Name: Teprosa
Address: Paul-Ecke-Str. 6, Magdeburg, 39114, Deutschland
Telephone: 0391 598184 70

GET YOUR INDIVIDAL OFFER FOR LASER CUTTING OF ELECTRICAL SHEETS IN 3 STEPS

Select the material, the quantity and the sheet thickness. If you already have a technical drawing, you can upload it to our server. Wwe only need your contact details to send you an individual offer for laser cutting contract manufacturing! If you need several lamellas, you can simply send off the order form several times.

1. Choose your material

2. Upload technical drawing

3. Provide contact details

Phone: 0391 598184 70

E-Mail: anfrage@teprosa.de

» Material for electrical sheets

Electrical steel consists of an iron-silicon alloy and is divided into grain-oriented and non-grain-oriented material. The starting material is manufactured as cold strip. It has special physical properties and is one of the soft magnetic materials. Non-oriented electrical steel is classified by DIN EN 10106. There is a wide range of standard grades for use in electrical systems, motors and machines. Here you will find an overview of the materials that we process at TEPROSA:

M235-35A
M270-35A
M330-35A
M235-50A
M270-50A
M330-50A
M530-50A
M400-65A
M800-65A
NO20-15
More on request

» Manufacturing conditions

Our manufacturing conditions for laser cutting

Minimum kerf width/ minimum spot diameter: 0.03 mm*
Repeatability ±2µm
Micro bridges from 0.03 mm
Cutting speeds up to 50mm/s
Cutting gas support up to 25 bar
nitrogen
oxygen
Contour accuracy: ± 0.01 mm*

*depending on specific material and its thickness

» Individual production

Can’t find your desired material in our overview? We are also happy to process material provided by you or procure appropriate materials. On request, you can receive all materials with the corresponding material test certificate.

» Purchasing information

We specialize in the business-2-business. Upon your request, you will immediately receive a individual offer that takes all technical requirements into account. Here you will find further links and helpful information for purchasers:

» Request without CAD data

We are happy to take over the data creation for you! Simply send us a corresponding drawing or the geometric data of your laser part. Our experts will then contact you immediately.

» Secrecy & data security

We guarantee the security of your data – if you still need a non-disclosure agreement in advance, you can download our non-disclosure form >here. We would also be happy to review your in-house agreement. Please send us this simply by e-mail to: einkauf@teprosa.de

We take confidentiality and data security very seriously! If you would like to conclude a non-disclosure agreement, send us your form or download our template.

Laser cutting of laminations for the production of magnetic cores

We manufacture electrical steel laminations for the production of magnetic cores in the form of rotors, stators or transformers. We use the latest fiber lasers to manufacture the laminations. We cut stator and rotor sheets up to a maximum diameter of 1,000 mm.

Our laser-cut sheet metal lamellas meet the highest quality and tolerance requirements and are particularly suitable for the manufacture of prototypes and in the production of small series (1-10,000 individual lamellas).”

“Laser cutting of electrical steel – an advantageous cutting process for a special material

Electrical sheet or electrical steel is an iron-silicon alloy and the steel material of choice for manufacturing magnetic cores as rotors or stators in electrical machines. Due to its special properties, the use of laminations made of electrical steel for the production of iron cores leads to a significantly improved energy efficiency of the electrical systems and thus to a sustainable use of resources.

A distinction is made between the different cold-rolled strips, depending on their properties, into grain-oriented and non-grain-oriented materials. TEPROSA manufactures laser-cut sheet metal lamellae as well as finished sheet metal packages for prototypes and small series.

Laser cutting is an economical and technically outstanding process for cutting electrical steel quickly and precisely. The precise laser beam guidance, the high power density and a high cutting speed enable high-precision 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. However, there is another special feature when processing electrical sheets with a laser: in contrast to alternative cutting methods such as stamping, laser cutting only causes very minor structural changes on the cutting edges.

Your supplier for electrical steel lamellae

TEPROSA GmbH has specialized in the production of sophisticated, custom-fit laser parts of exceptionally high quality. In the field of electrical steel, we manufacture individual laminations and sheets for stators and rotors, as well as entire laminated cores (stator or rotor cores) from different types of steel. 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 guarantee consistent quality and complete traceability of each individual production step.

