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Showing 1 to 20 of 53 for “"sensorless"”.
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Sensorless adaptive optics in advanced microscopy techniques
… and pitfalls in the implementation of sensorless adaptive optics are examined and possible solutions are investigated. Optical systems that have been optimised in this way reduce the risk of photo-induced damage by reducing the necessary incident laser power and therefore improve sample …
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New Sensorless Permanent Magnet Synchronous Motor Drive
In permanent magnet synchronous motor (PMSM) drives, magnetic-saliency-based techniques have been widely used to detect rotor position and speed, especially during the starting and low-speed operations. Among these techniques, pulsating high-frequency signal injection (PHFSI) stands out as a …
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Sensorless starting of a brushless D.C. motor
… such as automotive and home appliances. A sensorless starting scheme for brushless DC motors is studied in this thesis. A hardware implementation of the starting scheme has been instrumented. The modeling and simulation of the sensorless starting performance of brushless DC motors have been …
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Fault Tolerant Sensorless Permanent Magnet Synchronous Motor Drives
… a three-phase, voltage source inverter-fed, sensorless motor drive can be made fault tolerant by acting mainly on the control strategy, thus keeping to a minimum the required hardware modifications and additions. After an initial classification of the possible faults which may affect …
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Sensorless temperature estimation and control of Peltier devices
Peltier devices, also known as thermoelectric devices (TEDs), are solid state junctions of two dissimilar materials in which heat transfer and electrical conduction are coupled. A current running through a TED causes heat to flow; likewise, the presence of an external temperature gradient will …
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Sensorless Wavefront Correction Algorithms for Free-Space Optical Communications
… to implement and further increase cost and SWaP. Sensorless wavefront correction algorithms, such as stochastic parallel gradient descent (SPGD), are preferable in terms of cost and SWaP, and have been used in FSOC terminals as methods to optimize the received signal strength indicator (RSSI). A …
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Position Sensorless Implementation for a Linear Switched Reluctance Machine
The development of an add-on sensorless position estimator for a 4.8 m Linear Switched Reluctance Machine (LSRM) with minimal modifications to the transducer-based controller is investigated for the first time in this study. LSRMs require position feedback for closed-loop control but present a low …
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Sensorless Control of Traction IPMSM Motor Drives for Electric Vehicles
L'abstract è presente nell'allegato / the abstract is in the attachment
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SENSORLESS CONTROL OF BRUSHLESS PERMANENT-MAGNET MACHINES FOR POWER TOOL APPLICATION
… there exists challenges to develop position-sensorless based vector control of PMSM operating in wide speed range covering both constant-torque and constant-power regions. The research objective is to maintain and improve its control robustness and adaptability to variations of operating …
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High Performance Sensorless Controlled PMSM Drive with Long Cable for Subsea Applications
… problems. This dissertation presents innovative sensorless control strategies for PM motors to address the complexities associated with subsea system components. These strategies address the full spectrum of operational speeds while considering the constraints imposed by the sinewave filter, …
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Direct Back EMF Detection Method for Sensorless Brushless DC (BLDC) Motor Drives
… reduce cost and complexity of the drive system, sensorless drive is preferred. The existing sensorless control scheme with the conventional back EMF sensing based on motor neutral voltage for BLDC has certain drawbacks, which limit its applications. In this thesis, a novel back EMF sensing …
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Speed sensorless field oriented control of ac induction motor using model reference adaptive system
… attention is required with electrical noises. Sensorless speed vector control is greatly used and applied in induction machine drives instead of scalar control and vector control for their robustness and reliability, and very low maintenance cost. In this project MRAS based techniques are used …
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Sensorless ultrasound probe 6DoF pose estimation through the use of CNNs on image data
… Convolutional Neural Networks (CNNs) to provide sensorless pose estimation. The Ultrasound CNN model proposed in this paper learns to regress the six degree of freedom (6-DoF) camera pose from a single ultrasound image in an end-to-end manner. Ultrasound images are easier to obtain than other …
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Sensorless Control of a Bidirectional Boost Converter for a Fuel Cell Energy Management System
… cost and ability to meet the specifications. A sensorless average current mode is designed, implemented and verified through testing in a low-cost fixed-point DSP. Both boost and buck modes are accurately modeled and voltage and current controllers are designed for good closed-loop response. The …
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Single-Phase, Single-Switch, Sensorless Switched Reluctance Motor Drive Utilizing a Minimal Artificial Neural Net
… by which drive designers can implement position sensorless drive technology that is both robust and easily implemented. It is demonstrated that a new and novel ANN configuration can be implemented for accurate rotor position estimation in a sensorless SRM drive. Consisting of just 4 neurons, the …
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Design of a Printed Circuit Board for a Sensorless Three-Phase Brushless DC Motor Control System
… This project outlines the design of a PCB based, sensorless motor controller for operation of a three-phase BLDC motor powered by a 24 V, high current external supply. Components used were selected to withstand an ambient temperature environment of 125 degrees C.</p> <p>The design for this PCB …
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Sensorless control of an interior permanent magnet synchronous motor with a three level t-type inverter
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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