METHOD FOR ANNEALING A CORE BLANK USED IN ELECTRIC MACHINERY AND DEVICES
摘要
<p>The present invention relates to a method for annealing a core blank of a transformer or the like so as to relieve the stress generated in the electrical steel sheet sections due to blanking. The present invention is an improvement over the conventional resistance or gas-heating method in the light of heating efficiency and time and is characterized by induction-heating a core blank at a power input range of from 0.5 to 3 kW/kg of the core blank. This range attains a small variation in the shape of a core blank due to induction-heating.</p>
