Rectifier transformers are key devices in power electronic systems, primarily converting alternating current (AC) to direct current (DC). They are widely used in electrolytic aluminum, rail transportation, charging stations, and electrochemical processing. As the core material for rectifier transformer windings, the selection of aluminum foil directly affects the efficiency, stability, and service life of the rectifier system.
I. Operating Characteristics of Rectifier Transformers and Aluminum Foil Requirements
1.1 Operating Characteristics
Load Characteristics: Non-sinusoidal load current waveform with harmonic components
Current Stress: High RMS current values from large DC output
Harmonic Losses: Additional copper and iron losses from harmonic currents
Voltage Ripple: DC-side voltage ripple affects insulation design
1.2 Core Considerations for Aluminum Foil Selection
Technical Points
Requirements
Conductivity
IACS ≥59%, low resistivity
Thickness Accuracy
Tolerance within ±3%
Thermal Class
120-180°C operating temperature
Mechanical Strength
Elongation ≥15%
Surface Treatment
Oil/varnish corrosion resistance
II. Technical Specifications of Aluminum Foil Materials
2.1 Recommended Grades
Grade
Purity
Conductivity
Tensile Strength
Elongation
1060
≥99.60%
≥35% IACS
70-110 MPa
≥15%
1070
≥99.70%
≥36% IACS
65-100 MPa
≥20%
3003
Al-Mn alloy
≥30% IACS
130-180 MPa
≥8%
2.2 Key Performance Parameters
Resistivity: ≤0.028 Ω·mm²/m (20°C)
Thickness Range: 0.5-3.0mm (0.8-2.5mm common)
Thickness Tolerance: ±0.02mm (high precision)
Max Operating Temp: 180°C (short-term)
III. Industry Standards
Standard
Description
IEC 60325
Aluminum Foil for Transformers
GB/T 8544
Electrical Aluminum Foil
ASTM B373
Transformer Aluminum Foil Spec
JIS H4160
Aluminum Alloy Foil
IV. Special Process Matching
4.1 Harmonic Loss Control
Prioritize 1070 high-purity aluminum for low impurity content
Control thickness to suppress eddy current losses
Width typically 10-20x thickness (skin effect consideration)
4.2 Winding Process Adaptation
Winding Type
Condition
Elongation
Cylindrical
O/H22
≥15%
Foil Winding
O
≥20%
High Voltage
H24/H26
≥12%
V. Quality Inspection
Inspection
Method
Standard
Chemical Composition
Spectroscopy
Grade compliant
Thickness Tolerance
Thickness gauge
±0.02mm
Surface Quality
Visual
No defects
Resistivity
Four-probe
≤0.028 Ω·mm²/m
VI. Supplier Selection
ISO 9001/14001/45001 certified
Complete production line
Third-party testing (SGS/BV)
Monthly capacity ≥300 tons
VII. Product Specifications
Grade
Thickness
Width
Temper
Conductivity
1060
0.5-2.5mm
20-500mm
O/H22/H24
≥35% IACS
1070
0.5-3.0mm
20-600mm
O/H22/H24
≥36% IACS
3003
0.8-2.0mm
20-400mm
H24/H26
≥30% IACS
Conclusion
The selection of aluminum foil for rectifiers requires comprehensive consideration of load characteristics, harmonic environment, heat dissipation conditions, and cost-effectiveness.
Our company has 30 years of experience exporting electrical wire and metal foil. We provide 1060/1070/3003 series aluminum foil for rectifiers with customized sizes and global sample shipping.
The technical parameters described are general reference values. Please consult our technical team for specific selections based on your rectifier design requirements.
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