When magnetic saturation sets in, the machine performance will not increase much even the magnetomotive force (MMF) is increased. You can understand these limits of the steel used in the machine by looking at the BH-curve of the steel. The knee point where the curve starts becoming parallel to X axis (H) is where the steel starts saturating
A saturated core requires more magnetizing current. This will increase I2R loss in the winding thus overheating the machine.
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