It is of the utmost importance that you understand that the AC drive does not produce any torque; it does in fact not even produce one ounce of load moving torque.  All the mechanical force that moves your equipment and all of the mechanical force that is produced by the motor and drive system is produced by the AC motor alone.  The AC drive itself only provides the motor with the proper voltage and current necessary in a form that can be used by the AC motor.  The AC drive itself is only an electrical power supply.

The AC motor is the all-important prime mover.  If a particular AC motor does not have the capability to produce the required torque and speed there is absolutely nothing you can do to the drive, programmatically or otherwise, to enable the AC motor to power your equipment.  For this reason, proper motor selection is crucial when designing a motor-drive system. 

Another important thing to remember is to never match a high-efficient design motor to an AC drive.  Do not buy a high-efficient motor to operate on an AC drive, seeing as it will result in numerous complications.