NON-ORIENTED ELECTRICAL STEEL SHEET AND MOTOR CORE COMPRISING SAME

A non-oriented electrical steel sheet according to one embodiment of the present invention comprises a steel sheet base material and an insulation film positioned on the steel sheet base material, satisfies the following formula 2 before stress relief annealing, and satisfies the following formula 3 after stress relief annealing, the steel sheet base material comprising, by wt%, 2.0-6.5% of Si, 0.1-1.3% of Al, 0.3-2.0% of Mn, 0.03% or less of Sn (excluding 0%), 0.02% or less of Sb (excluding 0%) and the balance of Fe and other inevitable impurities and satisfying the following formula 1. 0.030≥Sn+Sb≥0.0050.1≥Mnfilm/Mn5010≥Mnfilm/Mn50≥1 (In formula 1 to formula 3, [Sn] and [Sb] represent the amounts of Sn and Sb, respectively, [Mn film] represents the average amount (wt%) of Mn in the insulation film, and [Mn50] represents the amount (wt%) of Mn at a depth of 50 µm from the interface between the steel sheet base material and the insulation film toward the inside of the steel sheet base material.)