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Nomenclatura Unesco > (33) Ciencias Tecnológicas > (3306) Ingeniería y tecnología eléctricas > (3306.03) Motores eléctricos

Mostrando recursos 1 - 20 de 1.010

1. Línea experimental de manipulación de fruta con el objetivo de mejorar elementos mecánicos para reducir daños. - Ortiz-Cañavate Puig-Mauri, Jaime; Ruiz Altisent, Margarita
Ha sido diseñada e instalada en el Departamento de Ingeniería Rural de la Universidad Politécnica de Madrid una línea experimental de manipulación de fruta con el objetivo de mejorar elementos mecánicos y condiciones de manipulación para reducir daños a la fruta. La línea experimental consta de varias cintas transportadoras, un transportador de rodillos, un calibrador de diábolos, un elevador, un alineador y tres bandejas de salida para la fruta calibrada. La línea tiene una longitud de 6.15 m y una anchura de 1.9 m. Los diferentes elementos de la línea están accionados por motores eléctricos con velocidad variable controlada electrónicamente....

2. Diseño de un sistema de carga y descarga de energía eléctrica para vehículos eléctricos de alto desempeño - Martínez Martínez, Wilmar Hernán
Uno de los grandes inconvenientes de la movilidad eléctrica en Colombia es la baja densidad de potencia que presentan los vehículos autónomos. Esto se debe a que la mayoría de fabricantes diseñan sus vehículos para países con terrenos estables y de bajo relieve. Por esta razón, esta investigación muestra el diseño de los diferentes subsistemas eléctricos de un vehículo eléctrico de alto desempeño con alta densidad de potencia y cuya primera aplicación es correr un cuarto de milla en 10 segundos, con el fin de demostrar las capacidades de los vehículos eléctricos y posteriormente ser la base de vehículos eléctricos...

3. The Impact of Three Different Canal Lubricants on Fracture, Deformity and Metal Slivering of ProTaper Rotary Instruments - Shantiaee, Yazdan; Dianat, Omid; Sharifi, Farnoud; Nahvi, Golnaz; Kolahi Ahari, Golbarg
Introduction: The aim of this in vitro study was to evaluate the effect(s) of three canal lubricants i.e. sodium hypochlorite, RC-Prep as the paste form of ethylenediaminetetraacetic acid (EDTA) and aqueous EDTA on the occurrence/incidence of fracture, deformity and metal slivering of ProTaper rotary instruments. Methods: A total of 120 mesial canals (i.e. mesiobuccal and mesiolingual) of first mandibular molars or buccal canals (i.e. mesiobuccal and distobuccal) of first maxillary molars, with curvatures of 10-20 degrees were selected and randomly divided into three groups of forty samples each. These selected canals all had approximate 19-21 mm working length and apical...

4. Estudio de la vibración en baja frecuencia de motor eléctrico - Pérez Pozo, Pablo; Bermejo Campos, Víctor
Se realizará un análisis en baja frecuencia del comportamiento de sistemas vibratorios excitados principalmente por un motor eléctrico. El sistema está formado por un motor eléctrico acoplado a un volante de inercia que produce una carga sobre citado motor diferente según las configuraciones adoptadas, todo ello montado sobre una base metálica de acero, soportada esta, mediante resortes de diferente características. El estudio contemplará la identificación de frecuencias de excitación, resonancias, pérdidas de inserción de los sistemas, transmisibilidad, problemas de alineamiento, desajustes, modos propios... para cada una de las diferentes situaciones en las que opera el sistema. ABSTRACT. In this Project will proceed...

5. The automobile; a practical treatise on the construction of modern motor cars, steam, petrol, electric and petrol-electric. Based on Lavergne's "L'automobile sur route". Edited by Paul N. Hasluck. - Lavergne, Gérard, 1854-
Special ed. enl., with 804 illus., 8 full-page plates and an addendum.

6. Electric motor control systems and methods; a collection of practical diagrams and descriptions of the many methods employed, by Henry C. Horstmann and Victor H. Tousley - Horstmann, Henry Charles, 1858-
3 p. l., 9-371 p.

7. Disseny d'un motor d'engegada directe - Vidal Martínez, Albert
El següent projecte tracta del disseny d’un motor elèctric d’engegada directe.Es parteix de la potència, la velocitat de sincronisme i la freqüència. Amb aquestes dades es realitza primer un càlcul analític com a motor asíncron d’inductància i posteriorment se li afegeixen imants permanents, la qual cosa el converteix en síncron, i s’analitza magnèticament mitjançant programes d’elements finits per trobar-ne la força electromotriu i les inductàncies directa i de quadratura.L’ objectiu principal d’aquest projecte és trobar un motor amb el cosinus de fi, és a dir, el factor de potencia igual o molt pròxim a 1. Amb això s’aconsegueix l’engegada directe...

