Abstract
This paper presents a simulation model for the dropdown of a high-speed electric motor utilizing the active magnetic bearings (AMB). In the circumstance that there is not a sufficient electromagnetic field or the system experiences excessive load, the rotor drops instantly on the backup bearings. The dropdown is accompanied by a considerable friction between the surfaces of the rotor and backup bearings. This study evaluates the heat generation and thermal behavior of backup bearing that are essential for the design of AMB systems. The model enables to calculate the power loss resulted from the friction between the rotor and backup bearing. The simulation includes the FE-model of the rotor and the backup bearing model. The one-dimensional thermal network has been applied to the thermal model of the bearing. The study concentrates on evaluating the friction heat generated and thermal growth of the deep groove ball bearing type in the non-drive end of the motor.
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