An inductive speed sensor is a non-contact measuring method for the continuous detection of speeds. The measuring technique is based on the principle of electromagnetic induction. This means that an electric field is created when the magnetic flux density changes. For example, when a magnet moves up and down or rotates at a certain speed, an electrical voltage is induced in the coil. This can be measured at the terminals of the coil and allows conclusions to be drawn about the type and speed of the movement.
The principle of voltage induction is of great importance for applications in mechanical engineering, electrical engineering or information technology. In contrast to other measuring methods, the inductive speed sensor offers the possibility of recording rotary movements without contact and thus without wear. The measured quantity is therefore not influenced in any way by the method.
Inductive speed sensors and their fields of application
Inductive speed sensors are used today in many different areas of application:
The advantages of inductive speed sensors are to be explained using the example of the crankshaft sensor. In motor vehicles, the crankshaft is responsible for converting the translatory motion of the pistons into a rotary motion. In order to detect this rotational speed - which is equivalent to the engine speed - coils are usually used. These are wound around the soft iron core of a permanent magnet. If a gear rim is now attached to the rotating flywheel, the inductive speed sensor can determine the speed on the basis of the resulting magnetic pulses. The method is very reliable and precise, which is why it is used not only in automotive engineering but also in many other areas.
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