Results 261 to 270 of about 1,417,989 (292)
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Formation of Starting Torque of Double-Fed Induction Motor
2020 IEEE Problems of Automated Electrodrive. Theory and Practice (PAEP), 2020The article deals with studying the way of determining the supply voltage parameters for induction motor with frequency control in the rotor circle under the conditions of the hard start. The method of experiment planning results in the regression model of the frequency in the power net and the angle of mismatch of electromagnetic fields of the stator ...
Oksana Khrebtova +4 more
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Applying Adjustable Frequency Controllers to High-Starting-Torque Loads
IEEE Transactions on Industry Applications, 1995Effectively applying adjustable frequency controllers (AFCs) to high-starting-torque loads present challenges to the application engineer. A detailed understanding of AFC operation is essential. The authors use a recent experience to review the essential system concepts and outline a practical method to minimize potential pitfalls and facilitate ...
K.S. Crawford +3 more
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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
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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
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Direct torque control of induction motor soft starting
2009 Brazilian Power Electronics Conference, 2009This paper presents a simple technique based on stator flux estimation to control the electromagnetic torque of induction motors during soft starting. The inherent problems related to pure integration of the back electromagnetic force to estimate the stator flux are minimized using the low pass filter approach.
Jose de Oliveira +3 more
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Handling high torque starts in new and retrofit applications
2017 IEEE-IAS/PCA Cement Industry Technical Conference, 2017Many applications have a higher starting torque requirement and it is sometimes a struggle to provide smooth starting performance. VFD starts are known to reduce starting stresses but may not always provide the best overall solution when economics, performance and process control are considered.
J George Seggewiss, Carlos Siri
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Torque Oscillations of Synchronous Motors Under Starting Conditions
IEEE Transactions on Industry Applications, 1987Salient-pole synchronous motors develop an average torque and a twice-slip frequency oscillating torque during starting. If coupled to a complex mechanical system, with resonance in the oscillatory frequency range, severe stresses may result in shafts, gears, and couplings.
Jaime De La Ree Lopez +1 more
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Condenser Motor with High Starting Torque and Low Capacitance
1928The theory of the condenser motor is the operation of a poly-phase motor on a single-phase source. If we consider the current in one phase of a two-phase motor the IR drop is in phase with the current I and the reactance drop is at right angles to it. The voltage OB across the phase is the vector sum of these two.
Hoover, Vaino Alexander +1 more
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AIRCRAFT ACCESSORY DRAG TORQUE DURING ENGINE STARTS
2017<div class="section abstract"> <div class="htmlview paragraph">This SAE Aerospace Information Report (AIR) presents a discussion of drag torques of engine accessories operating at cold temperature. Various conditions of temperature, speed, and acceleration rates are reviewed showing the merits of each method and recommending a standard ...
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Engine Starting Torque Evaluation through Starter Motor
SAE Technical Paper Series, 2011<div class="section abstract"><div class="htmlview paragraph">Engine starting torque requirement at extreme cold and hot conditions is not possible to evaluate by transient dynamometer. Due to this, starting system design may not meet the engine starting requirements under all operating environments.</div><div class="htmlview ...
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Influence of Rheological Properties on the Starting Torque of Magnetic Fluid Seal
IEEE Transactions on Magnetics, 2021Yanhong Cheng, Zhenkun Li, Decai Li
exaly