limitation that a traditional unmanned aerial vehicle depends on a flat take-off and landing field is avoided. And through data linkage and intelligent scheduling of multiple subsystems, the overall efficiency and reliability of marine transportation are greatly improved.

The invention belongs to the technical field of wireless charging, and particularly relates to an in-vitro charging device of a wireless charging system and implantable medical equipment, the in-vitro charging device comprises an inverter and a transmitting coil array, and the inverter is electrically connected with the transmitting coil array so that a transmitting coil can generate an induced magnetic field; wherein the transmitting coil array comprises at least two coil units which are connected in series, and all the coil units are coaxially superposed; the coil unit comprises two coils connected in series, and the two coils are symmetrically arranged and partially overlapped. The four-coil array is innovatively adopted as the transmitting end, magnetic decoupling is achieved among the coils through a special spatial arrangement mode, and it can be always guaranteed that at least part of the coils and the receiving coil of the in-vivo charging device are in a good coupling state under the condition of deviation in any direction through the design.

The invention provides a coil array and a wireless power transmission system, the coil array comprises at least one coil structure, the coil structure comprises three coil units, and the three coil units respectively form three sides of the same triangle so as to form the coil structure; wherein each coil unit in the same coil structure is configured to allow the current flowing through the coil unit to form a current loop, and the coil units in the same coil structure are the same or different; moreover, each coil unit in the same coil structure is configured to be excited by an independent amplitude-modulated wave and obtain a driving current, so that the coil array is allowed to be configured to obtain optimal magnetic field distribution and magnetic field polarization according to different phases and current directions and form a three-dimensional rotating magnetic field.

The application discloses a kind of pipe inner wall high-pressure pulse cleaning system and method suitable for central air conditioner, it is related to pipeline cleaning technical field, including movable electromagnet coil array, for generating the magnetic field inside the elbow of pipeline, change the motion trajectory of magnetite particles;Pulse synchronous controller, for detecting the working state of pulse cleaning equipment and with pulse cleaning equipment synchronous control movable electromagnet coil array power-on time and magnetic field intensity;Eddy current buffer flow guide, the application is by movable electromagnet coil array, with pulse cleaning equipment electric connection pulse synchronous controller and install in elbow inside eddy current buffer flow guide, realizes the accurate control of magnetite particles motion trajectory in high-pressure pulse cleaning process and kinetic energy buffer, thoroughly solves the centrifugal acceleration wear problem at elbow under the premise of not reducing cleaning effect.

The present application is drawn to a system and method, as well as method for manufacture of a device and system for determining the position and orientation of at least one magnetic field sensor comprising: a rigid structure comprising an array of at least five electromagnetic coils; at least one wire that connects to and powers the electromagnetic coils; wherein the placement and orientation of the electromagnetic coils on the rigid structure are predetermined; wherein the electromagnetic coils, each having a predefined magnetic moment per unit current, are constructed with a printed circuit board (PCB) comprising at least one conductive layer; and wherein the system is configured such that a stray magnetic field emanating from the at least one, as measured at the location of the at least one magnetic field sensor, generates substantially lower magnetic field intensity than that produced by each of the at least five electromagnetic coils.

A kind of wide piece shuttle weaving machine with controllable weft insertion speed, including piece shuttle, weft insertion track and three-axis mobile suction cup, weft insertion track includes permanent magnet array track and electromagnetic coil array track, electromagnetic coil array track is arranged on the two sides of permanent magnet array track, the two ends of weft insertion track are provided with three-axis mobile suction cup, synchronous belt is arranged between three-axis mobile suction cup, three-axis mobile suction cup is used to suck piece shuttle to move back and forth on the synchronous belt directly above weft insertion track, piece shuttle includes shuttle body and dewar container, the two sides of shuttle body are symmetrically installed with permanent magnet array that interacts with electromagnetic coil array track to realize the weft insertion movement of piece shuttle, the inside of shuttle body is installed with weft gripper for clamping weft, the bottom of shuttle body is connected with the top of dewar container, dewar container is filled with liquid nitrogen, the bottom of dewar container is inserted with superconductor that interacts with permanent magnet array track to realize the suspension of piece shuttle.The design not only improves the width of loom, but also improves the adaptability of weft.

The utility model provides a non-contact current nuclear phase device, which relates to the technical field of electric power detection and comprises a three-phase cable, a coil array, a signal receiving and processing device and an upper computer. The coil array, the signal receiving and processing device and the upper computer are electrically connected in sequence, and the coil array is arranged between the signal receiving and processing device and the three-phase cable. According to the utility model, the coil array is arranged between the signal receiving and processing device and the three-phase cable, so that the sensor is prevented from being too close to the cable, the measurement condition is looser, and the installation safety of the measurement device is better guaranteed; each coil group in the coil array is provided with two magnetic core-containing coils of which the sensitive directions are perpendicular to each other, interference signals can be better eliminated, each magnetic core-containing coil contains a manganese-zinc magnetic core, the sensitivity of the coils is enhanced, smaller current can be measured, longer-distance measurement can be realized, and the installation of the measuring device is more convenient.

