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Voltage control of self excited induction generator Voltage control of self excited induction generator Новинка

Voltage control of self excited induction generator

4468 руб.
Today the world is looking towards the efficient energy generation from renewable energy sources because of extinction of fossil fuels.Wind energy is a promising source of green energy.But the problem associated with this kind of energy id due to varying wind speeds the out put is also varying so it is not possible to integrate it to grid.Here Induction generators are dominantly used because of their advantages in variable speed torque characteristics.In this book an attempt is made to discuss different types of generators used in wind energy and different topologies for control of voltage and frequency of Self Excited induction generator are discussed and new promising methods are proposed for low cost power generation.
The self excited induction generator The self excited induction generator Новинка

The self excited induction generator

7466 руб.
The objective of the harnessing of such non-conventional energy sources could be achieved in a big way by the development of the suitable low cost generating systems. The self excited induction generator (SEIG) is a suitable power generation source utilizing renewable energy sources due to its advantages as compared to conventional synchronous generator. SEIG can generate single phase and three phase power using three phase induction motor. The SEIG has a major drawback of poor voltage regulation. For this purpose, a suitable control scheme is to be developed such that the load on the SEIG remains constant despite the change in the consumer load. One way to regulate the voltage and frequency of the SEIG is to maintain a constant load at its terminals. Also, such control scheme should be simple, economical, rugged and reliable. The use of DSP gives cost effective solution with least hardware complexity. The performance of SEIG can be further improved with STACOM based controller for reactive power compensation or voltage source converter with bidirectional active and reactive power flow capability.
Wound Rotor Induction Generator Scalar Modeling and Control Wound Rotor Induction Generator Scalar Modeling and Control Новинка

Wound Rotor Induction Generator Scalar Modeling and Control

5918 руб.
In the field of electrical power generation, the wind energy is one of the important sources of renewable energy. The main problem with this type of energy is the variable nature of the wind speed. The wound rotor induction generator is used to handle this speed variations by adequate voltage injections in the rotor circuit to maintain the stator voltage and frequency constant irrespective to speed or load variations. This book deals with the analysis, steady state modeling, and control of the wound rotor induction generator that can be used in wind energy applications. Moreover the linear control strategy used is analyzed in terms of all its operating conditions and output quality. The theory was validated via experimental setup to compare theoretical, simulation and practical results to evaluate the usefulness and effectiveness of the system.
DTC ANN Control Of Wind Turbine Induction Generator Set DTC ANN Control Of Wind Turbine Induction Generator Set Новинка

DTC ANN Control Of Wind Turbine Induction Generator Set

4631 руб.
IEEE & IJCEE 1. The author has provided a sufficiently critical evaluation from which one can deduce that this work can potentially produce a significant contribution to the subject area. 2. The paper was organized well and is having good technical merit suits to smart grid conferences and research work in present scenario. 3. This is a much better technique to assure the better speed and torque control by using sophisticated ANN controller than with conventional PI controller
DIY ZVS Tesla Coil Power Supply Boost Voltage Generator Drive Board Induction Heating Module DIY ZVS Tesla Coil Power Supply Boost Voltage Generator Drive Board Induction Heating Module Новинка

DIY ZVS Tesla Coil Power Supply Boost Voltage Generator Drive Board Induction Heating Module

8.7 руб.
DIY ZVS Tesla Coil Power Supply Boost Voltage Generator Drive Board Induction Heating Module Specification: Size: 74mm x 77mm Input voltage: DC 12V-30V Output: HVDC, About 800 times of input voltage Power requirements: Less than 12V 5A, above 15V 15A Operating frequency: 30kHz-50kHz adaptive Secondary parameters: 5T + 5T Feature: 1. Using military FR4-A material 1.6mm double-board circuit board, power line extra add tin and optimizes line width of MOS tube drive circuit. 2. Using two IRFP250N power field pipe, large current, small internal resistance, super-power. 3. Using 1.25 copper wire large inductance, more stable performance. 4. Using 1% precision metal film resistors. 5. Use 25 * 24 * 16mm thick anti-static cooling. 6. Using MKP 0.33UF 1200V two parallel resonant capacitor for high frequency. Precautions: 1. After finish the installltion, carefully check it and verify that all components soldered correctly 2. Please note that the positive and negative signs of input power, carefully check to prevent reverse burning plate 3. The test voltage is recommended for the low power 12v, prevent mis-wiring problems or cause burning plate 4. Drive board limit input is DC 30v, current 10A, not recommended using limits, do not long working under overvoltage and overcurrent conditions. Driver board is not suitable for induction heating, if you need induction heating, it is recommended input voltage 15v or less. For induction heating or long use high-power must need to add the cooling fan, if poor heat dissipation, it will result in MOS tube temperature is too high, will accelerate the aging of MOS tube even burn and other issues. Note: This is a DIY kit, you need to have electronic knowledge and ability. Package includes: 1 x ZVS Tesla Coil Power Supply Boost Voltage Generator
Three Phase Low Voltage Induction Motor Drive Three Phase Low Voltage Induction Motor Drive Новинка

