18 results about "Eddy current effect" patented technology

This disclosure provides an X-ray imaging device and a wireless power transmission device with electromagnetic shielding. The wireless power transmission device includes: a first annular structure, on which a first frame is fixed, and a first winding is wound; a second annular structure, on which a second frame is fixed, and a second winding is wound; wherein the second annular structure is rotatable relative to the first annular structure; and a metal shielding assembly disposed relative to the first winding and / or the second winding, the metal shielding assembly being used to generate a reverse magnetic field based on the eddy current effect to weaken the main magnetic flux of the wireless power transmission device. This disclosure utilizes the reverse magnetic field generated by the metal shielding assembly based on the eddy current effect to weaken the main magnetic flux of the wireless power transmission device, thereby reducing magnetic field leakage and thus reducing electromagnetic interference of the wireless power transmission device.

The present application relates to a kind of permanent magnet shielding motor vector control energy efficiency optimization method considering magnetic field lagging phase angle, belong to permanent magnet shielding motor control field.It is characterized by: by analyzing shield sleeve eddy current effect, the analytical expression of magnetic field lagging phase angle is derived using electromagnetic field theory;The lagging phase angle is introduced into permanent magnet flux linkage term to be corrected, and the eddy current loss of shield sleeve and stator iron loss are combined into equivalent iron loss component, and a system controllable loss model is constructed;Under the constraint of constant torque, the analytical expression of total controllable loss about direct-axis current is derived and the optimal direct-axis current given value is solved.The actual application introduces angle compensation in the coordinate transformation link of vector control system, and the optimal direct-axis current given value is sent into current regulator, the accurate decoupling of dq axis current is realized, the total loss of motor is reduced, so as to improve the overall efficiency of motor control system.

This invention discloses an R-T-B sintered magnet with reduced eddy current losses, its preparation method, and its application. The magnet has partition grooves on one or two orientation surfaces, where each orientation surface is perpendicular to the orientation direction of the magnet. The partition grooves extend through the magnet in a first extension direction but not in a second extension direction. The first extension direction of the partition grooves is perpendicular to the orientation direction of the magnet, and the second extension direction is parallel to the orientation direction of the magnet. By creating crisscrossing partition grooves on the magnet and filling them with an insulating layer, this invention increases the resistivity of a thin layer on the magnet's surface by a certain thickness, significantly reducing motor power loss due to eddy current effects. The insulating layer filling the grooves increases the resistivity of both the magnet surface and the grooves, effectively preventing conduction due to poor processing or current breakdown when the groove width is narrow. It also compensates for the reduction in mechanical strength caused by the grooving, ultimately resulting in a low-eddy-current, high-strength sintered magnet.

The application provides a metal film thickness measurement method and device for tungsten gate chemical mechanical polishing, comprising a sensor probe, a power module, a signal excitation module, a differential amplification module, a synchronous demodulation module, a data acquisition and processing module; the sensor probe comprises coaxially arranged excitation coils, detection coils and balance coils; the signal excitation module drives the three-coil resonance module to induce eddy current effect at the metal film to be measured; the differential amplification module converts the equivalent impedance change caused by the eddy current effect in the coils into a differential signal, and simultaneously improves the dynamic range through low-noise amplification; subsequently, the synchronous demodulation module multiplies the differential signal with a reference signal, and extracts a direct current component proportional to the signal amplitude through a low-pass filter; the obtained voltage amplitude signal is input into the data acquisition and processing module; the application can significantly amplify the weak signal related to the film thickness, effectively suppress common-mode noise, obtain nanometer-level thickness resolution, and has a high signal-to-noise ratio.

The application provides a non-metal pipeline metal marker detection method and device based on an eddy current effect, and relates to the technical field of non-metal pipeline detection. The method installs a metal marker carrying binary code on a pipeline, excites the eddy current effect of the metal marker by applying an alternating magnetic field, and picks up an induced magnetic field signal. The device adopts a double-D-shaped anti-phase series differential eddy current probe combined with a four-stage signal conditioning chain to improve the anti-interference ability and signal quality, and then extracts multi-domain features of the marker in the amplitude, phase and frequency spectrum. By matching the extracted features with a preset database, the device accurately analyzes the binary code and spatial position of the metal marker, thereby uniquely determining the identity information of the pipeline, including the ownership, material, burial depth and direction, etc. The application realizes high-precision positioning, large-capacity identity code and strong anti-interference detection, and effectively solves the problems of weak anti-interference, small code capacity and limited detection depth and precision in the existing non-metal pipeline positioning technology.

