Model for Angular Dependency of the Intrinsic Coercivity Force of Ferrite Permanent Magnets

In internal permanent magnet synchronous machines, the use of ferrite permanent magnets is being studied as an alternative to rare-earth elements-based permanent magnets, such as NdFeB. However, demagnetization measurements of ferrite magnets are rarely published and such information is crucial for an efficient electrical machine design with ferrite magnets. In this paper, we present measurements of partial demagnetization on ferrite permanent magnets subject to inclined external magnetic fields. From the measurements done, a mathematical model is developed that defines a relationship between the intrinsic coercivity and the inclination of the external demagnetizing field.