269results about "Inductance measurements" patented technology

The invention discloses a system and method for measuring the opening and closing state of an electromagnetic valve, and relates to the technical field of electromagnetic valves.The method comprises the steps that after an electromagnetic valve control signal is triggered, dynamic inductance L at each moment t is obtained through real-time backstepping by means of a voltage and current sampling module integrated in a driving loop and an inductance analysis module in a local microcontroller MCU; gaussian filtering processing and derivative calculation are carried out on the dynamic inductance L in the edge calculation module, first-order derivative and second-order derivative characteristics are extracted, and an inductance mutation factor index Cimp is obtained through calculation. According to the method, clamping stagnation, rebound and discontinuous abnormal states occurring in the opening and closing process of the electromagnetic valve are comprehensively reflected, a sudden change threshold value Cthr is set and compared, and a set of dynamic opening and closing behavior diagnosis mechanism with high resolution and high adaptability is constructed. According to the method, high-frequency dynamic response extraction and abnormal trend quantification can be completed within 100 ms after the control signal is triggered, and the method has higher early warning capability and non-intrusive compatibility.

A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure phase information and amplitude associated with the resistive-inductive-capacitive sensor, and a noise detection circuit communicatively coupled to the measurement circuit and configured to determine a presence of external interference in the system based on at least one of the phase information and the amplitude information.

A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.

The invention discloses detection equipment for a manganese zinc ferrite magnetic core, which comprises a detection table, a protection cover is fixedly mounted on the top wall of the detection table, a feeding and discharging assembly is mounted in the detection table, a specification detection assembly is mounted on the top wall of the detection table, and a pressure detection assembly is mounted on the right rear part of the top wall of the detection table. A magnetic core body is placed on the top wall of the feeding and discharging assembly. According to the detection equipment for the manganese zinc ferrite magnetic core, the test of the magnetic core body in a low-temperature state is taken as an example, and cold air is blown into the protection cover under the mutual cooperation of the fan and the outdoor unit, so that whether the specifications of the magnetic core bodies with different specifications meet the use requirements or not can be measured, and the inductive performance of the magnetic core bodies can be tested in the low-temperature state; two detection functions can be achieved for the magnetic core body, the overall performance and the product specification of the magnetic core body can be detected, and unqualified magnetic core bodies can be prevented from flowing into the subsequent use process.

The invention relates to magnetic ring inductance inspection, and discloses a method for inspecting magnetic rings in batches. According to the method, inspection information of a to-be-detected magnetic ring group is obtained by using a batch inspection tool, and the information is input into a batch estimation model, so that an initial inspection result of the to-be-detected magnetic ring group is output. The batch prediction model is constructed based on a convolutional neural network, can predict the inductance value of each magnetic ring through test information, and judges whether the inductance value meets the standard or not. Compared with traditional one-by-one testing, the method has the advantage that the testing efficiency is remarkably improved. According to the method, the production process is optimized, and the overall production cycle is shortened by reducing unnecessary test steps.

The invention provides a parameter calculation method and device of a permanent magnet traction motor. The PHM board card is used for collecting the three-phase current of the permanent magnet traction motor, the decoding angle of the rotary transformer, the on-off state of the inverter and the intermediate voltage in the operation process of the traction converter of the motor train unit, so that the inductance, resistance and permanent magnet flux linkage of the permanent magnet traction motor of the motor train unit are monitored in real time, and other hardware facilities do not need to be added; according to the parameter observation scheme disclosed by the invention, the motor parameters can be quickly obtained according to the high-sampling-rate parameters, and an effective reference can be provided for motor state fault early warning.

A method and system for measuring distribution network system parameters based on harmonic injection, for use in a low-current grounding system containing an arc suppression coil. The system injects currents of multiple frequencies into the neutral point of the low-current grounding system through an injection source and measures the neutral point voltage. The system uses formulas to calculate and obtain the line capacitance, arc suppression coil inductance, and damping resistance parameter values ​​in the distribution network system. This application can accurately measure line capacitance, arc suppression coil damping resistance, and reactance by injecting only two frequencies of current. This method has little impact on grid operation, high measurement accuracy, and broad application prospects.

