Transformer Iron Core
Sep 28, 2025
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Transformer Iron Core Product Description
The transformer iron core is the key magnetic circuit component of a transformer. It is primarily made by stacking high-quality hot-rolled or cold-rolled silicon steel sheets with high silicon content and coated with insulating paint. Combining the core and the coils forms a complete electromagnetic induction system. The core's material and cross-sectional area determines the transformer's efficiency and power transmission capacity.
Key dimensional parameters of Transformer core design
- Core Cross-sectional Area
Determines the magnetic flux capacity of the core, usually calculated based on power and frequency requirements.
- Window Area
Provides space for the winding, directly affecting the layout and heat dissipation of the copper wire winding.
- Air Gap
especially for toroidal cores and C-shaped cores, the air gap directly affects the magnetic saturation point of the core.
- Stacking Factor
Indicates the ratio of the actual effective area of the core to the theoretical cross-sectional area, usually around 0.9.
Transformer Iron Core Key Components
Core Body: Made of electrical silicon steel, serving as the primary magnetic conductor.
Fasteners: Includes clamps, screws, ties, and pads for secure assembly.
Insulation Components: Includes clamp insulation, grounding plates, and insulating pads for enhanced safety
Transformer Iron Core Working Principle
Transformer cores operate under alternating current (AC) conditions, where energy loss, commonly known as iron loss, occurs. Iron loss is caused by two factors:
Hysteresis Loss: Results from the magnetization process in the core material. By using silicon steel with a narrow hysteresis loop, this loss is minimized, reducing heat generation.
Eddy Current Loss: Alternating magnetic flux induces circulating currents (eddy currents) in the core. These losses are reduced by using thin, insulated silicon steel sheets to limit current paths and increase resistance.
By optimizing core design and materials, PromiSIS minimizes energy losses, ensuring efficient transformer performance.
silicon steel Transformer Iron Core specifications
|
Category |
Details |
|
Material Grades |
Oriented silicon steel, customizable to meet specific transformer needs. |
|
Thickness Range |
0.20mm – 0.35mm |
|
Surface Finish |
Smooth and uniform with optional insulation coating. |
|
Applications |
Power transformers, distribution transformers, and other high-efficiency electrical systems. |
| Type | Grade | Width | Max Core Loss@P1.7T/50Hz | Lamination Factor(%) | Min Induction@B800 |
| Common Type | 23Q110 | 35-1200mm | 1.10w/kg | 97.2 | 1.82T |
| 23Q120 | 1.20w/kg | 97.2 | 1.82T | ||
| 27Q120 | 1.20w/kg | 97.5 | 1.82T | ||
| 30G120 | 1.20w/kg | 98 | 1.82T | ||
| High Induction Type |
B20P085 | 35-1200mm | 0.85w/kg | 97 | 1.86T |
| B23P085 | 0.85w/kg | 97.2 | 1.88T | ||
| B23P090 | 0.90w/kg | 97.2 | 1.88T | ||
| B23P095 | 0.95w/kg | 97.2 | 1.88T | ||
| B23P100 | 1.00w/kg | 97.2 | 1.88T | ||
| B27P095 | 0.95w/kg | 97.5 | 1.89T | ||
| B27P100 | 1.00w/kg | 97.5 | 1.89T | ||
| B30P120 | 1.20w/kg | 98 | 1.89T | ||
| Domain Refined High Induction Type(Laser) |
B20R070 | 35-1200mm | 0.70w/kg | 97 | 1.86T |
| B23R085 | 0.85w/kg | 97.2 | 1.88T | ||
| B27RK085 | 0.85w/kg | 97.5 | 1.89T |
GNEE Featured Products
Gnee provides premium iron cores to the world. Our cores can be selected in a wide range of materials, shapes, applications, manufacturing techniques, etc., to meet customers' diverse demands. Explore our wide product range now~
Manufacturing Process
1. Raw Material Sourcing
2. Slitting
3. Punching
4. Laminating
5. Core Forming
6. testing
GNEE EC
Founded in 2008 and located in Anyang in China, Gnee Electric is a high-tech enterprise specializing in researching and manufacturing iron core products.
The company currently occupies over 20,000 square meters and employs more than 200 people, including over 80 professionals. After more than 18 years of development, we have built our own magnetic material production base and independently develope, produce, and sell various kinds of iron cores. The common types include silicon steel cores, motor cores, transformer cores, toroidal iron cores, special-shaped cores, custom cores, and others. Our cores are widely applied in different sectors including transformers, motors, mutual inductors, voltage stabilizers, welding machines, magnetic amplifiers, and instrumentation, providing diverse core solutions to global customers.
30+
Types of Products
18k+
Happy Clients
Why Choose GNEE EC?
GNEE EC was founded in 2008, which is a National High-tech Enterprise & Famous Brand Enterprise in China, developing into a professional manufacturer and supplier of high-quality iron cores.
18+
Over 18 years of success in the iron core industry;
National High-tech Enterprise & Famous Brand Enterprises in China;
200+
Over 200 employees;
The R&D team has more than 80 experienced engineers and the production team has more than 100 skilled staffs;
35+
Annual turnover up to 35 million dollor per year;
Owns many sets of highly automatic winding, annealing, and assembling machines;
1,000+
Over 1000 customers in domestic and overseas markets;
core Products are exported to more than 70 countries in the world;
Gnee Iron Core Factory Overview
Meet Our Sales Manager
"The Core of the Iron Core, the Power of Leadership" - See Our Great Decision-Makers Deeply Engaged in the Magnetic Materials Industry.
Edison Zhang
CEO
Kelly Zhang
General Manager
Alex Cao
Sales Manager
Industries Served
Automobile Industry
New Energy
Transformer Applications
Our Mission
Strive To Create world-class Iron core brand
With 18 Years of industry experience, we focus on the research, development, and manufacturing of high-quality iron cores for electricity, industrial control, new energy, and automotive markets