Due to Earth's limited energy source, is there any machine that can generate energy by itself ?

There is no such thing as a perpetual motion machine, since that violates the laws of thermodynamics. Any continuous motion bust be fueled by some sort of energy input. There exist in the universe good approximations of perpetual motion, such as the rotation of planets; but even that has a small degree of friction due to gravitational tidal forces. As well, this motion does not GENERATE any energy, it merely SUSTAINS the energy that already exists there. No process of any kind can create or destroy energy, energy can only be changed from one form to another with at most 100% efficiency.
So, not only is there “no such machine yet”, you can be absolutely certain there will NEVER EVER be such a machine.

It’s called ‘perpetual motion’.
The concept of perpetual motion machines violates pretty much every rule of thermodynamics and energy conservation that we know of. So…no it’s not possible. The energy must come from somewhere.

It’s perpetual motion, and since some of the energy is lost as heat, there is no such thing as a perpetual motion machine, although some attempts have been made in the past.

if your view is at energy generation , sun rays is the best source to generate solar energy.

Energy can’t be generated.
Energy is only transformed from one form to another. It’s called perpetual motion