7-2
7-1 Notes on Using Inverter for Motor
H Using Inverter for Existing Standard Motor
When a standard motor is operated with this Inverter, a power loss is slightly higher than
when operated with a commercial power supply.
In addition, cooling effects also decline in the low-speed range, resulting in an increase
in the motor temperature. Therefore, motor torque should be reduced in the low speed
range.
The figure on the right-hand side 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
25% ED (or 15 minutes)
40% ED (or 20 minutes)
60% ED (or 40 minutes)
Continuous
Frequency (Hz)
Torque (%)
D High-speed Operation
When using the motor at a high speed (60 Hz or more), note that problems may arise in
dynamic balance, bearing durability, and so on.
D Torque Characteristics
When the motor is operated with the Inverter, torque characteristics differ from when
operated with a commercial power supply. Check the load torque characteristics of the
machine to be used with the motor.
Appendix A Chapter 7
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