METHOD OF MAGNET CORE TREATMENT Russian patent published in 2014 - IPC H01F41/02 

FIELD: electricity.

SUBSTANCE: invention is related to electric engineering and purposed for manufacturing of magnet cores for power transformers of secondary supply sources, measurement transformers and current transformers. Method lies in treatment of stranded magnet core of amorphous alloy strip based on cobalt at Curie temperature up to 170°C, which turn-to-turn space is filled by nonorganic glue based on sodium silicate in order to make a rigid structure; the method includes annealing in oxidising environment with further cooling up to room temperature. Magnet core is subject to additional annealing in oxidising environment in the mode of magnet core treatment by heating up to temperature of 100-140°C with the rate of 5-15°C/min in permanent magnet field oriented orthogonally to end plane of strip turns. Isothermal treatment is carried out within 10-20 minutes, then cooling is made up to room temperature in magnet field with the rate of 3-10°C/min. Field intensity is maintained as value of 50-80 kA/m.

EFFECT: reducing magnet losses, obtaining high magnetic inductivity and reducing coercitive voice.