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 18 of 18 for “"core losses"”.
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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 …
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Customisable Magnetic Components Using Nanocrystalline Flake Ribbon
… magnetic components with reduced losses, compact dimensions, lighter weight, and cost-effectiveness. Traditional methods for core customisation are cumbersome, time-consuming, and costly when producing small series of magnetic cores. Recently developed magnetic cores customised …
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A heat transfer finite element model of a high speed DC electric motor
… heating in the motor winding elements and iron core losses in the stator laminations. The two-dimensional axisymmetric model is preprocessed using a two dimensional mesh generator. Results are postprocessed with a two-dimensional contour plotting routine and compared to experimental results. …
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Low temperature manufacturing of ferrite-epoxy inductor cores by micro-robotic deposition
… the inductive properties, and the magnetic cores used to enhance those properties. Power losses associated with these devices can also be categorized by these two components called copper and iron losses, respectively. Iron losses, or core losses, are highly dependent on the materials used …
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Magnetic properties measurement of new magnetic material : SOMALOY 700 (5P)
… current electrical machines require the magnetic cores to operate at higher frequency to meet the demand of high–speed performance in catching up the aggressive technological evolution. On top of that, the researchers and engineers are aiming for the lower loss magnetic material in order to obtain …
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Design Methodology for an Ultra-High Efficiency Coreless Resonant Power Transformer
Coreless resonant power transformers, operating at high frequency, have several advantages over the traditional iron core transformer. They have a simple structure, are lighter, cheaper, and more efficient due to the elimination of core losses. For a given cooling capacity, pushing the efficiency …
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Influence of Mechanical Loading and Temperature on the Magnetic Properties of FeCo-2V Soft Magnetic Alloy
… accumulation increases coercivity and hysteresis losses, providing a clear mechanism for the degradation observed in mechanically strained magnetic materials. In situ magnetic testing under uniaxial stress revealed a stress-dependent response: moderate tensile stress enhanced magnetic performance, …
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Design, analysis and implementation of a spoke-type motor with high-performance ferrite magnets for electric vehicle applications
… of mechanical, anti-demagnetization, torque, and core losses are simulated by ANSYS finite element software. A prototype with a peak power of 50 kW is finally designed and manufactured. The mechanical and electromagnetic analysis of the final design is carried out. The selection and design of …
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Super High-speed Miniaturized Permanent Magnet Synchronous Motor
… for super-high speed applications since motor losses assume a key role in the motor drive performance limit. The considerations of the PMSM structure for cryogenic applications are also discussed. It is shown that slotless structure with multi-strand Litz-wire is favorable for super-high speeds …
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Design optimisation of a slotless brushless permanent magnet DC motor with helically-wound laminations for underwater rim-driven thrusters
… tend, therefore, to have a very thin back of core and narrow teeth, which make them expensive and difficult to manufacture. This thesis proposes an alternative motor topology featuring a toothless stator whose laminations are manufactured from a single strip of steel that is edge wound into a …
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Design and steady-state analysis of the switched reluctance motor drive
… an analytical method for determining the core losses of the SRM. Considerable effort is also dedicated to the design and analysis of new and old SRM converter topologies with particular attention to the criteria governing the choice of converter topology, the prediction of key waveforms, …
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Development of Iron-Based Soft Magnetic Composites with Novel Coating Materials
… to replace steel laminations as the magnetic core material used in electric motors. The main advantage of SMCs is their isotropic magnetic properties, allowing for radically different design concepts as compared to the 2-dimensional magnetic properties of steel laminations. If this key …
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Comparison of interior permanent magnet synchronous machines for a high-speed application
… to their torque, magnetic field, airgap flux, core loss, efficiency, and cost. The radial IPM produces a smoother torque output, with lower torque ripple, and has lower losses compared to the circumferential IPM which produces a higher torque and power output. Furthermore, the circumferential …
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Composite Nanoparticle Materials for Electromagnetics
… replacement for conventionally used magnetic core materials in various electromagnetic applications. Conventional linear and rotary electric motors, generators and actuators are too bulky to be used in lightweight applications. The major component of weight in electromagnetic devices is the …
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PCB-Based Heterogeneous Integration of LLC Converters
… three important challenges. First, the excessive core loss caused by the uneven flux distribution in planar magnetics, owing to the huge size and high-frequency operation of the core. These factors led to the observation of dimensional resonance within the core and an excessive amount of eddy …
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Development of high efficiency high speed permanent magnet generator
… and efficient design with lower excitation losses, magnetizing currents and rotor losses requires the HSPM generator to be operated at high rated speeds of approximately 30000 RPM. However, at high speeds these machines produce a substantial amount of heat. This makes the thermal management …
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Design and Integration Techniques for High-Frequency PCB-Based Magnetics in Resonant Converters
… PCB windings. Moreover, integrating the cellular cores using flux cancellation can further improve the power density. The proposed integrated magnetics can be automated in the manufacturing process. The magnetic size is reduced at this frequency, and planar magnetics using PCB winding become more …
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Methodologies for Design-Oriented Electromagnetic Modeling of Planar Passive Power Processors
… to increased power loss density in windings and core, with subsequent increase in device temperature, parasitics and electromagnetic radiation. An accurate set of reduced-order modeling methodologies is presented in this work in order to predict the high-frequency behavior of inductors and …