对于扭斜一定角度的铁芯，应按规定扭斜。
For the core with a certain angle of twist angle, the twist angle shall be as specified.
1.  扇形片组成的铁芯，必须按规定交叉叠放，片间应无搭接现象。对于分瓣铁芯（如直径超过3.25m的水轮发电机），要保证合缝间隙符合规定，以免磁通分布不均，造成噪音及附加应力。
1. The iron core composed of sector pieces must be overlapped according to the regulations, and there shall be no overlap between pieces. For the split core (such as the hydro generator with a diameter of more than 3.25m), it is necessary to ensure that the joint clearance meets the requirements, so as to avoid the uneven distribution of magnetic flux, resulting in noise and additional stress.
2.  铁芯轴向中心线位置应符合规定要求，以保证定转子磁中心对称。
2. The axial center line of iron core shall meet the specified requirements to ensure the magnetic center of stator and rotor is symmetrical.
3.  片间绝缘及铁芯损耗要稳定
3. The inter chip insulation and core loss shall be stable
依据电磁性能对铁芯质量的要求，最终表现是铁芯损耗的大小。一台良好的铁芯，应该具有足够的片间绝缘电阻，小而稳定的铁损耗。
According to the requirements of electromagnetic properties on the quality of iron core, the final performance is the core loss. A good iron core should have enough inter chip insulation resistance, small and stable iron loss.