
2.EXPLANATION OF OPERATION MODES FANUC AC SPINDLE MOTOR αi series B-65280EN/05
- 72 -
(d) t
4
is the time from the start of deceleration until orientation
has been completed.
Let the orientation completion width be within ±10 pulses.
Then, t
4
can be calculated as follows:
10
Rori4096
ln
PG
1
t
4
×
×=
(e) Therefore, the orientation time t[sec](=t
1
+t
2
+t
3
+t
4
) can be
expressed as follows:
10
Rori4096
ln
PG
1
RoriPG
3
tt
10
Rori4096
ln
PG
1
RoriPG
1
t
11
×
+
×
+≤≤
×
+
×
=
(2) Once the one-rotation signal has been detected (second and
subsequent orientations)
(a) Once the one-rotation signal has been detected, the time
required to detect the signal is no longer necessary.
Therefore, when orientation is started from the rotating state,
orientation time t[sec](=t
1
+t
3
+t
4
) is expressed as follows:
10
Rori4096
ln
PG
1
RoriPG
1
tt
10
Rori4096
ln
PG
1
t
11
×
+
×
+≤≤
×
=
(b) Whenever orientation is started from the stop state,
orientation must be completed and the stop state entered
within one rotation. In this case, the orientation time t [sec]
is expressed as follows:
10
Rori4096
ln
PG
1
RoriPG
Rori1
t0
×
+
×
−
≤≤
(3) Calculation examples
Time required to achieve the orientation speed t
1
= 0.5 [sec]
Position gain PG = 20 [sec
-1
]
Motor speed limit for orientation Rori = 0.33 (= 33%)
(a) Orientation time before the one-rotation signal has been
detected
[sec]196.1t[sec]896.0
10
33.04096
ln
20
1
33.020
3
5.0t
10
33.04096
ln
20
1
33.020
1
5.0
≤≤∴
×
×+
×
+≤≤
×
×+
×
+
(b) Orientation time when orientation is started from the
rotating state (once the one-rotation signal has been
detected)
[sec]896.0[sec]746.0
10
33.04096
ln
20
1
33.020
1
5.0
10
33.04096
ln
20
1
5.0
≤≤∴
×+
×
+≤≤
×+
t
t
(c) Orientation time when orientation is started from the stop
state (once the one-rotation signal has been detected)
[sec]346.0t[sec]0
10
33.04096
ln
20
1
33.020
33.01
t0
≤≤∴
×
+
×
−
≤≤