Appendix d, Application notes, Minimum speed – Rockwell Automation 20M LPM15 Liquid-Cooled Adjustable Frequency AC Drive FRN 2.xxx User Manual
Page 111: Motor control technology, Torque producer
Appendix
D
Application Notes
Minimum Speed
Refer to
Reverse Speed Limit on page D-8
Motor Control Technology
The LPM15 drive provides several motor control technologies:
• Torque Producer
• Speed Regulator
Torque Producer
Volts/Hertz
This technology follows a specific pattern of voltage and frequency output
to the motor, regardless of the motor being used. The shape of the V/Hz
curve can be controlled a limited amount, but once the shape is determined,
the drive output is fixed to those values. Given the fixed values, each motor
will react based on its own speed/torque characteristics.
This technology is good for basic centrifugal fan/pump operation and for
most multi-motor applications. Torque production is generally good.
Sensorless Vector
This technology combines the basic Volts/Hertz concept with known motor
parameters such as Rated FLA, HP, Voltage, stator resistance and flux
producing current. Knowledge of the individual motor attached to the drive
allows the drive to adjust the output pattern to the motor and load
For information on…
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