An improved formula for lamination core loss calculations in machines operating with high frequency and high flux density excitation

For electrical machine designers, core loss data are usually provided in the form of tables or curves of total loss versus flux density or frequency. These can be used to extract the loss coefficients of the core loss formulas. In this paper, three currently available formulas are discussed and compared with the loss data supplied by lamination steel manufacturers. It is found that the dynamic hysteresis loop plays an important role in the total loss calculation, especially at high flux densities and high frequencies, and the loss coefficients should change with frequency. A new modified formula is proposed to represent the coefficient changes. The new curve is applied to the measured manufacturer's data, with acceptable accuracy.

[1]  G. Ban,et al.  Frequency and peak induction dependence of eddy current losses in AlSiFe magnetic laminations , 1989, International Magnetics Conference.

[2]  Jianguo Zhu,et al.  Improved formulations for rotational core losses in rotating electrical machines , 1998 .

[3]  Kenji Ohmori,et al.  High frequency iron loss of sendust thin ribbons made by a rapid quenching method , 1987 .

[4]  Silicon Iron,et al.  Frequency Dependence of Iron Losses in 4-Percent Si-Fe Single Crystal with (100) (OOl) Orientation , 1979 .

[5]  D. Jiles.  Frequency dependence of hysteresis curves in 'non-conducting' magnetic materials , 1993 .

[6]  Luc Dupré,et al.  Dynamic Preisach model and energy dissipation in soft magnetic materials , 1998 .

[7]  M. Amar,et al.  A simple method for the estimation of power losses in silicon iron sheets under alternating pulse voltage excitation , 1994 .

[8]  Yo Sakaki,et al.  Relationship among eddy current loss, frequency, maximum flux density and a new parameter concerning the number of domain walls in polycrystalline and amorphous soft magnetic materials , 1981 .

[9]  G. Bertotti,et al.  Dependence of power losses on peak magnetization and magnetization frequency in grain-oriented and non-oriented 3% SiFe , 1987 .

[10]  A. Lopes Ribeiro,et al.  Eddy current and hysteresis losses in ferromagnetic media , 1998 .

[11]  G. Montalenti,et al.  Non linearity anomaly of power losses vs. frequency in various soft magnetic materials , 1975 .

[12]  Massimo Pasquale,et al.  Physical interpretation of induction and frequency dependence of power losses in soft magnetic materials , 1992, 1992. Digests of Intermag. International Magnetics Conference.

[13]  J. D. Lavers,et al.  Prediction of core losses for high flux densities and distorted flux waveforms , 1976 .

[14]  Helmut Pfützner,et al.  Problems of loss separation for crystalline and consolidated amorphous soft magnetic materials , 1991 .

[15]  R. Kaczmarek,et al.  A general formula for prediction of iron losses under nonsinusoidal voltage waveform , 1995 .

[16]  R. Gaylord,et al.  The frequency dependence of the loss per cycle in ferromagnetic sheet material , 1983 .

[17]  M. Imamura,et al.  Frequency dependence of iron losses in 4-percent Si-Fe single crystal with , 1979 .

[18]  S. Washko,et al.  Dependence of losses on flux density in grain oriented 3% silicon steel , 1980 .

[19]  G. Bertotti.  General properties of power losses in soft ferromagnetic materials , 1988 .

[20]  Massimo Pasquale,et al.  Measurement and prediction of dynamic loop shapes and power losses in soft magnetic materials , 1993 .

[21]  G. Bertotti.  Dynamic generalization of the scalar Preisach model of hysteresis , 1992, 1992. Digests of Intermag. International Magnetics Conference.