scholarly journals IMPROVEMENT OF CHARACTERISTICS OF THE WIDE-PULSE INVERTER WHEN WORKING FOR ASYNCHRONOUS LOAD

2018 ◽  
Vol 1 (12) ◽  
pp. 8-12
Author(s):  
Grigoriy Arsent'ev
Keyword(s):  
Pulse Width ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Output Current ◽  
Dc Voltage ◽  
Mode Of Operation ◽  
Output Characteristics ◽  
The Relationship

ь частоты, моделирование. Abstract. The urgency of the problem of studying the operation of inverters in the frequency Converter is shown. The characteristics of the pulse-width inverter when working on an asynchronous load are obtained. According to the results of research, conclusions are made to determine the relationship between the form of output current and current in the DC voltage link and the mode of operation of the asynchronous motor. It is determined that the inverter has the greatest influence on the internal and output characteristics of the frequency Converter. the Converter has an inverter.

scholarly journals The experience of creating an asynchronous motor control system for the hydraulic drive of a crane-manipulator

2018 ◽  
pp. 52-66
Author(s):  
I. V. Shestakov ◽  
N. R. Safin
Keyword(s):  
Motor Control ◽  
Control System ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Hydraulic Drive ◽  
Voltage Source ◽  
Motor Control System ◽  
Output Characteristics

The study introduces a mathematical model of an asynchronous motor control system for a hydraulic drive of a crane-manipulator, the model being implemented in the Matlab Simulink package. The choice of the frequency of the pulse-width modulation and the components of the controlled electric drive depends on the load diagram and the characteristics of a new electric motor. The paper emphasizes some features of this choice and also demonstrates the output characteristics of the motor powered by a sinusoidal voltage source and a frequency converter, which is a source of modulated pulse-width voltage

scholarly journals EQUIVALENTS OF THE PASSIVE EIGHT-EARTH POLAR WITH THREE INPUT AND FIVE OUTPUT CONCLUSIONS

2019 ◽  
Vol 20 (9-10) ◽  
pp. 109-119
Author(s):  
G. A. Bolshanyn
Keyword(s):  
Electrical Energy ◽  
Input Voltage ◽  
Individual Case ◽  
Output Current ◽  
Current Output ◽  
Input And Output ◽  
Voltage Output ◽  
The Difference ◽  
Output Characteristics ◽  
The Relationship

Eight-poles of various designs, including an eight-terminal network with three input and five output terminals, are needed to replace some power objects. Especially when only the input and output characteristics of electrical energy are of interest. The paper presents the eightterminal network equations with three input and five output terminals, establishing a connection between these characteristics. Equations of the A-form establish a connection between the input and output voltages and currents; the B-form equations establish a connection between the output and input voltages and currents; G-form equations establish a connection between the input current, output voltages and output voltage, output currents; H-form equations establish the relationship between the input voltage, output currents and output current, output voltages; the Yform equations establish a connection between the input and output currents and the input and output voltages; The Z-form equations establish the relationship between the input and output voltages and the input and output currents. When implementing these equations, attention should be paid to the difference in the directions of the currents in each individual case.

Pulse-Width Modulated Amplifier for DC Servo System and Its Matlab Simulation

2015 ◽  
Vol 9 (1) ◽  
pp. 625-631
Author(s):  
Ma Xiaocheng ◽  
Zhang Haotian ◽  
Cheng Yiqing ◽  
Zhu Lina ◽  
Wu Dan
Keyword(s):  
Mathematical Model ◽  
Transfer Function ◽  
Input Signal ◽  
Pulse Width ◽  
Rotation Speed ◽  
Servo Motor ◽  
Matlab Simulation ◽  
Pulse Width Modulated ◽  
Signal Changes ◽  
The Relationship

This paper introduces a mathematical model for Pulse-Width Modulated Amplifier for DC Servo Motor. The relationship between pulse-width modulated (PWM) signal and reference rotation speed is specified, and a general model of motor represented by transfer function is also put forward. When the input signal changes, the rotation speed of the servo motor will change accordingly. By changing zeros and poles, transient performance of this system is discussed in detail, and optimal ranges of the parameters is recommended at the end of discussion.

scholarly journals Comparative Study of Thyristor vs IGBT Based AC-DC Power Converter

2018 ◽  
Vol 17 (3) ◽  
pp. 89-102
Author(s):  
Md. Saiful Islam ◽  
Md. Rifat-Ul-Karim Shovon ◽  
Abdul Goffar Khan
Keyword(s):  
Comparative Study ◽  
Pulse Width ◽  
Output Voltage ◽  
Harmonic Distortion ◽  
Power Converter ◽  
Wave Shape ◽  
Average Output ◽  
Dc Power ◽  
Voltage Wave ◽  
The Relationship

This paper presents a comparative study of the application of Thyristor versus IGBT in AC-DC controlled power converter. Both simulation and practical experiment have been carried out to test the relationship between the average output voltage (Vdc) with firing angle (α, for Thyristor) and triggering pulse width (, for IGBT). Also the total harmonic distortion (THD) has been observed in both the cases. It is observed that IGBT based power converter introduces more harmonics in the system, in spite of more symmetrical output voltage wave shape.

scholarly journals All-fiber passively Q-switched ytterbium doped double-clad fiber lasers: experiment And modeling.