A coil includes: a multi-turn coil; the multi-turn coil is distributed in a first coil layer and a second coil layer; the first coil layer and the second coil layer are different coil layers arranged vertically; the first coil layer and the second coil layer are connected; both the first coil layer and the second coil layer are composed of multiple strands wound together, the first coil layer and the second coil layer are symmetrically arranged about a central axis, each strand within each turn of the coil includes a first region extending along an arc, and the ratio of the corresponding radii of the inner and outer edges of each strand within the first region is the same in the width direction. This application splits each turn of wire into multiple strands to suppress eddy current effects and reduce eddy current losses. Furthermore, the ratio of the inner and outer diameters of each strand within each turn of the coil is the same. In scenarios where the number of coil turns is small and an ultra-thin structure design is required, this effectively reduces the internal resistance of the coil, thereby achieving a high-Q coil design.

The application discloses a magnet assembly for a rotating speed sensor and a preparation method thereof, and relates to the field of rotating speed sensors.The magnet assembly comprises a magnet structure, a copper sleeve structure and a cladding structure.The copper sleeve structure is located at the bottom of the magnet structure and is used to be connected with the magnet structure so that the magnet structure is assembled with a fine rotating shaft of a motor.The cladding structure is located outside the magnet structure and the copper sleeve structure and is used to claddingly fix the magnet structure and the copper sleeve structure and to protect the magnet structure from being broken.The magnet structure, the copper sleeve structure and the cladding structure are cooperatively arranged.The cladding shell is cladded outside the magnet main body and the copper sleeve main body.The anti-rotation claw part and the anti-rotation groove are used to protect the magnet main body and the copper sleeve main body from rotating, which is beneficial to enhancing the bonding strength of the copper sleeve main body and the magnet main body and solving the problem of the interference of the eddy current effect of the traditional copper sleeve inner injection molding magnet scheme during overall magnetization.

The present application relates to the technical field of drilling processing, and discloses a photovoltaic frame drilling equipment, which comprises a base and a supporting plate arranged on the base, further comprises: a mounting plate vertically and slidingly arranged on the supporting plate; a displacement shell fixed on one end of the mounting plate away from the supporting plate; a drilling motor fixed above the displacement shell; and a transmission shaft fixed on the drilling motor. The four N-pole permanent magnets and the four S-pole permanent magnets establish a strong constant magnetic field around the flying disc. When the drill bit, drill chuck, transmission shaft, deviation rectifying bearing and flying disc are tilted, the tilted flying disc cuts the magnetic induction lines in the magnetic field during rotation, so that the eddy current effect is generated in the flying disc. The eddy current effect generates a reverse damping force on the flying disc, which directly acts on the flying disc and is transmitted to the transmission shaft through the deviation rectifying bearing, so as to correct the tilting state of the transmission shaft, drill chuck and drill bit, and effectively avoid the hole position deviation caused by the continuous tilting of the drill bit during the drilling process.

The utility model provides a kind of electric wall brushing tool of underground continuous wall slot section rigid joint, comprising: lifting ring, for being connected with crane;Rigid force arm, upper surface is fixedly connected with lifting ring, the end of rigid force arm is welded fixed with limit casing;Motor is located inside limit casing, and the output of motor is vertically downward setting, and the top of motor is welded fixed with the lower surface of rigid force arm;The output of motor is fixedly connected with rotating shaft, and rotating shaft is coaxial with the output of motor, and motor is used to drive rotating shaft rotation;Steel brush, fixedly covered in rotating shaft outer surface, steel brush is used to clean underground continuous wall slot section rigid joint;The underground continuous wall slot section rigid joint is circular-arc slot section joint.The utility model solves the problem that cross steel plate and H-shaped steel anti-eddy current effect is poor in the process of underground continuous wall construction, and the right-angle corner of cross steel plate and H-shaped steel is difficult to clean.

