Ferrite Ring Magnets with Multi-poles through Thickness for Motor Application

China Rare Earth Magnet Limited manufactures ferrite motor magnets. Some customers required ring ferrite permanent magnets  with multi-poles used in fan BLDC motor. They usually give us OD, ID, thickness, poles and magnetization direction, grade or magnetic properties like Br, Hcb, Hcj, BH, etc.
 

Ferrite Motor Magnets Inquiry - For example:
---Look for Ferrite Ring Magnets  Ferrite Ring Magnets:
We are working on new motor which need ferrite magnetic ring.
Type – Permanent Magnet
Size: *OD-*ID-*T
10 poles  
Application – Fan BLDC motor
Br>4100Gs, Hc>2800Oe, Bhmax>4.0MGOe
Based on the above parameters mentioned, please suggest the grade.
---Ferrite Magnets Manufacturer China Rare Earth Magnet Limited:
Please kindly check the quote below.
Ring shape, none coating, 10 poles through thickness
Ferrite Permanent Magnet   Material/Unit price USD*/pc
We do not have the magnets in stock, so samples will have to be customized, but molding is necessary for this kind of magnets. 

Related Knowledge:

What is brushless DC motor?
Brushless DC motor is mainly composed by permanent magnet rotor, multi-poles coil stator and rotor position sensor. The characteristic of brushless dc motor is brushless, adopting semiconductor switch devices (like hall element) to realize electronic commutation. It uses electronic switch device instead of traditional contact commutator and brush. Brushless DC motor has advantage of high reliability, no commutation spark, and low mechanical noise. The position sensor converts the current of stator winding along a certain sequence according to the variation of rotor position, (i.e. to detect the position of the rotor magnetic pole relative to the stator winding, and generate the position sensor signal in determinate location, to control the power switch circuit after processing signal conversion circuit, and to switch winding current according to a certain logic relation).

What is a brushless dc fan?
There is no carbon brush contact between rotor and stator in brushless DC fan. The rotation is achieved by the interaction of the magnetic force in the magnetic field. According to the different voltage, brushless fan is divided into ac voltage brushless fan and dc voltage brushless fan two main types. It works mainly by pushing fluid motion caused by blade rotation pressure, to transfer energy to the surrounding fluid in dynamic way, and to force air flow and remove the heat generated by the system to the outside environment.