Power Matching Based

To overcome the imbalance between spindle heat generation and dissipation caused 11 by existed spindle cooling strategies, this paper develops a power matching based cooling 12 strategy for motorized spindle unit. Firstly, heat generation, conduction and dissipation are 13 considered for the modeling of spindle structural heat exchange. This modeling methodology 14 conveys that an operating motorized spindle unit will have satisfactory thermal behaviors only 15 if the supply dissipation powers from recirculation coolants are dynamically and respectively 16 equal to their corresponding heat generation powers (mainly from spindle bearings and motor). 17 Based on this principle, the power matching between spindle heat generations and dissipations 18 is realized by the real-time power estimations of spindle heat sources and the modified constant 19 supply cooling powers strategy. It can be ultimately verified by experiments that the power 20 matching based dissipation strategy is more advantageous than existed spindle cooling 21 strategies in dissipation of spindle heat generations and decrease of thermal errors. 22