Due to the max working temperature of NdFeB is 220 (N35AH), more higher the temperature, the
magnetic properties of Nd-Fe-B will decrease, and the conversion rate and power of the motor will be
reduced. This is called heat loss! The heat loss mainly comes from the electromagnetic eddy current
in the motor work. These eddy current losses may cause a high temperature rise, resulting in local
demagnetization of permanent magnets, especially in some high speed or high frequency permanent
magnet synchronous motors. Therefore, we need to reduce the heat loss by means of laminated
magnets method (the insulation between small magnet piece and small magnet piece).
Calculation of eddy current losses with and without lamination are shown below:
Laminated magnet assembly has small vortex , while remain the same performance with overall magnet assembly or even superior. Most of the rotor magnet in motor and electric car can use such a design, so to increase the application of insulated stitching magnet components.
1. The thinnest available insulating layers, <20 um;
2. Performance at temperatures up to 220˚C
3. Magnet layers from 0.5 mm and up custom shapes and sizes in neodymium magnets