Design of a current transducer with a magnetic core for use in measurements of nanosecond current pulses

2006 ◽  
Vol 17 (4) ◽  
pp. 895-900 ◽  
Author(s):  
Q Zhang ◽  
J Zhu ◽  
J Jia ◽  
F Tao ◽  
L Yang
Keyword(s):  
Magnetic Core ◽  
Current Pulses ◽  
Current Transducer ◽  
A Current

scholarly journals Negative Corona Current Pulses and Cathode Sheath Instabilities in a Short Point-Plane Gap in CO2

1992 ◽  
Vol 45 (2) ◽  
pp. 193 ◽  
Author(s):  
M Cernák ◽  
T Hosokawa
Keyword(s):  
Complex Form ◽  
Leading Edge ◽  
Negative Corona ◽  
Cathode Sheath ◽  
Current Pulses ◽  
Corona Current ◽  
Pulse Peak ◽  
Pulse Formation ◽  
A Current ◽  
Gas Pressures

Waveforms ofthe first negative corona current pulses have been measured in C02 and C02+SF6 mixtures as a function of applied voltage and gas pressure in the range 6�67-66�7 kPa. A complex form of the pulses with a step on the pulse leading edge and a current hump on the pulse trailing part has been found at gas pressures below 40 kPa. Changing the cathode surface material from copper to copper iodide, which has an exceptionally high photoelectric yield, resulted in at least a twofold increase in height of the step on the pulse leading edge, but had little effect on the main current rise to the pulse peak. The use of unconditioned cathodes resulted in the appearance of peculiar current spikes on the pulse tail, which are tentatively attributed to positive-streamer-like instabilities of the cathode sheath. The implications of these results for theories of Trichel pulse formation are discussed, and a physical picture of the phenomenon based on the presumed existence of a cathode-directed streamer associated with the steep pulse rise is outlined.

scholarly journals Measurement of the PMSM Current with a Current Transducer with DSP and FPGA

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 209 ◽  
Author(s):  
Tomasz Rudnicki
Keyword(s):  
Digital Signal Processor ◽  
Full Range ◽  
Permanent Magnet Synchronous Motor ◽  
Digital Signal ◽  
Correction Method ◽  
Phase Current ◽  
Current Transducer ◽  
The Difference ◽  
Processor Unit ◽  
A Current

In the present work, two approaches for the phase current measurement of a permanent magnet synchronous motor (PMSM) were compared. The measured phase current was distorted by glitches, and a software method to eliminate these glitches was necessary. An averaging of samples was carried out, and the experimental results indicated that averaging was essential for further calculations. Moreover, the PMSM operated smoothly, and the difference between the set point and the actual speed was reduced for the full range of loads from the free run up to a full load. The increasing popularity of field-programmable gate array (FPGA) devices has encouraged developments in PMSM controllers using a direct hardware approach and the classic software approach utilizing a digital signal processor unit. In this study, the selected performance of TMS320F2812 and Spartan-3E were compared. This paper proposes an original adaptive correction method for a current transducer.

Design of a Rogowski Coil with a Magnetic Core Used for Measurements of Nanosecond Current Pulses

2006 ◽  
Vol 8 (4) ◽  
pp. 457-460 ◽  
Author(s):  
Zhu Jundong ◽  
Zhang Qiaogen ◽  
Jia Jiangbo ◽  
Tao Fengbo ◽  
Yang Liandian ◽  
...  
Keyword(s):  
Magnetic Core ◽  
Rogowski Coil ◽  
Current Pulses

scholarly journals Using a Current Shunt for the Purpose of High-Current Pulse Measurement

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1835
Author(s):  
Pawel Piekielny ◽  
Andrzej Waindok
Keyword(s):  
Mathematical Model ◽  
Power Supply ◽  
Rogowski Coil ◽  
High Current ◽  
Shunt Resistance ◽  
Software Comparison ◽  
Current Pulses ◽  
Measurement Results ◽  
The Mathematical Model ◽  
A Current

