We're looking at magnetizing a small bonded ferrite magnet using sintered neodymium magnets. It looks doable, but I'm confused about the energy aspects of this system.
Looking at the max energy products, bonded ferrites are roughly 1.5MGOe, while N52 magnets are 52MGOe. Multiplying through their respective volumes I get energies of 7mJ for the ferrite part and 13J for the neo magnets, a ratio of about 20kJ/J.
Of course this is a simplification as neither will be operating at their maximum energy potentials, but what else is missing here? Does this imply that this system will demagnetize the neo magnets over (very roughly) 20k parts?
The magnetizing system I've drawn up in FEA utilizes a steel yoke and has a relatively small air gap, and it appears that the neo magnets are operating at a good permeance coefficient and are not at risk of demagnetizing... is this not the case?
Looking at the max energy products, bonded ferrites are roughly 1.5MGOe, while N52 magnets are 52MGOe. Multiplying through their respective volumes I get energies of 7mJ for the ferrite part and 13J for the neo magnets, a ratio of about 20kJ/J.
Of course this is a simplification as neither will be operating at their maximum energy potentials, but what else is missing here? Does this imply that this system will demagnetize the neo magnets over (very roughly) 20k parts?
The magnetizing system I've drawn up in FEA utilizes a steel yoke and has a relatively small air gap, and it appears that the neo magnets are operating at a good permeance coefficient and are not at risk of demagnetizing... is this not the case?