What are the specific features of the Nanotec linear actuators?
Support » FAQ » Linear actuators
The achievable resolution, precision feed control speeds and forces are calculated on the basis of the pitch of screw (p in mm), propelling torque
flow characteristics (Md in Ncm) and efficiency as follows:
- Resolution in mm/step =/(360°/step angle) e.g. 1 mm/(360°/0.9°) = 0.0025 mm/step
- Feed rate = f • resolution e.g. 2000 1/s • 0.0025 mm = 5 mm/sec
- Thrust in N = MdMot • 2π • efficiency/p e.g. L5609X approx. 15 Ncm at 2 kHz = 15 • 6.28 • 0.1/0.1 cm = 94 N (peak torque)
- Efficiency = acc. to DIN 267 - Sheet 1; the efficiency is: fine-pitch screw thread approx. 0.1; trapezoidal spindle approx. 0.4; ball screw spindle approx. 0.9. In addition, the static and rolling friction (0.9 to 0.7), the surface structure (roughness/hardness of the spindle and nut), material pairing (steel/steel), (steel/copper bronze), (steel/POM plastic), pollution severity and concentric spindle guide must be taken into account in the calculation of the service life estimate. It is imperative to determine the operational stability and possible service life in a real trial. (An empirical efficiency for the overall system of approx. 0.3 results for the trapezoidal spindle and approx. 0.7 for the ball screw)
