Thanks to all who responded. We however have reached the same conclusion as UKpete. No one seems to have what we need off the shelf and if one is to be built specifically for this project we will do that in house.
Bob - you can certainly get help and components from some of the links mentioned. If I may give you my opinion - the 4-pole permanent magnet rotor brushless ac machine with hybrid bearings (ceramic ball) is a good starting point.
Calnetix (as mentioned by sreid) are worth talking to, they were a major supplier to one company I worked for, the product being a 100kW 90krpm 4-pole PM alternator with oil bearings. They do in-house both the PM rotors (including the retention sleeve - critical technology, they own the DuPont carbon-fibre process) and the stators, but beware of using magnetic bearings as that is a long-term development.
