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.
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Showing 1 to 20 of 34 for “"Current sensors"”.
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Vibration and crack detection in gas turbine engine compressor blades using Eddy current sensors
(cont.) in the ECS signal, no definitive method for sensing blade vibration using an ECS has yet been developed.
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PCB-Embedded Phase Current Sensor and Short-Circuit Detector for High Power SiC-Based Converters
… bandwidth, high performance Rogowski coil switch current sensors are employed. These sensor were embedded on the PCB and integrated on the gate driver. High bandwidth switch current sensor measurement is used for fast short-circuit detection and protection of the SiC MOSFET semiconductor switches. …
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Automatic sensor fault diagnosis and controller reconfiguration for induction motor drives sensor fault-tolerance
… normally incorporates position sensor, phase current sensors, de-link voltage sensor and de-link current sensor. In this research, a sensor fault-diagnosis and fault-tolerance scheme for IM drives is presented that will allow IM drive system to operate properly in the event of sensor …
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The Effects Of Electrode Geometry On Current Pulse Caused By Electrical Discharge Over An Ultra-fast Laser Filament
… electrical discharge was measured using fast current sensors. Significant differences in the time dependence of the current were seen with the two electrode geometries used. Using sharp-tipped electrodes additional peaks in the time-resolved conductivity were seen, relative to the single peak …
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A CMOS-based Hartmann-Shack Sensor for Real-Time Adaptive Optical Applications
… calculation of the wavefront. The bandwidth of current sensors is mostly limited by software processing of the focal plane image to some tens of Hz, which makes it unsuitable for real-time adaptive optical systems. To overcome the current bandwidth limitations a fast Hartmann-Shack sensor based …
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Building a wireless mesh networked real-time electricity metering system in an MIT dormitory
… rooms. The meters utilized Allegro Hall Effect current sensors as well as ZigBee based mesh networking transceivers. A remote database stored energy use data for the community and implemented data and graph caching for an online web interface made available to the system users. The website …
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Power Density Optimization of SiC-based DC/AC Converter for High-Speed Electric Machine in More/All-electric Aircraft
… aerospace EMI standard DO-160 and bearing current limitations. Electric aircraft demand unmatched reliability, necessitating strict control over EMI noise and bearing currents. These considerations significantly impact the selection of topology and parameters to maximize power density. This …
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Compensação de temperatura para sensores de corrente elétrica baseados em redes de Bragg em fibras ópticas
… of temperature compensation for electrical current sensors based on fiber Bragg gratings using the twin gratings technique. The measurement of electric current by opto-mechanical sensors is very well described in the literature, as well as techniques that propose the compensation of thermal …
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Minimally intrusive strategies for fault detection and energy monitoring
… techniques employed in this thesis require fewer sensors because they take a different approach to the measurement problem. Specifically, these techniques use the power distribution network in the target system as a power source, a sensor array, and a communications channel. In this "multi-use" …
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Vibration detection in turbomachinery using non-contacting sensors
… have seen the introduction of multiple Eddy Current Sensors (ECS) into turbomachinery. These sensors employ an active magnetic field to monitor each blade as it passes the sensor. They generate an electrical signal proportional to the distance of a blade from the sensor. Existing algorithms …
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Control of a fast steering mirror for laser-based satellite communication
… on the FSM comes from two different set of sensors. On power up, the FSM's angular position is controlled with feedback from local position sensors (KAMAN eddy current sensors). Optical feedback is accomplished with a laser beam and quad cell optical sensor. The optical sensor has an …
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Multi-Sensor, Fused Airspace Monitoring Systems for Automated Collision Avoidance between UAS and Crewed Aircraft
… the pilot in command's visual line of sight is currently restricted due to a lack of cost-effective surveillance sensors robust enough to operate in low-level airspace. The current sensors available either have have high accuracy of locating targets but are too short of a range to be usable or …
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Sensorless Control of a Bidirectional Boost Converter for a Fuel Cell Energy Management System
… cost through topology changes and elimination of current sensors. A dual 2.5kW non-isolated bidirectional boost converter is designed and analyzed. The various bidirectional boost topologies are compared on cost and ability to meet the specifications. A sensorless average current mode is designed, …
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Optimum Control for Minimization of Torque Ripple in Synchronous Reluctance Machines
… the machine, magnet flux density distribution, current harmonics and non-idealities in position and current sensors. Harmonic orders and magnitudes of torque ripple developed due to various sources are analyzed. A new control strategy considering saturation is proposed for Synchronous Reluctance …
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Optimization of thermoplastic composite manufacturing with digital process intelligence
… resolution data across hundreds of shop-floor sensors. Since this effort began, scrap rates for the targeted product dropped 85%. We also describe experiments probing composites behavior during thermoforming; by monitoring parameters including pressure, temperature, cooling rate, and …
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Modeling and Control of a Single-Phase, 10 kW Fuel Cell Inverter
… final system is implemented without the use of current sensors, thus keeping the inverter cost down. Experimental results using a power supply are given for resistive, inductive, and nonlinear loads and the performance is acceptable. Fuel cell test results, including transient response, are also …
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Integrated Current Sensor using Giant Magneto Resistive (GMR) Field Detector for Planar Power Module
… power modules have limited application for high-current operation, mainly because of their poor thermal management capability. Planar power modules have excellent thermal management capability and lower parasitic inductance, which means that the planar packaging method is desirable for high-power …
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Tactile sensor design optimization for footwear applications from piezoresistive elastomer to Hall-effect integrated sensing methods
… analysis and medical devices. However, current plantar sensing technologies are unable to meet the associated demands for accuracy, sensitivity, and durability. In addition, current sensors are also unable to withstand the large impact forces and inertial noise associated with human …
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Development and Implementation of Laboratory Test Methods for the Evaluation of Wearable Head Impact Sensors
… unstudied groups, wearable head impact sensors have reached nation-wide popularity for their promising benefits to consumers and researchers. However, there are risks in relying on such technology before proper validation of its performance has been completed. Preliminary tests have …
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Modeling and Control of a Six-Switch Single-Phase Inverter
… performance is demonstrated without expensive current sensors or high sampling frequency.
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