**Kalina Detka and Krzysztof Górecki \***

Department of Marine Electronics, Gdynia Maritime University, Morska 83, 81-225 Gdynia, Poland; k.detka@we.umg.edu.pl

**\*** Correspondence: k.gorecki@we.umg.edu.pl

Received: 12 June 2020; Accepted: 24 July 2020; Published: 27 July 2020

**Abstract:** In this paper, a new thermal model of the inductor is proposed. This model takes into account self-heating in the core and in the winding, and mutual thermal couplings between the mentioned components of the inductor. The form of the elaborated thermal model is presented. In this model, the influence of power dissipated in the core and in the winding of the inductor on the efficiency of heat removal is taken into account. Correctness of the model is verified experimentally for inductors containing ferrite cores of different shapes and dimensions. The good agreemen<sup>t</sup> between the results of calculations and measurements is obtained. On the basis of the obtained findings, the influence of volume and the shape of the core on thermal resistances and thermal capacitances occurring in this model is discussed.

**Keywords:** inductors; ferromagnetic cores; thermal model; transient thermal impedance; thermal resistance; self-heating
