Transmitting Coil: Power Rating 3.3-22 kW, Air Gap 100-250 mm

Q: What is the typical efficiency of automotive transmitting coils?

Modern automotive transmitting coils achieve 90-95% efficiency in optimal alignment conditions, with system efficiency (including electronics) typically 85-92% for SAE J2954 compliant systems.

Q: How does misalignment affect transmitting coil performance?

Lateral misalignment reduces coupling coefficient and transfer efficiency. Most systems tolerate 75-100 mm lateral misalignment with efficiency drops of 5-15%. Advanced systems use multiple coil arrays or movable coils to maintain alignment.

Q: What safety features are incorporated in transmitting coils?

Foreign object detection (FOD), living object protection (LOP), temperature monitoring, ground fault detection, and electromagnetic field shielding to ensure compliance with ICNIRP guidelines for human exposure.

Component Specifications

Definition

A precisely engineered inductive coil component in automotive wireless power transfer systems that generates an alternating electromagnetic field when energized with high-frequency AC current. This component is typically embedded in charging pads or ground-based infrastructure and operates at frequencies between 85-205 kHz for automotive applications, converting electrical energy into magnetic flux that couples with a receiving coil to enable contactless power transfer to electric vehicle batteries.

Working Principle

Operates on Faraday's law of electromagnetic induction. When alternating current flows through the transmitting coil's windings, it generates a time-varying magnetic field. This magnetic field induces an electromotive force (EMF) in the receiving coil through mutual inductance, enabling wireless power transfer across an air gap. The system typically uses resonant inductive coupling to improve efficiency and power transfer distance.

Materials

Litz wire (multiple individually insulated strands) for reduced skin effect, ferrite core material (Mn-Zn or Ni-Zn) for magnetic flux guidance and shielding, polyimide or epoxy insulation, aluminum or copper shielding layers, and high-temperature plastic housing (PPS, PEEK, or LCP).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Air Gap	100-250 mm
Q Factor	>100
Inductance	10-100 μH
Power Rating	3.3-22 kW
DC Resistance	<100 mΩ
Resonant Frequency	85-205 kHz
Coupling Coefficient	0.1-0.3
Operating Temperature	-40°C to 125°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 19363, ISO 15118, SAE J2954, IEC 61980, DIN EN 61851

Parent Products

This component is used in the following industrial products

Automotive Wireless Power Transfer System

The Automotive Wireless Power Transfer System is an integrated solution for contactless charging of electric vehicles.

View Product Details

Engineering Analysis

Risks & Mitigation

Electromagnetic interference with vehicle electronics
Overheating during high-power transfer
Foreign object heating
Moisture ingress in outdoor applications
Mechanical damage from vehicle impact

FMEA Triads

Trigger: Insulation breakdown due to thermal cycling
Failure: Short circuit between windings
Mitigation: Use high-temperature insulation materials (H-class), implement thermal monitoring, and design with thermal expansion compensation

Trigger: Ferrite core cracking from mechanical stress
Failure: Reduced magnetic coupling and efficiency
Mitigation: Use flexible bonding materials, design stress-relief features, and implement shock-absorbing mounting

Trigger: Corrosion of copper windings in harsh environments
Failure: Increased resistance and overheating
Mitigation: Apply conformal coatings, use tinned copper wire, and ensure proper sealing against moisture ingress

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% inductance tolerance, ±2% resonant frequency tolerance, positional alignment tolerance ±75 mm lateral, ±25 mm vertical

Test Method

SAE J2954 interoperability testing, ISO 19363 efficiency measurement, IEC 61980-1 safety testing, EMC testing per CISPR 25, thermal cycling per ISO 16750

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

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Supplier transparency

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Manufacturers of Transmitting Coil

Manufacturer profiles associated with Transmitting Coil.

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Frequently Asked Questions

What is the typical efficiency of automotive transmitting coils?