METHOD OF FORMING HYBRID MAGNETIC ELEMENT FOR ELECTRIC MACHINE ROTOR, WHICH IS RESISTANT TO IRREVERSIBLE DEMAGNETIZATION UNDER CONDITIONS OF OVERHEATING Russian patent published in 2024 - IPC H02K1/27 H01F7/02 H01F1/00 H02K21/02 

FIELD: electrical engineering.

SUBSTANCE: reduced demagnetization during heating provides reduction of total (summarized) temperature coefficients by coercive force Hcj and residual induction Br of hybrid magnet during operation. Method of forming hybrid magnetic element for PMBED includes making combined poles from magnetic materials resistant to irreversible demagnetization. Zones of possible overheating of the rotor magnetic element, which cause irreversible demagnetization at operating temperatures of the electric machine rotor, are first detected. Rotor magnetic element is made in the form of a package of glued together parts from ferromagnetic materials, number and sequence of location of which in direction perpendicular to polar axis of magnetic element, chemical composition of material of parts, coercive force index and glue parameters are selected based on the condition of electric machine rotor functioning in areas of possible overheating. In the identified zones of possible overheating, there are parts made from materials having a demagnetization temperature, exceeding temperature of rotor magnetic element overheating under conditions of electric machine operation.

EFFECT: improving operating efficiency of synchronous permanent magnets based electric drives (PMBED) by minimizing the effect of temperature heating on magnetic characteristics of permanent magnets (PM).

7 cl, 8 dwg, 1 tbl