The invention discloses a high-field impedance spectroscopy measurement method, system and device for a piezoelectric material and a medium, and relates to the technical field of high-field impedance spectroscopy measurement, and the method comprises the steps: loading a sweep frequency signal generated by a signal generator to the piezoelectric material in a high field, and reading a current signal and a current signal amplitude of the piezoelectric material; comparing the read current signal amplitude with a set current constant value, changing the voltage value of the sweep frequency signal according to a set voltage change step length when the current signal amplitude is out of an error range, and outputting the sweep frequency signal of the current frequency; and obtaining a final current signal of the piezoelectric material through the sweep frequency signal of the current frequency, fitting the final current signal to obtain an admittance circle diagram, and measuring the strong field impedance spectrum of the piezoelectric material according to the admittance circle diagram. Corresponding operation and judgment are carried out according to the relation between the current amplitude and the set current error range and the current constant value, and it is guaranteed that the measured current is kept constant all the time.

A system and method for measuring mutual inductance between adjacent first communication transmission line and second communication transmission line is disclosed. The system includes a mutual inductance measurement circuit that includes a coupling generator which biases the first communication transmission line with a current ramp signal; a sample and hold circuit which captures an induced voltage on the second communication transmission line using a switched capacitor storage element; a switched capacitor integrator configured to integrate the induced voltage onto an output voltage node; and a comparator configured to switch states once the switched capacitor integration has surpassed a reference trippoint.

The invention discloses a cable high-frequency impedance characteristic analysis method based on bipolar trapezoidal wave excitation, and belongs to the technical field of power equipment state monitoring and fault diagnosis. In order to solve the problems of low test efficiency, insufficient high-frequency parameter modeling precision and weak anti-interference capability in cable high-frequency impedance characteristic analysis of a traditional sine wave excitation method, the method comprises the following steps: generating an odd-symmetry bipolar trapezoidal wave excitation signal with specific frequency and amplitude, and injecting the signal into the head end of a cable to be tested through a coupling device after power amplification; synchronously acquiring a high-frequency response signal of the key position of the cable under the excitation of the bipolar trapezoidal wave by using a data acquisition system; preprocessing the high-frequency response signal, converting the high-frequency response signal into a frequency domain through Fourier transform, calculating input impedance of the cable under different harmonic frequencies, and synthesizing a broadband impedance spectrum; based on the broadband impedance spectrum, the amplitude-frequency characteristic and the phase-frequency characteristic of impedance are analyzed, and cable state evaluation, partial discharge detection, insulation defect diagnosis or fault point positioning are realized. The method is used for an electric power system.

The invention relates to a component insertion loss test method, system and terminal, and relates to the technical field of insertion loss, and the method comprises the steps: obtaining loss test result information and test component model information; determining test reference result information and a result deviation reference interval according to the model information of the test component; analyzing a deviation condition between the loss test result information and the test benchmark result information and taking the deviation condition as result deviation information; determining a result deviation value according to the result deviation information; and determining test parameter adjustment information according to the falling condition of the result deviation value and the result deviation reference interval, and outputting the test parameter adjustment information to the insertion loss test device for adjustment so as to perform loss test again. According to the invention, common personnel can conveniently carry out insertion loss detection.

The invention relates to the technical field of testing and positioning devices, and discloses a transformer testing and positioning device which comprises a supporting table, a supporting cylinder is fixedly installed at the top end of the supporting table, the top end of the supporting cylinder is of a closed structure, and a rotary table is rotatably installed at the top end of the supporting cylinder; four positioning grooves are formed in the upper surface of the rotary table in the circumferential direction at equal intervals in a penetrating mode, a bracket is slidably installed on the inner wall of each positioning groove, and two through holes are formed in the top end of each bracket in a penetrating mode. The positioning clamping plates hinged to the periphery of the top end of the bracket are mutually folded under the extrusion effect of the side walls of the positioning grooves, the transformer placed on the bracket is pushed to the middle position, the contact pin position of the transformer can be conveniently and automatically positioned, the transformer is clamped and fixed through the four clamping plates, and the positioning efficiency is improved. And the pins of the transformer are prevented from moving when being in contact with the positive conductive elastic sheet and the negative conductive elastic sheet, so that poor contact and influence on the subsequent test effect are avoided.

