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MEASUREMENTS OF ELECTRICAL QUANTITIES
MEASUREMENTS OF ELECTRICAL QUANTITIES

massachusettsinstitut eoftechnology department of electrical
massachusettsinstitut eoftechnology department of electrical

... The first line is a comment. The second line is a control statement that directs JSim to include a netlist file containing the mosfet model parameters for the manufacturing process we’ll be targeting this semester. The next three lines specify three voltage sources; each voltage source specifies the ...
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NOVA Family of Products
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... polymer and vacuum technologies to increase value for distribution systems. Cooper has combined solid cycloaliphatic-epoxy polymer-encapsulated vacuum interrupters with a reliable, lightweight operating mechanism that utilizes a magnetic actuator to provide a lifetime of trouble-free operation. This ...
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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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