Abstract - The paper describes a lumped parameter
equivalent circuit for the HF analysis of mush wound coils of AC
windings. The equivalent circuit takes account of turn-to-turn and
turn-to-iron stray capacitances. Dissipative phenomena due to eddy
currents in the coil wires and the laminated iron core are also
considered. The parameter identification is based on sinusoidal
impedance measurements on a test coil. The model of a multi-coil
AC stator winding can be easily derived from the proposed equivalent
circuit. This model allows one to predict both common- and
differential-mode conducted EMI in switching converters supplying AC
motors. The simulation results obtained by PSpice are in good
agreement with the experimental data.