CT&PT Core

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Silicon Steel Rectangular Core - Low Loss - High Power Density - Transformer core (1).jpg

Silicon Steel Rectangular Core - Low Loss - High Power Density - Transformer core (1).png

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Silicon Steel Rectangular Core - Low Loss - High Power Density - Transformer core

Silicon Steel Rectangular Core - Precision-Laminated Magnetic Component for Low-Frequency Power Applications

Rectangular core is a subclass of silicon steel laminated cores, formed by stacking insulated silicon steel sheets into a rectangular geometry. Unlike toroidal cores, its straight-edge structure simplifies winding and assembly for linear transformers, inductors, and motors. The core’s silicon content (0.5%-4.5%) and lamination thickness (0.18-0.5mm) are optimized to balance magnetic permeability and eddy-current loss, making it a staple in low-frequency (50-400Hz) power systems.

Structural Advantages for Winding

Rectangular geometry allows direct winding of copper coils on linear limbs, reducing manufacturing complexity compared to toroidal cores. Step-lap stacking minimizes air gaps at corner joints, ensuring continuous magnetic flux path and reducing excitation losses.

Low Core Loss Profile

At 50Hz/1.5T, core loss ranges from 0.6-3.5W/kg (depending on lamination thickness), ideal for grid-frequency transformers. Insulated laminations (0.23mm thickness example) reduce eddy-current loss by 90% versus solid iron cores.

High Thermal Conductivity

The stacked structure facilitates heat dissipation through metallic contact between laminations, supporting continuous high-power operation without overheating.

Customizable Dimensions

Core size (width, height, depth) can be tailored to application requirements, from small distribution transformers (100kVA) to large power transformers (100MVA+).

Common Applications

Power Transformers

Distribution Transformers: Used in urban grids (10-33kV) to step down voltage, featuring low noise (<45dB) and compliance with IEC 60076 standards.

Industrial Transformers: Supports high-power applications (e.g., steel mills, petrochemical plants) with short-circuit resistance and overload capability.

Electric Motors & Generators

Induction Motors: Rectangular cores in stator/rotor assemblies improve energy efficiency (IE4-rated motors achieve >96% efficiency). Alternators: Used in diesel generators for backup power systems, ensuring stable voltage regulation under sudden load changes.

Specialized Electrical Equipment

Welding Transformers: High saturation flux density (1.8T) enables compact designs for arc welding machines. Magnetic Separators: Used in mining and recycling to create strong magnetic fields for particle separation.