Appendix C How to Select the Right AC Motor Drive
|
VFD-VL
C-7
motor drive operates more than one motor, please pay attention to starting and changing
the motor.
Power Transmission Mechanism
Pay attention to reduced lubrication when operating gear reduction motors, gearboxes,
belts and chains, etc. over longer periods at low speeds. At high speeds of 50/60Hz and
above, lifetime reducing noises and vibrations may occur.
Motor torque
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
0320 60
120
60 seconds
continuous
Base freq.: 60Hz
V/f for 220V/60Hz
180
155
100
55
38
0320 60
120
to
rq
u
e (
%
)
Frequency (Hz)
Frequency (Hz)
60 seconds
60 seconds
continuous
to
rq
u
e (%
)
Base freq.: 60Hz
V/f for 220V/60Hz
130
140
100
85
45
35
0320 50
120
180
150
100
45
35
0
50
120
68
80
to
rq
u
e (%
)
to
rq
u
e (%
)
60 seconds
60 seconds
continuous
continuous
Frequency (Hz)
Frequency (Hz)
3 20
Base freq.: 50Hz
V/f for 220V/50Hz
Base freq.: 50Hz
V/f for 220V/50Hz
Call 1(800)985-6929 for Sales
deltaacdrives.com
Call 1(800)985-6929 for Sales
deltaacdrives.com
