Method of field annealing an amorphous metal core by means of induction heating

摘要

A magnetic core is disclosed herein along with associated electrical coils which together with the core form part of an overall electrical inductive apparatus such as a transformer. The core itself is one which is initially formed from a continuous strip of amorphous metal wound about itself to form a closed loop of adjacent laminations. Thereafter but before the core is annealed causing it to lose its ductility and flexibility, one section thereof is provided with a joint which is flexed open to receive the electrical coils. Once the coils have been suitably assembled around the core, the latter is annealed by means of induction heating. More specifically, one of the coils is energized at a relatively high frequency for inducing a current through the core sufficient to heat the latter to satisfactory annealing temperatures for a prescribed period of time.