Preisach-type hysteresis modelling in Bi-2223 tapes
نویسندگان
چکیده
An identiication method for Preisach-type models of hysteresis is presented. By using a phenomenological Preisach-type model for hysteresis we can obtain an exact model for the magnetisation hysteresis in the cases of tapes with strip and with elliptical cross section geometries. With a parametrisation by Maclaurin series, it is possible to identify such a model for any other geometry. An additional advantage of this method is that the parameters are identiied from the measurements of energy losses per cycle. Finally the results of application of the modelling method to the case of a cuprate ceramic (Bi{2223) superconductor strip is presented.
منابع مشابه
Parametrised Preisach Modelling of Hysteresis in High Temperature Superconductors
We present a parametrised Preisach-type model that describes the hysteresis exhibited by the high temperature superconductors (HTSC); hysteresis is the main cause for losses in the subcritical domain. The parametrised model, in combination with electrical measurements, is independent of geometry, number of laments and other physical measures, and is identiied by a novel method that uses electri...
متن کاملObservation of vortex distribution in samples of Bi-2223 Ag-sheathed tapes with and without uranium doping by means of the high-resolution Bitter method
We examined the distribution of vortices in both Bi-2223 Ag-sheathed tape and U-doped Bi-2223 Ag-sheathed tape applying the high-resolution Bitter method. In the low temperature region ( ), we found that the vortices in the undoped Bi-2223 Ag-sheathed tape developed into either a triangular arrangement or a heterogeneous arrangement along the grain boundaries of the Ag sheath, which form weak p...
متن کاملControlled decomposition and reformation of the 2223 phase in Ag - clad ( Bi , Pb ) 2 Sr 2 Ca 2 Cu 3 Ox tapes and its influence on the microstructure and critical current density
The decomposition of almost fully reacted (Bi,Pb)2Sr2Ca2Cu3Ox (BSCCO-2223) tapes caused by heating in 1 atm of pure O2 at 825 C has been studied. It was found that partially decomposing 2223 tapes to a mixture of Bi2Sr2Ca1Cu2Oy, (Ca,Sr)2PbO4, and other secondary phases reduced the critical current density (77 K, 0 T) from ~20 kA/cm to nearly zero. Reheating the tapes in 7.5% O2 restored the 222...
متن کاملEffect of various mechanical deformation techniques on pinning force densities in Ag/Bi-2223 tapes
Ag/Bi-2223 tapes were fabricated using the Powder-In-Tube method, involyH1~ intermediate deformation techniques of sandwich rolling (SR), pressing (P) and nQl1l1~~ rolling (NR). Magnetic field B depen:lence of Jc was measured. Depending 6rt:~~' relationship between )c and B, the irreversible magnetic field Birr was determineli)lIl..W: pinning force density F was calculated. The experimental res...
متن کاملMagnetic Hysteresis Modelling Based on Magneto-optical Kerr Effect
The paper presents an identification method of the numerical Preisach hysteresis model, based on the digital acquisition and processing of the magnetic microstructure images, which are obtained by time-resolved magneto-optical microscopy. The statistic Preisach function is computed by the superposition of all pixels, allowing to verify the basic assumptions of Preisach hysteresis model from the...
متن کامل