Eddy Current Sensors

Faraday’s Law:
Any change in the environment of a coil of wire will cause a voltage to be induced in the coil, regardless of how the magnetic change is produced.

We force changes in a coil through oscillations which in turn create an oscillating magnetic field which generates Eddy currents on the surface of metal targets. As the volume of the flag changes, resistance to change by Eddy currents cause a change in coil impedance which in turn causes a change in frequency.

Our sensors are immune to magnetic or electromagnetic fields and do not require the use of permanent magnets. Due to this the sensor does not attract any metal debris through its lifetime.

Watch our Eddy Current Technology Video

MEASUREMENT VERSATILITY

Axial / Gap

Limited Movement with every high accuracy
Typical Applications: Transmission

Geometry

Long travel, immunity to vibration and to tolerances
Typical Applications: Transmission

Linear / Rotation

Large rotation / travel
Typical Applications: e-Valves, Engine, Transmission, Smart Actuators, Suspension

Rotary

Large rotation with high immunity to vibrations
Typical Applications: Clutch, Brake, Accelerator Pedals

PCB PLANAR COILS

The Coil wire-wound for analogue sensing, planar for digital sensing.
Planar (PCB) coils are much more cost effective, custom per application and have a smaller part to part variation.

SENSING PRINCIPLE

The Flag (Metal target) is where the eddy current losses are generated.
This can be either part of the customer’s system (shaft, gear, valve…) or it can be custom designed to fit within the customer’s product or within our product. Flags can be insert-moulded or metal injection moulded.