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Search: WFRF:(Segergren Erik)

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  • Segergren, Erik, 1974- (author)
  • Direct Drive Generator for Renewable Power Conversion from Water Currents
  • 2005
  • Doctoral thesis (other academic/artistic)abstract
    • In this thesis permanent magnet direct drive generator for power conversion from water currents is studied. Water currents as a power source involves a number of constrains as well as possibilities, especially when direct drive and permanent magnets are considered. The high power fluxes and low current velocities of a water current, in combination with its natural variations, will affect the way the generator is operated and, flowingly, the appearance of the generator. The work in this thesis can, thus, be categorized into two general topics, generator technology and optimization. Under the first topic, fundamental generator technology is used to increase the efficiency of a water current generator. Under the latter topic, water current generators are optimized to a specific environment. The conclusion drawn from this work is that it is possible to design very low speed direct drive generators with good electromagnetic properties and wide efficiency peak.
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  • Segergren, Erik, et al. (author)
  • Relation between generator geometry and resistance in armature winding
  • 2006
  • In: Applied Energy. - : Elsevier BV. - 0306-2619 .- 1872-9118. ; 83:8, s. 884-892
  • Journal article (peer-reviewed)abstract
    • Resistive losses constitute a big part of the total loss in a generator, especially in low speed generators where frequency-dependent losses are low. The resistive losses in the winding are proportional to the length of the winding. In this paper, a computer-based program for generator design, using a two-dimensional finite-element method, is used to verify a theoretically-derived result, that the length of the armature winding is minimal for a specific generator geometry. A shorter armature winding might imply only a negligible improvement of the overall efficiency. The result of the computer-based design program is compared with the theoretically-derived results. A rough estimation of the relation between the length of the armature winding and the overall efficiency is included in the paper, as well as data from two existing generators.
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  • Result 1-18 of 18

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