Mitsubishi Electronics MDS-R ユーザーズマニュアル

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Appendix 2. Selection 
 
 
 
 
 
A2 - 14
Appendix 2-3-3  Servo selection results  
 
As a result of the servo selection calculations, the servo specifications for the Z axis of this machining 
center have been determined. 
Item Type 
Servo drive unit 
MDS-R-V1-80 
Servomotor HF203B
 
Regenerative resistor unit 
MR-RB30 
 
The 
 in the motor type will be decided based on separate machine specifications such as motor shaft 
shape and absolute position system.  
The following table shows the servo selections for all axes. 
Item 
Unit 
X axis 
Y axis 
Z axis 
Axis type 
 
Linear 
Linear 
Linear 
Movement direction 
 
Horizontal Horizontal  Vertical 
Table support method 
 
Rolling 
Rolling 
Rolling 
Table movement friction coefficient 
 
 
 
 
 
Ball screw diameter 
mm 
50 
50 
50 
Ball screw length 
mm 
1200 
1000 
1000 
Ball screw lead 
mm 
10 
10 
10 
Deceleration ratio 
 
2/3 
Primary side gear inertia 
kg.cm
2
 
 
 1.6 
Secondary side gear inertia 
kg.cm
2
 
 
 8.1 
Motor/ball screw connection section inertia 
kg.cm
2
 
10.0 10.0 
 
Mass of moving object installed on the machine 
(table, etc.)  
kg 600 
500 
500 
Mass of standard-added-moving object 
(workpiece, etc.) 
kg 100 
100 
10 
 
 
 
 
 
Rapid traverse rate 
mm/min
30000 
30000 
20000 
Target acceleration/deceleration time constant 
ms 
120 
120 
100 
Rapid traverse positioning frequency 
times/min
12 
12 
12 
Motor brake 
 
Without 
Without 
With 
 
 
 
 
 
Motor shaft conversion rotation load inertia 
kg.cm
2
 
67.4 57.9 26.5 
Motor shaft conversion linear movement load 
inertia 
kg.cm
2
 
17.7 15.2  5.7 
Motor shaft conversion total load inertia 
kg.cm
2
 
85.1 73.1 32.2 
Motor inertia 
kg.cm
2
 
38.3 38.3 47.9 
Motor shaft conversion load inertia magnification
-fold 
2.22 
1.91 
0.84 
 
 
 
 
 
Motor shaft conversion unbalance torque  
N.m 0.0 
0.0 
5.3 
Motor shaft conversion friction torque 
N.m 0.55 
0.47 
0.27 
Motor shaft conversion total load torque 
N.m 0.55 
0.47 
5.57 
 
 
 
 
 
Motor speed during rapid traverse 
r/min 
3000 
3000 
3000 
Rapid traverse minimum 
acceleration/deceleration time constant 
ms 118.1 
106.4 
90.5 
Maximum torque during motor stop 
N.m 0.55 
0.47 
5.57 
Maximum load rate during motor stop 
4.0 
3.4 
40.7 
 
 
 
 
 
Regenerative energy per braking (per cycle) 
852.3 (total of X, Y axes) 
1470.6 
MR-RB30 tolerable positioning frequency times/min
16.8 
16.8 
19.6 
MR-RB50 tolerable positioning frequency times/min
28.2 
28.2 
32.6 
 
 
 
 
 
Servo drive unit type 
 
MDS-R-V2-8080 
MDS-R-V1-80 
Servomotor type 
 
HF203
 HF203 HF203B 
Regenerative resistor type 
 
MR-RB30 
MR-RB30