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Three-phase electric power transmission
Three-phase electric power transmission

... a high-leg delta system, one winding of a delta transformer feeding the system is center-tapped. This setup produces three voltages. If the voltage between center tap and the two adjacent phases is 100%, the voltage across any two phases is 200% and neutral to "high leg" is ≈ 173%.[6] Three-wire dis ...
LM2907/LM2917 Frequency to Voltage Converter
LM2907/LM2917 Frequency to Voltage Converter

... attained with these types of pickups. The differential input options (LM2907, LM2917) give the user the option of setting his own input switching level and still have the hysteresis around that level for excellent noise rejection in any application. Of course in order to allow the inputs to attain c ...
Analog Voltage Controller Instructions - Gen
Analog Voltage Controller Instructions - Gen

ARCCOM String Combiner
ARCCOM String Combiner

INSTALLATION INSTRUCTIONS Macromatic Industrial Controls Inc.
INSTALLATION INSTRUCTIONS Macromatic Industrial Controls Inc.

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the guideline to electric propulsion
the guideline to electric propulsion

TL5002 Provides DDR Bus Termination Power
TL5002 Provides DDR Bus Termination Power

... power equal to the supply voltage (VDD) squared divided by the bus resistance. With a random voltage on the bus, the average loss is the supply voltage squared divided by twice the bus resistance. In the second scheme shown in Figure 1, the termination resistor is connected to a supply voltage (VTT) ...
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Power Electronics

... O t 0 t1 ...


AN3234: Washing Machine Three-Phase AC Induction Motor Drive
AN3234: Washing Machine Three-Phase AC Induction Motor Drive

... control structures, indirect vector control does not require direct real-time calculation of rotor flux from motor currents and voltages. Due to this indirect vector control, it is not possible to obtain instantaneous values of the rotor flux space vector components. It is, however, still possible t ...
Pi Controlled DC-DC Converter Based on Three-State
Pi Controlled DC-DC Converter Based on Three-State

... switching technique. As the power rating increases, it is often required to associate converters in series or in parallel. By using interleaving techniques in high current applications, the currents through the switches become just fractions of the input current [11]. Interleaving effectively double ...
additional maximum voltage and maximum power transfer conditions
additional maximum voltage and maximum power transfer conditions

... powers with a maximum of circuitmatched value which is concurrent with the corresponding maximum value of terminal voltage. In addition, the simultaneous discontinuities of voltages and powers shown are indicative of the existence of a cutoff load impedance value above which no transfer of voltage a ...
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... of energy to be utilized along with conventional systems to meet the energy demand. Renewable sources like wind energy and solar energy are the prime energy sources which are being utilized in this regard. The continuous use of fossil fuels has caused the fossil fuel deposit to be reduced and has dr ...
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Considerations for the Application of Thyristor Controlled Series
Considerations for the Application of Thyristor Controlled Series

... ƒ Reduced voltage fluctuations and voltage imbalance due to load variations In distribution systems, reactive power compensation is typically provided by shunt-connected components, such as SVC and STATCOM devices. Fixed series capacitors are clearly the most economical solution, but their optimal l ...
ACT4088US-T - Active-Semi
ACT4088US-T - Active-Semi

... The voltage at FB is monitored by a comparator to detect an extreme output overload condition. If the voltage at the FB pin falls to below 0.3V, the internal oscillator slows to a decreased frequency of 467kHz, 33% of the nominal value. This prevents the inductor current from rising excessively duri ...
A Novel Audio Amplifier MOSFET Trans
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... that Q7 is not in the forward signal path as it is only active in an overdrive situation. However, even  in the “normal” operating condition, a small current error term is always injected by this transistor.  High end audio seeks to eliminate all error terms no matter how slight their contribution m ...
PI4MSD5V9545A/B/C Product Databrief NEW PRODUCT
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... An active LOW reset input allows the PI4MSD5V9545A/45B/45C to recover from a situation where one of the downstream buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I2C/SMBus state machine and causes all the channels to be deselected as does the internal power-on reset function. Th ...
PES Instruction Manual - CIS Elektrotechnik GmbH
PES Instruction Manual - CIS Elektrotechnik GmbH

... into a load-independent direct-current and direct-voltage signal. The calibrated double-outputs can be switched over between 0-20 mA / 0-10 V and 4-20 mA / 2-10 V. ...
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... Two dimensional semiconductors and especially MoS2 have gained a lot of attention due to their unique properties. Finite bandgap, large Ion/Ioff ratio, good mobility, and nearly perfect subthreshold slope are among some of the features that make these materials attractive to researchers. While elect ...
this PDF file
this PDF file

english - KEK Concept GmbH
english - KEK Concept GmbH

dc regulated power supplies
dc regulated power supplies

< 1 ... 974 975 976 977 978 979 980 981 982 ... 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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