Optimized selection of inductive sensors in the automotive industry

Discussion on the characteristics of inductive sensors

No one is unfamiliar with inductive sensors. It is a common way to locate metal objects at close range. Because the detection is mainly done through the Hall effect, it is also called a Hall sensor.

The internal structure is composed of two parts: the front end is composed of an iron core wound with a transmitting and receiving coil; the rear end is a circuit part, and the whole is encapsulated in a plastic or metal casing. During operation, an alternating magnetic field occurs in the electromagnet core part, which produces an eddy current effect on the surface of the close metal object, thereby weakening the LC oscillation circuit. The amplification circuit part analyzes the weak LC oscillation circuit change of the electromagnet core receiving coil and gives a corresponding output.

For different outline sizes, the rated detection distance is generally up to 100mm. Under normal conditions, each manufacturer's nominal detection distance is the rated detection distance measured under laboratory conditions. In practical application, considering the environmental factors in various aspects, the reliable detection distance is about 80% of the rated detection distance, but there are certain requirements for the measured object. Due to the magnetic permeability and size of the material to be tested at the application site, in general, the requirements of the standard test object cannot be met, then the detection distance of the sensor will be further attenuated, which is why many users feel that the detection distance of the inductive sensor is more The reason for the much smaller nominal. In the case of such non-standard testing, there are large differences between manufacturers and their different series of products. In addition, more in-depth, there are differences in electromagnetic interference resistance, ambient temperature, voltage disturbance and installation requirements.

Choosing the right sensor will greatly improve the stability and reliability of the equipment operation, and also maximize the possibility of reducing the failure or damage of the sensor and reducing unnecessary maintenance investment. In the production process of the automobile manufacturing industry, inductive sensors are widely used as positioning detection. How to choose the most suitable product for this industry is particularly important.

Requirements of the stable operation of automobile production line for inductive sensors

With the increasing demand for automobiles in the Chinese market and the requirements for vehicle performance. Automobile manufacturers have higher standards for their production lines in new projects. On the one hand, it is necessary to meet the requirements of the automobile manufacturing process; furthermore, it is necessary to ensure the stable and smooth operation of the entire line and minimize the time for maintenance and commissioning to ensure higher production efficiency.