Variationssensoren

Variationssensoren, also known as variable reluctance sensors, are a type of sensor that detects changes in magnetic flux. They are commonly used in automotive applications for tasks such as detecting the speed of rotating components like crankshafts and camshafts. A variationssensor typically consists of a permanent magnet, a ferromagnetic core, and a coil of wire. As a ferromagnetic object, such as a toothed wheel, moves past the sensor, it alters the magnetic field. This change in magnetic flux induces a voltage in the coil. The magnitude and polarity of the induced voltage depend on the speed and direction of the movement. The output signal is an alternating voltage that can be processed by electronic control units. The simplicity and robustness of variationssensoren make them suitable for harsh environments. They are contactless sensors, meaning they do not require physical contact with the object being measured, which contributes to their long lifespan. Variationssensoren are also relatively inexpensive to manufacture. Their primary limitation is their sensitivity to external magnetic fields and their dependence on the motion of ferromagnetic materials.