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The skin depth is the thickness at which the current density is reduced by 63%. Even at relatively low frequencies used for power transmission (50 Hz – 60 Hz), non-uniform distribution of current still occurs in sufficiently thick conductors. For example, the skin depth of a copper conductor is approximately 8.57 mm at 60 Hz, so high-current ...
Vacon NX frequency converter drives, also known as variable-frequency drives, were one of the two types of converters targeted by the Stuxnet Virus at the Iranian enrichment facility in Natanz, Iran. The worm would search a PLC for the specific identification number, in this case 9500h, that is assigned to the Vacon converter.
Small variable-frequency drive Chassis of above VFD (cover removed). A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, variable voltage variable frequency drive, or drive) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by varying the frequency of the ...
Scalar control of an AC electrical motor is a way to achieve the variable speed operation by manipulating the supply voltage or current ("magnitude") and the supply frequency while ignoring the magnetic field orientation inside the motor. [1]
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Non-uniform memory access (NUMA) is a computer memory design used in multiprocessing, where the memory access time depends on the memory location relative to the processor. Under NUMA, a processor can access its own local memory faster than non-local memory (memory local to another processor or memory shared between processors). [ 1 ]
In April 2022, Gamefam, with the partnership of Sega of America, released Sonic Speed Simulator on Roblox, which is a Sonic the Hedgehog game. [13] Its launch was the largest on Roblox, with 70 million plays [14] and 275,000 concurrent players in the first week of its release, and it would reach 500 million visits in its first four months. Joe ...
A variable-speed drive (VSD) air compressor is an air compressor that takes advantage of variable-speed drive technology. This type of compressor uses a special drive to control the speed ( RPM ) of the unit, which in turn saves energy compared to a fixed speed equivalent. [ 1 ]