Results 251 to 260 of about 9,397,444 (297)

Saturistors and low starting current induction motors

Electrical Engineering, 1962
By the use of a hard magnetic material, such as alnico, in the leakage-flux paths of the secondary circuits of an induction motor, a remarkably high locked-rotor torque per ampere can be obtained without the sacrifice of full-load speed.
P. Alger, G. Angst, W. Schweder
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Gyrotron Operation in the ‘No-Start-Current’ Zone

2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2018
It is conventionally assumed that the gyrotrons can operate either in the regime of soft self-excitation, where the beam current exceeds the start current, or in the regime of hard excitation, where the beam current is lower than the start current. The authors have found one more possibility of gyrotron operation: in the region where there is no start ...
Olgierd Dumbrajs, Gregory S. Nusinovich
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Starting currents in coaxial gyro-BWO

13th International Crimean Conference Microwave and Telecommunication Technology, 2003. CriMiCo 2003., 2003
In this paper, we conducted theoretical investigation of coaxial BWO, operating at resonance of relativistic electron beam (REB) with back wave on the normal Doppler effect (gyro-BWO). Linear theory of exciting process is presented. The dependence of starting current values upon the coaxial waveguide length and the electron beam energy is investigated.
A. Borodkin, V. Khoruzhiy, I. Onishchenko, G. Sotnikov   +3 more
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Computation of Start Oscillation Current in a gyrotron

2008 International Conference on Recent Advances in Microwave Theory and Applications, 2008
Gyrotron is a high power microwave device intensively developed for heating of plasma in thermonuclear fusion research. The relativistic gyrating electron beam interacts with transverse electric (TE) wave near cutoff in a uniform section of tapered cavity resonator at a DC magnetic field helps to excite several modes simultaneously.
H. Khatun, R.R. Rao, A.K. Sinha, S.N. Joshi   +3 more
openaire   +1 more source

Analysis of Starting Characteristics of Direct-Current Motors

Transactions of the American Institute of Electrical Engineers, 1917
In this paper are derived the mathematical expressions for the current, speed, torque and power at any time during the accelerating period when a shunt, series or compound motor is connected to a supply line.
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Implementation of the direct torque control (DTC) in current model, with current starting limiter

CONIELECOMP 2012, 22nd International Conference on Electrical Communications and Computers, 2012
This paper presents the scheme of Direct Torque Control (DTC) for induction motor drives, where flux and torque of the motor are estimated by the IM current model. Its scheme requires the knowledge of speed, rotor time constant and inductive parameters of the motor.
Mino Aguilar, Gerardo, Muñoz Hernández, German Ardul, Romeral Martínez, José Luis, Cortez, Liliana, Saynes Torres, J.   +4 more
openaire   +3 more sources

Starting Currents in the Backward-Wave Oscillator

Journal of Applied Physics, 1953
The starting current of a simple model of the backward-wave oscillator described by Kompfner and Williams has been calculated. The effect of space charge is included. The starting current I0 may be written in the form I0=4V0Z0[a0(4QC)2πN]3,where V0 is the beam voltage, Z0 is the impedance of the circuit, N is the length of the oscillator in wave ...
openaire   +1 more source

An Automatic Constant Current Starting of Thyristor Controlled Direct Current Motor

IETE Journal of Research, 1973
With the development of large power thyristors, thyristor-controlled direct current motors are finding wide applications in almost all fields where precise speed control is necessary. Much work has been carried out on the speed control of such motors and also some work has been done on their automatic starting1–5.
D. P. Chakrabarty, S. K. Gupta, N. C. Goyal   +2 more
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Inverter motor with sinusoidal starting currents

[Proceedings] APEC '91: Sixth Annual Applied Power Electronics Conference and Exhibition, 2002
A power converter circuit for motor applications without substantial additional expenditure at the power circuit, with the exception of the DC link chokes, compared to the conventional inverter motor is presented. The circuit operates as a cycloconverter at start-up and low frequencies of the motor, and as a current source inverter at high speeds.
openaire   +1 more source

Soft starting simulation of direct-current motor

2011 International Conference on Electric Information and Control Engineering, 2011
For the limitations of direct starting and step starting of DC motor, a soft starting method is designed, and modeled the simulation models based on dynamic simulation software MATLAB/SIMULINK to separately excited DC motor, calculated and set the parameters, obtained the simulation results.
Feng Wang, null Zhou-Xing Fu
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