Tengye provides professional customization services for silicon steel laminations. To facilitate communication with customers, this article outlines the process of customizing Tengye’s silicon steel laminations, hoping to assist potential clients.
The data involved in this article is based on non-oriented electrical steel 10SWH950.
Production Process of Tengye Silicon Steel Laminations
Communication and Design
Tengye communicates with the customer to clarify the specific application, performance requirements, size specifications, quantity, and other needs for the silicon steel laminations.
Dimension Properties
| Longitudinal Thickness Deviation（mm） | Transverse Thickness Deviation（mm） | ||
| Guarantee Value | Typical Value | Guarantee Value | Typical Value |
| ≤0.004 | 0.001 | ≤0.005 | 0.002 |
| Width deviation（mm） | Wave factor (%) | ||
| Guarantee value | Typical value | Guarantee value | Typical value |
| ≤1.5 | 0.5 | ≤1.5 | 0.8 |
Then, based on the customer’s drawings, Tengye determines the relevant information or designs the core according to customer requirements. This includes specifying the exact shape of the laminations, stacking methods, insulation requirements, and other technical parameters, and producing detailed design drawings.
Material Procurement
After fully understanding the customer’s requirements, Tengye procures silicon steel materials that meet the specifications, including thickness, width, and magnetic properties. Tengye conducts quality inspections on the procured silicon steel sheets to ensure the materials are defect-free, have a smooth surface, and possess stable magnetic properties.
Magnetic Properties
| Grade | Thickness（mm） | Density（kg/dm3） |
| 10SWH950 | 0.1 | 7.65 |
| Iron loss P1.0/400 (W/kg) | Magnetic Polarization J50(T) | ||
| Guarantee value | Typical value | Guarantee value | Typical value |
| ≤9.5 | 9.1 | ≥1.67 | 1.69 |
Stamping or Shearing
Using stamping or shearing equipment, the silicon steel sheets are stamped or sheared into the required lamination shapes according to the design drawings. During this process, Tengye controls the precision and parameters of the equipment to ensure the dimensional accuracy and edge quality of the laminations, avoiding problems like burrs or deformation. The laminations undergo a flattening process to ensure a smooth surface, improving the stacking factor and the magnetic performance of the core.
Stacking factor ≥ 94%
Note: The stacking factor is tested according to the standard GB/T 19289. Standards are negotiable.
Insulation Treatment
Tengye applies an insulating coating or attaches insulating materials such as insulating paint, insulating paper, or insulating films on the surface of the laminations to prevent short circuits between layers and reduce eddy current losses. The insulation treatment must ensure that the coating or insulating materials are uniform, complete, with no missed areas, and that the insulation performance meets design requirements.
Coating Properties
| Coating Type | M1 | M4 | M3/M7 |
| Composition | Semi-organic (Cr Free) | Semi-organic | organic |
| Type | C5 | C5 | C3 |
| Coating Thickness | 0.4~1.0μm | 0.4~1.0μm | 2.0~6.0μm |
| Interlamination Resistance | ≥3Ω·cm²/laminatio n | ≥3Ω·cm²/laminatio n | ≥10Ω·cm²/laminatio on |
| Adhesiveness | Excellent | Excellent | Excellent |
| bonding strength, roller peel test | 4N/mm ±2 | ||
| bonding strength, shear test | 20N/mm2±5 |
Notes：
The interlamination resistance and adhesiveness are both tested according to the standard
GB/T 2522. Standards are negotiable.
M3 and M7 are self-bonding coatings. The shelf life of M3 and M7 coatings is 6 months,
and the recommended storage conditions are temperatures below 35 ℃, avoiding direct
sunlight.
The recommended curing process for M3 is 240℃, 3mpa, and 3min; The recommended
curing process for M7 is 250℃, 2mpa, and 5min。
The rolling peel strength is tested according to the standard DIN EN 1464. The shear
Strength test was performed according to the standard DIN EN 1465.
Stacking
According to the design requirements for stacking methods and order, Tengye stacks the insulated laminations together to form the core. During the stacking process, care must be taken with the order, direction, and gaps between the laminations to ensure tight and orderly assembly, avoiding misalignment or missing laminations.
The assembled core is then shaped to adjust its size and shape to meet design specifications. A clamping device or bolts are used to secure the core, ensuring it remains stable during use and does not loosen due to vibration or magnetic field effects.
Mechanical Properties
| Yield strength (MPa) | Tensile strength (MPa) | ||
| Guarantee value | Typical value | Guarantee value | Typical value |
| ≥340 | 360 | ≥430 | 450 |
| Elongation (%) | Hardness (HV) | |
| Guarantee value | Typical value | Typical value |
| ≥10 | 15 | 180 |
Quality Inspection
Comprehensive quality inspections are conducted on the custom-produced silicon steel lamination cores, including checks on dimensional accuracy, stacking coefficient, insulation performance, magnetic properties, and appearance quality. Only qualified cores can proceed to the next process or be delivered to customers; unqualified cores must be reworked or discarded.
Product related information: Material = 10SWH950, Lamination method = Adhesive
| Inspection Item | Dimensions & Tolerance | Sample A | Sample B | Sample C |
| Outer Diameter (OD) | 80 +0.03 | -0.02 | -0.01 | -0.01 |
| Inner Diameter (ID) | 52.6 +0.05 | -0.01 | -0.02 | -0.02 |
| Height | 60 +0.25 | 0.15 | 0.22 | 0.15 |
| Number of Laminations | ≥582 | 595 | 595 | 596 |
| Stacking Factor | ≥0.97 | 0.989 | 0.988 | 0.991 |
| Concentricity | ≤0.05 | ≤0.02 | ≤0.02 | ≤0.02 |
| Circularity (Roundness) | ≤0.08 | ≤0.03 | ≤0.03 | ≤0.03 |
| Result Judgment: | OK | OK | OK |
Packaging and Delivery
The qualified silicon steel lamination cores are packaged using appropriate materials and methods to prevent damage during transportation and storage. Additionally, relevant technical documents and quality certification papers are provided.
Magnets Manufacturer
At Tengye, we’re thrilled to be early participants in your new projects. Our passion for magnets extends from material selection and design optimization to providing magnetic solutions. We hope to bring our knowledge and experience to the forefront by actively engaging in your upcoming projects. Work with our magnet experts to get the right magnet solution.
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