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 10 of 10 for “"AC Machines"”.
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Improved reliability in solid-state drives for large asynchronous ac machines by means of multiple independent phase-drive units.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Vector controlled induction motor drive systems
… numerous industrial applications despite the fact that ac machines are robust, less expensive, and have low inertia rotors. The main disadvantage of the ac machines is the complexity in control and the cost of the related circuitry. With the advent of vector control, ac machines have overcome …
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Development of control techniques for direct AC‐AC matrix converter fed multiphase multi‐motor drive system
… applications, such as paper mills, locomotive traction, oil and gas, mining and machine tools, which require high performance control of more than one electric motor simultaneously. When more than one electric motors are employed in an electric drive, it is called, ‘multi‐motor drive’. These …
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An average modeling approach of hybrid power systems for use in mobile refrigeration applications
… for refrigeration units in delivery trucks. The background of the mobile refrigeration industry is stated, and the motivation of the proposed hybrid-powered ac motor drive is discussed. The model is intended to be used for an industry power and energy flow study and eventually for a development of …
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Estimation of rotor flux of an induction machine
… is organized as follows:Chapter 1 describes background information of the machines then it focuses on the methodology how on to approach the task on a particular time with the help of Gantt chart.Chapter 2 presents the basic principals of rotating magnetic field of the IM and asserts brief …
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Single stage boost inverter for standalone fuel cell applications
… is a promising technology that can be manufactured in South Africa because of the platinum catalyst required. South Africa is rich in platinum and, therefore, the PEMFC system can be cost-effectively produced. In residential stationary applications of the PEMFC a power conditioning system is …
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A novel concept of series connected multi-phase, multi-motor drive systems
… applications, such as paper mills, locomotive traction and machine tools, which require high performance control of more than one electric motor. These multi-motor drives are generally available in two configurations. The first one consists of a number of three-phase voltage source inverters …
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Variable air gap axial flux permanent magnet machine with mechanical field weakening
Field-weakening of electrical machines enables rotational speeds to exceed the rated values. This is particularly simple in some AC machines such as induction machines where the field strength magnitudes are determined hence controlled by a component of current in the stator windings. In …
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High-frequency, high-pole count design for improving specific power density of electric machines
… for improving specific power density of electric machines for weight and/or volume sensitive applications. Although electric machine designs have reached a limit in terms of efficiency, reliability, and cost, newer applications such as in aviation or the oil and gas industry are demanding …
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Time domain classification of transient RFI
… have been adopted by society. Many approaches have been developed for mitigating RFI, which are typically used in concert. New telescope arrays are often built far from human habitation in radio-quiet reserves. In South Africa, a radio-quiet reserve has been established in which several …