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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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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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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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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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Novel variable voltage variable frequency electric drive
Large Engineering Systems Conference on Power Engineering, 2003, 2003This paper provides a detailed description of the steady state performance of this system, based on a standard gas turbine prime mover. Economic considerations are discussed, as is dynamic performance and speed regulation. This topology would provide a definite advantage in reducing the amount of power electronic converter requirements, and eliminating
T.H. Ortmeyer +3 more
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Experience with variable frequency drives and motor bearing reliability
Record of Conference Papers. IEEE Industry Applications Society 45th Annual Petroleum and Chemical Industry Conference (Cat. No.98CH36234), 2001Motor bearing life historically has been difficult to predict. Many variables influence bearing life in motors including operating speed, mechanical fit, loading, lubrication, vibration and environmental conditions. A large synthetic fibers producer recently discovered that motor shaft voltage induced by variable frequency drives (VFD) can add another ...
S. Bell +6 more
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Chapter 18: Variable Frequency Drive Evaluation Protocol
2014An adjustable-speed drive (ASD) includes all devices that vary the speed of a rotating load, including those that vary the motor speed and linkage devices that allow constant motor speed while varying the load speed. The Variable Frequency Drive Evaluation Protocol presented here addresses evaluation issues for variable-frequency drives (VFDs ...
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Variable Frequency Drives for Commercial Laundry Machines
IEEE Industry Applications Magazine, 1997Variable-speed AC drives have a well-founded reputation for versatility and dependability, with many features and benefits that are just not available from other drive technologies. They are presently used in applications ranging from simple fan control to complex operations including process loops, positioning and indexing, and industrial laundry ...
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Variable Frequency Permanent Magnet AC Machine Drives
2009This chapter contains sections titled: Introduction PMAC Machine Control Fundamentals Trapezoidal PMAC Machine Control Sinusoidal PMAC Machine Control Advanced Control Techniques PMAC Drive Application Issues Conclusion This chapter contains sections titled: References ]]>
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