Magnetic Bearing is a non-contact, frictionless bearing system that supports and levitates the rotating shaft through magnetic force.
The principle of magnetic levitation protection bearings is based on the laws of magnetic force and magnetic induction, and its main components include the stator and rotor:
1. Stator: The stator is a part composed of electromagnetic coils, installed on a fixed mechanical structure. Electromagnetic coils generate magnetic fields through electrification, which can be divided into radial and axial magnetic fields.
2. Rotor: A rotor is a part connected to a rotating shaft, usually composed of a permanent magnet or an electromagnet that has undergone electromagnetic excitation.
The working principle of magnetic levitation protection bearings is as follows:
1. Magnetic field generation: By energizing the electromagnetic coil of the stator, a certain magnetic field is formed. The current in the electromagnetic coil can control the magnitude and direction of the magnetic field.
2. Magnetic levitation force: The permanent magnet or electromagnet in the rotor is subjected to the magnetic field generated by the stator, generating magnetic force to support and suspend the rotor. This magnetic force can be generated in both radial and axial directions.
3. Sensor feedback control: Magnetic levitation bearing systems are usually equipped with sensors to detect changes in rotor position and magnetic levitation force. Sensors feed back this information to the control system.
4. Control system: The control system controls the magnitude and direction of magnetic levitation force by adjusting the stator current based on the feedback information from sensors. The control system adjusts the magnetic field and feedback control based on the required bearing stiffness and damping characteristics to maintain the stable suspension state of the rotor.
The advantages of magnetic levitation protection bearings include friction free, wear free, high-speed operation, good dynamic performance, reduced mechanical losses, adjustability, and so on. It has been widely used in high-speed rotating machinery and precision equipment, improving the reliability and performance of the equipment.
