Results 261 to 270 of about 9,397,444 (297)

Current starting position for the development of the Russian economy

National Interests: Priorities and Security, 2022
Subject. The article considers the impact of sanctions on various sectors of the Russian economy. Objectives. The focus is on the analysis of risks of the Russian economy destabilization. Methods. The study employs methods of statistical, neural network, and cluster analysis. Results.
openaire   +1 more source

Suppression of Starting Current of a High-Current Low-Pass Filter

IEEE Transactions on Industrial Electronics and Control Instrumentation, 1974
The input high-current low-pass filter of a power conversion equipment usually has high starting current. This paper demonstrates how with the help of a resistor (R) and a Zenerdiode (Uz) one can suppress the starting current. Optimal values of these components are calculated and verified by an experiment.
openaire   +1 more source

Motor starting currents as affecting large transmission systems

Proceedings of the American Institute of Electrical Engineers, 1912
From time to time those responsible for the operation of electrical systems have displayed a disposition to place a definite limit upon the size of motors which they will allow upon their circuits. This tendency seems to be more pronounced in alternating-current than in direct-current systems, but is observable in both. Moreover, in alternating-current
openaire   +1 more source

Creating a culture of philanthropy starts with current students

Journal of Education Advancement & Marketing, 2016
In an effort to nurture future fundraising success, higher education institutions are refocusing their advancement efforts on educating current students about the importance and impact of philanthropy. Creating a culture of philanthropy starts with financial resources, campus collaborations and engaging current students. Student philanthropy engagement
Jeri Patricia Gabbert, Leeann Z. Wright
openaire   +1 more source

Electric current jump-starts diamine synthesis

C&EN Global Enterprise, 2017
To make vicinal diamines, in which neighboring carbons each have an attached amine group, chemists generally expose alkenes to harsh chemical oxidants, which can produce environmentally toxic by-products. Now, researchers have replaced those harsh reactants with a metal catalyst and some electric current to create a safer and less wasteful synthetic ...
openaire   +1 more source

Current ripple reduction of aircraft start generators in the starting mode with variable switching frequency method

IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society, 2017
This paper proposes a method of variable switching frequency pulse-width-modulation (PWM) to suppress current ripple when aircraft start generator (SG) operates in the starting mode. Compared with the widely used constant switching frequency PWM, the method can work evidently, especially in the range of low speed. Based on analysis of dead-time effects
Hejie Li, Zhihui Chen, Jincai Li, Zhuoran Zhang 0002   +3 more
openaire   +1 more source

Reduced Starting Current For Single Phase Capacitor Induction Motors While Maintaining Starting Torque

2019 IEEE AFRICON, 2019
Single phase induction motors typically require 7 times their rated current to provide the necessary starting torque. This provides a challenge in weak electrical systems. The work presented in this paper illustrates that starting a refrigerator compressor motor from a non-zero frequency supply with v/f ratio changing and a suitable ramp time a ...
Edwin Tebogo Ribisi, Peter Freere
openaire   +2 more sources

Starting transient current of induction motors without and with terminal capacitors

IEEE Transactions on Energy Conversion, 1991
A simplified time-domain analysis based on equivalent circuit, differential equations, and the Laplace transformation is presented for the calculation of the starting current of an induction motor without and with terminal capacitors. The solution is realized by the superposition of natural and forced responses of the starting current components ...
R. Natarajan, V.K. Misra
openaire   +1 more source

Inverter motor with sinusoidal starting currents ‐ a survey

European Transactions on Electrical Power, 1994
AbstractInverter motors need only simple line‐ and machine‐commutated converters and have proved good performance for drives in the MW range. They cause high torque ripple, which is disturbing only at low frequencies, and require additional commutation devices under heavy start‐up conditions.
openaire   +1 more source

Fits and Starts: A Current Look at Marine and Industrial Gas Turbine Electric Start Systems

Volume 1: Aircraft Engine; Fans and Blowers; Marine; Honors and Awards, 2017
Electric starter development programs have been the subject of ASME technical papers for over two decades. Offering significant advantages over hydraulic or pneumatic starters, electric starters are now poised to be the preferred choice amongst gas turbine customers.
openaire   +1 more source