Three Phase Low Voltage Induction Motor Drive

4468 руб.
The emphasis on the theoretical study and simulation of the three phase induction motor drives is certainly due to the fact of fatal hazards associated with the high voltage and current signals present in the three phase induction motor drives. Other important feature is the cost of a full-scale drive system to test various switching, control and protection strategies. Therefore, design stage comes after a reasonable confidence and verification of the drive circuit and control strategies through simulations. In this work, a laboratory-scale low-voltage induction motor drive is designed which operates at 24 volts, accompanying with the simulations using Matlab and Simulink.
Enhancement of Power System Stability by Using DFIG Based Wind Farm Enhancement of Power System Stability by Using DFIG Based Wind Farm Новинка

Enhancement of Power System Stability by Using DFIG Based Wind Farm

5283 руб.
Due to random variations of wind speed, output power of a wind turbine generator fluctuates continuously. The power and voltage quality of a wind power system consisting of Induction Generator (IG) based wind turbine (IGWT), IGWT with voltage control device and Doubly Fed Induction Generator (DFIG) based wind turbine (DFIGWT) are presented in this work. Blade pitch angle control to limit the output power at turbine’s nominal power is also presented. It is reported that the DFIG-based wind turbine system can smooth the output power and also maintain the terminal voltage at a desired level, as DFIG with two back-to-back voltage source converters that use IGBTs and a capacitor acts as the DC voltage source has real and reactive power control abilities. The comparative results show that DFIGWT-based wind farm (DFIG_WF) has the best response, IGWT-based wind farm (IGWF) with voltage control device has better and IGWF has the worst response. Results indicate that the fluctuation of output power at higher rated rotor speed (near turbine’s base wind speed) and terminal voltage are almost nil for DFIG_WF. All the analysis were carried out using SimPowerSystem tool box in MATLAB.
Self-Excited Oscillations of Elastic Tubes Self-Excited Oscillations of Elastic Tubes Новинка

Self-Excited Oscillations of Elastic Tubes

6426 руб.
The phenomenon of self-excited oscillations of elastic tubes induced by fluid-structure interaction is studied. The study is mainly motivated by vessel collapse and self-excited oscillations observed in the human body. The mixed formulation of the finite element is used for the simulation of the structure. The structure model is three-dimensional and uses a hyperelastic material description. Four material models are implemented: the Neo-Hookean model, the Mooney-Rivlin model, the isotropic Gent model and the anisotropic Gent model. The fluid is considered as a Newtonian liquid, modeled by the artificial viscosity approach. The fluid solver uses a spatially one-dimensional. Both the structure and fluid solver are validated by seven benchmarks with an analytical solution. The strong coupling of the structure and fluid solver is used. The steady-state dependence of the tube cross-section with respect to the transmural pressure is investigated for different collapse modes. The unsteady behaviour is studied and self-excited low-frequency oscillations are found. A comparison with experimental data, obtained by other authors on the Starling resistor set-up line, is carried out.
Response and Control of a Wind Farm of Different Zones and Generators Response and Control of a Wind Farm of Different Zones and Generators Новинка

Response and Control of a Wind Farm of Different Zones and Generators

7204 руб.
For a wide areas wind farms,that composed of many connected zones of different wind turbines and different generators, this book aims to study , model , and simulate of a wind farm model that includes a wind turbine and three different types of generators. The proposed generators are , three phase synchronous generator, three phase squirrel-cage induction generator and three phase doubly-fed induction generator, these generators are the main machines that generally used in the field of wind energy generation. All generators are connected in parallel at the point of common coupling (pcc) and connected to the utility grid. Different line faults are simulated, and wind power system stabilization is achieved using pitch controller. Several experimental results were taken and discussed in this book.
Controlling Of Two-phase Induction Machine By Supply Phase Shift Controlling Of Two-phase Induction Machine By Supply Phase Shift Новинка

