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Grid Code Impact on Electrical Machine Design
Grid Code Impact on Electrical Machine Design

... required field current to achieve rated voltage is larger. However, the field current for rated armature current on short circuit doesn’t change because the magnetic fluxes are balanced out in the air gap when short-circuited. If the temperature of the rotor in the original design is not low enough ...
RF5755 2.4GHz TO 2.5GHz 802.11b/g/n WiFi FRONT END MODULE Features
RF5755 2.4GHz TO 2.5GHz 802.11b/g/n WiFi FRONT END MODULE Features

... The RF5755 integrates the matching networks and DC blocking capacitors for all RF ports. This greatly reduces the number of external components and layout area needed to implement this FEM. Typically only a total of four external components are required to achieve nominal performance. However, depen ...
Aalborg Universitet A Multiagent-based Consensus Algorithm for Distributed Coordinated Control of
Aalborg Universitet A Multiagent-based Consensus Algorithm for Distributed Coordinated Control of

... circulating currents caused by the slight differences among phases and amplitudes of the output voltages [21], which cannot be eliminated only by maintaining the synchronization of the output voltage angles or amplitudes. In order to overcome the aforementioned challenges, this paper proposes a nove ...
BD9870FPS
BD9870FPS

... Ground Voltage Ensure that no pins are at a voltage below that of the ground pin at any time, even during transient condition. ...
Process Variation Aware Dynamic Power Management in Multicore Systems with
Process Variation Aware Dynamic Power Management in Multicore Systems with

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PDF

... 1) Single path block – selective connection:One BGRMPR design is connected to single-path blocks (less than 3)using switches (sleep transistors). However, only connections to maximum of two blocks could be turned on simultaneously because of limited capacity of BGRMPR to supply power. With this kind ...
Varistors MLA Datasheet
Varistors MLA Datasheet

... (EMC). The MLA Series is typically applied to protect integrated circuits and other components at the circuit board level. The wide operating voltage and energy range make the MLA Series suitable for numerous applications on power supply, control and signal lines. ...
4. Requirements for Communication
4. Requirements for Communication

... 3.1.1. The IMS-C shall provide 2 kinds of protection and control. For motors below 15kW, the IMS-C shall provide direct control functions through the internal contactor and circuit breaker, without any other complementary device: - Manual isolation, with the possibility to padlock the isolation. - D ...
LM137/LM337 3-Terminal Adjustable Negative Regulators
LM137/LM337 3-Terminal Adjustable Negative Regulators

MAX3803 Evaluation Kit ________________ General Description Features _________________________
MAX3803 Evaluation Kit ________________ General Description Features _________________________

... to ensure that no direct short exists between the supply voltage and supply ground. Normal dccoupled operation with all positive supplies causes permanent damage to laboratory test equipment because a dc path exists from the power supply to the ports of the oscilloscope or BERT. The MAX3803 EV kit m ...
Haptic Drive with Auto Resonance Detection for Linear Resonance
Haptic Drive with Auto Resonance Detection for Linear Resonance

... PWM frequency within the input range (10 kHz to 250 kHz) will automatically produce the correct resonant output frequency. As an additional benefit, the DRV2603 implements an automatic braking algorithm to prevent LRA ringing at the end of waveforms, leaving the user with a crisp haptic sensation. F ...
f. notes E283C8
f. notes E283C8

MAX3311/MAX3313 460kbps, 1µA Supply Current, RS-232-Compatible Transceivers in µMAX General Description
MAX3311/MAX3313 460kbps, 1µA Supply Current, RS-232-Compatible Transceivers in µMAX General Description

... increased without changing C1’s value. However, do not increase C1’s value without also increasing the value of C2 and CBYPASS to maintain the proper ratios (C1 to the other capacitors). When using the minimum 0.1µF capacitors, make sure the capacitance does not degrade excessively with temperature. ...
Motors and Generators
Motors and Generators

... Phase difference is another common term for phase angle. Phase difference describes two different voltages that have the same frequency, which pass through zero values in the same direction, but at different times. In the figure below, the angles along the axis indicate the phases of voltages e1 and ...
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... monitors capacity change, battery impedance, open-circuit voltage, and other critical parameters of the battery pack, and reports the information to the system host controller over a serial-communication bus. It is designed to work with the bq29330 analog front-end (AFE) protection IC to maximizes f ...
Power Requirements - Rockwell Automation Knowledgebase
Power Requirements - Rockwell Automation Knowledgebase

... NOTE: The “I/Q DP-4000” is similar to the “I/Q Data Plus” (Used until late 1997) both electrically (Same Input devices required, although connection points may be different and it provides some extra features) and mechanically (Same mounting dimensions), and it can be used as a direct substitute. 01 ...
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Single phase controller with digital interface

... 1. Data guaranteed by design. ...
MAX378/MAX379 High-Voltage, Fault
MAX378/MAX379 High-Voltage, Fault

... voltage is +60V, Q1 has a negative VGS, which turns it off. Similarly, only sub-microamp leakage currents can flow from the output back to the input, since any voltage will turn off either Q1 or Q2. Figure 9 shows the condition of an OFF channel with V+ and V- present. As with Figures 7 and 8, eithe ...
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NCP1207A, NCP1207B PWM Current--Mode Controller for Free Running Quasi--Resonant Operation

AD8351 数据手册DataSheet 下载
AD8351 数据手册DataSheet 下载

... The terminating resistor, RT, should be as close as possible to the input pins in order to minimize reflections due to impedance mismatch. The 150 Ω output impedance may need to be transformed to provide the desired output match to a given load. Matching components can be calculated using a Smith Ch ...
ADD8754-EVAL Evaluation Kit for LCD Power
ADD8754-EVAL Evaluation Kit for LCD Power

... Gate Pulse Modulation. Accepts digital inputs from the timing controller (TCON) and provides a modulated VGH waveform (VGH_M). VCOM Amplifiers. Provides access to the VCOM amplifier. The potentiometer in Block 9 adjusts the VCOM voltage. AD5259 Serial Port. Accepts a serial port. Only boards with th ...
Power System Damping Enhancement Using Combined Operation of Robust Energy
Power System Damping Enhancement Using Combined Operation of Robust Energy

IOSR Journal of Electrical and Electronics Engineering (IOSRJEEE)
IOSR Journal of Electrical and Electronics Engineering (IOSRJEEE)

Amateur Radio Technician Class Element 2 Course Presentation
Amateur Radio Technician Class Element 2 Course Presentation

743CB Series FIELD STATION MICRO Controller
743CB Series FIELD STATION MICRO Controller

... and overshoot-to-load change, such as quarter amplitude damping. ...
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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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