For an iron core, the core sheet is required to be flat, no waves, should be vertical after standing up, not skewed, the order is clear, the joint is tight, correct, the edge of the piece without short circuit, etc., in order to ensure the electromagnetic performance of the iron core. If the core pack quality is not good, it will affect the electromagnetic and mechanical properties of the core.
The deflection of the core will cause difficulties in winding installation and may also cause insufficient insulation distance in the winding.
The joint of the core sheet causes large no-load current, and the mechanical strength is weakened.