It depends on what you would like to us the drive for.
If you only require it for the spindle at close to synchronous speed then you can use a normal motor,
but if you are using it for a low rpm, high rpm or constant start/stop operation then it is better to use an inverter motor
which has seperate windings for the cooling fan or use an external cooling fan - at high rpm the motors fan will draw higher
current from the motor and may even stall the motor.
Regards
KTM