The easiest and quickest way is to look at the thickness, color, texture, and manufacturing process of the core.

1. Core thickness. The thinner the thickness, the better the quality. Since a good iron core is seamlessly rolled from an oriented cold-rolled silicon steel sheet (the sheet thickness is generally 0.35 mm or less), the thinner the thickness, the tighter the fit, and the lower the eddy current loss.

2. The color of the iron core. The quality of the iron core is generally gray, and the relatively inferior quality is generally white.

3. The texture of the iron core. The higher the quality of the iron core, the more dense the road

4. The manufacturing process of the iron core. Whether the surface of the iron core is smooth and flat, whether the thickness of the silicon steel sheet is uniform, whether the shearing opening has burrs or the like.