An Integrated Design Method for the High-Speed Motorized Spindle with Water-Lubricated Spiral Groove Bearings

This paper proposes an integrated design method for the high-speed motorized spindle supported by water-lubricated spiral-grooved thrust bearings (SGTBs) and herringbone-grooved journal bearings (HGJBs). In this method, the coupling relations among the design variable groups are identified as strong-coupling ones and weak-couple ones in advance. Then, the optimization design problem of whole system is broken up into three sub-problems and solved step by step. Dimension of variable space of the integrated design problem is consequently decreased greatly. The mathematical model for motorizes spindle system is established by combining the hydro-lubrication model of bearings with rotor model based on transfer matrix method. The dynamic design has been conducted for the motorized spindle with water-lubricated SGTBs and HGJBs using the proposed design method. The design results show that the efficiency of the optimized motorized spindle is increased by 12% comparing to the original structure.