8. Hybrid Wheel-Legged Robot Mechanism for Search and Rescue Missions and Outdoor Surveillance - Sajjad Yaghoubi
Abstract-- This Robot is a highly mobile robotic system which was developed for outdoor surveillance, remote inspection and security missions in complex environments. The robot can negotiate difficult terrain, overcome obstacles and climb stairs. Robotic drones can support first responders in dangerous situation and provide video stream and sensor information in real time. This robot can carry up to 5kg of payload and can be equipped with multiple application sensors depending on the scenario and type of the mission. The hybrid legged-wheel design helps to the robot to climb stairs and keep the center of mass low on obstacles. Each...

9. Mechatronics Design of Small Electric Vehicles; Research and Education - Farhan A. Salem
Abstract-- This paper proposes mechatronics design of small electric vehicles (SMEV), including Mechatronics design, modeling, simulation and integration of accurate sub-systems and overall system models. the proposed design and models can be used to select, integrate, analyze and validate Mechatronics deign process of SMEV and its sub-systems; including mechanical system, control system, components and electrical energy, resulting in simplification, acceleration and increasing accuracy of design. The proposed overall system model can be modified to include any control strategy and/or any electric machine (motor), where the motor and its associated driving power circuit and /or controller can be replaced with different...

10. ANALYSIS OF BIPOLAR PWM FUNCTIONS USING DISCRETE COMPLEX FOURIER TRANSFORM IN MATLAB - Dobrucký B; Beňová M; Marčoková M; Šul R
Abstract. The paper deals with the discrete complex Fourier transform which has been considered for both three- and two phase orthogonal voltages and currents of systems. The investigated systems are power electronic converters supplying alternating current motors. Output voltages of them are strongly non-harmonic ones, so they must be pulse-modulated due to requested nearly sinusoidal currents with low total harmonic distortion. Modelling and simulation experiment results of halfbridge matrix converter for both steady- and transient states are given under substitution of the equivalence scheme of the electric motor by resistive-inductive load and back induced voltage. The results worked-out in the...

11. Experimental Evaluation of a Batch Hot Air Fluidized Bed Dryer - Oluwaleye I. O; Adeyemi M. B
Abstract: The experimental evaluation of a batch hot air fluidized bed dryer for cassava particles is presented. The test rig of fluidized bed dryer consists of a vertical column 400mm diameter with a physical height of 2960mm, a regulated centrifugal blower powered by a 1.5 Hp electric motor, and an air heater with a thermostat for selection of drying temperature of the fluidizing medium. A bed of 1.555kg casssva particles were fluidized at three different air flow rates: 043 kg/s, 0.05 kg/s and 0.056 kg/s in succession. The drying temperatures considered are at an interval of 20 o C. The...

12. A Structural Empirical Model of R&D, Firm Heterogeneity and Industry Evolution,” Working Paper - Yi Xu
This paper develops and estimates a dynamic industry equilibrium model of R&D, R&D spill-overs, and productivity evolution of manufacturing plants in the Korean electric motor industry from 1991 to 1996. Plant-level decisions for R&D, physical capital investment, entry, and exit are integrated in an equilibrium model with imperfectly competitive product market. Estimates of the structural parameters explains observed heterogeneity in plant R&D choice, size, and turnover, and quantifies how R&D and R&D spill-overs drive the change of plant productivity and industry structure. Given the structural estimates, I study an important policy question: how does product market competition affect individual firm...

13. Modeling and Simulation of an Electric Scooter Driven by a Single-Phase Induction Motor - C. Sukcharoen; T. Kulworawanichapong
Abstract:- An electric vehicle driven by DC motors has been widely used for several applications. In this paper, replacement of the DC motor by a single-phase induction motor on the electric vehicle is proposed. Low cost and less maintenance make the single-phase induction motor more impressive although a complicated inverter onboard the vehicle is required. This paper investigates this possibility through a whole system of electric vehicle movement simulation. The whole system simulation consists of three main parts: 1) power supply interface 2) motor performance calculation and 3) vehicle movement simulation. The electric scooter of 0.26 kW rating was employed...

