The vector drive has nothing to do with the motor, a regular 3ph motor will run on a sensorless vector drive, I have done it all the time with the same results, it is a means by the VFD processor to detect the optimum phase angle for optimum control of the rotor, the drive 'takes an electronic picture' of where the rotor is in order for maximum efficiency.
The same goes for encoder feedback which BTW usually involves an add on card.
I have also used a regular 3ph motor with this encoder option.
A 'Vector Rated Motor' has usually a precisly balanced rotor for higher rpm's and also can have superior insulation qualities.
This is also verified by such as WEG and Baldor motors etc.
e.g. http://ecatalog.weg.net/files/wegnet...re-english.pdf
I have achieved the same result with regular motor.
Al.