Wiki article · Collection 03

Coil Testing and Measurement

Engineering reference on Coil Testing and Measurement for wireless power system design, integration, and deployment.

6 minArticle 46/50Coil Design

Coil Testing and Measurement — educational diagram — Fig.: Educational diagram for “Coil Testing and Measurement”.

Coil testing verifies that magnetics match design before integration into pads and vehicles. Minimum production tests usually include inductance and resistance at operating frequency; qualification adds coupling maps, thermal soak, Hi-Pot, and vibration.

Fixtures must reproduce production mounting — a coil held in air by clips measures different L than when bolted to the ferrite plate.

01Core measurements

L and Rac at f_op with defined drive level.
Self-resonant frequency (SRF) if relevant to EMI guards.
Q derived from L and Rac or direct network analyzer Q.
Hi-Pot coil-to-shield and coil-to-core.

Coil Testing and Measurement — supporting diagram — Fig.: Supporting illustration for “Coil Testing and Measurement”.

02System-level tests

Pair TX and RX on alignment stage; measure power vs position at rated inverter settings. Include misalignment stops defined in spec. Store golden traces for serial-number traceability.

03Pass/fail philosophy

Tight Rac control matters as much as L for thermal parity across fleet.
Reject outliers even inside L tolerance if Q is low.
NCR review for patterns (winding machine drift, ferrite lot).