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Appendix C How to Select the Right AC Motor Drive|
Revision August 2008, 03VE, SW V2.04 C-7
The torque characteristics of a motor operated by an AC motor drive and commercial mains
power are different.
Below you’ll find the torque-speed characteristics of a standard motor (4-pole, 15kW):
AC motor drive Motor
180
155
140
100
80
55
38
0
320
60
120
60 seconds
Base freq.: 60Hz
V/F for 220V/60Hz
180
155
100
55
38
0
320
60
120
torque (%)
Frequency (Hz)
Frequency (Hz)
60 seconds
60 seconds
torque (%)
Base freq.: 60Hz
V/F for 220V/60Hz
130
140
100
85
45
35
0
3
20
50
120
180
150
100
45
35
0
50
120
68
80
torque (%)
torque (
%
)
60 seconds
60 seconds
Frequency (Hz)
Frequency (Hz)
3
20
Base freq.: 50Hz
V/F for 220V/50Hz
Base freq.: 50Hz
V/F for 220V/50Hz