
B--63003EN--1/02
9. SPINDLE SPEED FUNCTION
861
Example)
SPINDLE
MOTOR
Spindle
Position
coder
1: 1: 2
When the spindle motor, spindle, and position coder are
connected as shown left, let the variables be as follows:
E = 1.667 (V)
(A motor speed of 6000 rpm corresponds to 10
V. )
L = 360
(One rotation of the spindle corresponds to one
rotation of the spindle motor.)
α = La/4096
= 720/4096
= 0.17578
La = 720
(One rotation of the position coder corresponds
to two rotations of the spindle = 360 × 2.)
4096 = The number of detected pulses per
rotation of the position coder
¬ Gear ratio between the spindle and the position coder
1:1 0.08789 degrees...........
1:2 0.17578 degrees...........
1:4 0.35156 degrees...........
1:8 0.70313 degrees...........
Thus, Loop gain multiplier
= 2048 × 1.667/360 × 0.17578 × 1000 = 1667
NOTE
When the position coder which is built in a spindle motor
sends 512 pulses per rotation, the unit used for the
detection, a, is La/2048.
5300 In--position width of tapping axis in rigid tapping
[Data type] Word
[Unitofdata] Detection unit
[Valid data range] 1 to 32767
This parameter sets the in--position width of a tapping axis in rigid
tapping.
5301 In--position width of spindle in rigid tapping
[Data type] Word
[Unitofdata] Detection unit
[Valid data range] 0 to 32767
This parameter sets the in--position width of a spindle in rigid tapping.