China Neodymium And Ferrite Magnets Manufacturer & Supplier 
The magnet reinforcement process in internal rotor brushless motors (BLDC motors) is aimed at improving the stability of the magnet and preventing it from falling off or being damaged under high speed, vibration, and other working conditions. The two common reinforcement processes are adding protective steel sleeves and winding fiber membranes. The following is an introduction to these two processes.
With protective steel sleeve
In internal rotor motors, the magnet is usually fixed on the rotor, in order to prevent the magnet from being shocked or dislodged at high speeds and severe vibration, a metal protective sleeve can be added to the outside of the magnet, this is usually a steel sleeve made of stainless steel or other alloy materials.
Various shapes of neodymium rare earth magnets
In this way the steel sleeve provides a strong shell, which can effectively prevent the magnet from being dislodged or ruptured due to external collision or mechanical stress, the disadvantage is that it will increase the weight of the rotor, which may affect the overall efficiency of the motor.
Winding Fiber Film
The fiber film reinforcement process involves wrapping a specific high-strength fiber film (e.g. carbon fiber, fiberglass, etc.) around the outer layer of the magnet, which provides additional reinforcement.
The advantage of using fiber membrane is that the weight is much lower than the steel sleeve, will not significantly increase the weight of the motor, and at the same time, the fiber membrane itself has a strong tensile strength and abrasion resistance, can effectively prevent the magnets due to external forces and rupture or fall off. In addition, the winding layer of the fiber membrane can effectively absorb the vibration generated during the operation of the motor and reduce the impact on the magnet.
Steel sheathing is suitable for applications where the motor is subjected to high mechanical shock or high temperatures are required, providing greater physical protection. Fiber-wound membranes are suitable for applications with high weight and vibration requirements, providing lightweight and efficient protection, but are less resilient to extreme conditions.
Write at the end: Permanent magnet high-speed motors, then the conventional use of carbon fiber and alloy steel sets and composite sets of the two for reinforcement, the specific needs of different motors according to the process to verify.
Brushless motor rotor magnet recommendations;