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Résultats exploitables
The programmed pole generator is an electrical machine based on ceramic magnet programming technology; continuous printing of the desired number of poles on the rotor allows fixed output frequency independent of speed. The rotor of the machine is normally made of ceramic magnet (anisotropic ferrite pieces) with no slip rings or commutators. The machine can work in 2 modes of operation:
self excitation to feed power to an isolated grid;
grid excitation to feed power to the national grid.
The stator of the machine consists of an output winding and an exciter winding. The latter characterizes this machine and makes it different from others. Theoretically, the machine is useful as a generator over a wide speed range.
In the present design, in order to simplify the mechanical construction, the rotor was built inside the stator as a normal machine.
The machine was designed and developed in the University of Limerick for output power up to 2 kW, single phase, 50 Hz. Theoretical analysis was carried out together with simulation and compared with measurements from the machine itself. The main objective is the study of optimal design and performance of the machine, in particular, efficient writing of the poles on the rotor.
In parallel to the national grid operation (active load mode), automatic adjustment of the phase between the exciter voltage and the output voltage as a function of speed will provide a machine which will be optimally adapted to the wind turbine characteristic (ie the wind power can always be adapted to the generator characteristic for optimal operation at a broad speed range.
In the passive load mode of operation (isolated grid), the output voltage varies with speed and the output voltage regulation can be achieved by regulating the flux density of the exciter (variation of the exciter voltage in order to keep the output voltage constant).
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