Direct On-line Rim-driven Electric Machines
... Figure 1.2: Aspect Ratio of a Conventional 4-pole Machine Compared to a Rim-driven 18-pole Machine..............................................................................................................34 Figure 1.3: Block diagram of the Motors Investigated within this Thesis.................. ...
... Figure 1.2: Aspect Ratio of a Conventional 4-pole Machine Compared to a Rim-driven 18-pole Machine..............................................................................................................34 Figure 1.3: Block diagram of the Motors Investigated within this Thesis.................. ...
PLASMA PHYSICS AND FUSION ENERGY
... Last, but most certainly not least, I would like to thank my wife Karen for her unending support and encouragement while I prepared the manuscript. She was also kind enough to proofread a large fraction of the text for which I am most grateful. ...
... Last, but most certainly not least, I would like to thank my wife Karen for her unending support and encouragement while I prepared the manuscript. She was also kind enough to proofread a large fraction of the text for which I am most grateful. ...
Elmer Models Manual
... The original copyright of this document belongs to CSC – IT Center for Science, Finland, 1995–2015. This document is licensed under the Creative Commons Attribution-No Derivative Works 3.0 License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nd/3.0/. Elmer program is ...
... The original copyright of this document belongs to CSC – IT Center for Science, Finland, 1995–2015. This document is licensed under the Creative Commons Attribution-No Derivative Works 3.0 License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nd/3.0/. Elmer program is ...
Appendix Part 1 - Free
... magnetic field having once been energised. Ferromagnetic materials with high coercivity are known as permanent magnets. Permanent magnets are capable of storing a finite amount of energy and retaining the ability to generate a substantial magnetic field until the stored energy is depleted. There are ...
... magnetic field having once been energised. Ferromagnetic materials with high coercivity are known as permanent magnets. Permanent magnets are capable of storing a finite amount of energy and retaining the ability to generate a substantial magnetic field until the stored energy is depleted. There are ...
Superconductivity
Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In ordinary conductors, such as copper or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.In 1986, it was discovered that some cuprate-perovskite ceramic materials have a critical temperature above 90 K (−183 °C). Such a high transition temperature is theoretically impossible for a conventional superconductor, leading the materials to be termed high-temperature superconductors. Liquid nitrogen boils at 77 K, and superconduction at higher temperatures than this facilitates many experiments and applications that are less practical at lower temperatures.