The utility model relates to a crane track defect detection and identification device relates to crane track detection technical field, it can realize to the high efficiency, accurate detection and identification of crane track surface and internal defect, and guarantee the safe operation of crane and the long -term stability of track. Crane track defect detection and identification device, the eddy current sensor is used for close crane track surface but does not produce physical contact, and through generating high frequency magnetic field to excite the eddy current effect in the track and detect the small change of track surface and inside, the eddy current sensor through wireless transmission module real -time sends the data gathered to remote receiver, and the data received by remote receiver is amplified, filtered, digitized processing and defect identification by data processing and analysis system, and through display module shows the data analysis result and the specific position and severity of defect that the eddy current sensor feedbacks.

The utility model relates to medical detection equipment technical field discloses a kind of mixing device based on tubercle bacillus drug sensitive detection, including storage bucket, the upper portion of the storage bucket is provided with sealing mechanism, the inside of the storage bucket is provided with storage mechanism, the storage mechanism includes motor, the bottom of the motor is fixedly installed in the inside bottom middle portion of storage bucket, the top of the motor is fixedly connected with the shaft of a steam turbine.The utility model drives the rotation of placing disc by bottom motor shaft, and stable mechanical power output can realize the efficient mixing of rotating sample and diluent, centrifugal force and eddy current effect are generated in rotation to promote liquid layering, accelerate uniform mixing, and motor speed is controllable, avoid traditional method to shake unevenly, shorten mixing time, directly reduce drug sensitive detection period, further applicable to high-throughput experimental environment, can support batch processing sample, also can integrate full-automatic detection system, reduce manual intervention, reach laboratory intelligent trend.

This invention discloses a winding reuse-based self-sensing system and method for motor rotation angle based on the eddy current effect, belonging to the field of micro-motor sensing and control technology. It includes a brushless coreless motor rotor, a non-magnetic conductive strip disposed on the rotor surface, a multi-pole coil winding, and a high-frequency measurement and decoupling module connected to the winding. During operation, the high-frequency module injects a high-frequency excitation signal into the multi-pole coil winding; as the rotor rotates, eddy current coupling occurs between the conductive strip and the coil winding, causing the equivalent impedance of the coil winding to change regularly with the rotation angle. By isolating and decoupling and extracting the impedance change signal, combined with the timing relationship, the real-time rotation angle of the motor can be calculated. This invention cleverly reuses the original winding resources of the motor, eliminating the need for an external traditional encoder, and has advantages such as extremely high spatial integration, non-contact and wear-free operation, and resistance to low-frequency electromagnetic interference.

This invention provides a sensor detection device based on the eddy current effect, comprising: a compensation module that compensates for temperature drift from -20°C to 150°C using a dual-coil differential structure and improves magnetic field uniformity through an elliptical coil design; a multi-parameter coupling module for establishing a three-dimensional decoupling model of impedance-displacement-temperature to handle the interaction between the moving and stationary scales; a determination module for determining a preset number of current vibration factors of the eddy current sensor within the current cycle; and a judgment module for statistically determining the state of the eddy current sensor based on the current vibration factors. The sensor detection device based on the eddy current effect of this disclosure can determine in real time whether the eddy current sensor is faulty, so as to maintain the normal operation of the thermal power unit when the eddy current sensor fails, avoiding economic losses caused by abnormal shutdown of the thermal power unit.

