7. Feed Functions
7.8 Rapid Traverse Constant Inclination Multi-step Acceleration/Deceleration
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7.8 Rapid Traverse Constant Inclination Multi-step Acceleration/Deceleration
Function and purpose
This function carries out the acceleration/deceleration according to the torque characteristic of the
motor in the rapid traverse mode during automatic operation. (This function is not available in
manual operation.) The rapid traverse constant inclination multi-step acceleration/deceleration
method makes for improved cycle time because the positioning time is shortened by using the
motor ability to its maximum.
In general, the servomotor has the characteristic that the torque falls in the high-speed rotation
range.
0
1000
3500
Rotation speed [r/min]
0
25
100
125
75
T
o
rq
ue [N
・
m]
50
2000
3000
(Note)
This characteristic is data at input voltage 380VAC.
In the rapid traverse constant inclination acceleration/deceleration method, the acceleration has
been treated constantly because this torque characteristic is not considered. So, It is necessary to
use a minimum acceleration within the used speed range. Therefore, the margin of acceleration
must be had in a low-speed range. Or if the acceleration is used to its maximum, the upper limit of
the rotation speed must be slowed.
Then, to use the servomotor ability to its maximum, acceleration/deceleration to which the torque
characteristic is considered is carried out by the rapid traverse constant inclination multi-step
acceleration/deceleration method.
The acceleration/deceleration patterns in the case where rapid traverse constant inclination
multi-step acceleration/deceleration are performed are as follows.