Controlling Of Two-phase Induction Machine By Supply Phase Shift

6201 руб.
In this book a phase-difference angle (PDA) controlled pulse width-modulated (PWM) inverter instead of phase voltage modulation and/or frequency changing is proposed to control the speed, and position of a two-phase induction motor. Several characteristics of a two–phase induction motor driven by the PDA inverter are studied to verify the improvement of the motor performances. Also, speed, and position tracking are achieved using the proposed control technique. The book covers in more details the main principles characteristics of the two-phase induction motor especially at voltage, frequency, PDA changing. The difference among them is studied carefully to conclude the best control method. For unbalanced operation of the two-phase induction motor when used either as a servomotor or single-phase applications. The method of symmetrical components transformation is used to simplify the steady state analysis of the machine.. An experimental prototype, which consists of a PC computer based controller, a PDA inverter, and two phase induction motor is used to verify the validity of the proposed control technique .
Steady state analysis of induction motor with state variable technique Steady state analysis of induction motor with state variable technique Новинка

Steady state analysis of induction motor with state variable technique

4631 руб.
The application of thyristor switching to induction motor speed control has resulted in a number of unconventional supply systems. One such technique, which has been successfully employed in a number of applications, is variable voltage control by means of symmetrically triggered thyristors in the stator phases of a wye-connected machine. In our project, an analytic method for predicting the steady-state performance of such a system is presented using the state variable technique. The use of symmetry of the solution permitted an additional reduction in the computation time. Since matrix techniques are utilized throughout the analysis, and the equations are implemented into a digital computer program. Hence, the method is well suited to the evaluation of proposed motor designs when used in conjunction with thyristor voltage control. The torque-speed characteristics of a typical drive system simulated using the MATLAB Simulink models are included and the results compared to an analytical solution formed. It is demonstrated that a computed solution will favorably predict the performance of an actual system.
Control of Designed Developed Six Phase Induction Motor Using MATLAB Control of Designed Developed Six Phase Induction Motor Using MATLAB Новинка

Control of Designed Developed Six Phase Induction Motor Using MATLAB

4468 руб.
This project was sponsored by M/s Jyoti Switchgear Ltd, Mogar, Anand, Gujarat, India for actual design and development of prototype six phase Induction Motor. Control of the designed developed six phase Induction motor was carried out using Matlab Software by simulation. The Actual Control was sponsored by "Vacon-India Ltd", Chennai, India This is a research work for Ph.D. in Electrical Engineering, The Maharaja Sayaji University-Faculty of Technology- Department of Electrical Engineering, Baroda.
Speed Control of Induction Motor Using Microcontroller Speed Control of Induction Motor Using Microcontroller Новинка

Speed Control of Induction Motor Using Microcontroller

4631 руб.
-- To implement speed control of induction motor. -- To implement closed loop volt per hertz technique based speed control of induction Motor using Matlab Simulink. -- To implement the above proposed model using Microcontroller (8051) -- This type of drive is suitable for applications which do not require high levels of accuracy or precision, such as pumps and fans. -- Low cost because there is no feedback device, the controlling principle offers a low cost and simple solution to controlling economical AC induction motors.
Modeling and Control of DFIG-based Variable Speed Wind Turbine Modeling and Control of DFIG-based Variable Speed Wind Turbine Новинка

Modeling and Control of DFIG-based Variable Speed Wind Turbine

4468 руб.
ABSTRACT The demand for electric energy is increasing day by day that has resulted in exploration of more and more alternate energy sources. Among the available alternate energy sources, wind energy, solar energy and fuel cells have drawn considerable attention. Further, all of these alternate energy sources are also of renewable nature. Among the mentioned alternate energy sources, wind power generation systems have been the most cost competitive alternative among all the environmentally clean and safe renewable energy sources in the world. Both fixed-speed squirrel-cage induction generator and variable speed double fed induction generator have been proposed in the literature for wind turbine generation technology. Since the direction and speed of winds may vary from location to location and time to time, the variable speed wind turbine technology offers inherent advantages over the fixed-speed one. The doubly fed induction-generator (DFIG) is used in tandem with the wind turbine to produce electric energy. The DFIG with the help of the two back to back converters: rotor side and grid side converters, is able to deal with wide variation of wind speed.
Control System of DFIG for Wind Power Generation Systems Control System of DFIG for Wind Power Generation Systems Новинка

