Bonded magnets for brushless fractional machines: Process parameters effects evaluation

The adoption of bonded magnets in substitution of ferrites in small PM motors is an interesting challenge and represents a good opportunity for motor designers. The proposed analysis regards the production of bonded magnets based on rare earth powder mixed with different resins; the effect of the process parameters, in particular the pressure on the mold, is evaluated by means of measurements on the magnets, FEM simulations and experimental tests on prototypes. The opportunity to vary also the resin percentage is briefly proposed as a glance on future developments of the work.