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Gearmotor
The speed range for continuous operation differs according to the lubrication method
and motor manufacturer. In particular, continuous operation of an oil-lubricated motor in
the low speed range may result in burning. If themotor is tobeoperated ata speedhigh-
er than 60 Hz, consult with the manufacturer.
Synchronous Motor
Thismotorisnotsuitablefor Inverter control. Ifagroupof synchronous motors is individ-
ually turned on and off, synchronism may be lost.
Single-phase Motor
This motor is not suitable for Inverter control. It should be replaced with a three-phase
motor.
Power Transmission Mechanism (Speed Reducers, Belts,
Chains, and so on)
If an oil-lubricated gearbox or speed reducer is used in the power transmission mecha-
nism, note that oil lubrication will be affected when the motor operates only in the low
speed range. Note also that the power transmission mechanism will make noise and
experience problems with service life and durability if the motor is operated at a speed
higher than 60 Hz.
Chapter 7
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