Mostrando recursos 1 - 20 de 1.740

  1. A First Look at Electric Motor Noise For Future Propulsion Systems

    Henderson, Brenda S.; Envia, Edmane; Huff, Dennis L.
    Motor tone predictions using a vibration analysis and input from design parameters for high power density motors show that the noise can be significantly higher or lower than the empirical correlations and exceeds the stated uncertainty.

  2. Motor monofasico de polos sombreados.Estudio cuantitativo y comparativo (Parte 1)

    Gallo, Omar D.; Ferreyra, Diego Martín; Díaz, Alberto Javier
    This is a study performed on several shaded-pole induction motors to be applied on the same home appliance. It consists of the following:Approximate reproduction, by means of a dynamometer, of their normal operating conditions under nominal load in order to retrieve and assess their input and output parameters and their temperaturesGathering of their manufacturing details; computing, comparing and assessing the requirements placed on their active componentsGraphing characteristic curves for their operation, and computing the parameters derived from themThe purpose is basically to contribute additional information to the knowledge of this kind of motors.

  3. Programa para el cálculo de las eficiencias electromecánicas en equipos de bombeo de pozo profundo (EFEL 1.0)

    Delgado Ramírez, Gerardo; Rivera González, Miguel; Trucíos Caciano, Ramón; Estrada Ávalos, Juan; Catalán Valencia, Ernesto Alonso
    The cost for electrical energy in the agricultural sector accounts for about 30 percent of the production costs of the primary product, due to the extraction of groundwater for irrigation of fodder crops. Therefore, it is convenient to evaluate periodically the electromechanical efficiency of pumping equipment with the aim of improve the relationship between the energy consumed and the volume of water extracted. The aim of this work was to develop software that determines the electromechanical efficiency, based on the methodology proposed by the NOM-006-ENER-1995. This is about energy efficiency electromechanical equipments for deep well pumping operation, which is applicable for submersible pumps and with external motor. The program also calculates the...

  4. Diseño y construcción de un TURBOEJE

    Escobar Garzón, Arnold; Cabrera, M.; Ramírez, F.; Zapata, J.
    El enfoque de esta investigación va dirigido al diseño y construcción de un motor a reacción, el cual utiliza su potencia para accionar un eje conectado a un generador eléctrico. Este motor, llamado turboeje, usa gas natural como combustible dando la alternativa de una producción más limpia y reducción de costos en la generación de electricidad en aproximadamente un 70% en comparación con los proveedores convencionales.

  5. La evolución tecnológica del disco artificial según la Teoría del ciclo de vida del producto

    Barberá Tomás, José David
    La Teoría del Ciclo de Vida del Producto (en adelante, TCVP) caracteriza el cambio tecnológico que experimenta un producto a lo largo de su ciclo de vida como una secuencia de variación-selección. Las fases iniciales del ciclo de vida de un producto están caracterizadas por una gran variedad tecnológica, debido a que existe una alta incertidumbre respecto a las prestaciones de las diferentes soluciones tecnológicas propuestas. Sin embargo, esta incertidumbre se reduce con el tiempo, y esta reducción provoca que, en fases más maduras del ciclo de vida, de toda esta variedad tecnológica existente en el mercado emerja un único...

  6. Diseño y cálculo de reductor de velocidad para aplicación industrial

    CARPINTERO CABRERA, JORGE
    [ES] El objeto del proyecto, como reza el título, es el diseño de un reductor para actuar de forma automática una puerta rápida industrial, de forma que su accionamiento sea rápido, comandado por un motor eléctrico, lo que permite que pueda ser comandada de forma automática. La puerta rápida que se considera es un modelo flexible (tipo Crawford) tanto en usos interiores como exteriores. Se trata de puertas de alta eficiencia operativa empleadas extensivamente en zonas de muelles de carga y zonas refrigeradas donde ayudan a ahorrar energía. Van accionadas por un motor con convertidor de frecuencia que ayuda a aumentar la fiabilidad de las mismas, con arranques y...

  7. Diseño de un reductor de velocidad con relación de velocidades 11,1 y par en el eje de salida120 N·m

    FAYOS VIDAL, VICTORIA
    El objetivo del proyecto es desarrollar un reductor de velocidad de engranajes cilíndricos helicoidales accionado por un motor eléctrico con una velocidad de entrada de 2800 rpm, un par de salida de 120Nm y con una relación de transmisión de 11,1. El diseño se realizará en base a criterios de mínimo espacio y coste garantizando una alta fiabilidad.

