Mostrando recursos 1 - 20 de 1.473

  1. Research Article Optimal Control Strategy Design Based on Dynamic Programming for a Dual-Motor Coupling-Propulsion System

    Shuo Zhang; Chengning Zhang; Guangwei Han; Qinghui Wang
    Copyright © 2014 Shuo Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. A dual-motor coupling-propulsion electric bus (DMCPEB) is modeled, and its optimal control strategy is studied in this paper. The necessary dynamic features of energy loss for subsystems is modeled. Dynamic programming (DP) technique is applied to find the optimal control strategy including upshift threshold, downshift threshold, and power split ratio between the main motor and auxiliary motor. Improved control rules are extracted from...

  2. Cokkinides, “Animation and Visualization of Spot Prices via Quadratized Power Flow Analysis

    A. P. Sakis Meliopoulos; Sun Wook Kang
    This paper presents a new model for efficient calculation of spot prices and animation and visualization of spot price evolution as the system operating point is changing. The computational method is based on the quadratized power flow approach that cast the power flow problem as a set of quadratic equations. The load model consists of constant power, constant impedance and induction motor loads. The electric load time variation is modeled via a small set of independent random variables resulting in a nonconforming electric load model. Constraints of voltage limits as well as circuit loading are imposed. For a specific load...

  3. Research Article Design and Experimental Evaluation of a Robust Position Controller for an Electrohydrostatic Actuator Using Adaptive Antiwindup Sliding Mode Scheme

    Ji Min Lee; Sung Hwan Park; Jong Shik Kim
    which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. A robust control scheme is proposed for the position control of the electrohydrostatic actuator (EHA) when considering hardware saturation, load disturbance, and lumped systemuncertainties and nonlinearities. To reduce overshoot due to a saturation of electric motor and to realize robustness against load disturbance and lumped systemuncertainties such as varying parameters andmodeling error, this paper proposes an adaptive antiwindup PID sliding mode scheme as a robust position controller for the EHA system. An optimal PID controller and an optimal anti-windup PID controller are also...

  4. Nelson, Andrew Lincoln: Characterization of Winding Faults in Axial Flux Reluctance

    Dr. Mo-yuen Chow
    Since the late 1980’s there has been a major resurgence in electric vehicle propulsion research and development. This trend has been stimulated by various factors, including rising fossil fuel costs, environmental concerns, and developments in technologies, such as improved permanent magnets, switching transistors and storage batteries. New technology has allowed motor types previously not suitable for use in electric vehicles, such as variable reluctance permanent magnet motors and brushless DC motors, to be adapted for use as electric vehicle propulsion systems. The process of motor fault detection and diagnosis is becoming an important part of electric motor applications, including electric...

  5. 1State of Charge Evolution Equations for Flywheels

    D. Fooladiv; G. Mancini; S. Garg; C. Rosenberg
    Flywheel energy storage devices are composed of a spinning composite disk in an low-pressure enclosure designed to contain the debris in the case of operation failure [18]. An electric motor-generator connector is used to convert the electric energy to kinetic energy by applying a torque on the flywheel. The torque can be positive (charge) or negative (discharge). The flywheel levitates over magnetic bearings in order to reduce friction. A cooling system must be used to remove the heat produced by

  6. Characterization of coil faults in an axial flux variable reluctance PM motor

    Andrew L. Nelson; Mo-yuen Chow; Senior Member
    switch–reluctance (SR) motors have been proposed for use in applications requiring a degree of fault tolerance. A range of topologies of brushless SR and VR permanent–magnet (PM) motors are not susceptible to some types of faults, such as phase–to–phase shorts, and can often continue to function in the presence of other faults. In particular, coil–winding faults in a single stator coil may have relatively little effect on motor performance but may affect overall motor reliability, availability, and longevity. It is important to distinguish between and characterize various winding faults for maintenance and diagnostic purposes. These fault characterization and analysis results...

  7. An all-electric single-molecule motor

    Johannes S. Seldenthuis; Ferry Prins; Joseph M. Thijssen; Herre S. J. Van
    Many types of molecular motors have been proposed and synthesized in recent years, dis-playing different kinds of motion, and fueled by different driving forces such as light, heat, or chemical reactions. We propose a new type of molecular motor based on electric field actu-ation and electric current detection of the rotational motion of a molecular dipole embedded in a three-terminal single-molecule device. The key aspect of this all-electronic design is the conjugated backbone of the molecule, which simultaneously provides the potential landscape of the rotor orientation and a real-time measure of that orientation through the modulation of the conductivity. Using...

