Mechanism of heat loss from ferrite storage cores in still air

The mechanism by which heat is lost from ferrite cores in storage planes is very uncertain. In this paper an attempt is made to investigate this heat-loss process by evaluating the thermal equivalent circuit of a 0.050in core in an unlacquered coincident-current storage plane in still air. The thermal equivalent circuit is found to depend only on the dimensions of the core and the wires. The circuit thermal impedances for a 0.050in core are given. Temperature rises of different sized cores of similar shape and material are compared, and thermal time constants are discussed.