DESIGN AND ROTOR DYNAMIC MODELING OF HIGH SPEED MILLING SPINDLE SUPPORTED WITH AMB

摘要

This paper discusses design and detail modeling procedure of an accurate rotor dynamic model of high speed milling spindle supported with AMB. A fine tuning of rotor dynamic model for the AMB rotor is needed since the AMB rotor has many interference fitted parts such as laminated rotors and high speed AC motor. In addition, the draw bar equipped with springs and gripper assembled in the inner diameter of spindle with high pre load Furthermore, the tool and tool holder can be changed considerably according to specific applications. Therefore, it is very difficult to acquire the accurate numerical mode. To get accurate mathematical model with FEM, three types of model are introduced The first model is the spindle without draw bar, the second the spindle with draw bar and the last model the spindle with tool holder. The obtained accurate rotor dynamic model can be used as a good nominal model for the high performance controller and it can contribute to the precise estimation of the parameter variation due to tool and tool holder change without experiments.