  8. Detección de fallos en el rotor en motores de inducción arrancados mediante arrancadores estáticos

    CORRAL HERNÁNDEZ, JESÚS ÁNGEL
    [ES] El objeto de este TFG es extender una nueva metodología de diagnóstico de averías en máquinas eléctricas rotativas, basada en análisis transitorio de corrientes y anteriormente desarrollada por el grupo de investigación al que pertenece el profesor director, al diagnóstico de roturas de barras en el rotor de motores asíncronos arrancados mediante arrancadores estáticos. La citada metodología ha sido aplicada con éxito durante estos últimos años al diagnóstico de roturas de barra y otras averías electromecánicas en motores de inducción, los motores eléctricos más utilizados en el ámbito industrial.

  9. Diseño de reductor de 100 Nm de par de salida y relación de velocidades 11.1

    MARTÍNEZ BENITO, IVÁN
    [ES] Este proyecto tiene como objeto el diseño de un reductor de velocidad de dos etapas industrial. Su finalidad será disminuir la velocidad en el árbol de entrada aumentando el par en el árbol de salida. Los requisitos del proyecto son:  Velocidad del árbol de entrada: 3000 r.p.m.  Par torsor en el árbol de salida: 100 N·m  Relación de transmisión: 11.1 La función del reductor de velocidad es transmitir potencia que se obtiene del motor eléctrico, hasta el árbol de salida ya que el motor eléctrico no podrá ser aplicado directamente debido a:  Escaso par que proporciona.  Elevada velocidad de giro.

  10. Investigating the trade-offs involved in augmenting a DC brushless motor with an active heat sink in order to improve performance.

    Browne, Deron Adriel
    This thesis seeks to establish solutions to the issue of electric motor heating and the problems it presents for use of these motors in biomechatronic applications. As electric motors are used, their windings heat up and the resulting temperature limits torque. Larger motors may be used to obtain more torque, but this adds undesirable weight to the devices in which they are used. Cooling methods also exist, but do not necessarily consider suitability to bionic applications. This thesis therefore aims to improve the torque output of a given motor by effectively removing heat while minimizing the addition of mass. I...

  11. Desarrollo eléctrico de un sistema de microgeneración eólica

    Oliveros Rubio, Pablo
    En la actualidad existe una necesidad energética mundial muy alta. Se tiene conocimiento de que 1300 millones personas no tienen acceso a la energía y 2700 millones de personas extraen energía de la biomasa tradicional, que favorece el deterioro gradual del medio ambiente por la emisión de gases. En el marco del primer grupo, dado que los países a los que pertenecen estas poblaciones poseen habitualmente rentas per-cápita bajas no disponen de capacidad económica suficiente para realizar instalaciones eléctricas o de generación complicadas y tecnológicamente avanzadas. La consecuencia de su escaso o nulo acceso a la energía provoca que su...

  12. Solar Electric Motor on Superconducting Bearings: Design and Tests in Liquid Nitrogen

    Berger, Kévin; Boufatah, Fawzi; Linares-Lamus, Rafael-Antonio; Menana, Hocine; Hinaje, Melika; Douine, Bruno; Lévêque, Jean
    The authors would like to thank Isabelle Schwenker for its help during the setup of the experimental parts. We are also grateful to Mariusz Stepien and Boguslaw Grzesik for organizing in 2014 the visit of the Silesian University of Technology where we have seen such a solar motor for the first time.

  13. *Corresponding author

    Kanghyun Nam; Hiroshi Fujimoto; Yoichi Hori
    Design of an adaptive sliding mode controller for robust yaw stabilisation of in-wheel-motor-driven electric vehicles

  14. IOS Press Efficient method for eddy current analysis in permanent magnets of electric motors

    Michal-wolfgang Waszak
    Abstract. This paper presents an efficient method for eddy current analysis in permanent magnets (PM) used in electric machines. Due to appreciable electric conductivity of sintered PM the energy losses related to induced eddy currents cannot be neglected. Since the resulting increase of temperature may weaken the magnetomotive force or even demagnetize the PM material. Two numerical approaches for eddy current calculations in massive materials are commonly applied: 2d model (assuming infinite axial length) and 3d model (usually suffering from numerical inefficiency). In this paper we discuss numerically efficient method for eddy current computation taking actual axial length into account....

