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Power Factor in Electrical Energy Management
Power Factor in Electrical Energy Management

... From the above list, we can see that a low power factor can be a result of the design of the equipment, as in the case of welders, or it can be result from the operating conditions under which the equipment is used, as in lightly loaded induction motors which are probably the worst offenders. Equipm ...
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... Power-Gating Single-Rail MOS Current-Mode Logic Circuits Using HighThreshold PMOS Transistors as Linear Resistors Ruiping Cao, Jianping Hu* and Xuecheng Xiang Faculty of Information Science and Technology, Ningbo University, Ningbo, 315211, China Abstract: In this paper, a power-gating technology fo ...
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... shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability th ...
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Variable-frequency drive



A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.VFDs are used in applications ranging from small appliances to the largest of mine mill drives and compressors. However, around 25% of the world's electrical energy is consumed by electric motors in industrial applications, which are especially conducive for energy savings using VFDs in centrifugal load service, and VFDs' global market penetration for all applications is still relatively small. That lack of penetration highlights significant energy efficiency improvement opportunities for retrofitted and new VFD installations.Over the last four decades, power electronics technology has reduced VFD cost and size and has improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.VFDs are available in a number of different low- and medium-voltage AC-AC and DC-AC topologies.
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