Disclosed in the present application are a method for establishing an analysis model for a surface permanent magnet synchronous motor, and a motor control method. The method for establishing an analysis model for a surface permanent magnet synchronous motor comprises: first, establishing vector magnetic circuit models for a surface permanent magnet synchronous motor, regarding the arc tangent value of the ratio of equivalent magnetic reactance to magnetic reluctance as an iron loss angle, and using the iron loss angle to reflect the impact of an eddy current effect and a magnetic hysteresis effect, which cause iron losses, on motor performance and motor control; on the basis of vector magnetic circuits, providing (I) coordinate transformation and an (I) coordinate system; and then establishing an analysis model for the surface permanent magnet synchronous motor, which analysis model comprises a flux linkage equation and a voltage equation that are based on the vector magnetic circuits and the (I) coordinate system, and on the basis of the provided analysis model, establishing a position-sensor-free control method for the surface permanent magnet synchronous motor. The present application fully takes into consideration the impact of an eddy current effect and a magnetic hysteresis effect, which cause iron losses, on motor performance and motor control, is simple and convenient, and has clear physical significance, thereby improving the accuracy of rotor position identification in the position-sensor-free control for a surface permanent magnet synchronous motor.

The invention provides a detection device for battery safety based on an eddy current effect and a battery device. The battery safety detection device comprises a high-frequency oscillator, the high-frequency oscillator is arranged near an explosion-proof valve of a battery unit of a battery device, the high-frequency oscillator comprises an inductance coil, the high-frequency oscillator is used for driving the inductance coil to generate an alternating magnetic field, and the alternating magnetic field enables the explosion-proof valve to generate an eddy current effect; the eddy current effect enables the current of the inductance coil to change, and the high-frequency oscillator outputs a changed oscillation electric signal; and the signal detection circuit receives the changed oscillation electric signal output by the high-frequency oscillator and determines an amplitude signal or a frequency signal of the oscillation electric signal, and the amplitude signal or the frequency signal is used for determining the internal pressure of the battery unit.

This application relates to a metal material identification system, method, and medium based on dual-coil detection and dynamic frequency scanning, belonging to the field of inductive sensor technology. The metal material identification system includes: a dual-coil detection module, used to generate a sweep signal within a preset frequency range according to a coil control signal, to excite the eddy current effect of the target object, and to detect and amplify the corresponding induced oscillation signal; a digital output module, used to output the material identification result of the target object; and a control module, used to generate a coil control signal according to the sweep parameters, receive the induced oscillation signal, calculate the metal quality factor, and match and identify the material of the target object by combining a preset material standard parameter range. Through dual-coil mutual inductance verification and dynamic frequency scanning technology, the dependence on material is reduced, and high-precision identification of all-metal materials is achieved, meeting the application scenarios for mixed materials.

The application discloses a kind of permanent magnet shielding motor mathematical model construction methods considering magnetic field lag phase angle, belong to permanent magnet shielding motor control field;By analyzing shielding sleeve eddy current effect, shielding sleeve is approximated as infinite flat structure, lag angle analytical calculation formula after magnetic field passes through shielding sleeve is derived using electromagnetic field diffusion equation;The lag angle is introduced into permanent magnet flux linkage term and is corrected, and the dq axis voltage equation considering lag effect is established.The application quantitatively describes the relationship between shielding sleeve eddy current effect and magnetic field phase lag by deducing the analytical expression of magnetic field lag angle, so that the mathematical model more accurately reflects the actual electromagnetic characteristics of shielding motor, and realizes the accurate decoupling of dq axis current.In actual application, the angle compensation is introduced in the coordinate transformation link of vector control system, the transformation angle is corrected as the difference between rotor position angle and lag angle, which improves the current utilization rate and reduces the motor loss, thereby improving the overall efficiency of motor control system.

This invention discloses an emergency braking and automatic reset device and method for amusement rides, relating to the field of amusement ride technology. The device includes a train body and a braking component. A plurality of connecting bases are arrayed between two guide rails, and a third fixing frame is provided between the connecting bases. A brake plate is installed at the bottom of the train body. The braking component is mounted on the third fixing frame, and triggering components are symmetrically arranged at both ends of the third fixing frame. The triggering component includes a triggering mechanism and a transmission mechanism. This invention employs purely mechanical triggering eddy current braking, requiring no electrical commands and avoiding the risk of electrical failure preventing triggering. It utilizes the non-contact eddy current effect to generate braking force, eliminating any wearing parts and the maintenance burden of frequent brake pad replacements. Simultaneously, it integrates an automatic reset function, automatically unlocking and resetting via sensors and electromagnets, significantly improving the reliability of emergency braking and the operational efficiency of the equipment.