I have a system with a motor connected to the trapezoidal lead screw. The lead screw is connected to the tube which is connected to the piston. The piston has to pump 1000cc oil against a pressure of 20 bar into the bladder.
Well , first I found out the force on the piston at 200m which is 10054 N. I calculated the torque considering 20 bar+1000 Pa of extra pressure to push the oil into the bladder at 20 bar. The resulting torque was calculated as 12.6 Nm (this seems a lot to me and hence asked the question on this forum). Once I know the RPM of the motor, I can calculate the piston velocity (using stroke length ,lead and RPM)
Is this approach correct? Am I doing something wrong? If not, then which motor should I use?
- Piston diameter: 80 mm
- Pitch of the screw: 3mm
- Lead angle: ø = 9.38˚
- Helix angle: α = 6.8˚
- Time to pump the oil into the bladder at 20 bar: 12s ± 3s (This can increase but I am trying to keep it as low as possible)
- The orifice diameter is 17.77mm