The application provides an anti-offset coil array structure and a double-channel resonant circuit, and belongs to the technical field of electric vehicles. The structure comprises a receiving coil array and a transmitter, the receiving coil array and the transmitter are arranged in parallel with each other, and a preset distance exists between the plane where the receiving coil array is located and the plane where the transmitter is located; each first receiving coil in the receiving coil array is coupled with a transmitting coil in the transmitter, and each second receiving coil in the receiving coil array is coupled with the transmitting coil; when the horizontal offset between the receiving coil array and the transmitter increases, the first mutual inductance between each first receiving coil and the transmitting coil increases, and the second mutual inductance between each second receiving coil and the transmitting coil decreases, so that the total mutual inductance of the anti-offset coil array structure is constant. The application can reduce the volume of the anti-offset coil array structure and improve the anti-offset capability of the wireless charging system.

The invention provides an inductance type force torque sensor. The inductance type force torque sensor comprises a coil array and a signal processing circuit board. The coil array comprises a plurality of groups of first detection coils and a plurality of groups of second detection coils, the first detection coils and the second detection coils are fixedly arranged on a first surface of the signal processing circuit board, and the signal processing circuit board comprises an inductance digital converter, an inductance chip, a capacitor and a controller; the controller is used for determining relative inductance according to the coil digital signal; determining deformation displacement generated after the to-be-measured object is stressed according to the relative inductance and the reference inductance; determining the force borne by the to-be-measured object according to the deformation displacement generated after the to-be-measured object is stressed; the torque borne by the to-be-measured object is determined according to the force borne by the to-be-measured object and the deformation displacement generated after the to-be-measured object is stressed, the coil signal transmission path is shortened, the inductance type force torque sensor is not prone to vibration interference, and therefore the measurement precision of the inductance type force torque sensor is improved.

The invention relates to a multi-degree-of-freedom offset detection device of a wireless charging system, and belongs to the technical field of mining equipment tests. The device comprises a base, a transmission screw rod group, a driving motor group, a drag chain module, a coil bearing frame and a detection and control system. The base bears the whole device, and the transmission lead screw set and the driving motor set convert rotary motion into linear motion. The detection and control system controls the driving motor and the driving coil bearing frame to perform two-dimensional or three-dimensional scanning, the detection coil array induces magnetic field change to generate a voltage signal, and the accurate offset of the receiving end relative to the transmitting end on multiple degrees of freedom is worked out through processing; accurate feedback is provided for power self-adaptive adjustment or mechanical deviation correction of the wireless charging system, and the wireless charging system has the advantages of high precision, high reliability, strong anti-interference capability, moderate cost, intelligent integration and the like.

The invention discloses an eddy current detection-based steel-cored aluminum strand breakage defect identification method and equipment, and relates to the technical field of steel-cored aluminum strand breakage defect identification, and the eddy current detection-based steel-cored aluminum strand breakage defect identification method comprises the following steps: installing an annular vector coil array probe formed by a plurality of excitation coils on a to-be-detected steel-cored aluminum strand, and controlling the driving parameters of each excitation coil to identify the breakage defect of the steel-cored aluminum strand; constructing a vectorized excitation magnetic field on the surface of the steel-cored aluminum strand; based on the vectorized excitation magnetic field, a multilayer selective penetration strategy is constructed, and excitation mode sets used for detecting peripheral areas of the surface layer aluminum strand, the inner layer aluminum strand and the steel core are sequentially generated; collecting eddy current signals in each excitation mode and performing layered feature extraction to form corresponding layered feature vectors; and performing fusion discrimination based on the hierarchical feature vectors, and generating an identification result of the broken strand defect of the steel-cored aluminum strand. According to the invention, the problems of excitation magnetic field distortion, signal aliasing and insufficient deep defect identification sensitivity in a multi-layer stranded structure in traditional eddy current detection are solved.

The invention discloses a flywheel energy storage system, method and equipment based on an adversarial network algorithm and a medium, and belongs to the technical field of magnetic suspension bearings, and the flywheel energy storage system comprises an HTS static suspension system, an AMB dynamic control system and an axial-radial decoupling integration module; the HTS module comprises a superconducting unit, a cooling unit and a mechanical calculation unit, and non-contact axial supporting of the flywheel rotor is achieved through the superconducting magnetic flux pinning effect. The AMB module comprises an electromagnetic structure unit, a magnetic field calculation unit and a control algorithm unit, and an electromagnetic coil array and a PID (Proportion Integration Differentiation) controller are used for performing rotor radial control; the decoupling module comprises a mechanical coupling unit, a sensor unit and a communication and synchronization unit, a force action range is divided through a dynamic equilibrium equation set, and a displacement sensing network is formed by the laser range finder and the Hall array. The static suspension force, the dynamic stability and the control precision of the hybrid bearing system are improved, and an efficient and reliable solution is provided for bearing application under high-speed rotation and complex working conditions.

