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01042
01042

... Controls and VACop Operators Operator control functions include automatic transfer, automatic fault interruption, a combination automatic transfer and fault isolation, and remote control switching. Switching can be accomplished manually, automatically or remotely from the VACpac switch. Available co ...
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... loss substrate defines each mode Q-factor: the lower the losses, the better the quality factor. Here, sapphire is selected for its excellent properties in the microwave frequency range20 . The resonance frequency fp of the piezoelectric film fundamental mode is fixed by the ratio cp /tp with cp the ...
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... indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more U ...
A.D. Sagneri, D.I. Anderson, and D.J. Perreault, “Optimization of Integrated Transistors for Very High Frequency dc-dc Converters,” IEEE Transactions on Power Electronics , Vol. 28, No. 7, pp. 3614-3626, July 2013.
A.D. Sagneri, D.I. Anderson, and D.J. Perreault, “Optimization of Integrated Transistors for Very High Frequency dc-dc Converters,” IEEE Transactions on Power Electronics , Vol. 28, No. 7, pp. 3614-3626, July 2013.

... icond,RM S , is independent of frequency as is the on-state resistance, RDS−on . Therefore, even as frequency is scaled into the VHF regime, conduction loss remains significant and sets the minimum device area necessary to process a given amount of power. In contrast to conduction loss, the frequenc ...
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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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