  8. Topology Optimization of Electric Machines based on Topological Sensitivity Analysis

    P. Gangl; U. Langer
    Topological sensitivities are a very useful tool for determining opti-mal designs. The topological derivative of a domain-dependent functional represents the sensitivity with respect to the insertion of an infinitesi-mally small hole. In the gradient-based ON/OFF method, proposed by M. Ohtake, Y. Okamoto and N. Takahashi in 2005, sensitivities of the functional with respect to a local variation of the material coefficient are considered. We show that, in the case of a linear state equation, these two kinds of sensitivities coincide. For the sensitivities computed in the ON/OFF method, the generalization to the case of a nonlinear state equa-tion is straightforward,...

  9. PERFORMANCE ANALYSIS OF PI AND FUZZY LOGIC CONTROLLER IN A BLDC MOTOR FOR ELECTRIC POWER STEERING APPLICATION

    P Ranjidha; P Sumitha; J Indumathi; S Santhalakshmi
    Electric power steering (EPS) is an advanced steering system that uses an electric motor to provide steering assist. A Brushless DC motor (BLDC) find wide applications, due to their high power density and ease of control. To achieve desired level of performance, the motor requires suitable speed controllers. In this paper PI controllers are used as a closed loop controller for speed control of BLDC motor. This system is also analysed by using Fuzzy logic controller for better performance.The effectiveness of the system is verified through simulation results using control oriented simulator like MATLAB/Simulink Tools. The circuit operation, controllers design...

  10. DEVELOPMENT AND TESTING OF A RICE DESTONING MACHINE

    Agidi Gbabo; Ndagi Baba; Kuku Alhassan Mohammed; Abdullahi Lukman
    A rice destoner was developed locally for separating stone from milled rice. The major components of the machine includes: reciprocating screen and blower as well as hopper. The separation of stone is achieved by the vertical and horizontal oscillation of the reciprocating screen which as result of the forced air flow (produced by the blower) through the machine causes the rice kernels to float on a cushion of air just above the screen. This, then allows the reciprocating screen to convey the more dense stones up the screen to a discharge chutes, thereby ensuring the separation of the stones from...

  11. [676]

    Tribhuwan Singh; Shahzad Ali
    Research related to electrical vehicles is gaining importance due to the energy crisis. Using regenerative braking when braking, improves the efficiency of an electric vehicle as it recovers energy that could go to waste if mechanical brakes were used. A novel regenerative braking system for neighborhood electric vehicles was designed, prototyped and tested. The proposed system utilizes a seesaw system to capture energy whereas the conventional systems regenerate to the batteries. The user has direct control over the amount of current regenerated and hence the amount of negative torque applied for braking. The research has shown that the proposed regenerative...

  12. DESIGN AND ANALYSIS OF HIGH SPEED SWITCHED RELUCTANCE MOTOR FOR TWO DIFFERENT MATERIALS

    S Rajkumar; K Sedhuraman; Purimetla Santhi; A Joycy; Faustina Lourdes
    In aircraft electric motor driven fuel delivery system, the motor must be characterized by high power density, reliability, less size, less weight and high speed (Radun, 1992). The high speed operation, fault tolerance, high power density makes switched reluctance motor an ideal candidate for high speed aerospace applications. This paper investigates the application potential of soft magnetic composite material (SOMALOY 500) in high-speed switched reluctance motor. Two configurations: (1) all sheet metal with smooth frame and ribbed frame, (2) all Soft magnetic composite material with smooth frame and ribbed frame have been studied using finite element analysis to obtain their...

  13. SOCIOECONOMIC STATUS OF TRIBAL DAIRY ANIMAL OWNERS OF SOUTH GUJARAT REGION OF INDIA

    G P Sabapara; P M Desai; V B Kharadi
    collect the information on socioeconomic status of tribal dairy animal owners of south Gujarat region of India. Out of 95 villages in the Vansada taluka, twenty villages having functional primary milk producer's co-operative societies were selected at random. From each village ten dairy animal owners were randomly selected for filling the questionnaire related to the study. The analysis revealed that 69.00 % of the respondents were educated up to primary or above, 70.00 % were having big nuclear family, 99.00%were having social participation and 71.50 % were marginal farmer. Majority respondents follow mixed farming system in which agriculture + dairying...

