
B-65262EN/03 SPECIFICATIONS FOR THE αiS/αi SERIES 3.SELECTING A MOTOR
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3.3.2.4 Motor specifications and characteristics
- Motor type
Enter the motor type, if desired.
- Pulsecoder
Enter the specifications (absolute or increment, number of pulses:
1,000,000 or 16,000,000) of the feedback sensor (Pulsecoder) built
into the motor.
- Shaft shape
Enter the shape of the motor shaft.
- Brake (Yes/No)
Enter whether or not the motor has a brake.
- Feed-forward during rapid traverse
Enter whether or not feed-forward control during rapid traverse is
used.
Generally, feed-forward control can reduce the delay time in
executing servo commands. However, overheating of the motor is
more likely to occur as a higher torque is required for acceleration/
deceleration.
Since mechanical shock increases in linear acceleration/deceleration,
the bell-shaped acceleration/deceleration or fine acceleration/
deceleration (FAD) function is generally used together with feed-
forward control.
- Acceleration/deceleration time constant at rapid traverse
Enter the acceleration/deceleration time constant in rapid traverse.
The acceleration/deceleration time is determined according to the
load inertia, load torque, motor output torque, and working speed.
The acceleration/deceleration mode in rapid traverse is linear
acceleration/deceleration or feed-forward during rapid traverse + bell-
shaped acceleration/deceleration. Enter T
1
only for linear
acceleration/deceleration or T
1
and T
2
for feed-forward during rapid
traverse + bell-shaped acceleration/deceleration.
Linear acceleration/deceleration
Speed
Time
t
a
t
a
V
m
When cutting feed is important, enter the time constant in cutting feed.
The acceleration/deceleration mode in cutting feed is linear