Is it possible to run a motor inside a black box by applying an EM field, without knowing anything about the motor?
Contact-less phone chargers use magnetic field coupling between the charger base and the "thing" to be charged and a few watts of power are easily transferable. This can easily activate a small motor. This relies of course on something being attached to the motor but if you truly "do not know anything about the motor" then that is likely to prove the killer because the motor may be stalled mechanically, broken etc..

Maybe you need to clarify this.