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 15 of 15 for “"hysteresis loss"”.
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Output Capacitance Loss Measurement and Validation for Low-Voltage Silicon and GaN Devices in DC-DC Converter Applications
… that these converter topologies can help achieve loss-less switching in a power device. However, this theory is not completely true as there even with soft-switching there is some degree of loss associated in the form of output capacitance-related hysteresis loss, channel turn-off loss, and loss …
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Characterization of MnZn ferrite materials and finite element method for MnZn ferrite core loss calculations
… work presents the method of calculating the core loss in ferrite cores by using a linear and sinusoidal finite element solver based on the material property data (the complex permeability, the dielectric constant, and the AC conductivity) measured in the laboratory. Due to the lack of published …
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The development and application of the load-stroke hysteresis technique for evaluating fatigue damage development in composite materials
… experimental method was developed to measure the hysteresis loss during a fatigue test from the load and stroke signals of a standard servo-hydraulic materials testing system. The method was used to characterize changes in properties and performance induced by long-term cyclic loading. Advantages …
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Copper, Aluminum and Nickel: A New Monocrystalline Orthodontic Alloy
… (α= 0.05) was used to compare elastic moduli and hysteresis. To identify significant differences, Tukey post-hoc comparisons were performed. <strong>Results: </strong>The modulus of elasticity, deflection forces, and hysteresis profiles of CuAlNi were significantly different than the other …
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Thermally activated dislocation motion including inertial effects in solid solutions
… obstacles. However, it is shown that a hysteresis loss which occurs for both segregated and nonsegregated obstacles also contributes to the bias stress effect. Bias stress data are obtained that indicate the significance of the hysteresis loss contribution to the bias stress effect. …
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Magnetic analysis of nuclear pressure vessel steels and other ferromagnetic materials subject to neutron irradiation and heat treatment
… coercivity, remanence, permeability, and hysteresis loss were measured as a function of a variety of irradiation and annealing exposures. The results were interpreted in terms of dislocation and magnetic domain wall pinning mechanisms and internal stress relaxation. It is found that the …
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Stress dependence of the magnetic properties of steels
… the material or component of interest through a hysteresis cycle and plot the magnetic response on the B,H (magnetic induction, magnetic field) plane. The result is a hysteresis loop, a typical example of which is given in Figure 1.1. The figure also shows a number of parameters that are used to …
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Magnetothermal Modulation of Nerve Growth
… under applied AC magnetic fields (AMFs) exhibit hysteresis loss, which can activate heat-sensitive ion channels such as TRPV1. This magnetothermal modulation requires AMFs with peak field strengths of up to 40 kA/m and frequencies of up to 580 kHz. While air–gap magnetic cores can achieve the …
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Particle shape anisotropy and its effects in AlNiCo and Fe-Cr-Co magnet alloys.
… predictions for this mechanism.The rotational hysteresis loss and rotational hysteresis integral specify curling as the mode of magnetisation reversal in a Fe-Cr-Co alloy after heat treatment to produce the optimum magnetic state.The behaviour of remanence and coercivity for Alcomax 111 and an …
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Design, analysis and prototyping of a high speed surface mounted permanent magnet machine
… Analysis (FEA) software. The estimation of core losses in high-speed machines is also of critical importance during electromagnetic design. An immense amount of research has been conducted on the estimation of core losses in machines, however, not much has been done to cover the estimation of …
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Magnetic properties measurement of new magnetic material : SOMALOY 700 (5P)
… and engineers are aiming for the lower loss magnetic material in order to obtain the high efficiency of the electrical machines. Magnetic properties of soft magnetic material have been actively studied under 1-D and 2-D magnetic flux excitations to estimate the total core loss produced …
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Mitigation of Remanence Flux in Power Transformers using Predetermined Method of De-Energization
… to the point that stray flux, eddy current, hysteresis loss and harmonic loss (embodied and represented within the non-linear Rₚ element and known as “core Watt losses”) have all attained significant improvements witnessed by their 99.8+ percent efficiency. The difficulties that remain are …
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Electromagnetic-thermal Characteristics of Conductor on Round Core (CORC) Cables
… capacity while reducing alternating current (AC) losses. They are promising candidates for low-loss power transmission and low-inductance high-field magnets. This thesis carries out exhaustive research on the electromagnetic-thermal characteristics of CORC cables, and a charging method for a CORC …
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Self-bearing motor design & control
… the design and experimental demonstration of hysteresis self-bearing motors, novel segmented stator structures, MIMO loop shaping control algorithm for levitation and commutation, hysteresis motor analysis including frequency dependency, nonlinear hysteresis model including loop widening, and …
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PCB-Based Heterogeneous Integration of PFC/Inverter
… of its power handling capability. The winding loss is proportional to the magnetomotive force (MMF), which is Ni. That is to say, with the number of layers (turns) and currents increased, winding loss is increased nonlinearly. Furthermore, for a large-size planar inductor, flux distribution is …