Omron SYSDRIVE 3G3JV Series User Manual page 151

Using Inverter for Motor
Using Inverter for Existing Standard Motor
When a standard motor is operated with the Inverter, a power loss is lightly higher than
when operated with a commercial power supply.
In addition, cooling effects also decline the low-speed range, resulting in an increase in
the motor temperature. Therefore, motor torque should be reduced in the low speed
range.
The following figure shows allowable load characteristics of a standard motor.
If 100% torque is continuously required in the low-speed range, use a special motor for
use with Inverters.
Allowable Load Characteristics of Standard Motor
Torque (%)
High-speed Operation
When using the motor at high-speed (60 Hz or more), problems may arise in dynamic
balance and bearing durability.
Torque Characteristics
The motor may require more acceleration torque when the motor is operated with the
Inverter than when operated with a commercial power supply. Check the load torque
characteristics of the machine to be used with the motor to set a proper V/f pattern.
10-2
25% ED (or 15 min)
40% ED (or 20 min)
60% ED (or 40 min)
Continuous
Frequency (Hz)
Chapter 10