No, but you might need a static of some kind.
I take it, that the rotor is build from a body, and three shapes?
You then need another body to attach this to, with a pivot joint. This other body can be anything, but if you just want it to "hang and rotate" on the screen, you often create a static body, you can attach these kind of objects to.
After that, it should be a trivial matter of applying force or torque to the body.