Soft Starting Behavior of a Motorized Spindle System Based on Electromechanical Coupling Dynamic Model

Abstract

It is very important to achieve fast and stable starting for motorized spindles to shorten idle process, improve machining efficiency and reduce an impact on the system. The drawbacks of the existing methods are focused on. The dynamic changes in both starting current and starting torque can not be reflected using the traditional method. Furthermore, the method is easy to produce no convergence with reduced voltage and reduced frequency. The finite element method is not employed in engineering due to low efficiency. The motor itself is only considered in the dynamic analysis method based on motor model and Park transformation. The analysis method of the soft starting performance for a motorized spindle system is proposed based on electromechanical coupling dynamic model. The soft starting transient process of the system is studied by the proposed method. The effects of electromechanical parameters on starting current, starting torque, pulsation torque and so on are analyzed. The experiment is also performed on a prototype. The physical mechanism of electromechanical coupling is revealed. The method is presented to suppress vibration, improve stability and accelerate starting. The validity of the proposed analysis method is confirmed by simulation and experiment.