  15. XML Template (2011) [7.11.2011–10:56am] [1–9] K:/PIC/PIC 428398.3d (PIC) [PREPRINTER stage] Original Article


    A hybridization design of an air motor and an electric motor based on field programmable gate array controller Shih-Yao Huang and Yean-Ren Hwang Among the elements of developing electric vehicles, the battery is usually the weakest point, as well as the most expensive component. If the battery life is too short, the frequently replacement of the battery is necessary, which will increase the overall cost. This article presents a novel hybridization design and implementation of an air motor and an electric motor which utilizes magnetic powder brake to integrate these two motors together. In this research, by the use of...

  16. Analysis of Soft-switching Converters for Switched Reluctance Motor Drives for Electric Vehicles

    Tze Wood Ching
    Two new soft-switching converters for switched reluctance motor drives are proposed and analyzed. The pro-posed zero-voltage-transition (ZVT) converter possesses the definite advantages that both main transistors and diodes can operate with zero-voltage switching (ZVS), as well as unity device voltage and current stresses. On the other hand, the proposed zero-current-transition (ZCT) converter offers the advantages that both the main and auxiliary switches operate with zero-current switching (ZCS), as well as minimum current and voltage stresses. Both converters have the merits of simple circuit topology, minimum component count and low cost. Keywords soft-switching converters, switched reluctance motor drives, electric vehicle propulsion...

  17. Dry-mixed Mortar Control System Based on Fieldbus and PLC

    Huan Zhang; Shuqi Shang; Linong Gong; Chuanhui Huang; Chuanhui Huang
    Abstract. A design of dry-mixed mortar control system based on Fieldbus and PLC was introduced in this paper. A scheme of totally integrated automation, which includes S7-300 PLC, PROFIBUS-DP Fieldbus, touch panel and etc., was proposed. Firstly, control demands and process of this system were described; secondly, hardware configuration and software design were illustrated as well. By using large-scale PLC and field level network- PROFUBUS-DP, the motions of electric motor actuators or hydraulic cylinder actuators are running well, and all sections in the process flow, like hoist, well-distributed vibration, mixing, unloading, etc can all be implemented in time and in...

  18. Circuit design for an intelligent dustbin controlled by gestures

    Huachun Zhou
    our movement and then compete corresponding task according to our willing. To make the intelligent machine more acceptable to human life, and to develop an intelligent dustbin which controlled by gestures will realize interactions between human and intelligent dustbin. This article introduced the hardware circuit design of the intelligent dustbin. Block scheme of the intelligent dustbin The block scheme of the intelligent dustbin is illustrated in Figure 1. Zigbee is used to receive the control command; CC2530 is used to control motors, vacuum cleaner and switch cover; Ultrasonic sensor is used to detecting and avoiding obstacles; Gas sensor is used...

  19. Electric Model of Li-Ion Polymer Battery for Motor Driving Circuit in Hybrid Electric Vehicle

    Wansoo Nah
    Abstract – This paper presents an equivalent circuit model of a LIPB (Li-Ion Polymer battery) for Hybrid Electric Vehicles (HEVs). The proposed equivalent circuit can be used to predict the charging/discharging characteristics in time domain as well as the impedance characteristic analysis in frequency domain. Based on these features, a one-cell model is established as a function of Depth of Discharge (DoD), and a 48-cell model for a battery pack was also established. It was confirmed by experiment that the proposed model predict the discharging and impedance (AC) characteristics quite accurately at different constant current levels. To check the usefulness...

  20. A NET-CHANGING MECHANISM FOR THE LOWESTOFT MULTIPURPOSE SAMPLER By

    D. Harding; E. Shreeve; D. S. Tungate; D. Mummery
    A net-changing device for use with the Lowestoft multipurpose sampler is described. The unit consists of four nets mounted on stainless steel rods which are spring loaded and slide between stainless steel runners. The nets are held by metal "fingers " when not fishing, and by operating an electric motor they can be released instantaneously to the fishing posi-tion. Water enters the net through a standard nose cone via a trumpet-insert of fibreglass. The amount of water filtered is registered by an electric flowmeter mounted in the nose cone, and the depth at which the sample is taken is recorded...

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