Quote Originally Posted by scooterist007 View Post
You say that the motor can be wired up in star and delta but you only list 415v, this will be a dual voltage motor
Dual speed motors were fairly common in old machinery, and were fixed voltage - https://en.m.wikipedia.org/wiki/Dahl...changing_motor

With a VFD you would have to be careful you didn't change speed with the motor running, as it's likely to make even the best of VFDs fail (either fault out, or more likely just go pop!) with the current/phase synchronising involved when changing speeds.