107results about "Inductance measurements" patented technology

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 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 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.

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 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.

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 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.

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.

An aerosol supply device is configured to receive at least a portion of an article comprising an aerosol-generating material. The aerosol supply device includes a sensor coil and a processor. The processor is configured to detect a reactance associated with the sensor coil resulting from the article being received by the aerosol supply device. The processor is configured to determine article information from the reactance.

Large-signal inductance measuring device for performing a measuring operation for measuring an inductance at an electrical energy supply line arrangement operated with a DC voltage, the large-signal inductance measuring device including: a disconnecting switch for electrically disconnecting the first conductor of the energy supply line arrangement; a first series circuit including a first capacitive arrangement and a first diode arrangement; a first measuring device for measuring a first change in voltage after the first conductor is disconnected; a second series circuit including a second capacitive arrangement and a second diode arrangement; a second measuring device for measuring a second change in voltage after the first conductor is disconnected; a third measuring device for measuring a third current on the first conductor before the first conductor is disconnected; and an evaluation device for evaluating the measured first change in voltage, the measured second change in voltage, and the measured third current.

The invention relates to the technical field of power system relay protection, in particular to a voltage division inductance determination method for arc grounding fault arc extinction of a series voltage division type power distribution network and application of the voltage division inductance determination method. Through series voltage division of a passive structure, compared with a traditional topological structure, only an isolation transformer is adopted, a step-up transformer structure is not adopted, the investment of large-capacity equipment is reduced, and meanwhile, the arc extinction error influence caused by the step-up transformer is eliminated; on the other hand, the inductance coil of a passive structure is connected in series for voltage division, so that the capacity of the active arc extinguishing device is effectively reduced on the basis of improving the arc extinguishing effect; and on the other hand, a proper series inductance value is selected for voltage division based on the capacity of the isolation inverter, so that dual optimization of the capacity and the control effect of the inverter is realized, and the problem of how to carry out arc extinction on a single-phase earth fault in the series voltage division type power distribution network is solved.

The disclosure relates to a method of measuring winding electrical parameters in a bipolar stepping motor during hold conditions. Disclosed herein is a method for controlling a stepper motor driver comprising control logic, a digital-to-analog converter (DAC), and two H-bridge circuits for controlling a first winding and a second winding of a bipolar stepper motor. The method includes determining a desired current signal for the winding based on a rotational position of the stepping motor, converting the desired current signal to an analog reference voltage using the DAC, generating a pre-drive signal based on the analog reference voltage, and controlling the H-bridge circuit to regulate a current through the winding using the pre-drive signal. A voltage drop across the sense resistor is monitored as feedback by the control logic. The desired current signal is determined by generating periodic current patterns of the windings over time, the current pattern of the second winding being phase shifted with respect to the current pattern of the first winding, and the two current patterns being dependent on the step frequency of the bipolar stepping motor.

The invention discloses a resistance-capacitance-inductance measuring device based on a single-chip microcomputer, and the device comprises the single-chip microcomputer; the function switching module is electrically connected with the single-chip microcomputer and used for sending a measurement target signal to the single-chip microcomputer so as to enable the single-chip microcomputer to output a waveform control signal; the signal generator is electrically connected with the single chip microcomputer and used for generating sine waves based on the waveform control signals; the loading module is electrically connected with the signal generator, is used for applying sine waves to the tested element, and is matched with the tested element to form a low-pass filter circuit; the comparator is electrically connected with the loading module and is used for acquiring the output wave from the low-pass filter circuit, comparing the output wave with the sine wave to generate a difference signal and transmitting the difference signal to the single chip microcomputer; and the analog-to-digital converter is electrically connected with the loading module and is used for converting the output wave and transmitting the output wave to the single chip microcomputer. According to the invention, the measurement range does not need to be manually determined, the resistance, capacitance and inductance can be automatically and rapidly measured only by determining the type of the element to be measured, the method is more convenient, and the measurement efficiency can be greatly improved.

The invention provides a method for obtaining an inductance of a primary winding (L1) of a transformer of a flyback converter comprising a power switch (Sw) electrically connected in series with the primary winding (L1) of the transformer. The method comprises applying (M1) a DC voltage (Vin) to an input of the flyback converter, switching (M2) the power switch (Sw) from the non-conducting state to the conducting state and measuring a switch-on time until the power switch (Sw) switches from the conducting state to the non-conducting state as a result of the current (ip) flowing through the power switch (Sw) in the conducting state reaching a maximum current value (Îp), and computing (M3) the inductance of the primary winding (L1) of the transformer using the measured switch-on time, the DC voltage (Vin) and the maximum current value (Îp). Further, a control unit for controlling the flyback converter is disclosed.

