Rotor Core

Get a quote

In 3 steps to your individual offer for rotor laminations

Select the desired material, the number of pieces as well as the sheet thickness. If you have a technical drawing, attach it right away. Then we only need your contact details and we will send you an individual offer for your rotor laminations! If you need several blanks, you can simply submit the order form several times.

1. select material
2. Upload file attachment
3. provide contact information

Telephone consultation: +49 391 598184 70


Materials/ materials for electrical sheets

Electrical sheet 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:

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.

Production of rotor laminations for prototypes and small series

We manufacture rotor cores for the construction of rotors of electrical systems. The rotor is the moving part of the electrical system. For the use in prototype construction, or in small series, the production of rotor laminations by means of laser cutting is particularly suitable because of its flexibility, speed and economy. With our cutting systems, we manufacture rotor cores with the highest quality and tight tolerances up to a maximum diameter of 1,000 mm.

Elektroblech Laserschneiden Statorblech Lamelle TEPROSA
Elektroblech Laserschneiden Statorblech Lamelle TEPROSA
Elektroblech Laserschneiden Statorblech Lamelle TEPROSA

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.

Rotor Core Laser Cutting – Fast, Precise and Economical

Rotor laminations (also known as sheet laminations) are made of electrical steel, a special iron-silicon alloy. Due to its special properties, the use of laminations made of electrical steel strip for the production of iron cores leads to a significantly improved energy efficiency of electrical systems and thus to a sustainable use of resources.

Different cold-rolled strips are divided into grain-oriented and non-grain-oriented materials according to their properties. TEPROSA manufactures laser-cut sheet metal lamellae, as well as finished sheet metal packages for prototypes and small series.

In addition to the flexibility of the process, the advantages of laser cutting with regard to rotor production are particularly to be found in its cost-effectiveness. Since laser cutting does not incur any tooling costs and setup costs are low, production is cost-efficient even for very small quantities.

The exact laser beam guidance, the high power density and a high cutting speed enable highly precise contour accuracies of ± 0.01 mm, exact, almost right-angled cut edges and clean cut surfaces when using the appropriate cutting gases. Depending on the material thickness, narrow kerfs of 0.03 mm are also possible.

Furthermore, in contrast to alternative cutting processes such as punching, only very minor structural changes occur at the cutting edges during laser cutting.

Your supplier for rotor laminations

TEPROSA GmbH has specialized for many years in the manufacture of sophisticated, precision-fit laser parts of exceptionally high quality. In the field of electrical steel sheets, we manufacture individual rotor cores, sheets for stators and rotors, as well as complete sheet packages (stator or rotor packages) from various steel grades. We process grain oriented electrical steel for generators, transformers and other electrical machines.

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.

Coatings for insulation

To prevent short circuits between the laminations in electrical steel laminations and thereby reduce 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, improved insulation of the individual layers, heat resistance, improved punching properties or weldability.

  • Coating C3 – coating for improving the lubricating effect. Relevant, for example, for the stamping process.
  • Coating C4 – Coating to improve corrosion protection and insulation resistance.
  • Coating C5 – coating to optimize the temperature resistance. Relevant e.g. for stress relieving after the stamping process.
  • Coating C6 – Coating for a particularly high insulation resistance.
  • Backcoat – coating as a bonding technology for sheet packs and rotor cores
Teprosa – technology + Engineering

Paul-Ecke-Str. 6
39114 Magdeburg

Tel 0391 598184 70