CD-Core for Transformer: Comprehensive Industry Guide
Product Overview
CD-Core, also known as CD-type magnetic core for transformer, is a high-performance magnetic component made from high-grade oriented silicon steel strip, widely used in transformers, inductors, and power supply systems. It is formed by combining two U-shaped half-cores, featuring adjustable air gaps, low core loss, and high magnetic permeability. The unique "CD" design offers excellent magnetic circuit performance, making it ideal for audio transformers, power inductors, and high-frequency applications.
Technical Parameters (From Product Brochure)
| Core Model | Dimensions (mm) | Output Power (VA) | Core Weight (kg) |
|---|---|---|---|
| a × b × c × h | 50Hz / 400Hz | ||
| CD6.5×12.5×8 | 6.5×12.5×8×8 | -- / 9.69 | 0.032 |
| CD6.5×12.5×10 | 6.5×12.5×8×10 | -- / 12.60 | 0.035 |
| CD6.5×12.5×12 | 6.5×12.5×8×12 | -- / 16.60 | 0.038 |
| CD6.5×12.5×16 | 6.5×12.5×8×16 | -- / 20.40 | 0.042 |
| CD8×12.5×16 | 8×12.5×10×16 | -- / 25.80 | 0.053 |
| CD8×12.5×20 | 8×12.5×10×20 | -- / 33.30 | 0.080 |
| CD8×12.5×25 | 8×12.5×10×25 | -- / 42.00 | 0.072 |
| CD8×12.5×20 | 8×12.5×10×20 | -- / 51.40 | 0.072 |
| CD10×12.5×12.5 | 10×12.5×12.5×12.5 | 2.42 / 56.60 | 0.095 |
| CD10×12.5×25 | 10×12.5×12.5×25 | 3.40 / 71.00 | 0.110 |
| CD10×12.5×32 | 10×12.5×12.5×32 | 4.90 / 91.20 | 0.130 |
| CD10×12.5×40 | 10×12.5×12.5×40 | 6.67 / 112.00 | 0.140 |
| CD12.5×16×25 | 12.5×16×16×25 | 10.70 / 119.00 | 0.200 |
| CD12.5×16×32 | 12.5×16×16×32 | 14.70 / 148.00 | 0.230 |
| CD12.5×16×40 | 12.5×16×16×40 | 19.60 / 181.00 | 0.240 |
| CD12.5×16×50 | 12.5×16×16×50 | 25.00 / 221.00 | 0.270 |
| CD12.5×25×30 | 12.5×20×25×30 | 31.20 / 222.00 | 0.340 |
| CD12.5×25×40 | 12.5×20×25×40 | 43.90 / 268.00 | 0.400 |
| CD12.5×25×50 | 12.5×20×25×50 | 54.00 / 344.00 | 0.440 |
| CD12.5×25×60 | 12.5×20×25×60 | 63.20 / 398.00 | 0.500 |
| CD16×32×40 | 16×32×25×40 | -- / 89.00 | 0.720 |
| CD16×32×50 | 16×32×25×50 | -- / 111.00 | 0.800 |
| CD16×32×65 | 16×32×25×65 | -- / 143.00 | 0.920 |
| CD16×32×80 | 16×32×25×80 | -- / 171.00 | 1.100 |
| CD20×40×50 | 20×40×32×50 | -- / 199.00 | 1.420 |
| CD20×40×60 | 20×40×32×60 | -- / 231.00 | 1.550 |
| CD20×40×80 | 20×40×32×80 | -- / 306.00 | 1.780 |
| CD20×40×100 | 20×40×32×100 | -- / 375.00 | 2.050 |
| CD25×50×65 | 25×50×40×65 | -- / 448.00 | 2.800 |
| CD25×50×80 | 25×50×40×80 | -- / 540.00 | 3.100 |
| CD25×50×100 | 25×50×40×100 | -- / 659.00 | 2.950 |
| CD25×50×120 | 25×50×40×120 | -- / 776.00 | 3.900 |
| CD32×64×80 | 32×64×50×80 | -- / 1006.00 | 5.800 |
| CD32×64×100 | 32×64×50×100 | -- / 1318.00 | 6.350 |
| CD32×64×130 | 32×64×50×130 | -- / 1517.00 | 7.300 |
| CD32×64×160 | 32×64×50×160 | -- / 1943.00 | 8.250 |
| CD40×80×100 | 40×80×64×100 | -- / 2106.00 | 11.300 |
| CD40×80×120 | 40×80×64×120 | -- / 2521.00 | 12.300 |
| CD40×80×160 | 40×80×64×160 | -- / 3214.00 | 14.500 |
| CD40×80×200 | 40×80×64×200 | -- / 3912.00 | 16.500 |
Production Process of Weshare CD-Core
Raw Material Selection: High-grade oriented silicon steel strips with low core loss (typically 0.23-0.35mm thickness) are selected for optimal magnetic performance.
