Basic principle of bearing in Maglev blower

In principle, there are two types of magnetic bearings, one is active magnetic bearing (AMB) and the other is passive magnetic bearing (PMB).

Because the former has better performance, it has been more and more widely used in industry. The magnetic levitation bearing system is mainly composed of suspension body, sensor, controller and actuator. The actuator includes an electromagnet and a power amplifier. It is a simple magnetic suspension bearing system. The current on the electromagnet winding is I. The attraction force generated by the suspended object is balanced with the gravity (mg) of the suspended object itself, and the suspended object is in the suspended equilibrium position. This position is also referred to as the reference position.

Assuming that the suspended object is disturbed by the downward disturbance at the reference position, it will move downward from the reference position, and the sensor will detect the displacement of the suspended object from the reference position. The controller converts the displacement signal into a control signal power amplifier to increase the current flowing through the electromagnet winding, so as to increase the attraction force of the electromagnet and return the suspended object to the original equilibrium position. The controller and the power amplifier will reduce the current flowing through the electromagnetic coil when the suspended substance is disturbed upward and moves upward. Therefore, the attraction force of the electromagnet decreases. The stiffness, damping and stability of the suspension system are determined by the control law, and the suspension system can return to the original equilibrium position. The stiffness and damping can vary greatly within the physical limits, and can also be adjusted according to the technical requirements, or even changed during operation.

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