
3.SELECTING A MOTOR SPECIFICATIONS FOR THE αiS/αi SERIES B-65262EN/03
- 72 -
3.3.2.3 Mechanical specifications
Enter basic data that is required for selecting the motor.
For details on how to calculate each of the items, see Section 3.2.
- Movement per rotation of motor
Enter the movement of the machine tool when the motor rotates one
turn.
Example
- When the pitch of ball screw is 12 mm and the gear ratio is 2/3,
12mm × 2/3 = 8 mm
- When the gear ratio is 1/72 in rotary table ;
360° × 1/72 = 5°
- Least input increment CNC
Enter the least input increment of NC command. (The standard value
is 0.001 mm.)
- Rapid traverse rate
Enter the rapid traverse rate required for machine tool specifications.
- Motor speed in rapid traverse
Enter the motor speed during rapid traverse.
- Motor shaft converted load inertia
Enter a load inertia applied by the moving object reflected on the
motor shaft.
Do not include the inertia of the motor proper in this value. For
details on this calculation, see Subsec. 3.2.2.
In the case of a linear shaft, enter the load inertia calculated by logical
calculation if you enter the next item. In the case of a rotary shaft,
however, the load inertia cannot be calculated by logical calculation.
Enter values to two digits past the decimal point. (e.g. 0.2865 → 0.29)
- Inertia of coupling, reduction gear and pulley
Enter load inertia applied on transfer mechanisms other than
couplings, moving objects and ball screw.
Enter values to two digits past the decimal point. (e.g. 0.2865 → 0.29)