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I. Basic Concept of Thermal Conductivity of Silicon Steel Sheets

Thermal conductivity of kiselstål sheets refers to their capacity to transfer heat per unit time, normally measured in W/(m·K). As a type of electrical steel, its thermal conductivity is affected by silicon content, grain orientation, manufacturing processes and other factors. In general, the thermal conductivity of kiselstål sheets ranges from 15 to 40 W/(m·K), and the exact value depends on the specific chemical composition and treatment of the material.

II. Key Factors Influencing Thermal Conductivity

• Silicon content: Rising silicon content reduces thermal conductivity but optimizes electromagnetic properties.
• Grain orientation: Non-oriented kiselstål exhibits isotropic thermal conductivity, while grain-oriented silicon steel shows directional differences in heat conduction.
• Thickness: Thinner silicon steel sheets dissipate heat faster locally yet introduce higher overall thermal resistance.
• Surface treatment: Insulating coatings slightly degrade heat transfer efficiency.

III. Practical Considerations of Thermal Conductivity in Motor Design

During the design of motors and transformers, the thermal conductivity of silicon steel sheets directly governs equipment temperature rise and heat dissipation performance. Engineers must strike a balance between electromagnetic performance and heat conduction requirements when selecting appropriate silicon steel grades. Although high-silicon silicon steel delivers low electromagnetic loss, its relatively low thermal conductivity may necessitate additional heat dissipation structures.