14. Preparación de sinterizados para deposición de capas superconductoras de alta temperatura - de Arriba Bodelón, Sara
100 años después del descubrimiento de la superconductividad por el físico holandés Heike Kamerlingh Onnes, los superconductores ya se usan en múltiples aplicaciones y se prevé que jueguen un papel fundamental en las tecnologías del futuro próximo en campos tales como la energía, el medio ambiente, el transporte, la nanotecnología y la salud. Actualmente, se están realizando grandes avances en el procesado de cintas superconductoras a gran escala con el fin de aplicar este fenómeno a cables de conducción eléctrica, motores, generadores, transformadores… Con esto, se conseguiría un notable incremento de la eficiencia energética ya que, por ejemplo, los cables...

15. Numerical Simulation of a Batch Fluidized Bed Dryer - I. O Oluwaleye; M. B. Adeyemi; S. B. Adeyemo
Abstract:- The numerical simulation of drying cassava particulates in a batched fluidized bed dryer was undertaken. The dryer consists of a vertical column 400mm diameter with a physical height of 2960mm. A regulated centrifugal blower that generated air flow at three different flow rates (.043 kg/s, 0.05 kg/s and 0.056 kg/s) to fluidize a bed of cassava particulates in turn was powered by a 1.5 Hp electric motor. The air flow was heated by a regulated electric heater to predetermined drying temperature of 120 o C. The mass of cassava particulate fed into the dryer per batch is 1.555kg. One...

16. Design And Testing Of 3-Phase Converter Applicable To Four Quadrant Operation - B. Ramu; G. Suresh Babu
It is needless to say that four quadrant principle plays a vital role in industrial applications.Running a machine both in motoring and generating action illustrates the four quadrant operation. In electric locomotives, the motor may run clock wise and anti clockwise, and the torque may act either with or against the direction of rotation. In other words the speed and torque may be positive or negative. An attempt is made in this paper to demonstrate this principle by designing the required converter. Here, converter performs dual function i.e. both as rectifier (AC to DC) and inverter (DC to AC) Though...

17. Transdesign Of A Three Phase Squirrel Cage Induction Motor - O. A. Akinsanya
Transdesign is the process of converting an idea that has already been used into another one by adding compensation or removing an information in order to modify it to suit a particular purpose. This paper presents the redesign concept as a radical method of revamping a dead electric motor back to usefulness. Data for this paper was got from direct measurement of parameter of a 2.5Hp discarded induction motor, while additional data were obtained from secondary sources. Combining the measured parameter with the assumed empirical constant, the wire guage was found to be 27 while the number of conduction/slot/phase was.66.With...

18. METHOD OF OPERATION AND CALIBRATION OF THE MECHANICAL COMPACTOR
Prior to handling test materials, performing equipment setups, and/or conducting this method, testers are required to read “SAFETY AND HEALTH ” in Section F of this method. It is the responsibility of the user of this method to consult and use departmental safety and health practices and determine the applicability of regulatory limitations before any testing is performed. A. SCOPE This method describes the procedures for operation and calibration of the mechanical compactor used for fabrication stabilometer, moisture vapor susceptibility, and swell specimens of treated or untreated soils and bituminous mixtures. press principle in connection with an electric motor, a...

19. Design and Development of Energy Efficient Lift-(Prototype) - Kailash Bhosale; S. B. Kharde; S. R. Thorat
Abstract — Means of vertical transportation, for both people and other loads, have been employed by mankind since ancient times.In early agricultural societies, these devices relied on men, animal or water power to lift the load. Rudimentary rope and pulley arrangements were used to support and move the required weight. The Industrial Revolution brought with it a number of technological advancements. Machine power allowed for fast developments and safety systems were introduced. In 1880, the first electric motor was used to power a lift. Led by ever growing needs in the industry, with the necessity of moving great amounts of...

20. Using a fingertip tactile device to substitute kinesthetic feedback in haptic interaction,” Haptics: Generating and Perceiving Tangible Sensations - Domenico Prattichizzo; Claudio Pacchierotti; Stefano Cenci; Kouta Minamizawa; Giulio Rosati
Abstract. A prototype of a joystick where the kinesthetic feedback is substituted by tactile feedback is proposed. Tactile feedback is provided by a wearable device able to apply vertical stress to the fingertip in contact with the joystick. To test the device, rigid wall rendering is considered. Preliminary experiments show that the sensation of touching a virtual wall using the force feedback provided by the electric motor of the joystick is nearly indistinguishable from the sensation felt by the user using the tactile display only. The proposed device does not suffer from typical stability issues of teleoperation systems and is...

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