Control System of DFIG for Wind Power Generation Systems

4733 руб.
Electrical power is the most widely used source of energy for our homes, work places and industries. Population and industrial growth have led to significant increases in power consumption over the past three decades. Natural resources like coal, petroleum and gas that have driven our power plants,industries and vehicles for many decades are becoming depleted at a very fast rate. This serious issue has motivated nations across the world to think about alternative forms of energy which utilize inexhaustible natural resources. Renewable energy like solar, wind, and tidal currents of oceans is sustainable, inexhaustible and environmentally friendly clean energy. Due to all these factors, wind power generation has attracted great interest in recent years. Undoubtedly, wind power is today’s most rapidly growing renewable energy source. Many of the new, large turbines being produced are variable speed turbines,which use doubly fed induction generators (DFIG). These are induction generators which have their stator and rotor independently excited. Turbines of this type are becoming increasingly popular, because the converters required to control them are cheap and subject to less losses.
Protection of Three Phase Induction Motor using PIC18F4431 Protection of Three Phase Induction Motor using PIC18F4431 Новинка

Protection of Three Phase Induction Motor using PIC18F4431

4338 руб.
Three phase induction motors are widely used in many industrial applications.As these operate on electric supply and have mechanical moving parts,they often face electrical and mechanical faults. the electrical faults like overvoltage, overcurrent, overload, single phasing are have to be taken care of. The PIC microcontroller 18F4431 is provided with 8 PWM generators to create and control PWM to control voltage and speed of motor. with the help of this advanced chip we can protect this three phase induction motor
Power Electronic Interfaces in Wind Energy Systems Power Electronic Interfaces in Wind Energy Systems Новинка

Power Electronic Interfaces in Wind Energy Systems

4716 руб.
The greatest contribution to researchers, who are working on renewable power generation sources especially on wind energy systems. The author explores different type of power electronic interfaces connected to isolated loads or grid. The book gives complete idea about the different approaches for steady-state analysis of self excited induction generator. The book must read for basic concepts and detail understanding about the possible power electronic interfaces in wind energy systems.
Vector control of induction motors considering  magnetic saturation Vector control of induction motors considering  magnetic saturation Новинка

Vector control of induction motors considering magnetic saturation

5380 руб.
In this study, a mathematical dynamic model of an induction motor as influenced by magnetic circuit saturation is developed. Moreover, a modified structure of indirect vector controller scheme is proposed which involves the saturated value of the magnetizing inductance. In order to overcome the disadvantages of the vector control drive system such as speed sensor and parameter sensitivity, two proposed control systems have been developed. In the first system, a simultaneous stator resistance and motor speed estimation based on a modified Model Reference Adaptive System (MRAS) has been used to obtain accurate estimation for motor speed taking the effect of magnetic flux saturation into account. Online magnetizing inductance estimation has been presented to consider the effect of saturation in the proposed system. In the second system, an effective online method for rotor resistance estimation based on a modified MRAS to achieve high-precise control in a wide range of motor speed taking the effect of magnetic circuit saturation into account.
E27 Infrared Voice Control Induction Light Shell Cover - White E27 Infrared Voice Control Induction Light Shell Cover - White Новинка

E27 Infrared Voice Control Induction Light Shell Cover - White

1266.4 руб.
Material ABS Color White Quantity 1 Piece Rate Voltage 220V Working Current 1.5 A Connector Type E27 Other Features Induction distance: 8m Packing List 1 x E27 infrared induction light shell
Design of Direct Torque Control of an Induction Motor in FPGA Design of Direct Torque Control of an Induction Motor in FPGA Новинка

