Magnetic Core
Flat magnetic materials with high permeability are used to direct electromagnetic flux in low-profile electronic components. Incorporating a planar ferrite improves the coupling efficiency of printed circuit board coils in industrial sensors. This core material provides a low-reluctance path for the magnetic field.
Flux Concentration
Magnetic fields are guided through the high-permeability material to prevent electromagnetic interference with surrounding circuitry. This guiding action increases the inductance of the sensor coil for a given number of turns. It also reduces the leakage flux that would otherwise escape into the environment.
Core Design
Manufacturing processes mold the magnetic material into flat plates or low-profile shapes that fit directly over or under the circuit traces. These shapes must be matched to the coil geometry to optimize the magnetic path and minimize air gaps. The material composition is selected to provide high permeability while maintaining low core losses at the sensor operating frequency.
Mechanical stability of the core is achieved by using specialized adhesives that withstand thermal cycling without cracking.
Power Rating
Saturation limits of the core material determine the maximum current that the sensor coil can carry without distorting the signal. Exceeding this limit causes a sharp drop in inductance and introduces measurement errors. System designers monitor the operating current to ensure that the core remains within its linear region.
