Mostrando recursos 1 - 20 de 586

  1. Note: Fast compact laser shutter using a direct current motor and three-dimensional printing

    Zhang, Grace H.; Braverman, Boris; Kawasaki, Akio; Vuletic, Vladan
    We present a mechanical laser shutter design that utilizes a direct current electric motor to rotate a blade which blocks and unblocks a light beam. The blade and the main body of the shutter are modeled with computer aided design (CAD) and are produced by 3D printing. Rubber flaps are used to limit the blade’s range of motion, reducing vibrations and preventing undesirable blade oscillations. At its nominal operating voltage, the shutter achieves a switching speed of (1.22 ± 0.02) m/s with 1 ms activation delay and 10 μs jitter in its timing performance. The shutter design is simple, easy...

  2. Design of an unknown input observer to enhance driver experience of electric power steering systems

    Reichhartinger, M; Spurgeon, SK; Weyrer, M
    Electric power steering (EPS) systems assist the driver during manoeuvres by applying an additional steering torque generated by an electric motor. Although there are many advantages for electric actuated steering systems including fuel efficiency, they are known to deteriorate the feel of the steering as experienced by the driver. This paper presents a sliding mode observer based estimation concept which provides signals to evaluate and improve perception and feel of the steering as experienced by the driver. The proposed strategy is based on a physically motivated dynamic model of a power steering system and the measurements considered are typically available...

  3. Design Principles for Energy-Efficient Legged Locomotion and Implementation on the MIT Cheetah Robot

    Seok, Sang Ok; Wang, Albert D; Chuah, Meng Yee; Hyun, Dong Jin; Lee, Jongwoo; Otten, David M; Lang, Jeffrey H; Kim, Sangbae
    This paper presents the design principles for highly efficient legged robots, the implementation of the principles in the design of the MIT Cheetah, and the analysis of the high-speed trotting experimental results. The design principles were derived by analyzing three major energy-loss mechanisms in locomotion: heat losses from the actuators, friction losses in transmission, and the interaction losses caused by the interface between the system and the environment. Four design principles that minimize these losses are discussed: employment of high torque-density motors, energy regenerative electronic system, low loss transmission, and a low leg inertia. These principles were implemented in the...

  4. Remote Adaptive Motor Resistance Training Exercise Apparatus and Method of Use Thereof

    Reich, Alton; Shaw, James
    The invention comprises a method and/or an apparatus using a computer configured exercise system equipped with an electric motor to provide physical resistance to user motion in conjunction with means for sharing exercise system related data and/or user performance data with a secondary user, such as a medical professional, a physical therapist, a trainer, a computer generated competitor, and/or a human competitor. For example, the exercise system is used with a remote trainer to enhance exercise performance, with a remote medical professional for rehabilitation, and/or with a competitor in a competition, such as in a power/weightlifting competition or in a...

  5. The Pilatus Unmanned Aircraft System for Lower Atmospheric Research

    Schmid, Beat; de Boer, Gijs; Trussel, Cameron; Long, Charles N.; Maslanik, James; Mack, James; LoDolce, Gabriel; Fromm, Joshua; Palo, Scott; Gao, Ru-shan; Argrow, Brian; Bland, Geoff; Hock, Terry; Telg, Hagen
    This paper presents details of the University of Colorado (CU) "Pilatus" unmanned research aircraft, assembled to provide measurements of aerosols, radiation and thermodynamics in the lower troposphere. This aircraft has a wingspan of 3.2 m and a maximum take-off weight of 25 kg, and it is powered by an electric motor to reduce engine exhaust and concerns about carburetor icing. It carries instrumentation to make measurements of broadband up- and downwelling shortwave and longwave radiation, aerosol particle size distribution, atmospheric temperature, relative humidity and pressure and to collect video of flights for subsequent analysis of atmospheric conditions during flight. In...

  6. Direct torque control of five-leg inverter-dual induction motor powertrain for electric vehicles

    Tabbache, Bekheïra; Douida, Sofiene; Benbouzid, Mohamed; Diallo, Demba; Kheloui, Abdelaziz
    International audience

  7. Yaw moment Lyapunov based control for In-Wheel-Motor-Drive Electric Vehicle

    Laghmara, Hind; DOUMIATI, Moustapha; Talj, Reine; Charara, Ali
    International audience

  8. Initial Study on Fault Tolerant Control with Actuator Failure Detection for a Multi Motor Electric Vehicle

    Santos, Bruno,; Araújo, Rui,
    Part 7: Control and Fault Tolerance

  9. 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.

