Speaker Magnets (Neodymium magnets)

Speaker Magnets (Neodymium magnets), Laminated Arc and Block Permanent Magnets, Rare Earth NdF and SmCo lamination magnets, Segmentation Technology Layered Magnets, Laminated Magnetic Assemblies

Speaker Magnets (Neodymium magnets) can reduce eddy current Loss in high efficiency motors.

High efficiency demands the best material, and the laminated rare earth magnets are proven to reduce eddy current losses in high efficiency motors. Fewer eddy current losses means lower heat and greater efficiency.

Laminated magnet is to cut the whole magnet into many small magnets, and then use specific glue to bond together. These samll magnets are insulated form each other and can down lectromagnetic eddy current.

When the permanent magnet motor is running, the motor will generate harmonic and the magnet will generate skin effect, these all will bring a lot of eddy current loss. And then, the temperature of permanent magnet rises, which results in irreversible demagnetization and affects the safety and stability of motor operation. So the design of laminated magnet can just cut down this risk.

Technical requirement:

1. The thickness of insulating layer is whith 0.04mm.
2. In mormal temperature, the bond strength of insulating layer can reach more than 50Mpa.
3. The maximum working temperature can reach 200 degress.
4. The whole geometric tolerance is within 0.05m.
5. These small magnets are insulated from each other.

Applicatoion scope:
Now aerospace, automotive, motorsport, and industrial markets are turning to laminated rare earch magnets, and are working to balance the tradeoff between power and heat.


purpose:
To reducee magnetic eddy current loss
Caltulation of eddy current losses with and without lamination are shown below: