M.Ing. / The robust and rigid construction of the reluctance machine makes it extremely useful for high speed applications e.g. in kinetic energy storage systems. Although its rigid construction offers, a degree of high reliability, its disadvantage is its low specific output power. In this dissertation a complete new concept is considered in which the output power of a reluctance machine is increased by 55% (rectangular current fed). The optimisation of the reluctance machine output power is achieved by forming the pole profile of the rotor. The conventional rectangular rotor pole profile is changed to a triangular rotor pole profile. A twelve phase rectangular current fed reluctance machine is used to test the validity of the theory. This is done by comparing theoretical predicted results and practical results. A strong resemblance between the results indicated that this theory is a good description of the reluctance machine. In the last chapter, behaviour predictions of the reluctance machine with a conventional rotor are compared with a formed pole rotor. The output power of these results indicate that the output power of a current fed reluctance machine, will increase by 55% when using an optimally formed pole profile rotor.

University of Macau / Faculty of Science and Technology / Department of Electromechanical Engineering

No description available.

Linear induction machines currently play a relatively minor role in the industrial world. This is partly due to relatively high production costs, complexity of construction and the Inability to apply standard mass production techniques. The aim of this thesis is to investigate the design of linear machines that are cheaper and faster to produce, and that may easily be mass-produced This thesis principally concerns the use of concentrated winding linear stators. These are cheap and easy to manufacture and can be easily mass-produced. However, high levels of negative harmonics make them unsuitable for use with simple sheet rotors.

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Thesis (M Electrical Eng)--University of South Australia, 1995

xiv, 171 p. ; ill. (some col.) A print copy of this title is available through the UO Libraries. Search the library catalog for the location and call number. / Biological molecular motors, which use chemical energy from ATP hydrolysis to generate mechanical force, are involved in a variety of important mechanical processes in eukaryotic cells, such as intracellular transport, cell division and muscle contraction. These motors, which produce motion on the nanoscale, operate in the presence of substantial thermal noise. In this dissertation, two approaches are used to model the physics of nanoscale motors: (1) A theoretically established type of Brownian motor called the "flashing ratchet" is studied. This motor transports diffusive particles in a preferred direction. (2) A coarse-grained mechanical model for the biological molecular motor myosin-V is developed, and used to study the role of Brownian diffusion, and the interaction between chemical and mechanical degrees of freedom, in the transport mechanism of this motor. In chapter III, Brownian dynamics simulations and analytical calculations demonstrate that the average velocity of rigid chains of particles in a flashing ratchet reverses direction in response to changing the size of the chain or the temperature of the heat bath. Recent studies have introduced policies for "closed-loop" control of a flashing ratchet, in which the system is controlled based on information about its internal state (such as the positional distribution of particles). In chapter IV, the effect of time delay on the implementation of closed-loop control of a flashing ratchet is investigated. For a large ensemble, a well-chosen delay time improves the ratchet performance (increasing the velocity) by synchronizing into a quasi-stable mode that takes advantage of the semi-deterministic nature of the time development of average quantities for a large ensemble. I n chapter V, a coarse-grained mechanical model is presented for the transport mechanism of myosin-V, which walks along intracellular filaments. The model is well constrained by experimental data on the mechanical properties of myosin V and on the kinetic cycle. An experimentally motivated model for the intramolecular coordination of the motor's steps is proposed and tested. / Adviser: Heiner Linke

No description available.

No description available.

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