Measurement of high-current pulses is crucial in some special applications, e.g., electrodynamic accelerators (EA) and converters. In such cases, the current shunts have limitations concerning the frequency bandwidth. To overcome the problem, a method based on the shunt mathematical model is proposed. In the method, the solution of ordinary differential equations for the RL circuit is carried out in order to obtain the real current shape. To check the method, as a referee, a Rogowski coil dedicated to measuring high-current pulses was used. Additionally, the measurement results were compared with the mathematical model of the tested power supply system. Measurements were made for the short power supply circuit, which allows eliminating the nonlinearity. The calculations were carried out using a circuit model. In order to obtain the parameters of the shunt (resistance and inductance), it was modeled using an ANSYS/Q3D Extractor software. Comparison of calculation and measurement results confirms the correctness of our method. In order to compare results, the normalized root mean square error (NRMSE) was used.

scholarly journals Electric Current Waveform of the Injector as a Source of Diagnostic Information

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4151
Author(s):  
Krzysztof Więcławski ◽  
Jędrzej Mączak ◽  
Krzysztof Szczurowski
Keyword(s):  
Electric Current ◽  
Diagnostic Information ◽  
Diagnostic Methods ◽  
Fuel Injector ◽  
Current Waveform ◽  
Voltage Waveform ◽  
Current Voltage ◽  
Current Transducer ◽  
Method Of Evaluation ◽  
A Current

The article discusses the method of evaluation of the fuel injector operation based on the observation of the electric current parameters, which were measured with a current transducer using the Hall effect, during the dosing process. This method relies on comparison of the electric current-related values of the examined injector with the model characteristics, which are representing the properly functioning injector. A model of the fuel injector in the form of the electric current waveform that describes the changes in the electric current and voltage during its work is presented in this article. Complex equations describing the fuel injector model under discussion account for the characteristics of the current variations, with no damage-induced modifications. Due to these, the modeled electric current/voltage waveform mirrors the real conditions. The use of a mathematical model describing the voltage–current phenomena occurring during the injector operation allows determining the actual beginning and duration of the injection. The model can also be used to develop new injector diagnostic methods that can be implemented in the engine controller (ECU).

scholarly journals Application of pulse current for dissolution of heat-resistant GS32-VI alloy

2021 ◽  
Vol 16 (5) ◽  
pp. 438-447
Author(s):  
O. V. Chernyshova ◽  
T. B. Yelemessov ◽  
D. V. Drobot
Keyword(s):  
Dissolution Rate ◽  
Current Pulse ◽  
Pulse Duration ◽  
Reverse Current ◽  
Pulsed Current ◽  
Current Output ◽  
Heat Resistant ◽  
Current Pulses ◽  
Pulsed Mode ◽  
A Current

Objectives. To identify the regularities of electrochemical processing of the heat-resistant GS32-VI alloy in a sulfuric acid electrolyte with a concentration of 100 g/dm3 under the action of a pulsed current in a pulsed mode.Methods. Using the electrochemical technological complex EHK-1012 (developed by IP Tetran) and a non-compensatory method of measuring potential, polarization and depolarization curves with a change in pulse duration and a pause between them were recorded. The current pulses had an amplitude ranging from 0 to 3.5 A (when recording the polarization and depolarization curves), pulse durations ranging from 200 to 1200 ms, and a pause (delay) between pulses ranging from 50 to 500 ms. There were no reverse current pulses.Results. The parameters of the current program that provide the maximum values of the alloy dissolution rate and current output were determined: with a current pulse amplitude of 2 A, a current pulse duration of 500 ms, and a pause duration between pulses of 250 ms, the maximum dissolution rate of the alloy is 0.048 g/h·cm2, while the current output for nickel is 61.6% with an anode area of 10 cm2. The basic technological scheme for processing the heat-resistant GS32-VI alloy, which includes anodic alloy dissolution in a pulsed mode, is proposed.Conclusions. Electrochemical dissolution of GS32-VI alloy under pulsed current action results in an optimal dissolution rate ratio of the alloy components, ensuring the production of a cathode precipitate with a total nickel and cobalt content of 97.5%.

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