Electromagnetic-force study of permanent magnet about large permanent magnet generator in wind-power

Jinfeng 62(1.2MW) permanent magnet synchronous generator (PMSG) two dimensional (2D) model constituted according to a pair of magnet pole area. Basic hypothesis and boundary condition presented. Abrupt three-phase short circuit current was calculated, including diversified electromagnetic field and electromagnetic force that exert on PM when generator operates normally and fault happened. The effect to electromagnetic force was found by calculating current and air gap and phase angle verified. Indicate: generally electromagnetic force is demagnetization and baffle rotor to revolve. Electromagnetic force exert on PM will increase if air gap decrease. Electromagnetic force decreases if current decrease too. PM get furthest repulsive force when three-phase short circuit happened, compute tangential and radial force. Compare with experiment rated data, show resin intensity can fulfil request. Result can offer proof for resin intensity proofread and generator design.