Browsing by Author "El-Hasan, T. S."

Now showing 1 - 3 of 3
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    Rotor integrity design for a high-speed modular air-cored axial-flux permanent-magnet generator
    (IEEE Institute of Electrical and Electronics, 2011-09-30T00:00:00Z) Fei, Wei-Zhong; Luk, Patrick Chi-Kwong; El-Hasan, T. S.
    The rotor integrity design for a high-speed modular air-cored axial-flux permanent-magnet (AFPM) generator is presented. The main focus is on the mechanical parametric optimization of the rotor, which becomes a more dominating design issue over electromagnetic optimization at high operational speeds. Approximate analytical formulas are employed for preliminary sizing of the mechanical parameters of the rotor, which consists of the permanent magnets, retainment ring, and back iron. Twodimensional (2-D) finite-element analysis (FEA) models are used to optimize the values of the parameters. Then, 3-D FEA models are developed to verify the final design. Finally, based on the final design, an AFPM prototype is built for experimental validation, and mechanical integrity tests for the rotor are undertaken. The results confirm the validity of the analytical and FEA models, as well as the overall design approach.
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    Toward an intelligent high frequency AC distributed power system - Part I: conceptual design
    (Praise Worthy Prize, 2016-10-31) Luk, Patrick Chi-Kwong; El-Hasan, T. S.
    High frequency AC (HFAC) distributed power systems (DPS), where electric power is delivered at up to multi-kHz via cables, is an alternative means to conventional centralized power systems. When armed with on-line data, the HFAC DPS can perform intelligent management of power flow and lends itself to a host of emerging applications. The key enabling feature to realizing intelligent management in the DPS is the creation of a communication framework that allows the various sources and loads in the system to communicate their status seamlessly with each other. Whilst data communication over conventional power grid lines has been routinely implemented, there is remarkably no evidence of similar development in DPS where potential benefits would be significant. One key challenge is that DPS systems invariably operate at high frequency, thus squeezing allowable bandwidths for data. This paper explores the means by which real-time information can be achieved without installing additional physical communication channels on an existing 50 kHz current-fed HFAC DPS in lighting applications. A communication protocol is methodologically developed to facilitate robust and efficient inter-device real-time communication. The conceptual design of an intelligent HFAC DPS is proposed and the fundamental requirements and communication challenges of the modem are presented.
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    Toward an intelligent high frequency AC distributed power system - Part II: Analytical modelling and experimental realization
    (Praise Worthy Prize, 2016-12-31) Luk, Patrick Chi-Kwong; El-Hasan, T. S.
    High frequency AC (HFAC) distributed power systems (DPS), where electric power is delivered at up to multi-kHz via cables, is an alternative means to conventional centralized power systems. This paper explores the means by which real-time information can be achieved without installing additional physical communication channels on an existing 50 kHz current-fed HFAC DPS in lighting applications. A communication protocol is methodologically developed to facilitate robust and efficient inter-device real-time communication. In addition, analytical modelling for the current fed coupling circuit is presented. The utility of an intelligent HFAC DPS is demonstrated by experimental results from comprehensive circuit level implementation. Copyright © 2016 Praise Worthy Prize - All rights reserved.