Sensor, Transformer & Resistance Coils

Precision Bobbin Coils — Custom OEM/ODM Manufacturing

Custom sensor, transformer and precision resistance coils from WIRESUN — layer or non-inductive bifilar winding to your drawing. OEM/ODM, samples & quotes.

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

Sensor, Transformer & Resistance Coils are precision-wound electromagnetic components used in inductive sensors, position and displacement measurement, current and signal transformers, precision resistors, and measuring instruments. WIRESUN manufactures these coils according to customer drawings, samples, or electrical specifications, supporting different wire materials, coil shapes, winding structures, turns ratios, resistance and inductance values, and insulation grades.

Built with CNC precision winding equipment and controlled production processes, each coil is wound by the method its function requires: layer winding for sensor and transformer coils, and non-inductive bifilar winding for precision resistance coils. These coils are suitable for industrial automation, instrumentation, power and energy equipment, and electronic control systems. 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

Item	Specification
Product Name	Sensor, Transformer & Resistance Coils
Coil Type	Sensor coil / Sensing coil / Transformer coil and winding / Precision resistance coil / Inductor
Application	Inductive and proximity sensors, position and displacement measurement (LVDT), current and voltage transformers, signal transformers, precision resistors, shunts, measuring instruments
Wire Material	Enameled copper wire, self-bonding wire, Litz wire, manganin / constantan / nichrome resistance wire, or custom specified material
Wire Diameter	Customizable according to drawing or sample
Coil Shape	Round, rectangular, bobbin, air core, toroidal, or custom geometry
Winding Turns / Turns Ratio	Customizable; turns ratio built to specification for transformer coils
Resistance	Customized to customer specification
Inductance	Customized to customer specification
Dimension Tolerance	Customizable based on project requirements
Winding Method	Precision CNC winding with controlled wire tension; layer or random winding for sensor and transformer coils, non-inductive bifilar winding for resistance coils
Insulation Requirement	Customized according to voltage, temperature, and operating environment; Class B / F / H insulation available
Reliability Requirement	Stable electrical performance, high consistency, and batch-level process control
Quality Control	Appearance inspection, dimension check, resistance test, inductance test, turns ratio test, continuity and hipot test, and batch inspection
Production Type	OEM / ODM / drawing-based custom manufacturing
Sample Support	Available

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.