The design uses a 3S2P bonded magnet as an alternative to the 3S2P sintered design to address the above challenges The proposed bonded magnet has an outer diameter of 8.2mm, an inner diameter of 3.0mm, and a height of 10.0mm, with a suggested air gap reduction from 0.8mm in sintered magnets to 0.3mm for the bonded magnet

The magnetic field distribution and back electromotive force (BEMF) of the bonded magnet motor are compared to those of the sintered magnet motor, showing that the bonded magnet motor has a BEMF amplitude of 81% compared to the sintered motor and a significantly smaller cogging torque.

By compensating the winding to ensure consistent back electromotive force (EMF), final test results show that the efficiency of high-speed bonded fans (motor + blades) is very close to that of sintered ones (49% vs. 50%)

Magnequench has successfully addressed critical design challenges like cogging torque and achieved comparable efficiency in high-speed applications with bonded magnet solutions. Choose Magnequench to leverage cutting-edge bonded magnet technology. Reach out to Magnequench experts at: sales@magnequench.com