The invention relates to the technical field of power equipment detection, and discloses a power equipment prediction and early warning device, which comprises a data acquisition module, a voltage and current two-port impedance matrix construction module, a voltage and current two-port impedance matrix construction module, a voltage and current two-port impedance matrix construction module and a voltage and current two-port impedance matrix construction module, wherein the data acquisition module is used for acquiring power equipment transformer coil turn voltage and transformer coil temperature; the dual-port network is used for acquiring impedance characteristics of the power equipment and predicting faults of the power equipment according to the impedance characteristics of the power equipment, and the fault analysis module is used for analyzing the faults of the power equipment through a voltage and current two-port impedance matrix, processing the faults of the power equipment according to nodes, carrying out cluster processing on multiple nodes and processing cluster processing conflicts. And the fault analysis module realizes intelligent detection and intelligent fault detection of the transformer of the power equipment, and greatly reduces the complexity of the detection system.

Flexible, longitudinally extended sensors comprising variably resistive and / or inductive sensing material. Sensors connect to an external processing unit using as few as 2 wires. In operation, sensors measure resistance / inductance along their longitudinal extent (curve). Spectral de-multiplexing allows electrical property differences along sensors to be resolved. This enables shape tracking of the flexible sensor. The sensor principles are suitable for the production of ultra-small diameter probes (for example, smaller than 0.5 mm) of arbitrary length (for example, 30 cm long). There are potential advantages for cost efficiency and ease of manufacture. The sensor can be constructed as a shape tracked guidewire to enable endovascular navigation procedures. The sensor's tracked shape enables deformation tracking of the anatomy. Using the sensor's tracked shape rather than repetitive X-ray imaging improves navigational accuracy and reduces exposure to radiation.

The invention discloses a servo motor fault diagnosis method and system based on data model analysis, and the method comprises the steps: analyzing the current performance of a servo motor through a current reconstruction method, drawing a current linear diagram of a filter, and constructing a motor mathematical model under a synchronous rotating coordinate system of the servo motor according to the current linear diagram; constructing a torque-speed model and a position-speed model of the servo motor based on a data driving method according to the Newton's law and the kinematics relationship, and combining to obtain a position model; and performing fault diagnosis on the servo motor according to the discrete multi-phase current set. Through deep analysis of real-time current signals, fault features are identified more accurately, a multi-dimensional model is established, fault diagnosis is more comprehensive and systematized, fault identification credibility is improved through classification and reliability evaluation of fault feature quantities, a function panel provides visual fault diagnosis result display, and an operator can understand and make a decision conveniently.

The invention relates to the technical field of high-voltage direct-current power transmission, and particularly provides a saturable reactor field detection method and device, and the method comprises the steps: collecting high-frequency parameters of an in-operation saturable reactor, and analyzing the abnormal conditions corresponding to the high-frequency parameters of the in-operation saturable reactor; on-site detection is carried out on the in-operation saturable reactor based on the abnormal condition corresponding to the high-frequency parameter of the in-operation saturable reactor; wherein the high-frequency parameters comprise volt-second product, impact inductance and current ratio. According to the technical scheme provided by the invention, the performance change of the in-operation saturable reactor is mastered through the high-frequency parameters of the in-operation saturable reactor, and accurate evaluation of the state of the in-operation saturable reactor and rapid discrimination of the fault are realized, so that safe and reliable operation of the ultra-high-voltage direct-current converter valve is ensured.

The invention relates to a magnetic suspension motor detection device, and relates to the technical field of detection devices.The magnetic suspension motor detection device comprises a bottom plate, a workbench is arranged at the center of the top of the bottom plate, a lower detection table is arranged at the top of the workbench, a hinge is arranged on one side of the outer wall of the lower detection table, and the lower detection table is connected with an upper detection table through the hinge; a groove is formed in the lower detection table, a spring plate assembly is arranged in the groove, a detection probe is arranged on one side of the spring plate assembly, a connecting assembly is arranged on one side of the detection probe, a driving mechanism is arranged in the upper detection table, an arc-shaped pressing plate is arranged on one side of the driving mechanism, and a rotating shaft is arranged on one side of a hinge. Through the design of the modularized probe, the self-adaptive clamping mechanism and the linkage power supply, the rapid synchronous detection of the electrical and magnetic properties of the magnetic suspension motor is realized, the efficiency and the precision are remarkably improved, the manual intervention is reduced, and the requirements of multiple models are met.

