The Study Of Milling Dynamics And Rotational Speed Control Of A Novel Eccentric Planet Muller

In the thesis, the conditions of the milling ball disengage from the container wall of the Planetary Muller(PM), structure parameters of the PM and effect of the throw of eccentric(e) on the PM have been investigated based on a new PM with eccentric structure. For evaluating the milling efficiency, a dynamic model of the milling ball in the PM was developed and emulated in MATLAB and a frequency control system was designed to carry out the controlling electromotor according to the rule of sinusoidal or cosine.In this thesis, the relation between dynamics and kinematics of milling ball was researched and deduced a new critical expression to indicate the collision relation between the ball and container wall of the PM. A theory model to analyze the effect of e on the milling efficiency also been discussed. The researches show that the e affects the equivalent radius of the disengage point of the PM but an optimum e value, which maximize the milling efficiency, exists in the eccentric PM. The researches also show that milling efficiency is directly proportional to the cube of rotating disc's rotate speed, but the speed should be changed intermittent to maximize the milling efficiency.Based on research above, the dynamic model has been used to guide the design of the control system. In the design, a high functionality transducer and PLC are used to achieve the given dynamic equation, to collect data and control electromotor.The stabilities of the start-up, running, timing and braking of electromotor have been theoretically verified so that the system possesses the function to carry out the controlling electromotor according to the rule of sinusoidal or cosine.