Mitsubishi Electric MELSERVO-JE Instruction Manual page 54

4. PARAMETERS
(a) Setting example of a ball screw
Machine specifications
Ball screw lead Pb = 10 [mm]
Reduction ratio: 1/n = Z
Z : Number of gear teeth on servo motor side
1
Z : Number of gear teeth on load side
2
Servo motor encoder resolution: P
CMX P
= t =
CDV ΔS
Note. Because the command unit is "pulse", α is 1.
Therefore, set CMX = 131072 and CDV = 5.
(b) Setting example of a conveyor
Machine specifications
Pulley diameter: r = 160 [mm]
Reduction ratio: 1/n = Z
Z : Number of gear teeth on servo motor side
1
Z : Number of gear teeth on load side
2
Servo motor encoder resolution: P
CMX P
= t =
ΔS
CDV
Note. Because the command unit is "pulse", α is 1.
Reduce CMX and CDV to within the setting range or lower and round off each value to the closest
whole number.
Therefore, set CMX = 16384 and CDV = 21.
/Z = 1/2
1 2
= 131072 [pulse/rev]
t
P 131072
t =
1/n Pb α (Note) 1/2 10 1
/Z = 1/3
1 2
= 131072 [pulse/rev]
t
P
t =
1/n r π α (Note) 1/3 160 π 1
1/n = Z /Z
1 2
Servo motor encoder resolution
131072 [pulse/rev]
131072
=
5
r = 160 [mm]
1/n
Z
2
1/n = Z /Z = 1/3
1 2
131072 131072
=
167.6
4 - 31
1/n
= 1/2
Z
2
Pb = 10 [mm]
Z
1
Servo motor encoder resolution
131072 [pulse/rev]
Z
1
16384
21