Thanks, confirms my worry then.

I assume any spindle then just runs at a lower voltage ....?

This was bought to fix the issue - http://www.ebay.co.uk/itm/Transwave-...vip=true&rt=nc - not cheap but that should work.

That's basically a motor being spun up and then 3 phase taken off it I assume.

How do these work? Look like some phase shifting of the transformer output to create a 'fake' 3 phase. Any good? http://www.ebay.co.uk/itm/4kW-Single...3D322379604644