Technical Information
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and most of the available voltage. Motor manufacturers usually offer alternative windings, and care should
be taken to select the most appropriate.
Example:
Leadscrew Length: 80 in
Leadscrew Diameter: 1.5 in
Leadscrew Pitch: 2.54 in
Table Weight: 1000 lb
Linear Table Speed Required: 472 inches/min
Acceleration Time: 120 ms
D4 L
Inertia of Leadscrew: J = –––––– = 11.25 lb in2
36
W
Inertia of Table: J = –––––– = 3.88 lb in2
40 p2
Total inertia = 15.13 lb in2
Maximum Speed = 472"/min = 1200 rpm (equivalent to 4000 full steps/sec)
Acceleration Torque:
J
T = –––––– = 660 oz in (4.65 N m)
764t
This takes no account of motor inertia, so a suitable motor will be capable of producing around 1000 oz in
torque.
Again, as with stepper selection, it is recommended to add a 20% factor of safety so that unexpected dynamic
loads are easily handled by the motor.
Linear Table Driven by DC Motor
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