Air core coil WL9452

powerDChigh-frequency

Product overview
Wireless power transfer coil enabling contactless transfer of electrical energy between compatible devices by electromagnetic coupling across an air gap. Designed for sealed housings, contactless charging and applications where exposed connectors are undesirable. Configurable as transmitter, receiver, coupling or multi-coil assemblies and customizable for power, frequency, dimensions and installation environment.

How it works

• Step 1 – Power in: DC input is converted to high-frequency AC by an electronic driver.
• Step 2 – Creation of magnetic field: The transmitter coil driven by AC current generates an oscillating magnetic field.
• Step 3 – Magnetic coupling: The field crosses the air gap and couples to the receiving coil.
• Step 4 – Electrical energy generation: The receiving coil converts the changing magnetic field into AC voltage.
• Step 5 – Rectification: A rectifier converts the received AC into DC power.
• Step 6 – Voltage regulation: Control circuitry regulates voltage and current to the load or battery.

Main features

• Customizable electrical performance: inductance, DC resistance, Q factor, operating frequency and power rating can be specified.
• Compact design and flexible installation: coil diameter, thickness, number of turns and wire gauge configurable to application constraints.
• Optional magnetic shielding or mechanical supports to manage stray fields and enable integration with sensitive electronics.
• Multi-coil configurations, including 3-coil systems, to improve alignment tolerance or optimize coupling.
• Designed for consistent electrical and thermal performance with proper materials and winding processes to support long-term reliability.

Applications

• Industrial equipment: sealed sensors, monitoring devices and control modules that require contactless power transfer.
• Robotics and automation: charging for robots, AGVs and automated equipment to enable automated energy replenishment.
• Embedded OEM solutions: integrated battery charging in products where connectors are impractical.
• IoT and low-power sensors where wired charging or battery replacement is problematic.
• Medical electronics: contactless power for sealed medical devices and instrumentation.
• Consumer and smart devices where contactless charging is required (smartphones, wearables, earbuds).

Troubleshooting & design considerations

• Check alignment, air gap, coil inductance, operating frequency and input power if output power or efficiency is low.
• Inspect coil resistance, winding quality and nearby conductive materials when overheating occurs.
• Verify resonance matching and stability between transmitter and receiver if charging is unstable.
• Consider shielding, coil geometry, Q factor and thermal behavior early in the design phase.
• Validate coil performance inside the final housing and test under realistic assembly and alignment conditions.

Technical specifications

• Brand: Weilong Technology
• Model Number: WL9452
• Product Size: 94×52×3.0 mm; 9 TS; 8.6 UH
• Rated Power: 15 W or 20 W
• Wire: 0.08 mm × 9 TS
• Inductance / DCR: 28.5 UH ±10%
• Holding Force / Non-excitation Holding Force: Nil / 0
• Reset Time: Nil
• Service Life: Nil
• Certification: CE, RoHS, ISO9001
• Material: copper wire
• Power Contact: lead wire
• Install Style: adhered tape
• Tolerance of Dimension: ±0.1 mm
• Water-proof: None
• Insulation Class: F
• Hi-Pot Test: AC 600V 50/60Hz 2s
• Working Temperature: -10°C to 100°C
• Duty Cycle: 1-100%
• Thread Depth: 0.1 mm
• Payment Term: TT, or LC at Sight
• Sample Order: Yes
• Warranty: 1 Year
• MOQ: 1000 pcs
• Supply Ability: 5000 pcs per week
• Delivery Time: 30 Days
• Port of Loading: Shenzhen