High magnetic induction oriented silicon steel sheet is the main material that constitutes the transformer core.
The basic requirements for the transformer core material are low ferromagnetic loss at a certain frequency and magnetic flux density and high magnetic flux density at a certain magnetic field intensity. . The size of the no-load loss of the transformer is mainly determined by the material of the silicon steel sheet. In addition, it is related to the design and manufacturing process of the iron core.

Buyers can choose different types of EI silicon steel sheets according to specific needs, such as EI-28, EI-30, etc. Different models correspond to different size parameters and can be adapted to various types of motors and transformer equipment.
2/Main size parameters:
A size (external length) and B size (external width): This is the total size of the silicon steel sheet. Buyers usually choose the appropriate external dimensions based on the specifications of the equipment.
C, D, E dimensions: This is the width and spacing of the middle part of the silicon steel sheet, which is used to adapt to the internal structure of the equipment to ensure the best electromagnetic performance.
F and G dimensions: F is the height of the entire piece and G is the width of the side panels. These dimensions directly affect the tightness and stability of the silicon steel sheets during installation.
3/Aperture: The aperture size directly affects the convenience and stability of installation. Different models of aperture designs (such as 3.2, 3.5, 4.0, etc.) are suitable for different equipment needs.
Model | A | B | C | D | E | F | G | Hole |
EI - 28 | 28 | 21 | 8 | 4 | 6 | 17 | 4 | / |
EI - 30 | 30 | 20 | 10 | 5 | 5 | 15 | 5 | / |
EI - 35 | 35 | 24.5 | 10 | 5 | 7.5 | 19.5 | 5 | / |
EI - 38.4 | 38.4 | 25.6 | 12.8 | 6.4 | 6.4 | 19.2 | 6.4 | / |
EI - 38.4 | 38.4 | 44.8 | 12.8 | 6.4 | 6.4 | 38.4 | 6.4 | / |
EI - 41 | 41 | 27 | 13 | 6 | 8 | 21 | 6 | 3.2 |
EI - 42 | 42 | 28 | 14 | 7 | 7 | 21 | 7 | 3.5 |
EI - 48 | 48 | 32 | 16 | 8 | 8 | 24 | 8 | 3.5 |
EI - 50 | 50 | 34 | 14 | 9 | 9 | 25 | 8 | / |
EI - 54 | 54 | 36 | 18 | 9 | 9 | 27 | 9 | 3.5 |
EI - 57 | 57 | 38 | 19 | 9.5 | 9.5 | 28.5 | 9.5 | 4.0 |
EI - 60 | 60 | 40 | 20 | 10 | 10 | 30 | 10 | 3.5 |
EI - 66 | 66 | 44 | 22 | 11 | 11 | 33 | 11 | 4.5 |
EI - 75 | 75 | 50 | 25 | 12.5 | 12.5 | 37.5 | 12.5 | / |
EI - 76.2 | 76.2 | 50.8 | 25.4 | 12.7 | 12.7 | 38.1 | 12.7 | 5.0 |
EI - 78 | 78 | 52 | 26 | 13 | 13 | 39 | 13 | 5.0 |
EI - 78 | 78 | 53 | 22 | 14 | 14 | 39 | 14 | 5.0 |
EI - 84 | 84 | 56 | 28 | 14 | 14 | 42 | 14 | 5.0 |
EI - 85.8 | 85.8 | 57.2 | 28.6 | 14.3 | 14.3 | 42.9 | 14.3 | 5.0 |
EI - 96 | 96 | 64 | 32 | 16 | 16 | 48 | 16 | 6.2 |
EI - 105 | 105 | 70 | 35 | 17.5 | 17.5 | 52.5 | 17.5 | 6.0 |
EI - 108 | 108 | 72 | 36 | 18 | 18 | 54 | 18 | 5.5 |
EI - 114 | 114 | 76 | 38 | 19 | 19 | 57 | 19 | 7.0 |
EI - 120 | 120 | 80 | 40 | 20 | 20 | 60 | 20 | 7.0 |
EI - 126 | 126 | 84 | 42 | 21 | 21 | 63 | 21 | 14.0 |
EI - 132 | 132 | 88 | 44 | 22 | 22 | 66 | 22 | 7.0 |
EI - 133.2 | 133.2 | 88.8 | 44.4 | 22.2 | 22.2 | 66.6 | 22.2 | 7.0 |
EI - 144 | 144 | 98 | 40 | 26 | 26 | 72 | 26 | 7.0 |