  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. 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.

  12. Model-Based Design Approach to Predict Performance of BAS/Electric Motor for OSU EcoCAR 3 Vehicle

    Engelman, Michael
    In today’s society, there is growing concern over the state of the global climate and the impact that we have on it. Scientists and engineers are seeking ways to meet energy demands and emissions regulations around the world by creating more sustainable and energy efficient technologies. In the automotive industry, this can be evidenced by the advent of hybrid electric vehicles. The Ohio State University EcoCAR 3 team based at the Center for Automotive Research is converting a 2016 Chevrolet Camaro into a plug-in hybrid electric vehicle with the end goal of improving fuel consumption and emissions whilst maintaining the...

  13. Using Motorettes for the Experimental and Numerical Determinations of the PDIV in an Electric Motor

    Rain, Pascal; Loubeau, Florian; Durieux, Anne; Le Strat, Florence; Fresnet, François
    International audience

  14. Understanding the Thermal Degradation of 3-layer Insulating Papers for Electric Motor

    Rain, Pascal; Loubeau, Florian; Durieux, Anne; Poitrinet, Jean-Luc; Le Strat, Florence; Fresnet, François
    International audience

  15. Solar electric motor on superconducting bearings: design, producing and potential applications

    Berger, Kévin; Boufatah, Fawzi; Menana, Hocine; Linares-Lamus, Rafael-Antonio; Hinaje, Melika; Douine, Bruno; Lévêque, Jean
    International audience

  16. Propulsion Wheel Motor for an Electric Vehicle

    Winn, Ross Briant; Weber, Steven J.; Farrell, Logan Christopher; Vitale, Robert L.; Guo, Raymond; Junkin, Lucien Q.; Bluethmann, William J.; Rogers, James Jonathan; Waligora, Thomas M.; Herrera, Eduardo; Figuered, Joshua M.; Eggleston, IV, Raymond Edward; Lee, Chunhao J.
    A wheel assembly for an electric vehicle includes a wheel rim that is concentrically disposed about a central axis. A propulsion-braking module is disposed within an interior region of the wheel rim. The propulsion-braking module rotatably supports the wheel rim for rotation about the central axis. The propulsion-braking module includes a liquid cooled electric motor having a rotor rotatable about the central axis, and a stator disposed radially inside the rotor relative to the central axis. A motor-wheel interface hub is fixedly attached to the wheel rim, and is directly attached to the rotor for rotation with the rotor. The...

  17. Understanding the Thermal Degradation of 3-layer Insulating Papers for Electric Motor

    Loubeau, Florian; Rain, Pascal; Durieux, Anne; Le Strat, Florence
    International audience

  18. Using Motorettes for the Experimental and Numerical Determinations of the PDIV in an Electric Motor

    Loubeau, Florian; Rain, Pascal; Durieux, Anne; Le Strat, Florence; Fresnet, François
    International audience

  19. Remote Adaptive Motor Resistance Training Exercise Apparatus and Method of Use Thereof

    Shaw, James; Reich, Alton
    The invention comprises a method and/or an apparatus using a computer configured exercise system equipped with an electric motor to provide physical resistance to user motion in conjunction with means for sharing exercise system related data and/or user performance data with a secondary user, such as a medical professional, a physical therapist, a trainer, a computer generated competitor, and/or a human competitor. For example, the exercise system is used with a remote trainer to enhance exercise performance, with a remote medical professional for rehabilitation, and/or with a competitor in a competition, such as in a power/weightlifting competition or in a...

  20. RECONSTRUCTION OF EXISTING LIVESTOCK FEED PRODUCTION PLANTS BY ADDING A HYDRAULIC ADDER

    D. Kiš; T. Jurić; N. Voća; Duška Čurić; M. Mandurić
    Recipes determine the quality of livestock feed and the hydraulic adders are one of the elements determining if the given recipe will be carried out. Generally, construction of existing adders does not allow accomplishment of that aim i.e. they do not meet recipe requirements. Consequently, researches which determined deviations in ingredient adding present with existing adders and with the experimental hydraulic adder were conducted. The research was conducted for two years (2005 and 2006) in two livestock feed factories in the Republic of Croatia on samples of feed mixtures for pigs weighing up to 15 and 25 kilos. Relative error...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.