Norgren Featured Datasheets
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08/22 Our policy is one of continued research and development. We therefore reserve the right to amend, without notice, the specifications given in this document. (2019-9261a) © 2020 IMI International S.R.O. en 1.6.500.07 3. Selection of the actuator, motor and gear box 3.1 Selection of the actuator The selection of the actuator is carried out based on the sizing of the internal bearing system. A sufficiently sized bearing system indicates a sufficiently sized actuator. Additionally, the maximum thrust force necessary during the load cycle must be compared to the maximum force applicable to the actuator 3.2 Selection of a motor and gear box For each actuator, two motor sizes are available with different gear box ratios. The selection of the motor and gear box is based on the driving torque T rotational speed n of the actuator shaft which have to be calculated for each step of the load cycle. Size 48 60 80 100 d pulley: 38.20 mm 49.34 mm 66.21 mm 84.03 mm Using a gear box reduces the necessary motor torque while increas- ing the rotational speed of the motor. All values calculated must be below the intermittent torque the motor can deliver (diagr. pages 16 ... 18). T act Torque at the actuator shaft Nm T mot Output torque of the motor Nm n act Rotational speed of the actuator shaft min-1 n mot Rotational speed of the motor shaft min-1 v max,step Maximum velocity of each step m/s To avoid overheating of the motor, the mean torque T mot . rms of the load cycle must be lower than the continuous torque (diagr. pages 16 ... 18). 4. Additional moutings To avoid bending of the actuator, the installation of additional mountings may be necessary. For each actuator size, the maximum unsupported length can be estimated with the forces in y- and z-di- rection using the diagrams on page 9. 5. Safety stroke Disregarding the initial set up, the actuator must not touch its me- chanical end stops. A safety stroke should be considered, respecting the application boundaries and environments. We generally recommend a safety stroke of 20 mm per side for electric rodless actuators. The order stroke = working stroke + safety stroke of 2 x 20 mm. Please note, that during the initial set up, the actuator might exceed its nominal end position as given (over run "Dimension "X") in the drawing below. X X A AB + # Dimension "X" 10 mm for size 48/60 12 mm for size 80/100