Appendix C. How to Select the Right AC Motor Drive｜VFD-EL-W
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Special Motors
Pole-changing (Dahlander) motor:
The rated current differs from that of a standard motor. Check before operation and carefully choose
the capacity of the AC motor drive. When changing the number of poles, stop the motor first. If over-
current occurs during operation or the regenerative voltage is too high, let the motor free run to stop
(coast).
Submersible motor:
The rated current is higher than that of a standard motor. Check before operation and carefully
choose the capacity of the AC motor drive. A long motor cable between the AC motor drive and the
motor reduces the available motor torque.
Explosion-proof (Ex) motor:
Must be installed in a safe place and the wiring should comply with the (Ex) requirements. Delta AC
Motor Drives are not suitable for (Ex) areas that require special precautions.
Gear reduction motor:
The lubricating method of the reduction gearbox and the speed range for continuous operation are
different and depend on the motor brand. Carefully consider the lubricating method when operating
for a long time at low speed and for high-speed operation.
Synchronous motor:
The rated current and the starting current are higher than those of standard motors. Check before
operation and carefully choose the capacity of the AC motor drive. When one AC motor drive
operates more than one motors, pay attention to starting and changing the motor.
Power Transmission Mechanism
Pay attention to reduced lubrication when operating equipment such as gear reduction motors,
gearboxes, belts and chains over long periods at low speeds. At high speeds (60 Hz and above), noises
and vibrations that reduce the lifetime of the equipment may occur.
Motor Torque
The motor torque characteristics operated by an AC motor drive depend on the motor model selection
and AC motor drive parameter settings.
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