The application discloses a method and device for monitoring inductance values of GIS branch bus, equipment and storage medium, wherein the method comprises: obtaining a three-phase distribution mode contained by the GIS branch bus; segmenting the GIS branch bus according to the three-phase distribution mode to obtain one or more bus segments; respectively establishing corresponding three-dimensional finite element simulation models for the bus segments; determining model parameter values of the three-dimensional finite element simulation models, wherein the model parameter values comprise inductance parameter values, and the inductance parameter values comprise self-inductance parameter values of three-phase conductors and mutual inductance parameter values between the three-phase conductors and a shell. The self-inductance parameter values and the mutual inductance parameter values can consider the three-phase wiring mode and trend, and the influence of other conductive bodies in the surrounding environment on the parameter calculation, so that accurate inductance parameters at different positions in the complete GIS branch bus line are obtained, and a more accurate three-dimensional finite element simulation model can be built.

Flexible, longitudinally extended sensors comprising variably inductive sensing material. Sensors connect to an external processing unit using as few as 2 connections. In operation, sensors measure 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 invention relates to the technical field of circuit system analysis, in particular to a method, a system and equipment for measuring parameters of a transformer. An excitation current source is applied to the primary side of a to-be-measured transformer, an open circuit of the secondary side is kept, the alternating voltage of the secondary side is measured, the real part and the imaginary part of the ratio of the alternating voltage of a secondary side winding to the alternating input current of a primary side winding are calculated, and the excitation resistance and the excitation inductance of a magnetic core are obtained according to the real part and the imaginary part. Stopping applying excitation, measuring port resistance and inductance from a primary side port, and calculating primary side leakage resistance and leakage inductance in combination with obtained excitation parameters; and opening the primary side, measuring the port resistance and inductance from the secondary side port, and calculating the secondary side leakage resistance and leakage inductance in combination with excitation parameters. The testing method is easy and convenient to operate, the calculation process is simplified, and the parameter measuring precision of the transformer is effectively improved.

A current sensor fault detection method, apparatus, and device, and a storage medium. The method comprises: determining an alpha-axis current response and a beta-axis current response according to a space voltage vector corresponding to a permanent magnet synchronous motor (S10); then, according to the alpha-axis current response and the beta-axis current response, determining a direct-axis inductance and a quadrature-axis inductance corresponding to the permanent magnet synchronous motor (S20); and finally, performing fault detection on a current sensor according to the direct-axis inductance and the quadrature-axis inductance (S30).

This invention relates to the field of magnetically coupled wireless power transfer (MC-WPT) technology, specifically disclosing a method and system for detecting mutual inductance in an MC-WPT system based on frequency modulation and phase shift control. When the system experiences parameter drift and is no longer in a resonant state, frequency modulation control is used to ensure the power factor angle at the transmitting end is within a preset range, and phase shift control is used to ensure the phase angle at the receiving end is 90°, causing the system to resonate again. The mutual inductance between the coupling mechanisms is calculated based on the resonant frequency at this point, the fundamental output voltage of the transmitting end's full bridge, and the current in the resonant circuit of the receiving end, or vice versa. Due to the introduction of frequency modulation and phase shift control, this mutual inductance detection and measurement can be very accurate. Experiments have verified that the accuracy of mutual inductance detection using this invention is high.

The present invention relates to a substrate processing equipment, and more particularly, to a substrate processing equipment equipped with a current / voltage / 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 / 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.

The invention discloses a control circuit of a permanent magnet synchronous motor and an identification method thereof, a pulse generation circuit provides a first driving signal, a comparison circuit compares a first current with a first reference current, and outputs a first level when the first current is greater than or equal to the first reference current; the pulse capture circuit acquires the first time of the first driving signal, and the conversion circuit acquires the first voltage of the bus of the inverter circuit; the pulse generation circuit provides a second driving signal, the comparison circuit compares the first current with a second reference current, and outputs a first level when the first current is greater than or equal to the second reference current and the pulse capture circuit obtains a second time of the second driving signal, and the conversion circuit collects a second voltage of the bus of the inverter circuit; the processor obtains the first inductance and the first resistance according to the first voltage, the second voltage, the first reference current, the second reference current, the first time and the second time. The detection time can be shortened, and the detection efficiency is improved.

The present application belongs to the technical field of inductance detection, and particularly relates to a magnetic core inductance testing machine and a detection method thereof, which comprises a beaker, a magnetic core, a temperature raising assembly, a thermometer, a capacitance inductance tester and a support. The beaker is placed on the heat transfer surface of the temperature raising assembly. The magnetic core is bound with a copper wire. The capacitance inductance tester is connected with the copper wire through a terminal. The beaker is filled with water and ice cubes. The mercury end of the thermometer is immersed in the solution in the beaker. The support comprises a base, a vertical rod, a horizontal rod one and a horizontal rod two. The vertical rod is fixedly connected with the base. The horizontal rod one and the horizontal rod two are movably connected with the vertical rod through an adjusting mechanism. The horizontal rod one is wrapped with insulating tape. The copper wire is hung on the insulating tape. The horizontal rod two is fixedly connected with a hook. The thermometer is hung on the hook through a bandage. The present application has the beneficial effect of adding the adjusting mechanism to improve the accuracy of the test data.