CONTROL METHOD OF ANNEALING TEMPERATURE OF IRON CORE FOR ELECTRIC APPARATUS

摘要

PURPOSE:To control the output of an inverter by inverter control means using the results of a sought true mean annealing temperature and the heating conditions of an iron core by removing the periodic variation due to the thickness of the iron core from the temperature data measured by optical temperature measuring means and by averaging. CONSTITUTION:The data of the temperature measured by temperature measuring means 3 of an iron core 2 which is moving in a heating coil are stored in the memory 13 of a microcomputer 10 in every arbitrary sampling time Ts and an artificial mean annealing temperature Xd is sought and stored after the data of the temperature of the thickness L of 1-2 iron cores 2 are obtained. After the second measurement, a temperature XL wherein a previously set normally generated dispersion temperature DELTAX is reduced from the Xd is calculated to remove the temperature data except the normally generated dispersion temperature. Temperature data B for the temperature which is lower than the temperature XL from sampled temperature data are made void. A mean annealing temperature X near a true value is sought by averaging again when the stored number of the above-mentioned artificial mean annealing temperatures became (n).