Results 291 to 300 of about 1,319,354 (354)
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A Novel Four-in-One Variable Frequency Drive Topology
IEEE transactions on industry applications, 2019Of late, most types of ac motors can be operated using variable frequency drives (VFDs) by merely selecting the type of motor and the corresponding control method using a sophisticated all-in-one software platform.
M. Swamy
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Mechanical Vibration Problems With Variable Frequency Drives
Volume 2: Integrity and Corrosion; Offshore Issues; Pipeline Automation and Measurement; Rotating Equipment, 2000Variable frequency drives are now frequently used to power large horsepower pipeline pumps to eliminate power costs wasted by throttling, to reduce inrush current on motor start, and to provide greater operating flexibility. This variable speed operation, however, can cause vibration problems in the pump and motor bearings, and in the couplings that ...
Ralph Dickau, Lal Perera
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Variable‐Frequency Drives Streamline Emergency Applications
Opflow, 2009This article discusses a variable‐frequency drive (VFD) generator that matches pump motor speed with flow or demand to save energy and reduce stress on rotating components. The article discusses how a VFD can control motor speed by changing the frequency that affects the pumping rate, along with affinity laws for centrifugal pumps, relationships ...
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European Conference on Cognitive Ergonomics, 2018
It is well understood that variable frequency drives (VFDs) can cause overvoltage up to twice the DC bus voltage (2 pu, where 1 per unit is the DC bus voltage) at the machine winding terminals, especially if long power cables are used and/or fast rise ...
Han Xiong, Julia Zhang, A. von Jouanne
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It is well understood that variable frequency drives (VFDs) can cause overvoltage up to twice the DC bus voltage (2 pu, where 1 per unit is the DC bus voltage) at the machine winding terminals, especially if long power cables are used and/or fast rise ...
Han Xiong, Julia Zhang, A. von Jouanne
semanticscholar +1 more source
Variable Frequency Synchronous Motor Drives
1985The speed of a synchronous motor with constant rotor excitation is determined by the stator frequency and the number of poles. As long as an efficient, variable frequency power supply was not available this meant constant speed operation at fixed frequency.
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Variable frequency drives and encoder systems
2020Variable frequency drives (VFDs) and rotary encoders have become indispensable in modern conveyor technology.
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European Conference on Cognitive Ergonomics, 2018
Silicon carbide (SiC) metal oxide semiconductor field effect transistor (MOSFET) power module is the next generation switching device for the medium voltage (MV) variable frequency drive (VFD). This paper investigates two problems which compromise system
Hanning Tang, A. Huang
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Silicon carbide (SiC) metal oxide semiconductor field effect transistor (MOSFET) power module is the next generation switching device for the medium voltage (MV) variable frequency drive (VFD). This paper investigates two problems which compromise system
Hanning Tang, A. Huang
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Starting torque of variable frequency electric drive
2017 International Conference on Modern Electrical and Energy Systems (MEES), 2017The thesis deals with analyzing modes of the induction motor breakaway in the system “frequency changer — induction motor”. The authors establish that the stator winding heating occurs slower when forming the cyclic starting moment compared to the heating in the prolonged operating mode of the induction motor with the stalled rotor that allows doing ...
Serhii Serhiienko, Oksana Khrebtova
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Journal of Engineering For Gas Turbines and Power, 2017
Electrically assisted engine boosting systems lend themselves to better throttle response, wider effective operating ranges, and can provide the ability to extract excess energy during deceleration and high-load events (and store it in a vehicle's ...
A. Carpenter +3 more
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Electrically assisted engine boosting systems lend themselves to better throttle response, wider effective operating ranges, and can provide the ability to extract excess energy during deceleration and high-load events (and store it in a vehicle's ...
A. Carpenter +3 more
semanticscholar +1 more source
Power Line Considerations for Variable Frequency Drives
IEEE Transactions on Industry Applications, 1985More frequent use of variable frequency drives requires that the interaction between the drives and the power line be considered in order to avoid undesirable power line effects caused by the drive. In addition, the power line characteristics need to be defined by the drive manufacturer which assure proper operation of the variable frequency drive. The
Dennis A. Jarc, Robert G. Schieman
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