Transformer Core
Sep 17, 2025
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Transformer Core Product Description
A transformer core is a structure of thin laminated sheets of ferrous metal (most commonly silicon steel) stacked together, that the primary and secondary windings of the transformer are wrapped around.
The densely packed laminated sheets that cores are constructed from, reduce overheating and circulating currents in the core. This lowers the transformers energy loss. Further increases in core design are made through cold rolling, annealing, and using grain oriented steel.
Removing any air gaps between the laminations will result in a higher efficiency as well. A core design with large gaps between laminated sheets will yield higher no load or iron losses and a lower efficiency.
Silicon Steel Core for Single Phase Transformer
Amorphous Rolled Transformer Core
Silicon Steel Core for Dry-type Transformer
Silicon Steel Core for Oil Immersed Transformer
Transformer Core styles
laminated(stacked) and wrapped (distributed gap) cores
- Distributed Gap Core
Commonly referred to as a wrapped core, this core design is used in 3-ph and 1-ph distribution transformers. Distributed gap cores utilize a simple core clamp design which leads to faster assembly times and lower manufacturing costs. Another advantage of the distributed gap design is that there is only one cut per layer of laminated sheet.
This type of core configuration is also referred to as a shell since the windings are surrounded by the core. As we mentioned earlier, this shell type design typically yields lower transformer losses. It's efficient and lower cost design makes it the ideal choice for distribution transformers.
- Laminated Core
shell type and core type
- core type
- shell type
Amorphous & Nanocrystalline Cores
Known as tape wound cores, these amorphous core designs employ densely packed ribbon-like strips of highly permeable metallic-glass material. This makes for a more brittle core construction, but a higher efficiency. To keep the sheets together, amorphous cores are often encased in epoxy, or taped together.
The no load losses are lower and core saturation levels are higher than conventional core designs. Amorphous cores are more costly than conventional cores, but their higher efficiency makes them a popular choice for special, custom applications.
There will be some loss of energy with any core configuration, but the better the core design, the less the no load losses. A well built transformer core help offset operating costs of the transformer and extend its lifespan.
Transformer Core Application
Iron core products are mainly used to produce 110kV and below, 30000 kVA and below series of oil-immersed transformer iron cores, 35kV and below dry-type transformer iron cores and other products.
Iron cores: according to the iron core lap mode, there are straight seam, half straight seam, half inclined seam and full seam; according to the layered winding can be divided into 3 steps, 5 steps and 7 steps.
The products can be customized according to the special requirements of customers.
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