This paper presents a Direct Power Control (DPC) strategy for a variable speed Axial Flux Permanent Magnet Synchronous Generator (AFPMSG). The method consists on calculating the instantaneous power by measuring the machine currents and estimating the back electromotive force (emf). The real time back-emf estimation is based on tracking the no-load voltage through off-line harmonic analysis, and the mechanical position and speed, obtained with an incremental encoder. A 3kW laboratory prototype has been built to verify the performance of the proposed strategy. Experimental results are shown and discussed.