Temperature induced shift of the demagnetization curve of anisotropic ferrite magnets

Higher specifications and more narrow tolerances for electrical motor appli ances give sense to a renewed interest in the temperature dependence of the demagnetization curve of anisotropic ferrite magnets. Based on physical ba ckgrounds, a first approximation modelling is given for the temperature dep endence of a working point, using the room temperature curve and some mater ial and system characteristics. A procedure is derived to give the induced shift of the whole curve at any temperature (-100 to 300 degrees C). An imp ortant characteristic for the application is the field Hki where irreversib le flux losses start. Hence, the critical temperature decrease, at which Hk i is reached in the system, is derived.