The characteristics of ferrite cores with low Curie temperature and their application

The utility of ferrite cores which have the Curie temperature in the vicinity of the room temperature and suddenly change the permeability vs. temperature characteristic near the Curie temperature is described in this paper. Using the characteristics of these ferrite cores, the author made an overcurrent relay and a long delay circuit, and investigated their application to a temperature control device and to the thermomagnetic generator. These devices are smaller than usual, and operate with good accuracy. The author finds that ferrite cores with low Curie temperature are materials important to the development of a new field in electrical engineering.