APPENDICES
APP
−
68
APPENDIX 7 ELECTRONIC GEAR SETTING EXAMPLES
In addition to the electronic gear setting method explained in Section 4.2 Fixed
Parameters of this manual, this section provides various electronic gear setting
examples.
Use them as reference for parameter setting.
Basic concept of the electronic gear
The basic concept of the electronic gear is represented by the following
expression.
Electronic gear =
S (machine travel value per motor revolution)
A
P
(number of pulses per motor revolution)
∆
Replacing the electronic gear by the actually set A
P
, A
L
and A
M
gives:
=
S (machine travel value per motor revolution)
A
P
(number of pulses per motor revolution)
Number of pulses per motor revolution (A
P
)
Travel value per motor revolution (A
L
)
unit magnification (A
M
)
∆
Therefore, set the A
P
, A
L
and A
M
values with which the above relational
expression will hold.
However, since the values that may be set as A
P
, A
L
and A
M
have their
permissible ranges, the values calculated from the above relational expression
must be brought within the A
P
, A
L
and A
M
setting ranges.
(1) For ball screw + reduction gear
When the ball screw pitch is 10mm, the motor is the HC-MF (8192PLS/rev) and
the reduction ratio of the reduction gear is 9/44
Motor
Reduction gear 9/44
First, find how many millimeters the load (machine) will travel (
∆
S) when the
motor turns one revolution (A
P
).
A
P
(number of pulses per motor revolution)
= 8192 (PLS)
∆
S (machine travel value per motor revolution)= ball screw pitch
×
reduction ratio
=10(mm)
×
9/44
=10000.0(
µ
m)
×
9/44
When the control unit is mm,
the minimum command unit is
0.1
µ
m.
Substitute this for the above relational expression.
At this time, make calculation with the reduction ratio 9/44 remaining as a
fraction.
A
P
=
A
P
=
8192(PLS)
=
S
A
L
A
M
8192(PLS) 44
10000.0( m) 9
10000.0( m) 9/44
∆
