Determining what kind of motor, would only be possible via Sunbeam or if an Elec/Mech knowledgeble CSer who is also a Sunbeam owner was prepared to pull apart his grinder and reply.
Alas, I no longer have mine.
Ive attached a link for the online sunbeam service centre [hope this is OK with the mods] but I have no idea how supportive or helpful theyll be since your enquiry may fall outside of ther scope/knowledge.
In any case, the cost of a 300watt-ish rated 240/110VAC converter may still be a prohibitive factor. [Grinder is rated @ 150watts]
As a suggestion, Advertise it, in our equipment for sale section and price it for a VERY quick sale. That way you may be able to instruct the ebay vendor to post it direct to the snobber.
As a $$$ guide EM0450s can be bought new for around/under $150Aust and a 5 day old EM0480 just sold on CS for $100Aust.