Special-Shaped Coils — Engineered to Your Exact Drawing

From toroidal coils and flat windings to multi-strand and non-standard coil geometries, WIRESUN provides DFM support, rapid prototyping and scalable OEM/ODM production based on your drawings or samples.

Air Core Coils12Bobbin Coils22Special-Shaped Coils3Machines & Accessories23
Rectangular and Custom-Shaped Air Core Coils

Rectangular and Custom-Shaped Air Core Coils

Special-Shaped Coils — Engineered to Your Exact Drawing

Custom rectangular and special-shaped air core coils manufactured in racetrack, rectangular, triangular, and other bobbinless geometries, featuring stable dimensions, consistent electrical performance, and OEM/ODM customization based on drawings or samples.
Winding MaterialCopper / Enameled / Litz / Aluminum / Flat / Self-bonding / etc
Winding Precision± 0.01mm
Winding TurnsCustomizable (1T – 10,000T)
Minimum Order QtyCustomizable
Lead Time7–15 business days
Payment TermsT/T, L/C, Western Union
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Typically responds within 24 hours · Free samples available

30+ Years Experience
ISO Certified Factory
Shipped to 30+ Countries

Rectangular and Custom-Shaped Air Core Coils are precision-wound bobbinless coils designed for applications that require non-standard coil geometry, compact assembly space, and stable electromagnetic performance. Compared with standard round coils, rectangular, racetrack, triangular, and other special-shaped designs can better match limited installation areas and customized magnetic field requirements.


WIRESUN manufactures these coils according to customer drawings, samples, or electrical specifications. Coil shape, outer dimensions, inner opening, wire diameter, winding turns, resistance, inductance, lead wire position, and insulation requirements can all be customized. These coils are suitable for sensors, RFID modules, wireless charging, communication devices, magnetic components, medical devices, precision instruments, and custom electronic assemblies. Prototype development, sample validation, and mass production are available for OEM/ODM projects.

Applications

Smartphones & 3C Electronics
Automotive Electronics
Industrial Sensors
Precision Instruments
Audio Equipment
Wireless Charging
ItemSpecification
Product NameRectangular and Custom-Shaped Air Core Coils
Coil TypeRectangular air core coil / Racetrack coil / Bobbinless coil / Custom-shaped coil
ApplicationSensors, RFID modules, wireless charging, communication devices, magnetic components, medical devices, precision instruments, custom electronic assemblies
Wire MaterialEnameled copper wire, self-bonding wire, Litz wire, or custom specified material
Wire DiameterCustomizable according to drawing or sample
Coil ShapeRectangular, racetrack, triangular, oval, square, or custom geometry
Outer DimensionsCustomizable
Inner OpeningCustomizable
Lead Wire PositionCustomizable according to assembly requirements
Winding TurnsCustomizable
ResistanceCustomized to customer specification
InductanceCustomized to customer specification
Dimension ToleranceCustomizable based on project requirements
Winding MethodPrecision CNC winding / self-bonding forming with controlled wire tension
Quality ControlAppearance inspection, dimension check, resistance test, inductance test, continuity test, and batch inspection
Production TypeOEM / ODM / drawing-based custom manufacturing
Sample SupportAvailable
Our standard MOQ is 500 pcs for most coil types. For first-time customers or prototype evaluation, we accept small trial orders of 10-50 pcs. MOQ may vary by product complexity. Contact us for a specific quote.
Yes. Samples are available within 5-7 business days after engineering confirmation. A nominal sample fee applies, which is credited toward your first mass production order.
You can email drawings such as PDF, DWG, or STEP files, or fill out our inquiry form. If you do not have drawings, a written description or physical sample is also acceptable.
We can wind wire as fine as 0.01mm using Zongheng CNC precision winding machines with automated tension control.
Yes. Our special-shaped coil series handles non-circular and irregular geometries. Submit your drawings and our engineering team will assess feasibility.
Standard options include bare copper wire, enameled copper wire, and Litz wire. Custom alloy or coated wire options are available on request.
Yes. Provide your target inductance, frequency, and DC resistance requirements, and we will calculate and wind to specification.
WIRESUN is ISO 9001 certified. Products can ship with test reports and COA. Third-party inspection can be arranged upon request.
All coils are wound on CNC machines with precision control. Each production batch undergoes electrical testing, including inductance, DCR, and impedance checks.
Standard documentation includes packing list, commercial invoice, Certificate of Analysis, and electrical test report. RoHS/REACH documents are available upon request.
We ship worldwide. Regular destinations include Southeast Asia, Europe, the Americas, the Middle East, and Russia. Express and sea freight options are available.
Standard terms are 30% T/T deposit upon order confirmation and 70% balance before shipment. L/C is accepted for larger orders, and Western Union is available for sample fees.
Standard products usually take 15-20 business days. Complex custom coils generally take 20-30 business days. Final lead time is confirmed at quotation stage.
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