
B-63783EN-1/01 7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL
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7.2.6 Optimum Torque Acceleration/Deceleration
Overview
This function enables acceleration/deceleration in accordance with the
torque characteristics of the motor and the characteristics of the
machines due to its friction and gravity. Usually, because of the
friction and gravity of the machine, the torque characteristics of the
motor, and other factors, the acceleration/deceleration performance
that is attainable (referred to as the limited acceleration/deceleration
curve) is not symmetrical with respect to the line separating the low-
and high-speed portions. This function enables
acceleration/deceleration in such a way that in positioning, the actual
acceleration curve follows the limited acceleration curve as closely as
possible. This makes the most of the capability of the motor, reducing
positioning time.
By setting limited acceleration curve data for each axis using the
appropriate parameter, this function performs linear type positioning
with acceleration/deceleration on the basis of limited acceleration
curve data in the state in which look-ahead acceleration/deceleration is
effective.
Velocity
Tim e
cceleration
Velocity
M o ve c o m m a n d a fte r
acceleration/deceleration
: Pattern sym m etrical with
res
ect to th e cen tra l lin e
ctual
acceleration
curve
Lim ited
acceleration curve
Fig. 7.2.6 (a) Conventional bell-shaped acceleration/declaration
Velocit
Tim e
cceleration
Velocity
ctual
acceleration
curve
Move comm and after
acceleration/deceleration
:Acceleration/deceleration
c u rv e fo llo w in g lim ite d
acceleration curve
Lim ited
acceleration
curve
Fig. 7.2.6 (b) Acceleration/deceleration with this function where the
actual acceleration curve follows the limited acceleration curve