The application provides a coil unit and a coil array, comprising a coil body and a magnetic shielding layer; the coil body is configured to allow a current flowing therethrough to form a current loop, and the coil body comprises at least a first wire segment, a second wire segment and a third wire segment connected in sequence; the first wire segment and the third wire segment both extend along a first direction and are spaced apart along a second direction; the second wire segment extends along the second direction; and the first direction and the second direction are arranged transversely; the magnetic shielding layer has a thickness dimension along the second direction; at least part of the thickness of the magnetic shielding layer along the second direction is located between the first wire segment and the third wire segment; and the second wire segment passes through at least part of the thickness of the magnetic shielding layer along the second direction.

This invention discloses a planar motor with a hybrid arrangement of coreless coils and permanent magnets, comprising a stator, a mover, a Hall sensor array, and a controller. The permanent magnet array and the coreless coil array on the stator surface are arranged on the same plane in an alternating array. The mover structure, from the center outwards, consists of a wireless energy receiving coil, an inner ring magnet, and an outer ring magnet, achieving passive levitation through a balance of attraction and repulsion. The controller calculates the mover position using a Hall fingerprint positioning algorithm and only powers the stator edge coil group corresponding to the mover's edge magnets. When the coils on the mover overlap with the stator coils, it switches to wireless energy transmission mode to provide power to the mover. This invention enables the product to achieve self-levitation, low-power edge drive, and wireless power supply when power is off, making it suitable for various application scenarios.

An automatic positioning and moving DR device comprises a mechanical arm, a control system, a moving and lifting unit and a detector. One end of the mechanical arm is connected with the movable lifting unit, the other end of the mechanical arm is provided with an X-ray emitter and a light bundling device, and the detector is an independent component; the detector is internally provided with a coil array capable of outputting space four-corner coordinates and SID and a gyroscope capable of outputting an inclination angle; based on the mapping relation between the reference data manually placed in the center of the beam light and the coordinate system of the mechanical arm, the control system obtains the coordinates of the detector in real time within the recognition range and converts the coordinates into position instructions of the mechanical arm so as to achieve automatic positioning. After the system completes coordinate system mapping of the mechanical arm through one-time reference acquisition, the position of the detector is tracked in real time within the recognition range, the mechanical arm is automatically driven to be aligned, and the shooting efficiency and the positioning precision are improved.

This invention discloses an anti-clogging biofiltration device coupled with a microbial fuel cell, applied in the field of biofiltration technology. It includes: a biofilter consisting of a porous media coarse filter layer, a cathode region, and an anode region arranged sequentially from top to bottom; a Helmholtz coil array deployed around the biofilter; and an external circuit that, together with the anode and cathode regions, constitutes the microbial fuel cell. The microbial fuel cell provides self-sufficient power to the cathode region, anode region, and Helmholtz coil array for anti-clogging biofiltration. This invention effectively solves the problems of accumulated clogging in EPS (expanded power filters) and the inability to clean the bottom filter media, and realizes self-generated electricity for the microbial fuel cell.

The application relates to the technical field of dual-nuclear magnetic resonance imaging, in particular to a dual-nuclear magnetic resonance imaging device which comprises an inner shell body defining an examination space; an outer shell body which is detachably fixed to the inner shell body and defines an installation space surrounding the examination space with the inner shell body; a first coil array comprising a plurality of first coils which are attached to and fixed on the outer surface of the inner shell body; a second coil array comprising a plurality of second coils which are arranged on the outer circumferential side of the first coil array at a specified radial interval, the second coils having different resonance frequencies from the first coils; and a plurality of support assemblies arranged in the circumferential direction and supported by the inner shell body, each of the support assemblies comprising a lifting member which can be detached from the support assembly and supports the second coils, the lifting member being capable of selectively approaching or moving away from the inner shell body so as to adjust the size of the radial interval.

To provide an RF coil array capable of obtaining relatively high sensitivity in subjects of various sizes.SOLUTION: An RF coil array according to the present disclosure includes a first coil unit including a first securing belt made of a first stretch material stretchable in a first direction and a plurality of RF coils disposed independently on the first securing belt, and a second coil unit including a second securing belt made of a second stretch material stretchable in the first direction and a plurality of RF coils disposed independently on the second securing belt. The first coil unit is attached to the subject with the distal end of the first fixing belt directed from one side to the other side in the first direction of the subject, and the second coil unit is attached to the subject with the distal end of the second fixing belt directed from the other side to the one side in the first direction of the subject such that at least a part of the second fixing belt overlaps the first coil unit.SELECTED DRAWING: Figure 7