Chapter 7
7-7
Appendix
Calculating the Combined Torque and Effective Torque
• Effective torque T
RMS
(N·m)
• Maximum torque T
MAX
(N·m) = T1 = TA + T
L
●
Selecting the Motor
Select the motor capacity by putting the results of the calculations above into the following equations.
Calculate the motor capacities from the following two equations and use the larger of the two results
as the motor capacity. Furthermore, when selecting the motor, add at least 20% to the motor capac-
ity result to allow for calculation error and errors due to model changes.
Motor Capacity Equivalent to Effective Torque
Motor Capacity Required to Output the Maximum Torque
Note
The motor's maximum torque is calculated as 150% of the rated torque.
Time
(r/min)
Time
(N·m)
0
Time
0
Time
0
Speed
(N·m)
(N·m)
Load torque
Combined torque
t1
T
A
T
L
T1
T2
T3
T4
t2
t3
t4
1 cycle
N
Acceleration/
deceleration
torque
Σ
(T
i
2
·t
i
)
Σ
ti
=
T1
2
·t1 + T2
2
·t2 + T3
2
·t3 + T4
2
·t4
t1 + t2 + t3 + t4
=
2
π
·T
RMS
·N
60
N: Max. speed (r/min)
Motor capacity (kW) =
×
10
−
3
2
π
·T
MAX
·N
60
×
1.5
N: Max. speed (r/min)
Motor capacity (kW) =
×
10
−
3
Содержание EasySpeed 3G3JE
Страница 1: ...3G3JE Compact Simplified Inverters Cat No I547 E1 02 USER S MANUAL...
Страница 3: ...USER S MANUAL 3G3JE Compact Simplified Inverters...
Страница 18: ...Table of Contents XVI...
Страница 19: ...Chapter 1 Overview 1 1 Functions 1 2 Nomenclature...
Страница 23: ...Chapter 2 Design 2 1 Installation 2 2 Wiring...
Страница 86: ...Chapter 3 3 26 Operation...
Страница 100: ...Chapter 4 4 14 Maintenance Operations...
Страница 101: ...Chapter 5 Specifications 5 1 Inverter Specifications 5 2 Option Specifications...
Страница 112: ...Chapter 5 5 12 Specifications...
Страница 113: ...Chapter 6 Parameter Tables...
Страница 118: ...Chapter 6 6 6 Parameter Tables...
Страница 119: ...Chapter 7 Appendix 7 1 Selecting the Inverter 7 2 Precautions on Using the Inverter for a Motor...
Страница 130: ...Chapter 7 7 12 Appendix...
Страница 132: ...R 2 Revision History...