188results 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.

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.

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 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 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 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.

An aerosol-generating device and a controlling method thereof are provided. The aerosol-generating device may include a heating chamber configured to receive an aerosol-generating article, a heater configured to heat the aerosol-generating article in the heating chamber, an inductance sensor configured to measure an inductance value of a coil, a capacitance sensor configured to measure a capacitance value of a capacitor, and a controller configured to detect whether the aerosol-generating article is inserted based on the inductance value of the coil and the capacitance value of the capacitor.

The invention discloses a permanent magnet synchronous motor inductance matrix automatic calibration method and system, and the method comprises the steps: carrying out the system initialization, permanent magnet flux linkage reference calibration, weak magnetic region progressive current scanning, inductance parameter differential calculation and parameter integration, employing a positive and negative q-axis current symmetric excitation and differential operation mechanism as the core, and automatically counteracting the influence of a resistance item. Meanwhile, the weak magnetic working range of the d-axis current from-100A to-1000A is completely covered, and a full-working-condition inductance parameter two-dimensional mapping table is generated. The system does not need extra precision equipment, is small in algorithm calculation amount, is high in calibration efficiency, can adapt to batch application of a production line, can directly integrate a mapping table into a motor controller, achieves the real-time high-precision parameter calling through an interface function and two-dimensional linear interpolation, remarkably improves the torque precision and operation stability of field-weakening control of the permanent magnet synchronous motor, and is suitable for popularization and application. The method is suitable for motor parameter calibration in the fields of electric automobiles, industrial servo and the like.

The invention discloses an auxiliary device and method for rapidly determining three parameters of soft magnetic composite powder, and belongs to the technical field of soft magnetic material performance testing. The invention provides a simple device and method based on a medical injector and an insulated copper wire, aiming at solving the problems that a traditional testing method depends on complex equipment, steps are tedious, the cost is high and the efficiency is low. By measuring the inductance and the resistance of the coil and combining calculation of the size of an inner cavity of the injector and the length of a magnetic circuit, the quality factor, the effective magnetic conductivity and the direct-current bias of the soft magnetic powder can be quickly and accurately calculated. The device is simple in structure, mainly comprises an injector, an insulated copper wire, soft magnetic powder and an insulated rubber tape or transparent adhesive tape, and is convenient to operate and low in cost. The method is especially suitable for rapid quality detection of a production field and preliminary performance evaluation of a laboratory, can significantly improve the test efficiency and reduce the test cost, and has the advantages of simplicity, rapidness, low cost and high applicability.

The invention relates to a motor parameter identification method and device. The motor parameter identification method comprises the following steps: acquiring an initial motor parameter of a motor; acquiring operation data of the motor during operation of the motor; calculating a motor signal of the motor based on the operation data of the motor; and calculating an operating motor parameter of the motor using one or more algorithms based on the initial motor parameter and the motor signal.

The present invention relates to the technical field of power equipment, and in particular to a patch I-shaped inductance detection device, which can avoid the contact between the operator's fingerprints or other substances and the patch through setting, thereby improving the accuracy of patch inductance detection; it includes a detection box, a partition, a battery, a central processing unit, a first cable, a negative electrode induction detection sheet, a second cable, a detection tube, a positive electrode induction detection sheet, a display screen and multiple groups of control buttons, the partition is fixedly installed in the detection box, the bottom end of the battery and the top end of the partition are fixedly connected, the bottom end of the central processing unit and the top end of the partition are fixedly connected, the battery and the central processing unit are electrically connected, the bottom end of the first cable is electrically connected to the central processing unit, and the top end of the first cable is electrically connected to the bottom end of the negative electrode induction detection sheet; it also includes an air suction machine, a hose, an air suction pipe, a handle and a suction cup, the bottom end of the air suction machine and the top end of the partition are fixedly connected, the air suction machine and the central processing unit are electrically connected, and the input end of the air suction machine passes through the right end of the detection box and is connected to the left end of the hose.

The invention relates to a method for determining and / or ascertaining the difference in length between the d-axis and the q-axis of an ellipse, in particular for checking the anisotropy of the inductance of an electric motor during end-line commissioning. The invention also relates to a device, in particular a control unit, an electric machine and a computer program product.

A method for identifying an electric motor includes applying a first predefined current having a first frequency to a terminal of the electric motor. The method further includes calculating a first inductance value of the electric motor at the first frequency. The method includes applying a second predefined d-axis current having a second frequency to the terminal of the electric motor. The method also includes calculating a second inductance value of the electric motor at the second frequency. Further, the method includes obtaining a first deviation value and the second deviation value based on a comparison with a first reference value and a second reference value respectively. Finally, the method includes identifying the electric motor as one of an intended motor or a non-intended motor based on a comparison of each of the first deviation value and the second deviation value with a predefined threshold value.

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.

According to some embodiments, an aerosol-generating device includes: an inductive sensor that detects a change in inductance; an induction coil configured to generate a time-varying magnetic field by a current; a susceptor configured to heat an aerosol-generating article inserted into an accommodation space of the aerosol-generating device according to the time-varying magnetic field; a controller configured to: determine whether the aerosol-generating article is inserted into the accommodation space based on the change in inductance detected by the inductive sensor, start heating the susceptor by applying the current to the induction coil based on determining that the aerosol-generating article is inserted into the accommodation space, measure a frequency response of a coupling circuit formed in response to the current being applied to the induction coil, and determine whether to continue to heat the susceptor based on the measured frequency response.