摘要 :
A new type of inverter motor, which can work under both AC-AC and AC-DC-AC model, is introduced in this paper. The characteristics of small thyristor number and convenient control theme are much better than the traditional converter.
摘要 :
A new type of inverter motor, which can work under both AC-AC and AC-DC-AC model, is introduced in this paper. The characteristics of small thyristor number and convenient control theme are much better than the traditional converter.
摘要 :
In this paper the analysis of two vector control types for a three-phase AC-AC converter is carried out. A control algorithm is proposed and a sinusoidal waveform of an output voltage and input current is obtained.
摘要 :
In this paper the analysis of two vector control types for a three-phase AC-AC converter is carried out. A control algorithm is proposed and a sinusoidal waveform of an output voltage and input current is obtained.
摘要 :
In this paper the analysis of two vector control types for a three-phase AC-AC converter is carried out. A control algorithm is proposed and a sinusoidal waveform of an output voltage and input current is obtained.
摘要 :
Researches in the field of AC induced corrosion have been a concern for about 30 years
and still there is little knowledge on the mechanisms involved. This investigation deals
with the corrosion behaviour of mild steel in natura...
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Researches in the field of AC induced corrosion have been a concern for about 30 years
and still there is little knowledge on the mechanisms involved. This investigation deals
with the corrosion behaviour of mild steel in natural seawater and in sodium chloride
medium subjected to induced AC, DC and superimposed (AC+DC). Attempt has also
been made to identify where and when AC corrosion is taking place depending upon the
corrosion current (icorr) and elucidates the possible mechanism underlying AC corrosion
under laboratory condition.
Polarization studies were carried out for mild steel in natural seawater and in 18500
ppm NaCl solutions to evolve corrosion current and then various source current values
were derived from the DC polarization curves. Initially, the influence of individual AC
and DC field on the corrosion of mild steel in both the media was carried out and then
system has been set up to measure superimposition of AC and DC effect. The effect of
changes in the solution pH, surface morphology and the extent of Fe leaching to the
solution under the influence of AC, DC and the superimposition of (AC+DC) were
studied in detail.
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摘要 :
Researches in the field of AC induced corrosion have been a concern for about 30 years and still there is little knowledge on the mechanisms involved. This investigation deals with the corrosion behaviour of mild steel in natural ...
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Researches in the field of AC induced corrosion have been a concern for about 30 years and still there is little knowledge on the mechanisms involved. This investigation deals with the corrosion behaviour of mild steel in natural seawater and in sodium chloride medium subjected to induced AC, DC and superimposed (AC+DC). Attempt has also been made to identify where and when AC corrosion is taking place depending upon the corrosion current (icorr) and elucidates the possible mechanism underlying AC corrosion under laboratory condition. Polarization studies were carried out for mild steel in natural seawater and in 18500 ppm NaCl solutions to evolve corrosion current and then various source current values were derived from the DC polarization curves. Initially, the influence of individual AC and DC field on the corrosion of mild steel in both the media was carried out and then system has been set up to measure superimposition of AC and DC effect. The effect of changes in the solution pH, surface morphology and the extent of Fe leaching to the solution under the influence of AC, DC and the superimposition of (AC+DC) were studied in detail.
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摘要 :
For traditional linear Stirling Cryocoolers, the amplitude of output sinusoidal AC voltage is modulated mainly by Modulation ratio (M) controlled by the inverter, so that the compression piston is driven to perform linear reciproc...
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For traditional linear Stirling Cryocoolers, the amplitude of output sinusoidal AC voltage is modulated mainly by Modulation ratio (M) controlled by the inverter, so that the compression piston is driven to perform linear reciprocating motion and the compressed refrigerant expands rapidly in the expander to achieve the purpose of refrigeration. In practice, however, when M is used to modulate the amplitude of sinusoidal AC voltage, the input power and current will increase to a certain extent with the decreased M. To address the aforementioned concern, the correlated characteristics of output voltage of the inverter under the M and vector phase shift modes will be compared and analyzed in this paper for the selection of best driving mode for linear Stirling cryocoolers. Although the experiments reveal a small difference of sinusoidal voltage amplitude of the two modes under the same input voltage, and a basically same energy distribution of waveform at the fundamental frequency and other frequency multiplications, the required power and current are more stable and do not increase with the decreased output voltage amplitude in the mode of vector phase shift.
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摘要 :
In this paper, for improving battery performance and exactly analyzing the characteristics of battery pack, a bidirectional DC power supply for superposing high frequency sinusoidal current with several hundred DC current is devel...
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In this paper, for improving battery performance and exactly analyzing the characteristics of battery pack, a bidirectional DC power supply for superposing high frequency sinusoidal current with several hundred DC current is developed. In this product, the design method of output inductance and high speed control is proposed. The output inductance is determined by the output current ripple and the AC voltage drop on inductor. The high speed current control method is designed for generating and regulating a 20kHz sinusoidal current superposed with maximum DC 350A. The validity of proposed method is verified by experiment. Using this method, a 20kHz/100App (pp: peak to peak) sinusoidal current superposed with several hundred DC current can be regulated instantaneously at 600kHz control frequency to charge and discharge the battery pack.
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摘要 :
In this paper, for improving battery performance and exactly analyzing the characteristics of battery pack, a bidirectional DC power supply for superposing high frequency sinusoidal current with several hundred DC current is devel...
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In this paper, for improving battery performance and exactly analyzing the characteristics of battery pack, a bidirectional DC power supply for superposing high frequency sinusoidal current with several hundred DC current is developed. In this product, the design method of output inductance and high speed control is proposed. The output inductance is determined by the output current ripple and the AC voltage drop on inductor. The high speed current control method is designed for generating and regulating a 20kHz sinusoidal current superposed with maximum DC 350A. The validity of proposed method is verified by experiment. Using this method, a 20kHz/100App (pp: peak to peak) sinusoidal current superposed with several hundred DC current can be regulated instantaneously at 600kHz control frequency to charge and discharge the battery pack.
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