1.When a fault occurs in the magnetic levitation system， the emergency touch down bearings can support the rotor, preventing it contact with the electromagnetic mechanism and damaging the internal components. The speed of the emergency touch down bearings can reach 50,000 to 60,000 revolutions during operation, and the destructive power under high speed is extremely large. If it loses control, it will cause damage to the internal components.

2. When the magnetic levitation bearing system is not in operation, the emergency touch down bearings can provide the necessary support for the magnetic levitation rotor. Ensure that the rotor remains stable even when not in operation to prevent accidental movement or damage due to the loss of magnetic support.

3. The protective bearings can also continue to support the rotor after the system is shut down, maintaining the rotor's operation for a short period of time and further enhancing the system's reliability.