Packaging of laminated cores for stators and rotors

We produce rotor cores as individual cores or as shaft, main or commutating poles, stator insertion cores, or baked cores. They can be coated and delivered as loose parts or sealed into the housing. In addition, we offer a range of packaging processes:

direct layering

It is possible to layer the sheets in a layer cage or directly in the housing. The layer cage is used as an aid and is adapted to the outer contour of the sheet. It is pressed to shape under a press and fixated accordingly (e.g. by welding or clamping).

using a layer mandrel

Another option is to lay the sheets on a layer mandrel, pressing to shape after the corresponding number of sheets.

Segments layering

If we are dealing with a machine whose laminated core outer diameter is larger than 1250 mm, segments are used. These segments can be layered in a layer cage, a housing or on a layer mandrel or shaft. The core layered in the cage is later pulled into the housing completely.

free layering

Here, the core is layered using aids and then later fi xated without the use of a housing, mandrel or cage. Aids for layering the core are, for example, layer strips or needles. These are ground to achieve dimensional accuracy. Depending on the laminated core length, intermediate press operations are performed. This ensures that the dimensional accuracy is maintained across the entire circumference of the laminated core.

In shrinking processes used for the assembly of laminated cores in housings or on shafts, the components to be joined are measured at room temperature and aligned vertically. After the uniform heating or cooling (shafts) of the corresponding components, these are subjected to the joining process and accurately aligned with one another.

Laminated cores made of whole sheets or segments with or without pressure plates

We develop individual solutions for the repair of laminated cores and provide assistance in the production of prototypes. With the support from our welding engineering staff and 3D measurement of large cores by our quality assurance, large and complex projects can be handled.

  • Max. core size: L x Ø: 2500 mm x 2500 mm
  • Max. weight: 40 t
  • Max. pressing force: 6000 kN
  • Max. housing size: Ø 5500 mm x 2000 mm

Larger dimensions and weights may be possible upon technical inspection.

Welding procedures

The following welding procedures are used in laminated core production, new manufacture and repair of components for rail vehicles:

  • Metal active gas welding (MAG; 135)
  • Tungsten inert gas welding (TIG; 141)
  • Manual metal arc welding (E; 111)
  • Resistance spot welding (21)

Materials of the groups 1.1, 1.2 and 8 are processed.

The PARTZSCH Group is certified according to DIN 18800-7:2008-11 Class D for welding of steel structures with predominately static loads and is suitable for performing welding work for the scope Certification Level CL1 according to EN 15085-2 .

The final weld inspection is performed using the following procedures from our certified personnel:

  • Magnetic particle testin
  • Dye penetration method
  • Visual welding seam inspection
Technical parameters for welding procedures

For welding work, machines from Rehm-Schweißtechnik are used, which provide optimal results.

Inert gas MAG/MIG

  • Max. output 400 A
  • Max. wire diameter 1.6 mm

Inert gas TIG

  • Output 160-400 A

Resistance spot welding

  • Nominal power 40 KVA
  • max. welding power 118 KVA
  • Max. short-circuit current 26.2 kA

Welding certifications

The PARTZSCH Group is certified according to DIN 18800-7:2008-11 Class D for welding of steel structures with predominately static loads and is suitable for performing welding work for the scope Certification Level CL1 according to EN 15085-2.

For more information, please see Certifications.