The invention discloses coil inductance detection equipment with a multi-angle polarization simulation function, and relates to the technical field of coil detection, and the detection equipment simulates a polarization effect through arranging three vibration units with mutually vertical vibration directions below a mounting seat. By controlling the vibration intensity in three directions and changing the included angle between the two vibration units in the horizontal direction, polarization of multiple angles and various different polarization are simulated, the control mechanism controls the adjusting mechanism according to the change of the magnetic field of the coil in the vibration process, the vibration intensity is dynamically adjusted through the adjusting mechanism, and the vibration intensity is adjusted. Therefore, the influence of vibration on inductance change when the coil works and the influence of reverse coil change on vibration are simulated, closed-loop feedback is formed, and the detection precision is improved.

The present invention relates to a stylus pen, and more particularly, to a stylus pen which can clearly distinguish hover operation, contact operation, and pen pressure operation, has a simple internal structure, is easy to sense pen pressure, has relatively little change in performance due to assembly deviation, and can reduce manufacturing cost, and more particularly, to a stylus pen which can clearly distinguish hover operation, contact operation, and pen pressure operation. A stylus according to an embodiment of the present invention comprises: an inductor unit; a first elastic member disposed apart from the inductor part; a core body which is disposed so as to pass through the inductor unit and which is moved in the direction toward the first elastic member by an external force acting on one end portion of the core body; and a magnetic body which is disposed between the inductor part and the first elastic member and which is compressed by the movement of the core when the magnetic body is interlocked with the core to change the separation distance from the inductor part, the first elastic member being compressed by the movement of the core.

To provide an apparatus for detecting a stacking direction of internal electrodes of a multilayer capacitor and a detecting method thereof.SOLUTION: An apparatus for detecting a stacking direction of internal electrodes of a multilayer capacitor 100 includes a capacitor moving unit 1 having a supply unit 2 to which a plurality of multilayer capacitors are continuously supplied and moving the supplied multilayer capacitors in one direction, a sensor unit 10 including a coil, installed on the capacitor moving unit, and detecting inductance of the coil when each of the multilayer capacitors approaches the coil to determine a stacking direction of internal electrodes of the multilayer capacitor based on the detected inductance of the coil, and a separating unit 5 installed on the capacitor moving unit and separating a multilayer capacitor 100' selected as an unsuitable multilayer capacitor by the sensor unit.SELECTED DRAWING: Figure 3

The detection method uses an inductive loop detection system (10) comprising: - at least one inductive detection loop (L1... L8) embedded in the area, - a resonation capacitor array (14) intended to detect vehicles thanks to a change in the inductance of at least a loop (12) determined by conductive material of the vehicles. The detection system (10) comprises a test inductor (LT) with a first switch (24) for connecting the test inductor (LT) to the resonation capacitor array (14) in place of the detection loop (L1 ... L8), the test inductor (LT) having a defined and known inductance, so that the effect of the test inductor (LT) on a resonance signal of the resonation capacitor array (14) is known and is compared with a reference signal. In case the resonance signal is different from the reference signal, the method comprises a recalibrating step for recalibrating the resonation capacitor array (14).

The present invention relates to a substrate processing equipment, and more particularly, to a substrate processing equipment equipped with a current, voltage and power measurement module for measuring the current / voltage applied for generating and maintaining plasma, and further for measuring the power of incident and reflected waves. The present invention discloses a substrate processing equipment comprising a process chamber, a substrate support unit, a gas injection unit, and at least one RF power source. The substrate support unit includes a heater and an RF energy blocking part installed above the heater. A current, voltage and power measurement module is installed adjacent to a grounding wire, which is connected to the RF energy blocking part, to measure the RF voltage, current, and power of an incident wave and a reflected wave generated by the plasma.

