[r/min]
Time
[N·m]
Time
t1 t2 t3 t4
0
Acceleration/
Deceleration
torque
Rotation
speed
[N·m]
Time
0
Load
torque
TA
Combined
torque
Time
0
T1
TL
T2
T3
T4
N
1 cycle
[N·m]
• Effective torque T
RMS
[N·m]
TRMS[
N·m]
=
=
Σ(Ti
2
·ti)
Σti
T
1
2
·t1 + T2
2
·t2 + T3
2
·t3 + T4
2
·t4
t1 + t2 + t3 + t4
• Maximum torque T
MAX
[N・m] = T
1
= T
A
+T
L
Motor selection
Based on the above calculation results, select the motor capacity by using the following formulae.
Select the larger of the two calculated values as the motor capacity. Also, when selecting a motor,
take into consideration the errors in calculation and modeling. Select a motor whose capacity is at
least approximately 20% larger
.
• Motor capacity conversion to effective torque
Motor capacity [kW] = × 10
-3
60
2π · T
"#$ · N
N : Maximum rotation speed [r/min]
• Motor capacity required for maximum torque output
Motor capacity [kW] = × 10
-3
60 × 1.5
2π · T
"#$ · N
N : Maximum rotation speed [r/min]
Note
The above calculation formulae assume that the maximum motor toque is 150% of the rated torque.
A-4-2
Inverter Capacity Selection
Select an inverter that can be used with the motor you selected based on the result of motor capacity
selection.
Appendix
A-13
M1 Series Standard Type User's Manual (I669)
A-4 Overview of Inverter Selection
A
A-4-2 Inverter Capacity Selection
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