Field leakage study and possible ways of improving compression generator parameters

Summary form only given. This paper deals with a traditional design of a compression generator suggested by V. Kuchinsky and B. Larionov of Efremov Institute of Electrophysical Apparatus (Saint Petersburg, Russia) in the invention registered in Russia in 1980, but with some addition in design for improving of operating characteristics. The author proposes to insert additional conductors (active or passive) in the slots of windings to reduce the magnetic flux leakage in the slot area. The improvement of generator parameters may be achieved due to concentration of magnetic flux to be compressed in the more thin area of air gap between rotor and stator, with corresponding reduction of minimal inductance of generator and increase of energy amplification, which is likely to increase the flux compression stage at the linear magneto-cumulative generators. Numerical simulation of the field in the slot area has been undertaken to study the effectiveness of proposed way of parameters improvement. Two contradictory points of view may be found in this topic. According to the first one, it is effective enough to dispose the electromagnetic shields (active or passive ones) along the sides of slot to reduce the flux leakage at the slot area and to displace the resulting magnetic flux to the gap. Using passive shields appears to be a simpler resolution of the problem. According to the second point of view, it would be better to increase the quality of electric circuit of the generator due to enhancement of main winding cross-section instead of mounted shields. The numerical simulation has been performed to define which points of view are closer to the truth. The pictures of the magnetic flux distribution were obtained using the finite-elements simulating program created by Dr. Igor Petuhov at the Institute of Electrodynamics. The effectiveness of electromagnetic shielding of the flux leakage in the slot area has been proved.