In one example, circuit (100) includes an emulate current generator (114) configured to provide an emulate current signal in response to a charge current and a discharge current. The emulate current signal may represent an emulate current (EI) through an output inductor. A comparator (116) is configured to provide a comparator signal in response to the emulate current signal and a sense current signal representing a measured value of a current (EI) through the output inductor. An inductor code counter (134) is configured to adjust an inductor code count value in response to the comparator signal. In response to the inductor code count value, a slope of the emulate current signal can be adjusted.

The present disclosure provides a parameter calculation method and device of a permanent magnet traction motor. The present disclosure uses a PHM board to collect the three-phase current of the permanent magnet traction motor in the operation process of the motor train unit traction converter, the resolver decoding angle, the switch state of the inverter and the intermediate voltage to monitor the inductance, resistance and permanent magnet flux of the motor train unit permanent magnet traction motor in real time, without adding other hardware facilities, saving the system cost. The parameter observation scheme of the present disclosure can quickly obtain the motor parameters according to the high sampling rate parameters, and can effectively reference the motor state fault warning.

This application provides a power converter and a method for measuring an inductance value of an inductor in the power converter. The power converter includes a controller and a direct current-direct current conversion circuit. An input of the direct current-direct current conversion circuit is configured to connect to a photovoltaic module. The direct current-direct current conversion circuit includes the inductor, a main switch, and a diode. The controller is configured to: in a start process of the power converter, control the main switch in the direct current-direct current conversion circuit to be turned on or turned off, to collect a waveform of a current flowing through the inductor; when the collected waveform of the current flowing through the inductor is discontinuous, obtain an inductance value of the inductor based on the waveform of the current flowing through the inductor; and output an inductor exception alarm signal when the inductance value of the inductor is less than a first threshold. The power converter can obtain the inductance value of the inductor when the current flowing through the inductor is discontinuous, to monitor a status of the inductor, thereby improving reliability of the power converter.

The DC switch for the controllable disconnection of a DC line is designed to determine the inductance present on the load side by switching it on for a definable period of time, which is significantly shorter than 1 s, and calculating the inductance from at least the current achieved, the input voltage applied, and the length of the period of time.

The invention discloses a mutual inductor electrical performance verification method, which adopts a digital bridge with a direct current bias function, uses the digital bridge to detect an actually measured bias current inductance value of an iron core, calculates a theoretical bias current inductance value of a mutual inductor finished product, and also uses the digital bridge to detect the actually measured bias current inductance value of the mutual inductor finished product. According to the method, the actually measured bias current inductance value of the finished mutual inductor is compared with the theoretical bias current inductance value of the finished mutual inductor, so that whether the iron core is degraded after being assembled into the finished mutual inductor in the processes of winding, assembling, potting and aging is judged, and then whether the consistency of the direct current resistance and the half-wave error of the finished mutual inductor is qualified is judged. The equipment used in the invention has the advantages of lower cost, high detection efficiency and short test time, and is favorable for improving the production efficiency.

A method and electronic device for determining the resistance of a battery cell are disclosed. The method includes the steps of: performing an EIS analysis of the battery cell based on a plurality of temperatures including a first temperature and a second temperature to obtain a graph relating the impedance of the battery cell to a frequency variation; extracting a first inductance of the battery cell at the first temperature based on a first graph relating the impedance of the battery cell at the first temperature; and determining the resistance of the battery cell at a second temperature based on the first inductance, wherein the second temperature is higher than the first temperature.

This invention relates to a testing method for an IGBT circuit system, comprising the following steps: applying a pulse signal to a single IGBT transistor; obtaining the current waveform in the overall circuit using a current probe; obtaining the voltage waveforms at locations V1, V2, and V3 of each component using a voltage probe; testing the stray inductance of the bus power supply; testing the stray inductance of the multilayer copper busbar; and testing the total stray inductance of the IGBT module under test. The advantages of this invention are: it can measure the bus capacitance, multilayer copper busbar, and total stray inductance of the IGBT module separately.