# Eddy current losses in ferromagnetic laminations

## Abstract

It is demonstrated through the comparison of analytical, numerical, and experimental results that the existence of excess eddy current losses can be explained by the peculiar nature of the nonlinear diffusion of electromagnetic fields in magnetically nonlinear laminations. The essence of this peculiar nature is that nonlinear diffusion occurs as inward progress of almost rectangular profiles of magnetic flux density of variable height. Approximating actual profiles of magnetic flux density by rectangular ones, the problem of nonlinear diffusion can be treated analytically by using a simple model. The accuracy and the limit of applicability of the rectangular profile model are discussed by comparing its predictions with finite elements numerical solutions of nonlinear diffusion equation as well as with experimental results. (c) 2000 American Institute of Physics.

- Authors:

- Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742 (United States)
- Department of Electrical Engineering, University of Naples ''Federico II'', I-80152 Napoli, (Italy)
- IEN Galileo Ferraris, Corso M. d'Azeglio 41, I-10125 Torino, (Italy)

- Publication Date:

- OSTI Identifier:
- 20216287

- Resource Type:
- Journal Article

- Journal Name:
- Journal of Applied Physics

- Additional Journal Information:
- Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 36 MATERIALS SCIENCE; FERROMAGNETIC MATERIALS; EDDY CURRENTS; MAGNETIC FLUX; SILICON ALLOYS; IRON ALLOYS; GRAIN SIZE; HYSTERESIS; MAGNETIZATION; EXPERIMENTAL DATA; THEORETICAL DATA

### Citation Formats

```
Serpico, C., Visone, C., Mayergoyz, I. D., Basso, V., and Miano, G.
```*Eddy current losses in ferromagnetic laminations*. United States: N. p., 2000.
Web. doi:10.1063/1.372887.

```
Serpico, C., Visone, C., Mayergoyz, I. D., Basso, V., & Miano, G.
```*Eddy current losses in ferromagnetic laminations*. United States. doi:10.1063/1.372887.

```
Serpico, C., Visone, C., Mayergoyz, I. D., Basso, V., and Miano, G. Mon .
"Eddy current losses in ferromagnetic laminations". United States. doi:10.1063/1.372887.
```

```
@article{osti_20216287,
```

title = {Eddy current losses in ferromagnetic laminations},

author = {Serpico, C. and Visone, C. and Mayergoyz, I. D. and Basso, V. and Miano, G.},

abstractNote = {It is demonstrated through the comparison of analytical, numerical, and experimental results that the existence of excess eddy current losses can be explained by the peculiar nature of the nonlinear diffusion of electromagnetic fields in magnetically nonlinear laminations. The essence of this peculiar nature is that nonlinear diffusion occurs as inward progress of almost rectangular profiles of magnetic flux density of variable height. Approximating actual profiles of magnetic flux density by rectangular ones, the problem of nonlinear diffusion can be treated analytically by using a simple model. The accuracy and the limit of applicability of the rectangular profile model are discussed by comparing its predictions with finite elements numerical solutions of nonlinear diffusion equation as well as with experimental results. (c) 2000 American Institute of Physics.},

doi = {10.1063/1.372887},

journal = {Journal of Applied Physics},

issn = {0021-8979},

number = 9,

volume = 87,

place = {United States},

year = {2000},

month = {5}

}