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Silicon steel EI core, also known as electrical steel EI cores, serves as the fundamental building components of transformers, inductors, and other electrical devices. Composed of high-quality silicon steel, this core is intricately designed to minimize energy loss and maximize efficiency in electrical circuits, making it an indispensable material in the realm of electrical engineering. At Gnee Steel, we offer both grain oriented silicon steel ei core and non-oriented silicon steel ei core for sale. If you need, feel free to contact us~
Structure of Silicon Steel EI Cores
The “EI” refers to the shape of the core, which is formed in the shape of the letters “E” and “I” when viewed in profile. This configuration allows for efficient magnetic flux paths within the core while optimizing the space in the device.
E-Lamination: The “E” part of the core consists of a series of thin silicon steel laminations that are stacked together. These laminations are typically coated with an insulating material to reduce eddy current losses.
I-Lamination: The “I” part of the core is a single lamination that fits into the “E” laminations, completing the magnetic circuit. The “I” lamination is also made from silicon steel and is designed to enhance the magnetic coupling between the two parts.
The manufacturing process of silicon steel EI cores involves several steps:
1. Steel Production: Silicon steel is produced by alloying iron with silicon (typically 2-4% silicon) and other elements. The steel is then processed to achieve the desired magnetic properties.
2. Lamination Cutting: The silicon steel sheets are cut into thin laminations using precision cutting techniques. The thickness of the laminations is carefully controlled to optimize performance.
3. Insulation Coating: Each lamination is coated with an insulating material, such as varnish or oxide, to reduce eddy current losses. This coating is essential for maintaining the efficiency of the core.
4. Stacking and Assembly: The E and I laminations are stacked together to form the complete silicon steel EI core. The laminations are held in place using mechanical fasteners or adhesive bonding.
5. Final Processing: The assembled EI silicon steel core may undergo additional processing, such as annealing, to improve its magnetic properties and reduce residual stresses.
| Model | A | B | C | D | E | F | G | Hole(Φ) |
| 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 | 6.3 |
| 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 |
| EI-150 | 150 | 100 | 50 | 25 | 25 | 75 | 25 | 8.0 |
| EI-152.4 | 152.4 | 101.6 | 50.8 | 25.4 | 25.4 | 76.2 | 25.4 | 8.0 |
| EI-162 | 162 | 108 | 54 | 27 | 27 | 81 | 27 | 8.0 |
| EI-168 | 168 | 112 | 56 | 28 | 28 | 84 | 28 | 10.0 |
| EI-171 | 171 | 114 | 57 | 28.5 | 28.5 | 85.5 | 28.5 | 9.0 |
| EI-174 | 174 | 116 | 58 | 29 | 29 | 87 | 29 | 10.5 |
| EI-180 | 180 | 120 | 60 | 30 | 30 | 90 | 30 | 9.0 |
| EI-192 | 192 | 128 | 64 | 32 | 32 | 96 | 32 | 10.0 |
| EI-210 | 210 | 140 | 70 | 35 | 35 | 105 | 35 | 10.0 |
| EI-240 | 240 | 160 | 80 | 40 | 40 | 120 | 40 | 12.0 |
| EI-228* | 228 | 152 | 76 | 38 | 38 | 114 | 38 | 12.0 |
| EI-270* | 270 | 180 | 90 | 45 | 45 | 135 | 35 | 11.8 |
| EI-300* | 300 | 200 | 100 | 50 | 50 | 150 | 50 | 12.0 |
| EI-360* | 360 | 240 | 120 | 60 | 60 | 180 | 60 | 12.0 |
Note: Those with * are all manually punched.
Silicon steel EI core design provides numerous advantages that contribute to the overall performance and efficiency of electrical devices. They include:
1. Unique Shape
In essence, a silicon steel EI core typically consists of two symmetrical E-shapes or I-shapes joined together. The “E” section is usually slightly thicker and wider to accommodate the windings of the coil, while the “I” section fits into the “E” section to complete the magnetic circuit.
2. Laminated Construction
Silicon steel EI cores are typically built from laminated silicon steel sheets. The lamination reduces the formation of eddy currents, which, in turn, minimizes energy losses due to heating. This makes EI cores highly efficient for magnetic applications.
3. Excellent Magnetic Performance
Silicon steel’s unique magnetic properties make it an ideal material for constructing EI cores that exhibit high permeability and low hysteresis loss. This characteristic allows electrical devices equipped with silicon steel cores to operate at higher efficiencies with minimal heat dissipation during load variations. Furthermore, the ability of silicon steel to maintain its magnetization under varying frequencies makes it suitable for applications requiring stable performance across a wide range of operating conditions.
4. Improved Thermal Performance
The efficient design also helps dissipate heat effectively, reducing the risk of overheating and extending the lifespan of the device.
5. Compact Design
The E and I shapes allow for a compact design, which helps in optimizing space within electrical devices.
6. Ease of Winding
The design of the EI core facilitates easy winding of the coils, enabling efficient production processes. Besides, the silicon steel’s favorable magnetic characteristics also enable precise winding configurations within EI cores, enhancing the electromagnetic coupling between primary and secondary windings. This precision allows for optimized transformer designs with reduced leakage flux and improved voltage regulation capabilities.
7. Cost Effectiveness
Compared to other types of cores like amorphous metal cores, silicon steel EI cores are relatively inexpensive to manufacture and use, making them a popular choice for many applications.
Silicon steel EI cores are widely used in various applications, including:
1. Transformers: commonly used in power transformers, distribution transformers, isolation transformers, electronic transformers, etc. Their efficient magnetic properties help minimize energy losses and improve overall performance.
2. Inductors: widely used in inductors for power electronics, such as switch-mode power supplies (SMPS) and DC-DC converters. They help store energy and filter signals in these applications.
3. Electric Motors: applied in the stator and rotor of electric motors to enhance magnetic coupling and improve efficiency.
4. Chokes and Reactors: employed in chokes and reactors to control current and voltage in electrical circuits.
5. Magnetic Sensors: used in magnetic sensors and transformers for various sensing applications.
6. Electrical Devices: incorporated into various electrical devices requiring magnetic components, such as relays, solenoids, and switching devices.
