Improved Jiles–Atherton Magnetic Core Model and Its SPICE Implementation

This research presents an improved version of the Jiles–Atherton (J.-A.) ferromagnetic core model. The presented model eliminates the distortion of minor hysteresis loops and achieves better matching with measured data for minor loops—a well-known weak point of the unmodified J.-A. model. The proposed J.-A. model extension is backward compatible with the basic model version and requires two or four additional parameters. In addition to providing model equations, this paper considers the practical implementation of the improved J.-A. model using SPICE circuit simulation tools. The developed modular SPICE macromodel set is compatible with both open-source and proprietary circuit simulation software, and it allows for the construction of transformer schematics of any complexity. The proposed model shows a good match with measurement results for hysteresis loops and transient waveforms in transformer circuits.