I want to buy a small AC generator motor of 5 watt. It should be small in size?
Suggest me from where can i purchase this?

 

5 watts at what voltage?

And how small is small?

How are you going to hook up to it rotationally? 1/8" round shaft or ???

DC would be a piece of cake since it would just be a hobby motor operating in reverse from normal, AC is however a different story as there really isn't any demand for such a device.

What do you plan to do with it or power from it?

The above may get a few of us iinto thinking.