In 3 steps to your individual offer for laminated cores

Use our online inquiry form to place your request for your laminated core at any time through our website without any additional effort. Simply upload your fabrication data to our server and deposit the material you require.

1. select material

2. Upload file attachment

3. provide contact information

Telephone consultation: +49 391 598184 70

Email: anfrage@teprosa.de

Materials/ materials for electrical sheets

The electrical sheet for a laminated core is made of iron-silicon alloy and is divided into grain-oriented and non-grain-oriented materials. The starting material is manufactured as cold-rolled strip. It has special physical properties and belongs to the soft magnetic materials. Non-grain oriented electrical steel is classified by DIN EN 10106. A large number of standard grades exist for use in electrical systems, motors and machines. Here is an overview of the materials we process at TEPROSA:

M235-35A
M270-35A
M330-35A
M235-50A
M270-50A
M330-50A
M530-50A
M400-65A
M800-65A
NO20-15
Other electrical steel grades on request

Manufacturing conditions

Our manufacturing conditions for laser cutting

Minimum kerf width/minimum spot diameter: 0.03 mm*
Repeat accuracy ±2µm
Micro-bridges from 0.03 mm (small connection between contour and sheet to anchor the blanks in the sheet composite)
Cutting speeds up to 50mm/s
Cutting gas support up to 25 bar
Nitrogen
Oxygen
Contour accuracy: ± 0.01 mm*

*Depending on the material/material and its thickness.

Individual manufacturing & materials

You do not find your material in our overview? We are also happy to process material provided by you or procure appropriate materials. On request, you will receive all materials with the corresponding material test certificate.

Information for buyers

We are specialized in business 2 businesst. Upon your request, you will promptly receive a written quote that takes into account all technical requirements. Here you will find further links and helpful information for buyers:

Request without CAD data

We will gladly take over the data creation for you! Simply send us a corresponding drawing or the geometric data of your rotor plate. Our experts will then contact you immediately.

Confidentiality & Data security

We guarantee the security of your data – if you still need a nondisclosure agreement in advance, you can >download our nondisclosure form here. We would also be happy to review your in-house agreement. To do so, please simply send it to us by e-mail at: einkauf@teprosa.de.

We take confidentiality and data security very seriously! If you would like to enter into a nondisclosure agreement, send us your form or download our template.

Your supplier for laminated cores

TEPROSA GmbH has specialized for many years in the manufacture of sophisticated, precisely fitting laminated cores of exceptionally high quality. In the field of electrical steel sheet, we manufacture individual laminations and sheets for stators and rotors, as well as entire sheet packages stator- or rotor packages) from various steel grades.

We process grain oriented electrical steel for generators, transformers and other electrical machinery. Our most common method for packaging the individual laminations is baked enamel technology. Alternatives are welding or bolting of laminations.
As a long-standing supplier to various OEMs, the quality of our work is particularly important to us. Therefore, we work according to uniform processes and thus ensure consistent quality and complete traceability of each individual production step.

Packaging of electric sheet metal lamellae into sheet metal packages

We pack sheet stacks from electrical steel laminations preferably with backcoat. In this process, the individual stator or rotor laminations are assembled into laminations packages, stator packages, rotor packages or core packages. The laminations manufactured by us by laser cutting are in most cases packaged using the baked enamel process. Alternative ways of packaging are welding or screwing the sheets into a sheet package.

We use state-of-the-art fiber lasers to manufacture the laminations. We cut stator and rotor laminations up to a maximum diameter of 1,000 mm. Our laser-cut laminations meet the highest quality and tolerance requirements and are particularly suitable for the production of prototypes and small series (1-10,000 individual laminations).

The bonding varnish process

Baking varnish is a special joining technology for laminations. Electrical steel strip with a baked enamel coating is baked into a sheet bundle in a single temperature step after the individual lamellae have been cut. The result is a flat, tight connection of the individual sheets with complete insulation. Sheet packs manufactured in this way exhibit high precision and perfect magnetic properties.

Advantages of the baked enamel process:

Precision – Sheet metal coated with baking varnish is baked over the entire surface. This means that even filigree lamellae can be precisely assembled.
Design freedom – Baked enamel allows for optimal design of the lamellae/sheet packages, as no package nubs or weld seams need to be considered.

Isolation – Packing with baked varnish does not result in short circuits, unlike other techniques of stacking.

Magnetic properties – With no other process do the magnetic properties of the electrical steel remain as unaffected as with the baking varnish process.

Jointing – Due to the full-surface connection of the individual lamellae, vibrations are reduced.

Heat conductivity – Electrical sheet packs with baked enamel coating exhibit improved heat conductivity.

Stability – Due to the full-surface connection, baked enamel packages are very stable and robust.

Coatings for insulation

To improve the properties of electrical sheets and to prevent the formation of eddy currents, various coatings are applied to the strip. The coating thicknesses vary from 1 to 4 µm. Depending on the processing technology and subsequent application, coatings exist for better corrosion protection, insulation of individual sheets, heat resistance, punching properties or weldability.

Coating C3 – coating to improve the lubricating effect. Relevant e.g. for the stamping process.

Coating C4 – Coating to improve corrosion protection and insulation

Coating C5 – coating to optimize temperature resistance. Relevant e.g. for stress relief annealing after the stamping process.

Coating C6 – Coating for better insulation.

Backcoat – coating as a bonding technology for sheet packs and core sheets

Our Laser Technology

For laser cutting, we use state-of-the-art fiber lasers from various manufacturers that enable contour accuracies of ± 0.01 mm. Fiber lasers provide excellent beam quality, deliver low thermal input, and thus enable high-precision laser cutting with low distortion and clean, virtually burr-free cut edges.

Laminated Core