Magnetic Bearing Rotor System: Dynamic Breakthrough on Moving Platform

The researchers pointed out that the magnetic bearing has the advantages of no physical contact with the rotor and controllable bearing characteristics, which is conducive to the high-speed operation, vibration reduction and noise reduction of rotating machinery such as motors. To realize the application of the magnetic bearing on the moving platform, after a lot of mathematical modeling and environmental analysis, the researchers finally established the mathematical model of the magnetic bearing rotor system on the moving platform.

Active magnetic bearing (AMB) is one of the active control components of rotor vibration, which has been applied in industry. Compared with the mechanical bearing, the magnetic bearing has no physical contact with the rotor, which is not only very suitable for high-speed rotating occasions but also can adjust the support characteristics of the magnetic bearing through the control system in real-time, to realize the active control of vibration, which has a broad industrial application prospect.

With the high-performance requirements of high-speed operation, vibration reduction, and noise reduction of rotating machinery in the fields of ship integrated power, automobile power drive. So, the application of magnetic bearing in the motion platform has attracted people’s attention. However, most of the current research and application of magnetic bearings are based on the premise that the magnetic bearing system is installed on the static foundation platform, ignoring the influence of the foundation movement on the dynamic characteristics of the magnetic bearing, limiting the application scope of the magnetic bearing.

In this modeling, there are many scholars to study this aspect. Still, most of them are limited to specific objects and motion characteristics, which is challenging to apply to the magnetic bearing system on a large-scale motion platform. Therefore, in later research, they must pay attention to learning to avoid these problems.

Finally, they concluded:

1) For the magnetic bearing rotor system on a large-scale moving platform, the nonlinear dynamic characteristics of the rotor caused by significant angle rotation and the influence on the gravity load distribution of the magnetic bearing must be considered.

2) The essence of magnetic bearing is to realize the stable suspension of the rotor relative to the stator by using electromagnetic force. The carrier movement will bring the change of stator position, cause the change of air gap between stator and rotor, affect the magnitude of electromagnetic energy, and disturb the suspension state of the rotor. However, the dynamic response speed of the magnetic bearing is limited, so the motion of the carrier will increase the displacement of the rotor shaft vibration and reduce the stability of the magnetic bearing system.

3) Tilt belongs to the static environment, which will change the gravity load distribution of the magnetic bearing and affect the dynamic characteristics of the rotor. Swing belongs to the dynamic environment, which not only makes the gravity balance load of the magnetic bearing change periodically with time but also brings the interference torque of progressive change to the magnetic bearing through the implicated movement of the stator, resulting in the fundamental frequency or frequency doubling component directly related to the swing of the hull in the system response. The magnetic bearing must have sufficient response speed, and continuously adjust the electromagnetic force in real-time Overcome the interference caused by gravity and stator motion.

Once these problems can not be solved, the magnetic bearing rotor system can not be put into use. For this reason, they must make further preparations. For example, the detection method of bearing operation failure needs to be taken into account.