Bob La Londe wrote:

VFDs & 3 Phase Motors

All-righty then. This may sound stupid, but when you run a 3 phase motor
off of a VFD what is your speed range relative to the original speed of
the motor?

Approximately of course. Mileage will vary I am sure.
Depends a bit on the motor and more on the VFD. Flux vector VFDs
(more expensive) can run down to zero RPM at full torque, if the motor
has adequate forced cooling. For general purpose motors and VFDs,
you can usually go to 50% RPM (watch out for motor overheating)
up to 200% rated RPM. You get constant torque below rated speed,
and constant HP above.

Jon