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STX13003
STX13003

... Figure 10. Inductive load switching time Figure 11. Resistive load switching time ...
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... The multiplier usually consists of 22 to 30 capacitors and diodes (the sketch above has been simplified) and the capacitors are rated for about 630V DC, although most mains suppression capacitors rated for 275V AC seem to work just fine. The diodes are generally IN4007's which are standard 1A diodes ...
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... In recent years, there has been an increase in the use of renewable energy due to growing concern for the shortage of conventional energy resources and environment pollution. With the rapid progress of the power electronic techniques, solar energy as an alternative energy source has been put to use ...
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... Rated capacity of each unit: kW kVA If unit outputs are different, please fill in additional sheets to provide the information. Rated frequency: Hz Rotating Machine Type: Synchronous Induction Other (Please Specify) Generator connecting on: single phase three phases Limits of range of reactive power ...
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... application of motors today. In the past, the National Electric Code (NEC) permitted a maximum instantaneous trip current at 13 times the full load rated current. This is a very misleading setting. A typical motor with 650% locked rotor current (LRA) will have a peak instantaneous current of 6.5 tim ...
Serway_PSE_quick_ch33
Serway_PSE_quick_ch33

< 1 ... 977 978 979 980 981 982 983 984 985 ... 1315 >

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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