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3 BASIC FUNCTION
3.6 Electronic gear function
79
3
Ex.
Setting example for a ball screw
The following shows an example where the ball screw is moved at 10
μ
m per pulse.
Machine specifications
Ball screw lead Pb = 10 [mm]
Reduction ratio: 1/n = Z
1
/Z
2
= 1/2
Z
1
: Number of gear teeth on servo motor side
Z
2
: Number of gear teeth on load gear
Servo motor encoder resolution: P
t
= 4194304 [pulse/rev]
Therefore, set CMX = 1048576 and CDV = 125.
Ex.
Setting example for conveyors
The following shows the example of when the conveyor is rotated at 0.01° per pulse.
Machine specifications
Table: 360°/rev
Reduction ratio: 1/n = 625/12544
Servo motor encoder resolution: P
t
= 4194304 [pulse/rev]
Therefore, set CMX = 1644167168 and CDV = 703125.
If the servo motor rotates in one direction endlessly on systems such as an index table, the error in rounding
off accumulates, resulting in the index position mismatch.
For example, even if 36000 pulses are input for the command in the previous example, the following result is
obtained for the table. Therefore, a positioning to the same position cannot be performed on the table.
Reduce the value so that the calculated values before and after reduction are as close as possible.
4194304 [pulse/rev]
Pb = 10 [mm]
Z
1
1/n = Z
1
/Z
2
= 1/2
Z
2
1/n
Servo motor encoder resolution
CMX
CDV
=
Δ
L
0
•
=
Δ
L
0
•
P
t
Δ
S
= 10 × 10
-3
•
P
t
1/n • Pb
4194304
1/2 • 10
=
4194304
500
=
1048576
125
4194304 [pulse/rev]
Servo motor
Table
Timing belt: 625/12544
CMX
CDV
=
Δθ
° •
= 0.01 •
P
t
Δθ
4194304
625/12544 • 360
=
52613349376
22500000
=
1644167168
703125
36000 •
1642991168
703125
1
4194304
•
•
•
625
12544
• 360° = 360.0000001°
Содержание MELSERVO-JET MR-JET-G-N1 Series
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