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Kinematic analysis of auto-eliminating protective clearance device for active magnetic bearing systems
Received date: 2014-07-22
Revised date: 2014-10-14
Online published: 2014-10-29
Supported by
National Natural Science Foundation of China (51205186)
An auto-eliminating clearance auxiliary bearing device which can automatically eliminate the protective clearance in active magnetic bearing system after rotor dropping is presented. Firstly, its mechanical structure and working principles are introduced. Secondly, the device's degree of freedom is kinematically analyzed. Moreover, for two different structures of devices, the influences of the devices' radial dimension, the distance between the swing center of support and the center of the pin hole in link rod, the size of the clearance between the pin and pin hole in link rod on the maximum swing angle of the supports in these two devices are compared. Finally, the maximum swing angles of those supports in each situation are experimentally verified. The results show that compared with the device with the structure that the swing centers of supports are located at the outer side of the link rod, supports in the device in which the swing centers are placed in the inner side of the link rod could swing to a greater angle. According to these results, the design criterion of the main structure parameters of auto-eliminating clearance auxiliary bearing is given. The results provide a theoretical basis for the design and use of this auxiliary bearing in active magnetic bearing systems.
YU Chengtao , XU Longxiang , JIN Chaowu . Kinematic analysis of auto-eliminating protective clearance device for active magnetic bearing systems[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(7) : 2485 -2496 . DOI: 10.7527/S1000-6893.2014.0289
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