关键词: 半直驱, 风力发电机, 永磁体, 涡流损耗

Abstract: Taking a 6. 5 MW semi-direct drive permanent magnet wind generator as the research object, the magnetic cloud map and eddy current distribution cloud of four different arrangements of rotor permanent magnets ( straight, U-shaped, V-shaped, and W-shaped) were calculated and analyzed under the condition of sinusoidal stator current. The influence of stator current frequency on eddy current losses of permanent magnets was studied. The eddy current losses of
rotors with different arrangements of segmented permanent magnets were compared. The simulation results show that the permanent magnets arranged in a straight line have the highest eddy current losses, while the permanent magnets arranged in a U-shape and V-shape have lower eddy current losses. The eddy current loss of permanent magnets increases with the increase of electrical frequency. After dividing the permanent magnets in each pole into an average of 12 pieces, the V-shaped permanent magnet has the highest reduction rate of eddy current loss, which is 74. 9%, while the straight shaped permanent magnet has the lowest reduction rate of eddy current loss, which is 50. 8%.