COIL WINDING & ASSEMBLY
Custom Coil Manufacturer for OEMs
JHCOILS manufactures round-wire and flat-wire inductor coils, RFID antenna coils and wireless charging coils in Dongguan, China. Send a drawing or key specs for a sample or production quote.
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INDUCTOR WINDING
Round-Wire and Flat-Wire Inductor Coils
Choose the conductor profile for your design. Specify round wire by diameter or flat wire by width and thickness.
Round-Wire Inductor Coils
Round enameled copper windings built to your specified turns, dimensions and lead shape. Share the wire diameter, target inductance and DC resistance.
Flat-Wire Inductor Coils
Rectangular copper windings for power inductors. Share the conductor width and thickness, available winding space, target current and DC resistance.
PRODUCTS
Explore Our Custom Coil Range
Choose a coil family to see construction options and application examples.
Wireless Charging Coils
Transmitter and receiver coils built around your winding geometry, available space, lead routing and shielding requirements.
Antenna and RFID Coils
Antenna windings for RFID and other near-field designs. Define the frequency, inductance, geometry and circuit connection.
Air-Core and Self-Supported Coils
Self-bonded windings that hold their shape without a bobbin, in round, rectangular and custom geometries.
Bobbin Wound Coils
Windings built on a specified bobbin, with mounting, insulation, pinout and terminations matched to your assembly.
Magnetic Coils and Assemblies
Wound components with iron or magnetic cores and terminal leads, built to the agreed mechanical and electrical requirements.
Linear Motor Coils
Shaped coils and assemblies for linear motors. Review winding height, clearances and lead exits before sampling.
APPLICATIONS
Find a Coil by Application
Start with what the coil needs to do in your device.
Wireless Power
Review the transmitter or receiver envelope, ferrite, alignment and operating gap early.
RFID and Access Control
Define frequency, target inductance, antenna geometry and the way the coil connects to the circuit.
Linear Motion
Specify coil shape, height, thermal conditions and clearances for the motor assembly.
Audio and Voice Coils
Set the winding diameter, former, lead routing and resistance for the speaker or actuator design.
Electromagnetic Actuation
Review the bobbin or core, winding space, lead connection and electrical targets for the assembly.
Power Electronics
Select the conductor and winding construction around inductance, resistance and available space.
MANUFACTURING CAPABILITIES
Coil Winding, Assembly and Testing
Agree on what goes into the coil and how it will be checked.
Winding Design Review
Review the coil envelope, wire and insulation, winding geometry and electrical targets against your drawing.
Tooling and Winding
Plan tooling and the winding setup for round magnet wire, flat copper wire or Litz wire, depending on the design.
Termination and Assembly
Specify lead lengths, stripping, tinning and connectors, plus bobbin, core or shielding assembly where required.
Sample and Batch Checks
Agree on the dimensions, inductance, DC resistance and any inspection records required for your part.
ABOUT JHCOILS
Coil Manufacturing in Dongguan
JHCOILS supports engineering and procurement teams sourcing custom wound parts.
We manufacture air-core windings, bobbin coils and assemblies with leads or magnetic cores. Share how the coil mounts and connects so we can review the winding and assembly together.
About JHCOILSOEM ORDER PROCESS
How to Order a Custom Coil
Work from the information you have, then confirm the sample before production.
Send Your Requirements
Share a drawing, sample or sketch, electrical targets and estimated quantities.
Confirm the Scope and Quote
Agree on materials, tooling, sample timing and inspection requirements.
Review the Sample
Check fit and function in your assembly, then approve the drawing revision and test limits.
Release Production
Confirm the order and packaging. Use the approved sample and inspection criteria as the production reference.
BEFORE PRODUCTION
Sample Approval and Coil Testing
Check the sample in your assembly and agree on what to measure before releasing the production order.
See how we inspect coils
Compare the sample with your drawing. Check mounting fit, winding height and lead exit in the actual assembly before approving the part.
Check Fit on a Physical Sample
Agree on inductance and DC resistance limits, test frequency, and which readings to record. For wireless charging designs, discuss temperature checks under the intended operating conditions.
Set the Electrical Test Limits
COIL SAMPLE GALLERY
Coil Samples and Tooling Examples
Compare winding profiles, lead connections and assemblies from the JHCOILS product range.
125 kHz RFID Coil with Leads
An example of a wound RFID antenna with lead wires for connection to the device.
Wireless Charging Receiver Coil
A receiver winding for review of package size and integration with the charging assembly.
Voice Coil Winding
A wound coil example for audio and voice-coil applications.
Linear Motor Coil Assembly
An assembly example for reviewing winding geometry, orientation and integration.
Self-Supported Coil Tooling
A tooling example for a winding that must hold its shape and fit the assembly.
Magnetic Coil Sample
A sample from our magnetic coil range for projects requiring a custom winding or core assembly.
What should I send for a quote?
Send a drawing or sample, coil dimensions, target inductance and DC resistance, expected quantities and your target date. If specified, include round wire diameter or flat wire width and thickness.
Can you review a project without a finished drawing?
Yes. Share a sample, sketch or the design inputs you have. We can identify the measurements and requirements to clarify before quoting.
Can I review a sample before ordering a production batch?
Yes. Discuss the sample quantity, tooling and timing when you request your quote. Check the sample in your assembly before approving production.
What can be measured or inspected?
Typical checks include dimensions, appearance, inductance and DC resistance. Agree on the test conditions, tolerances and any inspection documents for your part.
What determines MOQ and lead time?
They depend on material availability, winding and tooling complexity, order quantity and inspection scope. Share your expected volumes and schedule so we can review both.
Request a Coil Quote
ENGINEERING RESOURCES
Coil Design and Sourcing Guides
What to Define for Custom Coil Winding
Review geometry, wire, assembly and the test requirements to include when asking for a quote.
How to Plan Coil Quality Checks
See how incoming, in-process and final checks fit into the coil production workflow.
Wireless Charging Coil Calculator
Explore a first-pass estimate for a transmitter or receiver coil before validating the full system.
CUSTOM COIL RFQ
Discuss Your Coil Project
Send the specs you have. We’ll confirm what’s needed to quote.
Request a Coil Quote