Slitting & Cutting: The steel strip is precision-slit to the required width, then cut into lengths for forming.
Winding & Forming: The cut strip is tightly wound into U-shaped half-cores using specialized winding machines, ensuring uniform stacking and minimal air gaps.
Annealing: The wound cores undergo high-temperature annealing (in a nitrogen atmosphere) to relieve internal stress and improve magnetic permeability.
Insulation & Coating: The annealed cores are coated with a high-temperature insulating varnish to prevent inter-lamination short circuits and enhance corrosion resistance.
Assembly & Testing: Two U-shaped cores are paired, aligned, and tested for magnetic performance (inductance, loss, saturation) to ensure compliance with specifications.
Final Inspection: Visual and dimensional checks, plus electrical performance verification, before packaging.
Packaging & Transportation
Packaging
Inner Protection: Each core is individually wrapped in anti-static bubble wrap or foam to prevent scratches and impact damage.
Outer Carton: Cores are packed in sturdy corrugated cardboard boxes with dividers, labeled with product model, quantity, and specifications.
Moisture Protection: Desiccant packets are included to absorb moisture during transit, especially for sea freight.
Customization: OEM/ODM packaging with customer logos and barcodes is available upon request.
Transportation
Shipping Methods:
Air Freight: For urgent orders, suitable for small/medium-sized cores.
Sea Freight: Cost-effective for bulk shipments, with lead times of 20-45 days depending on destination.
Courier (DHL/FedEx): For sample orders or small batches, door-to-door delivery.
Handling Notes:
Avoid dropping or stacking heavy loads on the packages.
Store in a dry, temperature-controlled environment to prevent oxidation.
Keep away from strong magnetic fields to avoid demagnetization.
Advantages & Disadvantages of CD-Core For Transformer
✅ Advantages
Low Core Loss: Oriented silicon steel material ensures minimal energy loss, improving transformer efficiency.
Adjustable Air Gap: The split design allows precise adjustment of air gaps, reducing magnetic saturation and improving inductance stability.
High Magnetic Permeability: Excellent permeability leads to smaller core sizes for the same power rating, saving space.
Easy Assembly: Modular U-shaped halves simplify winding and assembly, reducing production time.
Versatile Applications: Suitable for audio transformers, power inductors, UPS systems, and high-frequency applications.
❌ Disadvantages
Higher Cost: Oriented silicon steel and precision manufacturing make CD-cores more expensive than traditional EI-cores.
Sensitive to Air Gaps: Improper alignment of the two halves can introduce additional air gaps, degrading performance.
Mechanical Fragility: The thin laminations are prone to damage if not handled carefully during assembly.
FAQ (Frequently Asked Questions)
Q1: What is the main application of CD-Core?
A: CD-cores are primarily used in audio transformers (for high-fidelity equipment), power inductors, UPS systems, and high-frequency power supplies. They are also ideal for choke coils and isolation transformers.
Q2: How to choose the right CD-Core model?
A: Selection depends on the required power rating (VA), operating frequency (50Hz/400Hz), and dimensions. Refer to our technical parameter table for core weight, output power, and dimensions, or contact our engineering team for custom recommendations.
Q3: Can CD-Core be customized?
A: Yes! Weshare offers custom CD-cores with specific dimensions, air gaps, and coating materials to meet unique application requirements.
Q4: What is the typical lead time for production?
A: Standard models have a lead time of 2-3 weeks, while custom orders take 4-6 weeks, depending on complexity and quantity.
Q5: How to ensure the quality of CD-Core?
A: All Weshare CD-cores undergo rigorous testing, including core loss measurement, inductance verification, and visual inspection. We provide test reports with each shipment for traceability.
Industry Applications
CD-cores are widely used across industries:
Audio & Entertainment: High-fidelity audio transformers, guitar amplifiers, and professional audio equipment.
Industrial Power: UPS systems, inverters, and power supply units for industrial machinery.
Telecommunications: Inductors and transformers for base stations and network equipment.
Medical Equipment: Power transformers for medical devices requiring low noise and high efficiency.
About Weshare
Hangzhou Weshare Imp. & Exp. Co., Ltd. is a leading supplier of high-quality magnetic cores and transformer components. Our CD-cores are manufactured to strict quality standards, ensuring reliable performance for global customers. We offer OEM/ODM services, competitive pricing, and comprehensive after-sales support.