I need to lower the speed of a 415V 3 phase 6.3KW motor.
Would a VFD suffice ?
If so, what do I need to look for ?

 

Have no idea anything about these but here is what I found..
Do you have a price range ??
http://www.gohz.com/10hp-vfd

 

I need to lower the speed of a 415V 3 phase 6.3KW motor.
Would a VFD suffice ?
If so, what do I need to look for ?

@MaxHeadRoom seems to be an excellent know-it-all in this area.

 

@Dr.killjoy Good choice.
@MaxHeadRoom Where are thee ?

 

You need to look for a VFD rated for your motor HP.
Looks to be around 8hp.
I don't know what is available to you but the Hitachi offer a decent product at a fairly reasonable price.
I would stay away from the Chinese Huanyang etc.
Do you just need a fixed speed drop or variable?
Max.

 

Mostly fixed after adjustment

 

There are not too many ways to reduce rpm of an induction motor, generally for a system that requires just one fixed speed it is built in with some kind of mechanical reduction.
The VFD will certainly do it, and also has the features of pre-set speeds, in the case of the Hitachi it has up to 16 presettable.
Max.

 

I need to lower the speed of a 415V 3 phase 6.3KW motor.
Would a VFD suffice ?
If so, what do I need to look for ?

That will depend on the motor application and what it powers and how much you want to reduce the speed.

If it's a fixed speed reduction of a belt driven load just changing the motors drive pulley will be far cheaper and simpler to do then adding a VFD unit.