Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 91 for “"Electric motors"”.
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The commercial efficiency of small electric motors
… Institute of Technology, Department of Electrical Engineering, 1891
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Failure mechanisms of dielectric materials for electric motors
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2023-12-01
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Journal type bearings for electric motors, their design, construction, & lubrication
Thesis ()--Michigan State College of Agriculture and Applied Science, 1935
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Magnetisation of bulk superconductors for future light-weight electric motors
… leading towards light-weight, high power density electric motors to be used in future hybrid-electric passenger aircraft. One of the issues that needs to be addressed before this can become a reality, however, is the instability of trapped magnetic field in these materials, when exposed to …
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Thermosyphon-cooled axial gap electric motors for ship propulsion applications
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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Predictive Control of Electric Motors Drives for Unmanned Off-road Wheeled Vehicles
… for off-road environment. As the demand to use electric vehicles increased, the need to conceptualize the use of electrically driven vehicles in autonomous operations became a target. That is because in addition to the fact that they are more environmentally friendly, they are also easier to …
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Helical rail guns : the application of linear electric motors to aircraft launching
Thesis: B.S., Massachusetts Institute of Technology, Department of Physics, 1982
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Fast transfer path analysis using controlled electric motors as in-situ blocked force vibration sources
… inside the vehicle compartment induced by the electric power steering (EPS) system. Regarding noise, vibration and harshness (NVH), engineers require practical tools to assess, design and troubleshoot steering noise in vehicles. For acoustic development and refinement, test-based methodologies …
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Finite element simulation based design and optimization of electric motors for EV/HEV traction application
The launch of so many commercial electric vehicles shows the effort toward pollution reduction and curtailing greenhouse gas emissions. A design for an electric vehicle does not just requires the electrical system to be efficient in particular; but it is required to perform in all extreme cases of …
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A microcomputer-based data acquisition system for diagnostic monitoring and control of high-speed electric motors
… diagnostic monitoring and control of high-speed electric motors. The system was utilized in high-speed bearing life-testing, using an electric motor as a test vehicle. Bearing vibration and outer race temperature were continuously monitored for each ball bearing in the motor. In addition, the …
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Technological Development Trajectories of the Component Technologies in Battery Electric Vehicles
… about climate change grows, interest in battery electric vehicles (BEVs) is rising. BEVs are forecasted to constitute about 40% of passenger vehicle sales in 2035. While BEVs produce no emissions from the tailpipe, they face challenges, such as driving range and refueling time, that require …
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Overcoming electro-thermal barriers to achieve extreme performance power conversion for more electric aircraft
… has demonstrated growing interest in more electric aircraft (MEA) - flight vehicles where propulsion is partially or totally supplied by electric motors. While hybrid or turbo-electric MEA concepts would still rely on a jet engine power plant to provide electrical power to these electric …
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Real Time Estimation, Quantization, And Remote Control Of Permanent Magnet Dc Motors
<p>Establishing real-time models for electric motors is of importance for capturing authentic dynamic behavior of the motors to improve control performance, enhance robustness, and support diagnosis. Quantized sensors are less expensive and remote controlled motors mandate signal quantization. Such …
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Increasing Electric Machine Power Density With a New End-winding Cooling System
One of the key challenges for the electric vehicle industry is to develop high-power-density electric motors. Achieving higher power density requires efficient heat removal from inside the motor. For high performance electric motors, water-jacket cooling systems are usually used to remove heat …
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Optimum hybrid vehicle configurations for heavy duty applications
… has led to interest in the use of hybrid electric powertrains and the introduction of several production vehicles in both heavy-duty and light-duty applications. Hybrid electric vehicles (HEVs) use a combination of electric motor(s) and another power source such as an internal combustion …
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Investigating the trade-offs involved in augmenting a DC brushless motor with an active heat sink in order to improve performance.
… 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 …
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Adaptive control of nonlinear systems
… in areas as diverse as robotic systems, electric motors, chemical processes, and automotive suspensions. Many of the existing results employ design methods and proof techniques borrowed from the adaptive linear control literature. As a consequence, they impose linear growth constraints on …
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Characterization and analysis of an MRI compatible robot design for wrist psychophysics and rehabilitation
… actuation is accomplished with two standard electric motors, located outside the MRI chamber, which drive a non-ferrous, MRI compatible, low impedance hydraulic fluid transmission, consisting of two pairs of custom designed and fabricated vane motors. This thesis details the characterization …
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Design and Implementation of a Dual Axis Motor Controller for Parallel and Serial Series Elastic Actuators
… these actuators are custom designed and use electric motors, however most off-the-shelf electric motor drives are not designed for this specific application. In this paper, the hardware and software architecture of a control device designed specifically for force controlled series elastic …
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Flight Testing Small, Electric Powered Unmanned Aerial Vehicles
… to find the drag polar for small UAVs powered by electric motors with fixed-pitch propellers. Wind tunnel testing was used to characterize the propeller-motor efficiency. The drag polar was constructed using data from flight tests. The proposed methods were implemented for a small UAV. A drag …
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