The Concept of Heat and the Hysteresis Loop: The Evolution of the Losses Models

The origin of iron losses in ferromagnetic materials is commented on, starting with the definition of heat. The different possible dissipative mechanisms inside a hysteresis curve, which originate heat, as well its relationship to the magnetic Barkhausen noise, are discussed in detail. The loss separation model is better explained by using the concept of heat, especially to understand losses when eddy currents are small (at very low frequencies).