Design of Direct Torque Control of an Induction Motor in FPGA

3393 руб.
Direct torque control or DTC is a very latest ac drive technology which can replace traditional PWM drives of open or closed loop control method. DTC describes the control of torque of a motor directly based on the electromagnetic state of the motor as similar to a dc drive. DTC allows the motor’s torque and stator flux to be used as the primary control variables which are obtained directly from the motor by using advanced motor theory. The major problems faced by Direct Torque control of an induction machine are the production of the high torque ripples present in the output of the induction motor. The torque ripple is caused by the use of the three level hysteresis comparator for torque comparison. This ripple can be reduced by using a special controller for torque comparison. By proper selection of the torque controller parameters the torque ripple can be reduced. The objective of the thesis is to model and simulate the direct torque control of the induction motor with this technique using MATLAB simulink package and show its feasibility by comparing it with the available DTC method. The models are developed from the various mathematical equations governing the system.
Excited Jet and Its Applications Excited Jet and Its Applications Новинка

Excited Jet and Its Applications

4468 руб.
Excited jets are an excellent platform for the study of fluid dynamics and turbulence as they display numerous phenomena that are encountered throughout the field of fluid dynamics. Many researchers have worked on jet flow control to enhance mixing and/or reduce noise. The impetus for the present study was to throw some light on various types of excited jets used so far in engineering applications.
Harmonic Impact and Optimization of Distributed Generation Harmonic Impact and Optimization of Distributed Generation Новинка

Harmonic Impact and Optimization of Distributed Generation

5918 руб.
A comprehensive study is made to compare the harmonic distortion produced by the different types and number of distributed generation (DG) units in a low voltage distribution system. Here, three types of DG units are considered, namely, a mini hydro power, wind turbine doubly fed induction generator and photovoltaic system. To determine the maximum allowable penetration level of inverter based DG, harmonic resonance phenomena and harmonic distortion limits are also considered. To control harmonic propagation in a distribution system with DG units, an appropriate planning of DG units is considered by determining optimal placement, sizing and voltage control of DG units. Thus, an effective heuristic optimisation technique such as improved gravitational search algorithm (IGSA) technique is also developed for determining the optimal placement, sizing and voltage control of DG units in a radial distribution system.
Chatter Control in Induction Heat Assisted End Milling Chatter Control in Induction Heat Assisted End Milling Новинка

Chatter Control in Induction Heat Assisted End Milling

5097 руб.
The conventional induction heating method, used for heat treatment of parts has been customized as a novel method for heat assisted machining of metallic materials. This method is very clean and of low cost compared to laser heating. The method is especially applicable in milling operations with high width of cut, which a single laser can not cover and there is a need of employing multiple lasers. Heating time is very short and only the skin of the work piece is heated and removed during machining. Cutting forces are low due to lower yield strength of the materials at elevated temperature, chatter is damped and surface roughness and tool wear are low. This innovative method if applied to the industry would lead to higher productivity and lower cost of machining.
The Science of Self–Control The Science of Self–Control Новинка

The Science of Self–Control

2377 руб.
The Science of Self–Control
Fault-Tolerant Control of Multiphase Induction Motor Drives Fault-Tolerant Control of Multiphase Induction Motor Drives Новинка

Fault-Tolerant Control of Multiphase Induction Motor Drives

5097 руб.
Although three-phase electric machines play a great role in almost all industrial applications, they still have limitations to cover high power requirements needed for traction, propulsion and other high power applications. Nowadays, multiphase electric machines with high output power can solve this problem. A multiphase machine does not only provide higher torque per unit volume, but it also provides higher degrees of reliability due to fault-tolerant capability provided by the additional degrees of freedom. This is a crucial issue for safety-critical applications, e.g., electric ship propulsion, air crafts and aerospace applications. This work presents in details a seven-phase induction motor drive based on indirect field oriented control technique with fault-tolerant controller, which allows the motor to ride-through the fault period caused by a phase loss. Using MATLAB simulation, the problem of “phase disconnection” is addressed and two fault-tolerant control strategies are proposed to compensate its effect.
Induction Motor Speed Control Technique Using Intelligent Methods Induction Motor Speed Control Technique Using Intelligent Methods Новинка

