Abstract
This paper presents a theoretical investigation on operation mode and load sharing strategy of hybrid foil-magnetic bearings (HFMBs). According to the inherent characteristics of gas foil bearings (GFBs) and active magnetic bearings (AMBs), six possible work scopes are discussed to understand the operation mode of HFMBs. A numerical model coupling the calculations of the film pressure in GFBs and the magnetic forces in AMBs is conducted to predict the operation performance of HFMBs. The accuracy of the model is proved by comparing the predicted and tested friction torques. Analysis on the static and dynamic performance of HFMBs within three representative cases is conducted by varying the load sharing ratio. The dynamic supporting stiffness and operation position of HFMBs can be obviously enhanced by adjusting the operating mode and load sharing strategy. Results show that the direct stiffness and dynamic damping of HFMBs adopting hybrid mode are significantly higher than those adopting AMB or GFB independent mode.
Highlights
Advanced energy and power equipment with high operating speeds, high energy density, and high working efficiency require oil-free bearings to have more comprehensive performance and adaptability to severe environment
5 Conclusion In order to guide the conceptual design of hybrid foil-magnetic bearings (HFMBs), this paper presented a theoretical investigation on operation mode and load sharing strategy with the consideration of bearing stability
Three representative work points were selected to analyze the effect of operation modes and load sharing strategies on HFMBs performance
Summary
Advanced energy and power equipment with high operating speeds, high energy density, and high working efficiency require oil-free bearings to have more comprehensive performance and adaptability to severe environment. Based on the characteristics of GFBs and AMBs, the possible work scope of HFMBs with respect to load capacity and rotational speed is discussed. Scope 1: As the rotational speed is low, the gas pressure generated between the top foil and the rotor is not enough to support the bearing load. The static and dynamic performance of the HFMBs can be affected by adjusting the load sharing ratio, even applying magnetic force to increase the rotor mass when adopting hybrid operation mode. In the static calculation process of GFBs, the specific bearing load and speed correspond to a certain eccentricity and attitude angle of the rotor under the action of gas film force.
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