2021 ◽  
Author(s):  
Yi Lu
Keyword(s):  
Pulse Energy ◽  
Traveling Wave ◽  
Pulse Width ◽  
Fiber Lasers ◽  
Peak Power ◽  
Wave Model ◽  
Core Size ◽  
The Core ◽  
Q Switching ◽  
Output Characteristics

All-fiber passively Q-switched lasers were demonstrated using ytterbium-doped double cladding fiber (YDF) as an active medium. The laser was pumped by three 25W, 975nm fiber coupled diodes and Q-switching was initiated when the amplified spontaneous emission generated in the core of the gain fiber bleached the saturable absorber (SA). A piece of samarium-doped fiber was used as SA in first configuration and pulses with 68μJ pulse energy and 210ns pulse width were obtained. In second configuration, a piece of ytterbium-doped fiber with much smaller core size was used as SA to produce pulse energy of 86μJ. The last configuration incorporated a 9m-long YDF as gain fiber. The far end from pump was acting as SA in this case and pulses with 82μJ pulse energy and 148ns pulse width were observed. The peak power was estimated at 554W. Traveling wave model was implemented to numerically simulate the output characteristics versus pump power.

scholarly journals Modeling and analysis of vector control systems for asynchronous motor

2020 ◽  
Vol 178 ◽  
pp. 01001 ◽  
Author(s):  
Viktor Meshcheryakov ◽  
Tatyana Sinyukova ◽  
Alexey Sinyukov ◽  
Andrei Boikov ◽  
Rustem Mukhametzhanov
Keyword(s):  
Vector Control ◽  
Control Systems ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Asynchronous Motor ◽  
Evaluation Criteria ◽  
Torque Ripple ◽  
Modulation Method ◽  
Asynchronous Electric Drive ◽  
Vector Systems

The study aims at the analysis of vector control asynchronous electric drive systems. For comparison and evaluation, mathematical models of systems are implemented in the environment of simulation modeling Matlab Simulink. The evaluation criteria selected were: complexity of implementation, energy efficiency of the inverter, accuracy of speed maintenance, torque ripple, reaction speed of the system to disturbances from the side of the drive mechanism, impact on the supply network. Vector control systems by ensuring the maintenance of accuracy of the moment in the entire range of speed control are more widespread. The study of vector systems, the formation of the stator voltage vector in which is carried out using pulse-width modulation. The signal organization during the study was carried out by several methods. At the initial stage, the signal was formed due to relay-vector control in a closed loop for monitoring the instantaneous values of current errors without forced modulation; at the next stage of the study, the signal was generated using sinusoidal pulse-width modulation based on a comparison of control signals with some reference vector, the final stage became a spatial-vector modulation method.

scholarly journals A Frequency Locking Method for ICPT System Based on LCC/S Compensation Topology

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2626
Author(s):  
Yansong Li ◽  
Minhao Wang ◽  
Weiwei Zhang ◽  
Mengmeng Zhao ◽  
Jun Liu
Keyword(s):  
Output Power ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Maximum Efficiency ◽  
Initial Value ◽  
Frequency Locking ◽  
Inductively Coupled ◽  
Output Characteristics ◽  
The Relationship

Aiming to maximize the transmission efficiency of inductively coupled power transmission (ICPT) system with the designed output power, a frequency locking method for an ICPT system based on LCC/S compensation topology is proposed in this paper. Firstly, the relationship between compensation component Lf1 and output power was deduced by the lossless model, and the initial value of Lf1 was obtained. Then, considering the system loss, the designed output power and frequency were input into the frequency locking program, and Lf1 and other compensation parameters were dynamically tracked. At the same time, the transmission efficiency of the system was calculated, and the frequency that achieved maximum efficiency was automatically locked when the system met the requirements of the designed output power. Finally, based on the method, the output characteristics of the system were verified by experiments.

Analysis of Stress-Induced Birefringence in Nd:YAG Crystal

2007 ◽  
Vol 329 ◽  
pp. 557-562
Author(s):  
Hiroshi Matsuura ◽  
Yasuhiro Kunieda ◽  
Nobuhito Yoshihara ◽  
Tsunemoto Kuriyagawa
Keyword(s):  
Pulse Width ◽  
Continuous Wave ◽  
Extinction Ratio ◽  
Average Power ◽  
Elliptical Polarization ◽  
Laser Efficiency ◽  
Output Wavelength ◽  
Laser Dressing ◽  
The Relationship ◽  
Nd:Yag Crystal

A Nd:YAG crystal having a special structure achieved laser operation with an extinction ratio of over 20 dB, a CW (continuous wave) average power of 6 W, a pulse width of 50 ns, and repetition rates in the range 1 kHz – 10 kHz for an output wavelength of 1064 nm for effectively cooling the crystal for the case of laser dressing. The birefringence induced by the stress applied to the crystal results in the production of elliptical polarization before the Brewster-window and thus decreases the laser efficiency. In this paper, we analyzed the relationship between the distortion and the birefringence in a Nd:YAG crystal and the resulting effect on the laser power.

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