Brushless DC is driven by electromagnetism, the conductor does not touch, it is driven by the winding under the magnetic field, there is no friction without contact, the service life is long, and the noise is small, the speed of the motor rotor is affected by the speed of the rotating magnetic field of the motor stator and the rotor pole Number (P) effect: n=60* f / P. When the number of poles of the rotor magnet is fixed, changing the frequency of the stator's rotating magnetic field can change the speed of the rotor.
DC brushless radiators have relatively high requirements for heat dissipation efficiency, quietness, and long life. Therefore, the requirements for rare earth permanent magnets are:
1. The permanent magnet is a NdFeB magnet, and its magnetic force is higher than that of a ferrite magnet
2. The concentricity and roundness of the permanent magnet are strict, and the dynamic balance after assembly meets the requirements
3. Some rotor magnets require glue reduction to ensure balance.
Typical properties of radiator magnets
Residual lnduction：0.35-0.45T
Coercive Force ：224-256kA/m
Intrinsic Coercive Force：480-640kA/m
Max.Energy Product：20-28kJ/m3
Permeabilily：1.2μH/m
Temperature Coefficient of B(%/℃) -0.11
Curie Temperature：320℃
Max.Operating Temperature：160℃
Density：5.0-5.5g/cm3
Coating:Epoxy coating(black or gray)
Magnetizing：by Specify number of poles from customer
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