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7-1 Notes on Using Inverter for Motor
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 (%)
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.
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.
Chapter 7
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