Mohammad Hosein Khanzade


  Iran University of Science and Technology

  Electrical Engineering Department

  PhD. Defense Session


  Dynamic Modeling of Helical Flux Compression Generators  


  Magnetic flux compression generators offer the largest pulsed power output per unit size or weight when compared with other more conventional systems. These generators are capable of producing voltages of tens kV and currents of tens to hundreds MA.

  The variety types of flux compression generators have been developed and tested during the past five decades. The most successful types of them , is the helical flux compression generator which is capable of producing a high energy output into large impedance loads, just as it is needed for a practical pulsed power source.

  In this thesis, we have modeled the helical flux compression generator, using the tow-dimensional filamentary method. The state equations of the generator have been solved by using an approach, which is based on the dynamic matrix concept .

  The most important source of the losses in a helical flux compression generator is the flux loss due to turn skipping phenomenon (flux that is left behind the conductors and lost for compression). A method has been introduced to calculate this loss. In addition, this work also presents an approach for modeling the eddy current effects in helical flux compression generators accurately. This approach based on the filamentary method in the frequency domain .

  Due to eddy current effects, the resistances of a helical flux compression generator are frequency dependent. Therefore, it is important to consider a proper frequency in calculation of them. On the other hand, this generator is a pulsed device and its operating frequency can not be determined explicitly. It is usual that these parameters are calculated at an averaged frequency approximately but we have introduced an equivalent frequency and a method for calculation it.

  To verify our modeling and simulations, experimental models of helical flux compression generator were built and tested. The simulation results demonstrate a good agreement with the experiment results.

  Student: Mohammad Hosein Khanzade  

  Supervisors : Dr. Abbas Shoulaie, Dr. Yousef Alinejad

  Refrees: Dr. Mojtaba Mirsalim, Dr. Sadegh Vaezzade, Dr. Homayoon Oreizi, Dr. Heydarali Shayanfar, Dr. Alireza Jalilian

  Date of defense: July 4, 2010, 10 a.m.

  Location: Seminar room





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