Induction Motor Speed Control Technique Using Intelligent Methods

6606 руб.
Book relates to the speed control of an induction motor introduced intelligent methods such as Fuzzy Logic Control (FLC), Artificial Neural Networks (ANN), Adaptive Neural Fuzzy Inference System (ANFIS) and Optimization Techniques such as Genetic Algorithm (GA), Sequential Quadratic Programming (SQP) and Particle Swarm Optimization Algorithms(PSO).The results showed that the PSO-PI controller can perform with an efficient way for searching for the optimal PI controller. Comparison study among fuzzy logic, neural network, Adaptive Neural Fuzzy Inference System , genetic algorithm, sequential quadratic programming and particle swarm optimization controllers are performed. These methods can improve the dynamic performance of the system in a better way.The PI-PSO controller is the best method based on integrated of time weight absolute error (ITAE)criteria which presented satisfactory performances and possesses good robustness (no overshoot, minimal rise time, steady state error almost to zero value). A comparison study has been done between selected methods and some other technique which showed that the proposed controller has setting time less than other methods by 40%.
Low Cost DC High Voltage Generator for Industries and Laboratories Low Cost DC High Voltage Generator for Industries and Laboratories Новинка

Low Cost DC High Voltage Generator for Industries and Laboratories

4631 руб.
This work describes the details of high voltage D.C. power supply whose output is 60 kV, whereas its input voltage is 1-? 50 Hz 5 kV of sinusoidal waveform. This test set is suitable for field testing of high voltage cables, as a prime D.C source for very low frequency high voltage test, oscillating wave technique and impulse voltage charging unit due to its light weight and portability. In this study, we constructed a prototype high voltage power supply based on design, simulation and implementation of hardware work in laboratory. The simulation work has been done by using Mat. Lab. Version 7.0 software. This developed equipment will be very useful for field testing of HV cables of different voltage grade, as a prime DC source for VLF and OW testing set and charging unit of impulse generators.
Induction Motor Control Induction Motor Control Новинка

Induction Motor Control

4631 руб.
This book explains the method to control the three basic things of an induction motor. 1.Switching 2.Direction of rotation 3.speed. This book explains the simple ways to control the direction of the motor and switching of the motor. By switching i mean the on off state of the motor. To control the spped of the motor i have used cycloconverter. The advantage of cycloconverter of using cycloconverter is that on low speed the torque of the motor is maintained while using other methods we face a problem that on low speed the torque of the motor is reduced which is a major cause of wastage of electricity. Cycloconerter is direction conversion method means that it has no intermediate stage while changing the supply frequency given to the motor. Which shows that it power is maintained even at low speed.In most of the cases while changing the frequency we change the frequency first we converter AC into DC and then back to AC to change the frequency while in cyclonverter there is direction conversion, no intermediate state which is good for both power and torque of the motor.
Modeling and Automatic Generation Control of Interconnected Thermal Unit Modeling and Automatic Generation Control of Interconnected Thermal Unit Новинка

Modeling and Automatic Generation Control of Interconnected Thermal Unit

4631 руб.
This book deals with the automatic generation control of interconnected thermal systems with Combination of the automatic voltage control and market based deregulated system. In this Particular work thermal unit is considered with two area concept. The primary purpose of the AGC is to balance the total system generation against system load and losses so that the desired Frequency and power interchange with neighboring system are maintained. Any mismatch between generation and demand causes the system frequency to deviate from scheduled value. Thus high frequency deviation may lead to system collapse. Further the role of automatic voltage regulator is to hold terminal voltage magnitude of synchronous generator at a specified level. The interaction between frequency deviation and voltage deviation is analyzed in this book. System performance has been evaluated at various loading disturbances and at the last market structure is considered. Availability of frequency based tariff scheme is employed. Demand can be managed by managing the tariff.
MaiTech 03100650 12V Human Body Induction Sensor Switch Module - Green MaiTech 03100650 12V Human Body Induction Sensor Switch Module - Green Новинка

MaiTech 03100650 12V Human Body Induction Sensor Switch Module - Green

399.1 руб.
Features: Based on infrared technology automatic control products when someone come into the switch sensing range special sensors detect changes in the infrared spectrum of the human body output high automatically people do not leave the sensing range of activities will continue to output high; After people left switch delay and automatically shut down load. With high sensitivity high reliability widely used in various auto-sensing electrical equipment. Scope: Advertising digital photo frame LED strip lighting and other electrical automatic control and other functions and can be used for security purposes. Trigger mode: continuous trigger can not be continued trigger. Delay time: 15 seconds by default Low power consumption: switch its power consumption <0.00005W Operating voltage: 12V DC Sensing distance: 2~5 meters Sensing angle: 140 degree cone angle Light control sensing: 5~-500LUX Ambient temperature: -20~+50'C
Locus of Control, Self Concept and Academic Achievement Locus of Control, Self Concept and Academic Achievement Новинка