  14. ELECTRONIC POWERED TURBO CHARGER

    N Chakravarthi; K Vijaya; Kumar Reddy; K P V Krishna Varma
    The new generation vehicles are designed with feasible engineering techniques by reducing their engine sizes and making them more power full and to maintain European standards thus by reduced engine there is an reduced power so the engines are equipped with the forced induction systems like turbo chargers and super chargers thus as an complete manually working turbo chargers gona work completely on a electric motor thus the turbo lags will be reduced drastically and doesn’t give any load to the engine thus our electric turbo works on the principle the electric motor fixed to the end of a impeller...

  15. SOCIOECONOMIC STATUS OF TRIBAL DAIRY ANIMAL OWNERS OF SOUTH GUJARAT REGION OF INDIA

    G P Sabapara; P M Desai; V B Kharadi
    collect the information on socioeconomic status of tribal dairy animal owners of south Gujarat region of India. Out of 95 villages in the Vansada taluka, twenty villages having functional primary milk producer's co-operative societies were selected at random. From each village ten dairy animal owners were randomly selected for filling the questionnaire related to the study. The analysis revealed that 69.00 % of the respondents were educated up to primary or above, 70.00 % were having big nuclear family, 99.00%were having social participation and 71.50 % were marginal farmer. Majority respondents follow mixed farming system in which agriculture + dairying...

  16. A Control Reconfiguration Strategy for Post-Sensor FTC in Induction Motor-Based EVs

    Bekheïra Tabbache; Nassim Rizoug; Mohamed El; Hachemi Benbouzid; Senior Member; Abdelaziz Kheloui
    Abstract—This paper deals with experimental validation of a reconfiguration strategy for sensor fault-tolerant control (FTC) in induction-motor-based electric vehicles (EVs). The proposed active FTC system is illustrated using two control techniques: indirect field-oriented control (IFOC) in the case of healthy sensors and speed control with slip regulation (SCSR) in the case of failed current sensors. The main objective behind the reconfiguration strategy is to achieve a short and smooth transition when switching from a controller using a healthy sensor to another sensorless controller in the case of a sensor failure. The proposed FTC approach performances are experimentally evaluated on a...

  17. Article: Modified Interactive Evolutionary Computing for Speed Control of an Electric DC Motor

    M. B. Anandaraju; Bgsit B. G. Nagara; P. S. Puttaswamy
    DC motors are important components of most of the process control industries. PID controllers are extensively used in DC motors for speed as well as position control. Tuning of PID controller parameters is an iterative process and needs an optimization to achieve the desired performance. In this paper a modified form of Interactive Evolutionary Computing (IEC) is used as the tool for achieving optimization of PID controller parameters for the speed control of DC motor. Different error models are used for optimization and a comparison with Genetic Algorithm based approach is presented.

  18. GLOBAL JOURNAL OFENGINEERINGSCIENCE ANDRESEARCHES DESIGN AND DEVELOPMENT OF QUDRASTEERING PROTOTYPE

    Somashekhar G Ganiger; Tushar V Sakore
    In this paper the method of design and development of a four wheel steering prototype is discussed, the prototype is a four wheeled chassis Structure, powered by electric motor. The prototype is capable to move on a surface having 30 degree slope with a velocity approximately 3kmph. The components of the system are designed and manufactured. The testing was carried out by keeping the wheel angle same, the variation of radius of curvature was noted. Keywords- Four-Wheel Steering, turning radius, radius of curvature, qudra wheel steering,wheel angle. I.

  19. PWM-Based Multilevel Cascaded Inverters Under Unbalanced DC Sources

    V. Gireesh; M. Ch; Ra Sekhar
    Abstract- This paper proposes pulse width modulation technique to get balanenced line to line out put voltage. in linearly modulation range maximize the modulation indeex,linearly varying out put voltage occurs. In the cascaded multilevel inverter(MLCI) operating under unbalanced dc link the linear modulation is reduced caused to voltage imbalance as voltage references increses. In order to analyze these effects, the voltage vector space for MLCI is evaluated in detail. From this analysis, the theory behind the output voltage imbalance is explained, and the maximum linear modulation range considering an unbalanced dc-link condition is evaluated. After that, a neutral voltage modulation...

  20. Performance Evaluation of Centrifugal Type Boiler Feed Pump by Varying Blade Number

    Ravindra Anandrao Thorat
    Abstract- Feed pumps are an essential subsystem of boilers used in industrial process plants and called as boiler feed pump (BFP). Normally, BFP is high pressure unit that takes suction from condensate return system and can be of the centrifugal type pump. In centrifugal pump, water enters axially through the impeller eyes and exits radially. Generally, electric motor is used as prime mover to run the feed pump. To force water into boiler, the pump must generate sufficient pressure to overcome steam pressure developed by boiler. In the present study, design and analysis of boiler feed pump having a flow...

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