Title :
High frequency behaviour of laminated magnetic structures
Author :
Morganti, F. ; Cresson, P.Y. ; Roger, D. ; Brudny, J.-F.
Author_Institution :
LSEE, Univ. d´´Artois, Bethune, France
Abstract :
Electrical stress on winding insulation of AC machines fed by modern PWM inverters becomes more and more important as switching speed of power electronic devices increases because local resonances, due to parasitic capacitors, may occur. This paper studies the laminated iron structure behaviour in order to detect these local resonances by measuring magnetic field around the machine. First of all, a simple analytical model is proposed and verified with an elementary strip-wound cut core, then field measurements near a laminated magnetic structure show the weakening of its shielding effect when frequency increases
Keywords :
AC motors; AC machines; PWM inverters; eddy currents; electrical stress; elementary strip-wound cut core; field measurements; high frequency behaviour; laminated iron structure behaviour; laminated magnetic structures; local resonances; parasitic capacitors; power electronic devices; shielding effect weakening; skin effect; switching speed; winding insulation;
Conference_Titel :
Power Electronics and Variable Speed Drives, 1998. Seventh International Conference on (Conf. Publ. No. 456)
Conference_Location :
London
Print_ISBN :
0-85296-704-7
DOI :
10.1049/cp:19980530