Locus of Control, Self Concept and Academic Achievement

3274 руб.
The study used a correlation design to explore relationships among locus of control, self concept & academic achievement. The study population comprised all the form four students from the 52 public secondary schools in Bureti District. Stratified random sampling was used to select 5 secondary schools with simple random sampling being used to select 200 students. Data was collected using a questionnaire to generate both qualitative and quantitative data. The study findings revealed that students had a positive self concept & internal locus of control. It further established that majority of the students believe in themselves, have control of their lives, evaluated themselves positively and also accepted their identity. Pearson correlation coefficient analysis revealed that there was a significant but weak correlation between students’; academic performance and locus of control; students’ academic performance versus self concept & also a significant difference between female and male students’ locus of control. However, the results showed that there was no significant gender difference in students self concept.
Reduced Switch Z-Source Inverter Fed Induction Motor Drive Reduced Switch Z-Source Inverter Fed Induction Motor Drive Новинка

Reduced Switch Z-Source Inverter Fed Induction Motor Drive

5380 руб.
This work focuses on the performance analysis of a reduced switch three phase Z-source inverter fed cost effective induction motor drive system. In the proposed approach, instead of a conventional six switch three phase inverter a four switch three phase Z-source inverter is utilized. This reduces the cost of the inverter, the switching losses, and the complexity of the control algorithms. The new Z-source inverter system provides ride-through capability during voltage sags, reduces line harmonics, improves power factor, reliability and extends output voltage range. Validations of the theory and reduction methods are performed experimentally. This proposed method is able to reduce conduction noise in contrast with the existing conventional inverters. Analysis, simulation and experimental results are presented to demonstrate these new features.
Induction Motor Performance Improvement Induction Motor Performance Improvement Новинка

Induction Motor Performance Improvement

4631 руб.
In this book, Induction Motor (IM) efficiency and power factor improvement is proposed. Procedure of obtaining maximum efficiency point is demonstrated. When operating at slip of max. eff. the motor characteristics are compared with the motor conventional ones operating at rated voltage. It gives suitable operating voltage to drive motor at maximum efficiency for certain load torque. A general – purpose voltage – frequency pattern is investigated. Optimum efficiency operation at variable frequencies is presented with sample points. The required voltage relations at any frequency to drive the motor at optimum efficiency are deduced too. Load torque types operated at optimum efficiency are introduced also. Adaptive model of induction motor using neural networks is created. Two ANN sensorless units are displayed one for voltage reduction at motor max. eff. with base frequency; while second for voltage at any load torque value with frequency for motor optimum efficiency. Experimental part is illustrated to verify theoretical one with a complete test-bed and finally ANN Experimental model depending on experimental data is adopted to be used in speed estimation.
Back-to-Back Power Electronic Converter Control for Active Damping Back-to-Back Power Electronic Converter Control for Active Damping Новинка

Back-to-Back Power Electronic Converter Control for Active Damping

4468 руб.
One of the most important aspects for large scale integration of wind power systems is the fault ride through (FRT) capability during voltage sags. What this means is that wind turbines should be continuously on-line and supply the grid during voltage sags. Large voltage sags induce high voltages in the rotor circuit of the DFIG and thus the rotor current rises and could exceed the current capability of the converter switches. In the instant of such faults, there is usually a power imbalance between the generator and the grid that usually cause the DC-link voltage rise because of the excess power generated that can not be transferred to the grid. Against the use of crowbar to block the converter and then to disconnect the generator from the grid or by reducing the power generated or maximizing the power supplied to the grid, an active damping criterion in the control of the BtB converter is proposed in this book. The phenomenal increase in these quantities together with other disturbances are by this process rejected and/ or damped thereby making the grid less sensitive to harmonics and oscillations. By this, the wind turbine stays on-line and continues to supply the grid.
Modeling & Fault Diagnosis of IM by using  Intelligent Control Modeling & Fault Diagnosis of IM by using  Intelligent Control Новинка

