Delta C200 Series User Manual page 27

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Chapter 3 How to Select the Right AC Motor Drive|C200 Series
different and depending on brand. The lubricating function for operating long time at low speed
and for high-speed operation needs to be considered carefully.
Synchronous motor:
5.
The rated current and starting current are higher than for standard motors. Please check before
operation and choose the capacity of the AC motor drive carefully. When the AC 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):
140
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AC motor drive
180
60 seconds 60 seconds
155
100
80
55
38
0 3 20
60
120
Frequency (Hz)
Base freq.: 60Hz
V/F for 220V/60Hz
60 seconds
140
130
100
85
68
45
35
0 3 20
50 120
Frequency (Hz)
Base freq.: 50Hz
V/F for 220V/50Hz
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180
155
100
55
38
0 3 20
V/F for 220V/60Hz
180
150
100
80
45
35
0
3 20
V/F for 220V/50Hz
3-6
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Motor
60 seconds
60
120
Frequency (Hz)
Base freq.: 60Hz
60 seconds
50 120
Frequency (Hz)
Base freq.: 50Hz
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