9 results about "Degaussing" patented technology

This utility model discloses an anti-sticking electromagnetic suction head device, relating to the field of magnetic suction handling technology. Specifically, it includes a lifting plate, an electromagnet, and a side plate. The electromagnet is slidably connected to the lifting plate, with its side away from the lifting plate serving as the suction surface. The side plate is connected to the lifting plate and extends towards the electromagnet. When the electromagnet moves towards the lifting plate, its suction surface can move to a position between the end face of the side plate and the lifting plate, allowing the workpiece to be detached from the electromagnet's suction surface through the end face of the side plate. The electromagnet attracts and transports the workpiece. When the electromagnet is demagnetized, and its remaining magnetic force still attracts, the electromagnet retracts inward, causing the side plate to contact the workpiece on the electromagnet's suction surface, thus detaching the workpiece from the electromagnet's suction surface and preventing secondary attraction of the workpiece.

This invention discloses a method and apparatus for detecting and demagnetizing residual magnetism in the core of an electromagnetic current transformer, comprising: acquiring current and voltage signals; performing harmonic analysis on the current signal; performing integration processing on the voltage signal; performing phase decomposition on the even-order harmonic components based on the fundamental phase of the magnetic flux to extract the residual magnetism-related components; determining the normalized residual magnetism index based on the residual magnetism-related components and the odd-order harmonic components; using a controllable current source connected in parallel with the secondary circuit of the electromagnetic current transformer; and adjusting the polarity and amplitude of the controllable DC component using the normalized residual magnetism index as a closed-loop feedback signal to make the normalized residual magnetism index approach zero. This invention can detect the presence and level of residual magnetism in the core online without shutting down the electromagnetic current transformer or interrupting its metering and protection functions, and automatically implement closed-loop active demagnetization when the detected residual magnetism exceeds a safety threshold, restoring the core to a symmetrical magnetization working state without residual magnetism.

A novel and useful solid-state degauss circuit for use with electromagnetic door locks. The door lock circuit is configured to provide a current to the electromagnetic coil load. A pulse width modulation (PWM) controller varies the frequency and / or duty cycle to a switch in series with the coil. An active, solid-state degauss circuit in line with the current flowing through the coil is provided. When triggered either in an uncontrolled or controlled manner, the active degauss circuit composed of a solid-state device, creates a short circuit across the coil after current reversal is achieved thereby degaussing.

This disclosure provides a dynamic optimization and linkage control method for inspection processes. The method includes: dynamically constructing a magnetic field distribution map of the work area through a distributed sensor network; performing real-time fusion positioning of dual encoder data of the robotic arm joints based on the magnetic field distribution map; triggering linkage suppression between the demagnetizing coil and the shielding layer when the magnetic field strength at the robotic arm joint exceeds a preset threshold; planning the movement path of the robotic arm to avoid high interference areas according to the magnetic field distribution map, and adaptively adjusting the grasping movement speed of the robotic arm; detecting the grasping offset of the robotic arm end effector, and re-executing the magnetic field distribution map construction, linkage suppression, and high interference area avoidance optimization in the over-limit area until the robotic arm successfully grasps the target or an alarm is triggered. This method fundamentally solves the problem of robotic arm positioning drift and grasping failure caused by transient strong magnetic fields, improving the inspection efficiency and system stability in complex industrial environments.

This invention discloses a control system for rapid demagnetization of a continuous casting hydraulic station, including a PLC controller; the output terminal of the PLC controller is connected to the electromagnetic coil of the electromagnetic reversing valve of the continuous casting machine; it also includes a first RC absorption circuit, which is connected in parallel with the electromagnetic coil; the first RC absorption circuit includes a capacitor and a resistor connected in series; when the electromagnetic coil is de-energized, the capacitor absorbs the magnetic field of the electromagnetic coil and discharges, which is consumed by the resistor. When the coil is de-energized, the first RC absorption circuit rapidly releases the magnetic field energy through two steps of energy transfer and consumption, eliminating residual magnetism. At the instant the coil is de-energized, the inductor generates a reverse electromotive force. At this time, the parallel capacitor can take advantage of the characteristic that voltage cannot change abruptly to quickly accept this reverse electromotive force, converting the energy stored in the coil's magnetic field into the electric field energy of the capacitor, and quickly removing the energy source of the magnetic field.

This invention provides an active electron microscope demagnetization method, apparatus, and system based on FFT harmonic suppression feedback. The method includes the following steps: acquiring real-time time-domain signals of interfering magnetic fields along the X, Y, and Z axes to obtain three-axis discrete-time sequences; performing Fast Fourier Transform (FFT) on each of the three-axis discrete-time sequences to convert the signals from the time domain to the frequency domain, obtaining three-axis frequency-domain signals; decomposing the corresponding time-domain signals into at least six harmonic components based on the three-axis frequency-domain signals, and extracting the amplitude and phase parameters of each harmonic component; generating a compensation signal with the same amplitude but opposite direction to the interfering magnetic field based on the amplitude and phase parameters of each harmonic component; and determining the driving current required to drive the three-axis coils through a constant current source based on the compensation signal, so as to generate a dynamic compensation magnetic field with the same amplitude but opposite direction to the spatial magnetic field in real time. This invention enables real-time acquisition, frequency-domain analysis, and precise cancellation of environmental magnetic fields.

The application relates to a magnetic shielding dynamic degaussing simulation analysis method, an optimization method and a medium, wherein the simulation analysis method comprises the following steps: constructing a three-dimensional finite element model of a magnetic shielding structure, an internal air domain and an external infinite air domain; applying a magnetic insulation boundary condition to the outer surface of the external infinite air domain, and applying a constant geomagnetic bias field as a global static background field; applying a periodic alternating and exponentially decaying degaussing excitation to the magnetic shielding structure; under the degaussing excitation, based on a dynamic magnetization model, a multi-cycle step iteration and transient separation solving strategy is adopted to solve the dynamic evolution process of the magnetization intensity of the magnetic shielding material; after the degaussing excitation ends, the residual magnetization intensity distribution of the magnetic shielding material is determined, and the residual magnetic field distribution of the internal air domain is obtained based on the residual magnetization intensity distribution, so that the prediction accuracy and efficiency of the residual magnetic field are improved.