Modeling & Fault Diagnosis of IM by using Intelligent Control

7204 руб.
This book as it is clear from the title, deals with various aspects of control of induction motors. The authors tried to make this book so easy to understand especially for the graduated and non graduated students. More than 50 Simulink circuits and 469 equations and 174 figures have been implemented to be as commence of the students to build their algorithms. Starting with an introduction about induction motor, part of the book dealing with control topics begins with vector control with high performance drive system and gives details about how to implement it, main parameters, Simulink implementation, vector control with encoder and without encoder is the main types of vector control in this book. Direct torque control principle with Simulink implementation. Scalar control either open loop or closed loop methods used in low performance drive systems are considered with Simulink implementation of each type. The modeling of the induction motor with all reference frames is introduced combined with induction motor modeling under stator open winding fault, stator short winding fault, broken rotor bar fault and modeling of induction motor under disturbance.
Quality Control of Technetium-99 Generator Quality Control of Technetium-99 Generator Новинка

Quality Control of Technetium-99 Generator

6426 руб.
Quality Control units should have well documented procedures for the implementation of Quality Control (QC), which should be undertaken for each starting material used in the production as well as for finished products. Quality Control (QC) measures of technetium-99m generator are necessary to ensure that it complies with all the requirements and specifications laid out for it. This book has been produced to meet the need expressed by nuclear medicine physicists and technologists for clear and detailed description of the quality control of technetium-99m generator. Giving attention to the quality control of radiopharmaceuticals in the nuclear departments will result in improving the diagnostic information, reducing the radiation doses to patients and staff, and reducing costs through effective use of radiopharmaceuticals.
SX460 AVR Generator Voltage Regulator Board - Black SX460 AVR Generator Voltage Regulator Board - Black Новинка

SX460 AVR Generator Voltage Regulator Board - Black

1886.65 руб.
Model SX460 Quantity 1 Color Black Material Plastic Features Great for DIY project. Specification Voltage establish: Automatically build pressure when remanence greater than 4V / 25Hz; Input power: AC 95~132V / AC 190~2645V 50/60Hz; Output voltage: DC 90V (When input AC 207V); Current: 4A (continuous) 6A 10s (instantaneous); Frequency compensation: Built-in engine when its speed drops decreases the frequency of the output voltage to protect circuit; Regulation: Better than 1% Application Pressure regulating English Manual/Spec Yes Packing List 1 x Board 1 x English user manual
Professional LED Voltage Alert Induction Test Pen - Blue + White + Grey Professional LED Voltage Alert Induction Test Pen - Blue + White + Grey Новинка

Professional LED Voltage Alert Induction Test Pen - Blue + White + Grey

384.7 руб.
Model W1207010 Quantity 1 Color Blue + White + Grey Material PVC casing Features Test before use Test voltage range: 90V-1000VAC Frequency range: 50~500HZ Buzzing alert Distinguish live wire and ground wire find out breakpoint Application Powered by 2 x AA 1.5V batteries (not included) Packing List 1 x Test pen

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DIY ZVS Tesla Coil Power Supply Boost Voltage Generator Drive Board Induction Heating Module Specification: Size: 74mm x 77mm Input voltage: DC 12V-30V Output: HVDC, About 800 times of input voltage Power requirements: Less than 12V 5A, above 15V 15A Operating frequency: 30kHz-50kHz adaptive Secondary parameters: 5T + 5T Feature: 1. Using military FR4-A material 1.6mm double-board circuit board, power line extra add tin and optimizes line width of MOS tube drive circuit. 2. Using two IRFP250N power field pipe, large current, small internal resistance, super-power. 3. Using 1.25 copper wire large inductance, more stable performance. 4. Using 1% precision metal film resistors. 5. Use 25 * 24 * 16mm thick anti-static cooling. 6. Using MKP 0.33UF 1200V two parallel resonant capacitor for high frequency. Precautions: 1. After finish the installltion, carefully check it and verify that all components soldered correctly 2. Please note that the positive and negative signs of input power, carefully check to prevent reverse burning plate 3. The test voltage is recommended for the low power 12v, prevent mis-wiring problems or cause burning plate 4. Drive board limit input is DC 30v, current 10A, not recommended using limits, do not long working under overvoltage and overcurrent conditions. Driver board is not suitable for induction heating, if you need induction heating, it is recommended input voltage 15v or less. For induction heating or long use high-power must need to add the cooling fan, if poor heat dissipation, it will result in MOS tube temperature is too high, will accelerate the aging of MOS tube even burn and other issues. Note: This is a DIY kit, you need to have electronic knowledge and ability. Package includes: 1 x ZVS Tesla Coil Power Supply Boost Voltage Generator
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