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 40 for “"Skin effect"”.
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Skin effect resistance ratio of a circular loop of wire
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1929.
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Crystalline topological phases: Bulk-boundary correspondence, geometric response, entanglement, and non-Hermitian skin effect
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Microprocessor based protection of induction motors using thermal, mechanical, and skin effect electrical models to predict motor temperature rise
… conditions. The model accounts for the rotor bar skin effect as the motor speed changes. Motor losses, computed using the electrical model, are fed to a thermal model. Stator, rotor, and core temperatures are calculated. Thermal limit curves are presented. Protection strategies are investigated. A …
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Three-dimensional analytical model with skin effect dedicated to the prediction of the eddy current loss in the permanent magnet in permanent magnet synchronous machine
In this thesis, we develop a 3-D analytical model for the eddy current loss in the permanent magnet for a permanent magnet synchronous machine with a rated power of 1 MW and an efficiency of 97%. In order to achieve an ambitious power density of 8 hp/lb, which is twice the state-of-the-art value, …
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Augmented Surface Integral Equation Method for Low-Frequency Electromagnetic Analysis
… including the low-frequency breakdown, the skin effect, and the substrate effect, have been addressed for full-wave electromagnetic analysis in the low-frequency regime, especially the modeling of electrical interconnects on chip and package levels. The augmentation technique is a simple and …
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Effect of harmonics on the efficiency of a three phase energy efficient and standard motors
… standard motors (STMs). In this research, the skin effect impedance model that incorporates the skin effect in the rotor bars is used to study the motor’s behavior under harmonics. The characteristic behavior of the motors are simulated using a computer program which compares the performance, …
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Particle-In-cell simulations of nonlocal and nonlinear effects in inductively coupled plasmas
The kinetic effects in an inductively coupled plasma (ICP) due to thermal motion of particles modified by self-consistent magnetic fields are studied by using a particle-in-cell (PIC) simulation. In the low pressure, low frequency regime, electron mean free paths are large relative to device size …
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Integrated Circuit Substrate Modeling for Noise Analysis
… frequency-dependent case, where electromagnetic effects such as displacement current and skin effect cannot be assumed negligible, has been argued and demonstrated in this dissertation.
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Small -Signal Distributed FET Modeling
… focuses on developing a distributed field-effect transistor (FET) small-signal model that is accurate from do to 110 GHz for a wide range of bias conditions. The distributed model is intended to be compatible with a large-signal implementation. The distributed model performance is compared …
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A Comparison of three phase induction motor performance subjected to frequency, voltage, and load changes by PWM and square wave inverters
… advanced electrical model that accounts for the skin effect in the rotor bar to predict motor impedance is used to predict motor performance and calculate motor losses. The laboratory and calculated data are compared. Various performance characteristics of the induction motor are plotted. The …
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Pulsed field of a magnetising coil wound with a solid conductor of rectangular cross-section
… call conductor and the changed impedance due to "skin-effect". By assuming this distribution and changed impedance applies for the N-turned coil volume, the effects of eddy current losses are approximated inside the call. Results of comparing field calculations with several analytical field …
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A scanning tunneling microscope control system with potentiometric capability
… in the X and Y directions. This use of the skin effect should allow the end user to obtain slices of the surface at various penetration levels of the specimen. These slices will give a picture of what happens from the surface up to a certain penetration depth. The interpretation of these …
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Modeling, analysis, and design of high-frequency high-density low-profile power transformers
… and energy storage in transformer by taking the skin effect, proximity effect, and edge effect into account. The characteristics of winding arrangements (interleaved or sandwiched, balanced or unbalanced) with different types of wire (solid wire, Litz wire, and printed wire) are accurately …
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Efficient and physically consistent electromagnetic macromodeling of high-speed interconnects exhibiting geometric uncertainties
… wires, and to frequencies high enough that the skin effect is well developed and a surface impedance condition suffices to capture the frequency dependence of the wire resistance and inductance due to the skin effect. Second, we investigate ways in which the computational cost of enforcing …
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On-chip Spiral Inductor/transformer Design And Modeling For Rf Applications
… Later author will point out the in-adequacy of skin effect and proximity effect as cause of current crowding in the inductor metal. A model method embedded with new explanation of current crowding is proposed and its applicability in differential inductor and balun is validated. This study leads …
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Integral Equation Methodologies for the Signal Integrity Analysis of PCB and Interconnect Structures in Layered Media From DC to Multi-Ghz Frequencies
… media, as well as the efficient modeling of the skin effect loss inside the metalization. The aforementioned difficulties are addressed effectively in this thesis through the following contributions. A fast iterative solver based on the low-storage CG-FFT algorithm is combined with the loop-tree …
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Induction Motors With Rotor Helical Motion
… motion. The linear motion generates dynamic end effect on both linear and rotary armature. Modeling such an effect in rotary armature is a significant challenge as it requires a solution considering motion with two degrees of mechanical freedom. In other words, the rotor in the model would have …
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RF Models for Active IPEMs
… structure are derived. The influence of skin effect and proximity effect on AC resistances and inductances is also investigated at high frequencies. To investigate RF models and EMI performance of the IPEM, a 1kW 1MHz series resonant DC-DC converter (SRC) is designed and fabricated in …
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Modeling aperture radiation for RF interference applications
… moments(MoM) solution to evaluate the shielding effectiveness of a metallic enclosure with apertures on top wall by formulating a pair of coupled mixed potential integral equations (MPIEs). Application of Ewald transform to the computation of Green's function in the cavity yields fast convergence …
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Rigorous Electromagnetic Modeling of Conductor and Substrate Losses for High -Speed Interconnect Structures
… associated with the rigorous modeling of the skin effect, model order reduction techniques based on Krylov projections and balanced realizations are used to reduce the global surface impedance model. The reduced model is then used in an integral equation statement of the magneto-quasi-static …
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