Tim Li, Frank Zhu, Haolong Zhang 14/07/2014
Parameters:
Mass of the stage:
Mass of the extrusion head:
Mass of the ball screw:
Mass of the coupler:
Screw pitch:
Diameter of the ball screw:
Inner diameter of the coupler:
Outer diameter of the coupler:
Required speed of the stage:
Formula:
1.
T: Torque P: Power N: Rotate speed
2.
T: Torque J: Inertia : Angular acceleration
3.
J: Inertia M: Mass : Screw pitch
Calculation:
1.Necessary torque for friction
●Friction between the stage and the ball screw
Estimated friction coefficient:
, is the mechanical efficiency which is assumed as 0.9.
●Necessary torque
2.Necessary torque for starting
●Load inertia
●Ball screw rotate inertia
●Coupler rotate inertia
●Motor rotate inertia
●Rotate speed of the motor
●Angular acceleration
●Necessary torque for starting
3.Necessary torque
Assumed that the safety coefficient is 3, therefore, the total torque is
4.Necessary power