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IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)

... Fuzzy-Logic-Controller-Based Fault Isolation in PWM VSI for Vector Controlled Induction… response. This type of fault may result the disconnection of the semiconductor due to lifting of bonding wires caused by thermic cycling or due to a problem in the gate control signal [3]. This kind of failure ...
Measuring transducers for alternating voltage U
Measuring transducers for alternating voltage U

PDF
PDF

... solenoid-spring operating mechanism. The recloser will be opened and closed by means of energy provided by a motor operating at 240 Vac, 60 Hz and stored in springs for both tripping and closing operations. Bushings will be of “wet” process porcelain and will have a standard creepage distance of 12" ...
ECE 4884 : Senior Design
ECE 4884 : Senior Design

... LED topography: 3 branches of 3 diodes each ...
8873 Tube Data
8873 Tube Data

Lab Manual
Lab Manual

... Signals are converted from analog to digital, manipulated digitally, and then converted again to analog form, as diagrammed below. Many DSP applications have constraints on latency; that is, for the system to work, the DSP operation must be completed within some time constraint. ...
design of high speed switched reluctance motors
design of high speed switched reluctance motors

... motor and prediction of all fundamental characteristics. However, to calculate the static torque more accurately and optimize the magnetic circuit, the FEM is recommended. For a quick industrial design the use of the FEM is not necessary since the lumped-parameter analysis is complete in itself [3,6 ...
TECHNICAL DATA
TECHNICAL DATA

... guaranteed specifications and the test conditions, see the Electrical Characteristics. NOTES 2: Power Dissipation is kept in a safe range by current limiting circuitry. Refer to Overload Recovery in Application Notes. NOTES 3: The maximum power dissipation is a function of Tj(MAX), ΘjA and TA . The ...
edc-module_iib-three_phase_im
edc-module_iib-three_phase_im

... Robust; No brushes. No contacts on rotor shaft High Power/Weight ratio compared to DC motor Lower Cost/Power Easy to manufacture Almost maintenance-free, except for bearing and other mechanical parts • wide range of power ratings: fractional HP to 10 MW ...
The Online UPS
The Online UPS

Kollmorgen 8Ch Digital Output Datasheet en
Kollmorgen 8Ch Digital Output Datasheet en

... 8-Channel Digital Outputs - 24 V DC, 0.5 A The 8-channel digital output terminals connect the binary control signals from the automation unit on to the actuators at the process level with electrical isolation and are protected against reverse polarity connection. They handle load currents with outpu ...
Modular Control Electronics Unit
Modular Control Electronics Unit

EASI™ Accessories - DVP412/432 tib v2
EASI™ Accessories - DVP412/432 tib v2

... EASI™ ACCESSORIES - DVP412 & 432 POWER SUPPLY UNITS The DVP units are power supplies for the EASI™ rack installations. They use primary switch mode technology thus providing a wide input voltage range, high efficiency and reliability. All units are short circuit and over temperature protected. ...
Evaluation-of-Current-Control-Strategy-and-Direct-Power
Evaluation-of-Current-Control-Strategy-and-Direct-Power

... A shunt active power filter is widely accepted a solution for mitigation of current harmonics at Point of Common Coupling in the distribution system. The performance of shunt active power filter as a device depends largely on the current control technique applied. This paper focuses on the evaluatio ...
Session 9.2 J. Ritchey Improving Generators and Motors Using
Session 9.2 J. Ritchey Improving Generators and Motors Using

... Converts existing rotating machines into a multitude of different machines, all with different operating characteristics. Transitions between operating conditions seamlessly in real time and under load. DCM accommodates high coil count - electronic gearing (reduction or removal of gearbox) Provides ...
Will Reducing The Line Voltage Save Energy?
Will Reducing The Line Voltage Save Energy?

... reduced. While this relationship between energy savings and light voltage is not exactly a 1-to-1 ratio, it is close. A 5% line voltage reduction will produce about a 5% reduction in the system input power. However, electronic ballasts with active front ends (like older Motorola or the newer SYLVANI ...
CSLA2CD
CSLA2CD

... Honeywell CSLA series linear current sensors incorporate our 91SS12-2 and SS94A1 linear output Hall effect transducter (LOHET™). The sensing element is assembled in a printed circuit board mountable housing. This housing is available in four configurations. Normal mounting is with 0.375 inch long 4- ...
BBA IInd SEMESTER EXAMINATION 2008-09
BBA IInd SEMESTER EXAMINATION 2008-09

... Explain in brief how efficiency is obtained from Swinburne’s Test. Explain what would happen, if the dc motor is directly switched on to the supply without any starter. What is the difference between 3 single phase transformer bank and a 3-phase transformer unit? Discuss the conditions necessary for ...
Inteli-PowerTM
Inteli-PowerTM

... Our testing has shown that the super-quiet cooling fan will only rarely come on during normal operation of an organ. Convenient, heavy duty recessed-screw terminals for Positive and Negative outputs are provided as are permanent, “organ appropriate” mounting provisions. A three foot line cord can pl ...
Ground-Reference Popless Stereo Headphone Driver
Ground-Reference Popless Stereo Headphone Driver

... The G1412 stereo headphone driver is designed for portable equipment where board space is limited. The G1412 uses the dual external power supplies PVDD/NVDD to produce a ground-reference output, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. Th ...
Three Phase Semi Converter
Three Phase Semi Converter

... semiconverter for different firing angles At any instant thyristor connected to most positive line terminal and diode connected to most negative line terminal conducts.For 0≤α≤π/3 each diode and thyristor conducts for 2π/3 radians.Thefree wheeling diode does not conduct for α<π/2.The free wheeling d ...
Integrated Circuit Voltage Regulators
Integrated Circuit Voltage Regulators

... cause erratic behaviour. The part of a power supply unit responsible for maintaining a constant output voltage is called the voltage regulator. Voltage regulators maintain a constant output voltage even when operating conditions tend to cause a change in voltage. Two such conditions may occur: 1. Th ...
Project Proposal - ECE Senior Design
Project Proposal - ECE Senior Design

... operation modes. To operate microinverter in the standalone will be significantly beneficiary in the residential applications to maintain critical loads during the power outage due to either heavy storm or sever hurricane. Filter design and mode transition will be considered additionally for grid-co ...
control of air flow rate of single phase induction motor for
control of air flow rate of single phase induction motor for

No Slide Title - Electrical & Computer Engineering
No Slide Title - Electrical & Computer Engineering

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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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