Why use electrical steel?

Electrical steel is used to make magnetic cores for electric motors. Solid cores convert most of the power into heat instead of transferring it. This is due to eddy currents that arise within the solid cores. They are therefore not suitable for use in electrical machines. Only the laminated structure of the magnetic cores made of individual electrical steel laminations isolated from one another makes it possible to largely prevent eddy currents and thus ensure efficient energy transmission in the electric motor.

The electrical sheet metal, from which both the stator and the rotor are made, plays a key role in this energy transmission due to its special physical properties.

What is non-oriented electrical steel?

Electrical sheet consists of an iron-silicon alloy and is basically classified into two types: as non-grain-oriented or isotropic and as grain-oriented or anisotropic electrical steel. Non-grain-oriented electrical steel is characterized by largely uniform magnetic properties.

The iron unit cells of non-oriented electrical steel are not ordered. Because of this isotropy, the magnetic properties are almost independent of the direction of magnetization. Non-grain-oriented electrical steel is used to manufacture stators and rotors in industrial motors, wind turbines and household appliances.

When laser cutting electrical steel laminations from non-grain-oriented electrical steel, care must be taken to ensure that the heat-affected zone and the associated deterioration in magnetic properties are as small as possible.

What is grain oriented electrical steel?

In contrast to isotropic or non-grain-oriented electrical steel, anisotropic or grain-oriented electrical steel only has excellent magnetic properties in one direction. In a complex metallurgical process, the iron unit cells are aligned in such a way that they achieve a uniform orientation (texture).

These properties are optimal for transformers in which the individual legs can be manufactured in the most favorable magnetic direction. Grain-oriented electrical steel is therefore mainly used for the production of power and distribution transformers.

The surface of particularly low-loss grades of grain-oriented electrical steel is treated with a laser. This process, known as “laser scribing”, leads to the refinement of magnetic domains and thus to the improvement of the magnetization process.

When laser cutting grain-oriented electrical steel, microscopic metal spatter or slag must also be prevented from remaining on the sheet surface. This could damage the insulating coating and increase eddy current losses.”

What is bonding varnish?

Bonding varnish is a special connection technology for laminated cores. After the individual laminations have been cut, electrical steel with a bonding varnish coating is baked into a laminated core in a temperature step. The result is a flat, solid connection between the individual sheets with complete insulation. Laminated cores manufactured in this way have high precision and perfect magnetic properties.

Advantages of the bonding varnish technology

Precision – Sheets coated with bonding varnish are baked over the entire surface. In
this way, even filigree lamellas can be precisely assembled.
Designfreedom – Bonding varnish enables an optimal design of the lamellas, since no
stacking nubs or weld seams have to be taken into account.
Isolation – There are no short circuits when packaging with bonding varnish.
Magnetic characteristics – In no other process the magnetic properties of the electrical steel
remain as unaffected as in the baking varnish process.
Connection – The full-surface connection of the lamellas reduces vibrations.
Thermal conductivity – Laminated cores with bonding varnish coating have improved thermal
conductivity.
Stability – Thanks to the full-surface connection, bonding varnish packages are
very stable and robust.”

Other coating systems

Various coatings are applied to the strip to prevent short circuits between the laminations in electrical
laminated cores and thereby reduce eddy currents. The layer thicknesses vary from 1 to 4 μm. There are
different coating systems to influence the properties of electrical steel. Here you will find a selection:

Coating C3 Coating to improve the lubricating effect.
Coating C4 Coating to improve corrosion protection and insulation resistance.
Coating C5 Coating to optimize temperature resistance. Relevant e.g. for stress relief
annealing after the stamping process.
Coating C6 Coating for a particularly high insulation resistance.

Our laser technology

For laser cutting, we use the latest fiber lasers from various manufacturers, which enable contour accuracies of ± 0.01 mm. Fiber lasers offer excellent beam quality, deliver low thermal input and thus enable high-precision laser cuts with little distortion and clean, almost burr-free cut edges.

Laser cutting electrical sheets