Some things to be aware of with Variable Speed Drives.
1) The motors may need higher voltage rated insulation due to the harmonics present on the output of the VFD.
2) The distance between the VFD and the motor is usually limited to less than 100 feet.
3) Depending on the design of the VFD, you MAY need inductors either on the input to the VFD or between the VFD and the motor.
4) The motor may need to have insulated bearings installed to stop the induced current on the shaft from arcing thru the bearings to frame ground.
5) You MAY need special cabling between the VFD and the motor.
I am not trying to discourage you from using VFDs, I am just trying to make you aware of possible pitfalls.
Larry C
